diff --git a/.gitignore b/.gitignore
index aebe00aa..464c9db8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 
 *.komodoproject
+node_modules/
diff --git a/README.md b/README.md
index 27a6075a..8c1b07ef 100644
--- a/README.md
+++ b/README.md
@@ -1,11 +1,81 @@
 JS-Interpreter
 ==============
 
-A sandboxed JavaScript interpreter in JavaScript.  Execute arbitrary JavaScript
-code line by line in isolation and safety.
+A sandboxed JavaScript interpreter written in TypeScript, packed with `Webpack` or `tsc` for use with Node.js or within a browser (either loaded [statically](https://junkato.jp/JS-Interpreter/) or [dynamically](https://junkato.jp/JS-Interpreter/?required)). Execute arbitrary JavaScript code line by line in isolation and safety.
+
+This interpreter is a TypeScript port of [the original JavaScript version](https://github.com/NeilFraser/JS-Interpreter).
+
+There are several library files that serve different use cases. See below for more concrete instructions.
+
+- `dist/interpreter.js` ... packed with `tsc` (`npm run build`) and can be loaded from Node.js or a browser with RequireJS. `acorn` needs to be loaded separately.
+- `dist/interpreter.d.ts` ... TypeScript type definition
+- `dist/acorn_interpreter.js` ... packed with `Webpack` (`npm run build-with-acorn`) as a library and  can be loaded with a `<script>` tag from a browser. `acorn` is bundled.
+- `dist/interpreter.global.js` ... packed with `Webpack` (`npm run build-global`) as a library and can be loaded with a `<script>` tag from a browser. `acorn` needs to be loaded separately.
 
 Live demo:
-https://neil.fraser.name/software/JS-Interpreter/
+[https://junkato.jp/JS-Interpreter](https://junkato.jp/JS-Interpreter)
+
+More demos:
+[https://junkato.jp/JS-Interpreter/demos](https://junkato.jp/JS-Interpreter/demos)
 
 Documentation:
-https://neil.fraser.name/software/JS-Interpreter/docs.html
+This `README` file ... or the original documentation at 
+[https://neil.fraser.name/software/JS-Interpreter/docs.html](https://neil.fraser.name/software/JS-Interpreter/docs.html)
+
+## Node.js Basic Usage
+
+`npm install` to install the latest code.
+
+```sh
+npm install acorn https://github.com/arcatdmz/JS-Interpreter --save
+npm install @types/acorn --save-dev
+```
+
+Write typed code with perfect auto completion!
+
+```typescript
+import acorn = require('acorn');
+import Interpreter = require('JS-Interpreter');
+Interpreter.acorn = acorn;
+
+// Test the interpreter.
+var interpreter = new Interpreter("var a = 1, b = 2; a + b;");
+interpreter.run();
+console.log('1 + 2 = ' + interpreter.value);
+// shows '1 + 2 = 3' in the console
+```
+
+## Browser Basic Usage
+
+Load `dist/acorn_interpreter.js` statically and use the globally-declared `Interpreter` class.
+
+```html
+<script src="https://cdn.rawgit.com/arcatdmz/JS-Interpreter/39cbd828/dist/acorn_interpreter.js"></script>
+<script>
+var interpreter = new Interpreter("var a = 1, b = 2; a + b;");
+interpreter.run();
+alert('1 + 2 = ' + interpreter.value);
+// shows an alert '1 + 2 = 3'
+</script>
+```
+
+## Dynamic loading with RequireJS
+
+Load `dist/acorn.js` and `dist/interpreter.js` dynamically with [RequireJS](//requirejs.org) and use the `Interpreter` class.
+No global scope pollution!
+
+```html
+<script src="https://cdn.rawgit.com/arcatdmz/JS-Interpreter/39cbd828/lib/require.js"></script>
+<script>
+requirejs(['https://cdn.rawgit.com/arcatdmz/JS-Interpreter/39cbd828/lib/acorn.js', 'https://cdn.rawgit.com/arcatdmz/JS-Interpreter/39cbd828/dist/interpreter.js'], function (acorn, Interpreter) {
+  Interpreter.acorn = acorn; // Manually pass acorn runtime to the Interpreter
+  var interpreter = new Interpreter("var a = 1, b = 2; a + b;");
+  interpreter.run();
+  alert('1 + 2 = ' + interpreter.value);
+  // shows an alert '1 + 2 = 3'
+});
+</script>
+```
+
+--------------
+(c) 2013-2017 Google Inc. and [Jun Kato](https://junkato.jp)
diff --git a/acorn_interpreter.js b/acorn_interpreter.js
deleted file mode 100644
index d9c24a21..00000000
--- a/acorn_interpreter.js
+++ /dev/null
@@ -1,134 +0,0 @@
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-na=/[\n\r\u2028\u2029]/,Y=/\r\n|[\n\r\u2028\u2029]/g,la=a.isIdentifierStart=function(a){return 65>a?36===a:91>a?!0:97>a?95===a:123>a?!0:170<=a&&Za.test(String.fromCharCode(a))},ab=a.isIdentifierChar=function(a){return 48>a?36===a:58>a?!0:65>a?!1:91>a?!0:97>a?95===a:123>a?!0:170<=a&&Pb.test(String.fromCharCode(a))},ca,Ia={kind:"loop"},Ob={kind:"switch"}};
-"object"==typeof exports&&"object"==typeof module?mod$$inline_58(exports):"function"==typeof define&&define.amd?define(["exports"],mod$$inline_58):mod$$inline_58(this.acorn||(this.acorn={}));
-// JS-Interpreter: Copyright 2013 Google Inc, Apache 2.0
-var g;
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-a)))return Z(this,d,b.W,a);b.ua=void 0;b.Ha=!1;b.N=!1;if(c.body)return new p(c.body,b.scope)};h.prototype.stepForStatement=function(a,b,c){var d=b.T||0;if(0===d){if(b.T=1,c.init)return new p(c.init,b.scope)}else if(1===d){if(b.T=2,c.test)return new p(c.test,b.scope)}else if(2===d)if(b.T=3,c.test&&!b.value)a.pop();else return b.ka=!0,new p(c.body,b.scope);else if(3===d&&(b.T=1,c.update))return new p(c.update,b.scope)};h.prototype.stepFunctionDeclaration=function(a){a.pop()};
-h.prototype.stepFunctionExpression=function(a,b,c){a.pop();a[a.length-1].value=P(this,c,b.scope)};h.prototype.stepIdentifier=function(a,b,c){a.pop();if(b.Z)a[a.length-1].value=[z,c.name];else{var d=T(this,c.name);if(d&&"object"===typeof d&&d.J){d.J=!1;for(a=b.scope;!Q(this,a,c.name);)a=a.U;return Y(this,d,this.global)}a[a.length-1].value=d}};h.prototype.stepIfStatement=h.prototype.stepConditionalExpression;
-h.prototype.stepLabeledStatement=function(a,b,c){a.pop();a=b.labels||[];a.push(c.label.name);b=new p(c.body,b.scope);b.labels=a;return b};h.prototype.stepLiteral=function(a,b,c){a.pop();b=c.value;b instanceof RegExp&&(c=this.c(this.ra),N(this,c,b),b=c);a[a.length-1].value=b};
-h.prototype.stepLogicalExpression=function(a,b,c){if("&&"!==c.operator&&"||"!==c.operator)throw SyntaxError("Unknown logical operator: "+c.operator);if(!b.P)return b.P=!0,new p(c.left,b.scope);if(b.ja)a.pop(),a[a.length-1].value=b.value;else if("&&"===c.operator&&!b.value||"||"===c.operator&&b.value)a.pop(),a[a.length-1].value=b.value;else return b.ja=!0,new p(c.right,b.scope)};
-h.prototype.stepMemberExpression=function(a,b,c){if(!b.ia)return b.ia=!0,new p(c.object,b.scope);if(c.computed)if(b.Xa)c=b.value;else return b.h=b.value,b.Xa=!0,new p(c.property,b.scope);else b.h=b.value,c=c.property.name;a.pop();if(b.Z)a[a.length-1].value=[b.h,c];else{if((c=this.m(b.h,c))&&"object"===typeof c&&c.J)return c.J=!1,Y(this,c,b.h);a[a.length-1].value=c}};h.prototype.stepNewExpression=h.prototype.stepCallExpression;
-h.prototype.stepObjectExpression=function(a,b,c){var d=b.i||0,e=c.properties[d];if(b.h){var f=e.key;if("Identifier"===f.type)var m=f.name;else if("Literal"===f.type)m=f.value;else throw SyntaxError("Unknown object structure: "+f.type);b.qa[m]||(b.qa[m]={});b.qa[m][e.kind]=b.value;b.i=++d;e=c.properties[d]}else b.h=this.c(this.F),b.qa=Object.create(null);if(e)return new p(e.value,b.scope);for(f in b.qa)c=b.qa[f],"get"in c||"set"in c?this.setProperty(b.h,f,null,{configurable:!0,enumerable:!0,get:c.get,
-set:c.set}):this.setProperty(b.h,f,c.init);a.pop();a[a.length-1].value=b.h};h.prototype.stepProgram=function(a,b,c){a=b.i||0;if(c=c.body[a])return b.done=!1,b.i=a+1,new p(c,b.scope);b.done=!0};
-h.prototype.stepReturnStatement=function(a,b,c){if(c.argument&&!b.L)return b.L=!0,new p(c.argument,b.scope);c=b.value;var d=a.length-1;for(b=a[d];"CallExpression"!==b.node.type&&"NewExpression"!==b.node.type;){"TryStatement"!==b.node.type&&a.splice(d,1);d--;if(0>d)throw SyntaxError("Illegal return statement");b=a[d]}b.value=c};h.prototype.stepSequenceExpression=function(a,b,c){var d=b.i||0;if(c=c.expressions[d])return b.i=d+1,new p(c,b.scope);a.pop();a[a.length-1].value=b.value};
-h.prototype.stepSwitchStatement=function(a,b,c){if(!b.O)return b.O=1,new p(c.discriminant,b.scope);1===b.O&&(b.O=2,b.Za=b.value);for(;;){var d=b.za||0,e=c.cases[d];if(b.na||!e||e.test)if(e||b.na||!b.Ga)if(e){if(!b.na&&!a.Oa&&e.test)return a.Oa=!0,new p(e.test,b.scope);if(b.na||b.value===b.Za){b.na=!0;var f=b.i||0;if(e.consequent[f])return b.Ya=!0,b.i=f+1,new p(e.consequent[f],b.scope)}a.Oa=!1;b.i=0;b.za=d+1}else{a.pop();break}else b.na=!0,b.za=b.Ga;else b.Ga=d,b.za=d+1}};
-h.prototype.stepThisExpression=function(a){a.pop();a[a.length-1].value=T(this,"this")};h.prototype.stepThrowStatement=function(a,b,c){if(b.L)F(this,b.value);else return b.L=!0,new p(c.argument,b.scope)};h.prototype.stepTryStatement=function(a,b,c){if(!b.Sa)return b.Sa=!0,new p(c.block,b.scope);if(b.V&&!b.Va&&c.handler)return b.Va=!0,a=new p(c.handler,b.scope),a.V=b.V,b.V=null,a;if(!b.Ua&&c.finalizer)return b.Ua=!0,new p(c.finalizer,b.scope);b.V?X(this,b.V):a.pop()};
-h.prototype.stepUnaryExpression=function(a,b,c){if(!b.L)return b.L=!0,a=new p(c.argument,b.scope),a.Z="delete"===c.operator,a;a.pop();var d=b.value;if("-"===c.operator)d=-d;else if("+"===c.operator)d=+d;else if("!"===c.operator)d=!d;else if("~"===c.operator)d=~d;else if("delete"===c.operator){c=!0;if(Array.isArray(d)){var e=d[0];e===z&&(e=b.scope);d=String(d[1]);try{delete e.a[d]}catch(f){b.scope.C?F(this,this.f,"Cannot delete property '"+d+"' of '"+e+"'"):c=!1}}d=c}else if("typeof"===c.operator)d=
-d&&"Function"===d.B?"function":typeof d;else if("void"===c.operator)d=void 0;else throw SyntaxError("Unknown unary operator: "+c.operator);a[a.length-1].value=d};
-h.prototype.stepUpdateExpression=function(a,b,c){if(!b.P)return b.P=!0,a=new p(c.argument,b.scope),a.Z=!0,a;b.ma||(b.ma=b.value);b.ha&&(b.S=b.value);if(!b.ha){var d=V(this,b.ma);if((b.S=d)&&"object"===typeof d&&d.J)return d.J=!1,b.ha=!0,Y(this,d,b.ma)}if(b.N)a.pop(),a[a.length-1].value=b.N;else{d=Number(b.S);if("++"===c.operator)var e=d+1;else if("--"===c.operator)e=d-1;else throw SyntaxError("Unknown update expression: "+c.operator);c=c.prefix?e:d;if(d=W(this,b.ma,e))return b.N=c,Z(this,d,b.ma,e);
-a.pop();a[a.length-1].value=c}};h.prototype.stepVariableDeclaration=function(a,b,c){c=c.declarations;var d=b.i||0,e=c[d];b.Ma&&e&&(U(this,e.id.name,b.value),b.Ma=!1,e=c[++d]);for(;e;){if(e.init)return b.i=d,b.Ma=!0,new p(e.init,b.scope);e=c[++d]}a.pop()};h.prototype.stepWithStatement=function(a,b,c){if(b.ia)if(b.Ta)a.pop();else return b.Ta=!0,a=R(this,b.scope,b.value),new p(c.body,a);else return b.ia=!0,new p(c.object,b.scope)};h.prototype.stepWhileStatement=h.prototype.stepDoWhileStatement;
-this.Interpreter=h;h.prototype.step=h.prototype.step;h.prototype.run=h.prototype.Na;h.prototype.appendCode=h.prototype.Qa;h.prototype.createObject=h.prototype.$;h.prototype.createObjectProto=h.prototype.c;h.prototype.createAsyncFunction=h.prototype.Ra;h.prototype.createNativeFunction=h.prototype.b;h.prototype.getProperty=h.prototype.m;h.prototype.setProperty=h.prototype.setProperty;h.prototype.nativeToPseudo=h.prototype.I;h.prototype.pseudoToNative=h.prototype.w;h.prototype.createPrimitive=function(a){return a};
diff --git a/demos/async.html b/demos/async.html
index e70fc8a4..202fe857 100644
--- a/demos/async.html
+++ b/demos/async.html
@@ -4,8 +4,8 @@
   <meta charset="utf-8">
   <title>JS-Interpreter Async Demo</title>
   <link href="style.css" rel="stylesheet" type="text/css">
-  <script src="../acorn.js"></script>
-  <script src="../interpreter.js"></script>
+  <script src="../lib/acorn.js"></script>
+  <script src="../dist/interpreter.global.js"></script>
   <script>
     var myInterpreter;
     function initAlert(interpreter, scope) {
diff --git a/demos/browser/index.html b/demos/browser/index.html
new file mode 100644
index 00000000..dcb9eee5
--- /dev/null
+++ b/demos/browser/index.html
@@ -0,0 +1,14 @@
+<!DOCTYPE html><html lang="en">
+  <head>
+    <meta charset="utf-8" />
+    <title>JS-Interpreter TypeScript demo page</title>
+    <link rev="made" href="mailto:i@junkato.jp" />
+    <link rel="stylesheet" href="//fonts.googleapis.com/css?family=Droid+Sans" />
+    <link href="//junkato.jp/css/bootstrap.min.css" rel="stylesheet">
+    <link href="//junkato.jp/css/main.css" rel="stylesheet">
+  </head>
+  <body>
+    <script>var require = { paths: { "acorn": "../../lib/acorn" } };</script>
+    <script src="../../lib/require.js" data-main="index.js"></script>
+  </body>
+</html>
\ No newline at end of file
diff --git a/demos/browser/index.js b/demos/browser/index.js
new file mode 100644
index 00000000..87c2e9ad
--- /dev/null
+++ b/demos/browser/index.js
@@ -0,0 +1,9 @@
+define(["require", "exports", "acorn", "../../dist/interpreter"], function (require, exports, acorn, Interpreter) {
+    "use strict";
+    Object.defineProperty(exports, "__esModule", { value: true });
+    Interpreter.acorn = acorn;
+    // Test the interpreter.
+    var interpreter = new Interpreter("var a = 1, b = 2; a + b;");
+    interpreter.run();
+    alert('1 + 2 = ' + interpreter.value); // shows an alert '1 + 2 = 3'
+});
diff --git a/demos/browser/index.ts b/demos/browser/index.ts
new file mode 100644
index 00000000..4688e08e
--- /dev/null
+++ b/demos/browser/index.ts
@@ -0,0 +1,9 @@
+
+import acorn = require('acorn');
+import Interpreter = require('../../dist/interpreter');
+Interpreter.acorn = acorn;
+
+// Test the interpreter.
+var interpreter = new Interpreter("var a = 1, b = 2; a + b;");
+interpreter.run();
+alert('1 + 2 = ' + interpreter.value); // shows an alert '1 + 2 = 3'
diff --git a/demos/json.html b/demos/json.html
index c513e18a..679bec5a 100644
--- a/demos/json.html
+++ b/demos/json.html
@@ -4,8 +4,8 @@
   <meta charset="utf-8">
   <title>JS-Interpreter JSON Demo</title>
   <link href="style.css" rel="stylesheet" type="text/css">
-  <script src="../acorn.js"></script>
-  <script src="../interpreter.js"></script>
+  <script src="../lib/acorn.js"></script>
+  <script src="../dist/interpreter.js"></script>
   <script>
     var myInterpreter;
     function initAlert(interpreter, scope) {
diff --git a/demos/nodejs/index.js b/demos/nodejs/index.js
new file mode 100644
index 00000000..f2b23bd9
--- /dev/null
+++ b/demos/nodejs/index.js
@@ -0,0 +1,9 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+var acorn = require("acorn");
+var Interpreter = require("JS-Interpreter");
+Interpreter.acorn = acorn;
+// Test the interpreter.
+var interpreter = new Interpreter("var a = 1, b = 2; a + b;");
+interpreter.run();
+console.log('1 + 2 = ' + interpreter.value); // shows '1 + 2 = 3' in the console
diff --git a/demos/nodejs/index.ts b/demos/nodejs/index.ts
new file mode 100644
index 00000000..98f4b51a
--- /dev/null
+++ b/demos/nodejs/index.ts
@@ -0,0 +1,9 @@
+
+import acorn = require('acorn');
+import Interpreter = require('JS-Interpreter');
+Interpreter.acorn = acorn;
+
+// Test the interpreter.
+var interpreter = new Interpreter("var a = 1, b = 2; a + b;");
+interpreter.run();
+console.log('1 + 2 = ' + interpreter.value); // shows '1 + 2 = 3' in the console
diff --git a/demos/nodejs/package-lock.json b/demos/nodejs/package-lock.json
new file mode 100644
index 00000000..eeced665
--- /dev/null
+++ b/demos/nodejs/package-lock.json
@@ -0,0 +1,39 @@
+{
+  "name": "js-interpreter-demo-nodejs",
+  "version": "1.0.0",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
+    "@types/acorn": {
+      "version": "4.0.2",
+      "resolved": "https://registry.npmjs.org/@types/acorn/-/acorn-4.0.2.tgz",
+      "integrity": "sha1-XDfa3oV6U8FCWMkU1D5jQHauw/0=",
+      "dev": true,
+      "requires": {
+        "@types/estree": "0.0.37"
+      }
+    },
+    "@types/estree": {
+      "version": "0.0.37",
+      "resolved": "https://registry.npmjs.org/@types/estree/-/estree-0.0.37.tgz",
+      "integrity": "sha512-1IT6vNpmU9w18P3v6mN9idv18z5KPVTi4t7+rU9VLnkxo0LCam8IXy/eSVzOaQ1Wpabra2cN3A8K/SliPK/Suw=="
+    },
+    "@types/node": {
+      "version": "8.0.20",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-8.0.20.tgz",
+      "integrity": "sha512-MnB7YEpmLUyEWRVRhKpRs4swwqITnY8BcVFPoTuCl99SCplI/lLUiU5vcJ/OANDqwkpdIg0pDEM38K22KQT2RA==",
+      "dev": true
+    },
+    "acorn": {
+      "version": "0.4.2",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-0.4.2.tgz",
+      "integrity": "sha1-x5qMEumP5sWmAPKAcCMtTt4wiw4="
+    },
+    "JS-Interpreter": {
+      "version": "git+https://github.com/arcatdmz/JS-Interpreter.git#39cbd828eb71b6e80745e60ad9f23f46f9eb4d7b",
+      "requires": {
+        "@types/estree": "0.0.37"
+      }
+    }
+  }
+}
diff --git a/demos/nodejs/package.json b/demos/nodejs/package.json
new file mode 100644
index 00000000..6904bfc6
--- /dev/null
+++ b/demos/nodejs/package.json
@@ -0,0 +1,19 @@
+{
+  "name": "js-interpreter-demo-nodejs",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "build": "tsc index.ts --typeRoots ./node_modules/@types"
+  },
+  "author": "Jun Kato <i@junkato.jp> (https://junkato.jp)",
+  "license": "ISC",
+  "devDependencies": {
+    "@types/acorn": "^4.0.2",
+    "@types/node": "^8.0.20"
+  },
+  "dependencies": {
+    "acorn": "^0.4.2",
+    "JS-Interpreter": "git+https://github.com/arcatdmz/JS-Interpreter.git"
+  }
+}
diff --git a/demos/serialize.html b/demos/serialize.html
index 4ba9d629..829a5404 100644
--- a/demos/serialize.html
+++ b/demos/serialize.html
@@ -4,8 +4,8 @@
   <meta charset="utf-8">
   <title>JS-Interpreter Serialization Demo</title>
   <link href="style.css" rel="stylesheet" type="text/css">
-  <script src="../acorn.js"></script>
-  <script src="../interpreter.js"></script>
+  <script src="../lib/acorn.js"></script>
+  <script src="../dist/interpreter.global.js"></script>
   <script src="serialize.js"></script>
   <script>
     var myInterpreter;
diff --git a/demos/thread.html b/demos/thread.html
index 3322f243..d356a6a4 100644
--- a/demos/thread.html
+++ b/demos/thread.html
@@ -4,8 +4,8 @@
   <meta charset="utf-8">
   <title>JS-Interpreter Thread Demo</title>
   <link href="style.css" rel="stylesheet" type="text/css">
-  <script src="../acorn.js"></script>
-  <script src="../interpreter.js"></script>
+  <script src="../lib/acorn.js"></script>
+  <script src="../dist/interpreter.js"></script>
   <script>
     function initAlert(interpreter, scope) {
       var wrapper = function(text) {
diff --git a/dist/acorn_interpreter.js b/dist/acorn_interpreter.js
new file mode 100644
index 00000000..e8a5254e
--- /dev/null
+++ b/dist/acorn_interpreter.js
@@ -0,0 +1,20 @@
+var Interpreter=function(t){function e(n){if(r[n])return r[n].exports;var o=r[n]={i:n,l:!1,exports:{}};return t[n].call(o.exports,o,o.exports,e),o.l=!0,o.exports}var r={};return e.m=t,e.c=r,e.d=function(t,r,n){e.o(t,r)||Object.defineProperty(t,r,{configurable:!1,enumerable:!0,get:n})},e.n=function(t){var r=t&&t.__esModule?function(){return t.default}:function(){return t};return e.d(r,"a",r),r},e.o=function(t,e){return Object.prototype.hasOwnProperty.call(t,e)},e.p="",e(e.s=0)}([function(t,e,r){t.exports=r(1)},function(t,e,r){var n,o;n=[r,e,r(2),r(4)],void 0!==(o=function(t,e,r,n){"use strict";/*!
+     * @license
+     * JavaScript Interpreter bundled with acorn v0.4.1
+     *
+     * Copyright 2013-2017 Google Inc. and Jun Kato
+     *
+     * Licensed under the Apache License, Version 2.0 (the "License");
+     * you may not use this file except in compliance with the License.
+     * You may obtain a copy of the License at
+     *
+     *   http://www.apache.org/licenses/LICENSE-2.0
+     *
+     * Unless required by applicable law or agreed to in writing, software
+     * distributed under the License is distributed on an "AS IS" BASIS,
+     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     * See the License for the specific language governing permissions and
+     * limitations under the License.
+     */
+return n.acorn=r,n}.apply(e,n))&&(t.exports=o)},function(t,e,r){"use strict";(function(t){var r,n,o,i="function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?function(t){return typeof t}:function(t){return t&&"function"==typeof Symbol&&t.constructor===Symbol&&t!==Symbol.prototype?"symbol":typeof t};!function(a,s){"object"==i(e)&&"object"==i(t)?s(e):(n=[e],r=s,void 0!==(o="function"==typeof r?r.apply(e,n):r)&&(t.exports=o))}(0,function(t){function e(t){lt=t||{};for(var e in dt)Object.prototype.hasOwnProperty.call(lt,e)||(lt[e]=dt[e]);yt=lt.sourceFile||null}function r(t,e){var r=vt(ht,t);e+=" ("+r.line+":"+r.column+")";var n=new SyntaxError(e);throw n.pos=t,n.loc=r,n.raisedAt=Et,n}function n(t){function e(t){if(1==t.length)return r+="return str === "+JSON.stringify(t[0])+";";r+="switch(str){";for(var e=0;e<t.length;++e)r+="case "+JSON.stringify(t[e])+":";r+="return true}return false;"}t=t.split(" ");var r="",n=[];t:for(var o=0;o<t.length;++o){for(var 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o=["getDate","getDay","getFullYear","getHours","getMilliseconds","getMinutes","getMonth","getSeconds","getTime","getTimezoneOffset","getUTCDate","getUTCDay","getUTCFullYear","getUTCHours","getUTCMilliseconds","getUTCMinutes","getUTCMonth","getUTCSeconds","getYear","setDate","setFullYear","setHours","setMilliseconds","setMinutes","setMonth","setSeconds","setTime","setUTCDate","setUTCFullYear","setUTCHours","setUTCMilliseconds","setUTCMinutes","setUTCMonth","setUTCSeconds","setYear","toDateString","toISOString","toJSON","toGMTString","toLocaleDateString","toLocaleString","toLocaleTimeString","toTimeString","toUTCString"],i=0;i<o.length;i++)r=function(t){return function(e){for(var r=[],o=0;o<arguments.length;o++)r[o]=n.pseudoToNative(arguments[o]);return this.data[t].apply(this.data,r)}}(o[i]),this.setNativeFunctionPrototype(this.DATE,o[i],r)},t.prototype.initRegExp=function(e){var r,n=this;r=function(t,e){if(n.calledWithNew())var r=this;else var 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this.NUMBER.properties.prototype;case"boolean":return this.BOOLEAN.properties.prototype;case"string":return this.STRING.properties.prototype}return t?t.proto:null},t.prototype.getProperty=function(e,r){if(r=String(r),void 0!==e&&null!==e||this.throwException(this.TYPE_ERROR,"Cannot read property '"+r+"' of "+e),"length"===r){if(this.isa(e,this.STRING))return String(e).length}else if(r.charCodeAt(0)<64&&this.isa(e,this.STRING)){var n=t.legalArrayIndex(r);if(!isNaN(n)&&n<String(e).length)return String(e)[n]}do{var o=e;if(o.properties&&r in o.properties){var i=o.getter[r];return i?(i.isGetter=!0,i):o.properties[r]}}while(e=this.getPrototype(e))},t.prototype.hasProperty=function(e,r){if(!e.isObject)throw TypeError("Primitive data type has no properties");if("length"===(r=String(r))&&this.isa(e,this.STRING))return!0;if(this.isa(e,this.STRING)){var n=t.legalArrayIndex(r);if(!isNaN(n)&&n<String(e).length)return!0}do{var o=e;if(o.properties&&r in o.properties)return!0}while(e=this.getPrototype(e));return!1},t.prototype.setProperty=function(e,r,n,o){r=String(r),void 0!==e&&null!==e||this.throwException(this.TYPE_ERROR,"Cannot set property '"+r+"' of "+e),o&&("get"in o||"set"in o)&&("value"in o||"writable"in o)&&this.throwException(this.TYPE_ERROR,"Invalid property descriptor. Cannot both specify accessors and a value or writable attribute");var i=!this.stateStack||this.getScope().strict;if(!e.isObject)return void(i&&this.throwException(this.TYPE_ERROR,"Can't create property '"+r+"' on '"+e+"'"));if(this.isa(e,this.STRING)){var a=t.legalArrayIndex(r);if("length"===r||!isNaN(a)&&a<String(e).length)return void(i&&this.throwException(this.TYPE_ERROR,"Cannot assign to read only property '"+r+"' of String '"+e.data+"'"))}if("Array"===e.class){var s,p=e.properties.length;if("length"===r){if(n=t.legalArrayLength(n),isNaN(n)&&this.throwException(this.RANGE_ERROR,"Invalid array length"),n<p)for(s in e.properties)s=t.legalArrayIndex(s),!isNaN(s)&&n<=s&&delete e.properties[s]}else isNaN(s=t.legalArrayIndex(r))||(e.properties.length=Math.max(p,s+1))}if(e.preventExtensions&&!(r in e.properties))return void(i&&this.throwException(this.TYPE_ERROR,"Can't add property '"+r+"', object is not extensible"));if(o){"get"in o&&(o.get?e.getter[r]=o.get:delete e.getter[r]),"set"in o&&(o.set?e.setter[r]=o.set:delete e.setter[r]);var c={};"configurable"in o&&(c.configurable=o.configurable),"enumerable"in o&&(c.enumerable=o.enumerable),"writable"in o&&(c.writable=o.writable,delete e.getter[r],delete e.setter[r]),"value"in o?(c.value=o.value,delete e.getter[r],delete e.setter[r]):n!==ReferenceError&&(c.value=n,delete e.getter[r],delete e.setter[r]);try{Object.defineProperty(e.properties,r,c)}catch(t){this.throwException(this.TYPE_ERROR,"Cannot redefine property: "+r)}}else{if(n===ReferenceError)throw ReferenceError("Value not specified.");for(var u=e;!(r in u.properties);)if(!(u=this.getPrototype(u))){u=e;break}if(u.setter&&u.setter[r])return u.setter[r];if(u.getter&&u.getter[r])i&&this.throwException(this.TYPE_ERROR,"Cannot set property '"+r+"' of object '"+e+"' which only has a getter");else try{e.properties[r]=n}catch(t){i&&this.throwException(this.TYPE_ERROR,"Cannot assign to read only property '"+r+"' of object '"+e+"'")}}},t.prototype.setNativeFunctionPrototype=function(e,r,n){this.setProperty(e.properties.prototype,r,this.createNativeFunction(n,!1),t.NONENUMERABLE_DESCRIPTOR)},t.prototype.getScope=function(){var t=this.stateStack[this.stateStack.length-1].scope;if(!t)throw Error("No scope found.");return t},t.prototype.createScope=function(t,e){var r=this.createObjectProto(null);if(r.parentScope=e,e||this.initGlobalScope(r),this.populateScope_(t,r),r.strict=!1,e&&e.strict)r.strict=!0;else{var n=t.body&&t.body[0];n&&n.expression&&"Literal"===n.expression.type&&"use strict"===n.expression.value&&(r.strict=!0)}return r},t.prototype.createSpecialScope=function(t,e){if(!t)throw Error("parentScope required");var r=e||this.createObjectProto(null);return r.parentScope=t,r.strict=t.strict,r},t.prototype.getValueFromScope=function(t){for(var e=this.getScope();e&&e!==this.global;){if(t in e.properties)return e.properties[t];e=e.parentScope}if(e===this.global&&this.hasProperty(e,t))return this.getProperty(e,t);var r=this.stateStack[this.stateStack.length-1].node;"UnaryExpression"===r.type&&"typeof"===r.operator||this.throwException(this.REFERENCE_ERROR,t+" is not defined")},t.prototype.setValueToScope=function(t,e){for(var r=this.getScope(),n=r.strict;r&&r!==this.global;){if(t in r.properties)return void(r.properties[t]=e);r=r.parentScope}if(r===this.global&&(!n||this.hasProperty(r,t)))return this.setProperty(r,t,e);this.throwException(this.REFERENCE_ERROR,t+" is not defined")},t.prototype.populateScope_=function(e,r){if("VariableDeclaration"===e.type)for(var n=0;n<e.declarations.length;n++)this.setProperty(r,e.declarations[n].id.name,void 0,t.VARIABLE_DESCRIPTOR);else{if("FunctionDeclaration"===e.type)return void this.setProperty(r,e.id.name,this.createFunction(e,r),t.VARIABLE_DESCRIPTOR);if("FunctionExpression"===e.type)return;if("ExpressionStatement"===e.type)return}var o=e.constructor;for(var i in e){var a=e[i];if(a&&"object"==typeof a)if(Array.isArray(a))for(var n=0;n<a.length;n++)a[n]&&a[n].constructor===o&&this.populateScope_(a[n],r);else a.constructor===o&&this.populateScope_(a,r)}},t.prototype.stripLocations_=function(t,e,r){e?t.start=e:delete t.start,r?t.end=r:delete t.end;for(var n in t)if(t.hasOwnProperty(n)){var o=t[n];o&&"object"==typeof o&&this.stripLocations_(o,e,r)}},t.prototype.calledWithNew=function(){return this.stateStack[this.stateStack.length-1].isConstructor},t.prototype.getValue=function(e){return e[0]===t.SCOPE_REFERENCE?this.getValueFromScope(e[1]):this.getProperty(e[0],e[1])},t.prototype.setValue=function(e,r){return e[0]===t.SCOPE_REFERENCE?this.setValueToScope(e[1],r):this.setProperty(e[0],e[1],r)},t.prototype.throwException=function(e,r){if(void 0===r)var n=e;else{var n=this.createObject(e);this.setProperty(n,"message",r,t.NONENUMERABLE_DESCRIPTOR)}throw this.executeException(n),t.STEP_ERROR},t.prototype.executeException=function(t){var e=this.stateStack.slice();do{this.stateStack.pop();var r=this.stateStack[this.stateStack.length-1];if("TryStatement"===r.node.type)return void(r.throwValue=t)}while(r&&"Program"!==r.node.type);var n;if(this.isa(t,this.ERROR)){var o={EvalError:EvalError,RangeError:RangeError,ReferenceError:ReferenceError,SyntaxError:SyntaxError,TypeError:TypeError,URIError:URIError},i=this.getProperty(t,"name").toString(),a=this.getProperty(t,"message").valueOf();n=(o[i]||Error)(a)}else n=String(t);throw this.stateStack=e,n},t.prototype.createGetter_=function(e,r){var n=Array.isArray(r)?r[0]:r,o=new this.nodeConstructor;o.type="CallExpression";var i=new t.MyState(o,this.stateStack[this.stateStack.length-1].scope);return i.doneCallee_=!0,i.funcThis_=n,i.func_=e,i.doneArgs_=!0,i.arguments_=[],i},t.prototype.createSetter_=function(e,r,n){var o=Array.isArray(r)?r[0]:this.global,i=new this.nodeConstructor;i.type="CallExpression";var a=new t.MyState(i,this.stateStack[this.stateStack.length-1].scope);return a.doneCallee_=!0,a.funcThis_=o,a.func_=e,a.doneArgs_=!0,a.arguments_=[n],a},t.prototype.stepArrayExpression=function(e,r,n){var o=n.elements,i=r.n_||0;for(r.array_?(this.setProperty(r.array_,i,r.value),i++):(r.array_=this.createObjectProto(this.ARRAY_PROTO),r.array_.properties.length=o.length);i<o.length;){if(o[i])return r.n_=i,new t.MyState(o[i],r.scope);i++}e.pop(),e[e.length-1].value=r.array_},t.prototype.stepAssignmentExpression=function(e,r,n){if(!r.doneLeft_){r.doneLeft_=!0;var o=new t.MyState(n.left,r.scope);return o.components=!0,o}if(!r.doneRight_){if(r.leftReference_||(r.leftReference_=r.value),r.doneGetter_&&(r.leftValue_=r.value),!r.doneGetter_&&"="!==n.operator){var i=this.getValue(r.leftReference_);if(r.leftValue_=i,i&&"object"==typeof i&&i.isGetter){i.isGetter=!1,r.doneGetter_=!0;var a=i;return this.createGetter_(a,r.leftReference_)}}return r.doneRight_=!0,new t.MyState(n.right,r.scope)}if(r.doneSetter_)return e.pop(),void(e[e.length-1].value=r.doneSetter_);var s=r.leftValue_,p=r.value;switch(n.operator){case"=":s=p;break;case"+=":s+=p;break;case"-=":s-=p;break;case"*=":s*=p;break;case"/=":s/=p;break;case"%=":s%=p;break;case"<<=":s<<=p;break;case">>=":s>>=p;break;case">>>=":s>>>=p;break;case"&=":s&=p;break;case"^=":s^=p;break;case"|=":s|=p;break;default:throw SyntaxError("Unknown assignment expression: "+n.operator)}var c=this.setValue(r.leftReference_,s);if(c)return r.doneSetter_=s,this.createSetter_(c,r.leftReference_,s);e.pop(),e[e.length-1].value=s},t.prototype.stepBinaryExpression=function(e,r,n){if(!r.doneLeft_)return r.doneLeft_=!0,new t.MyState(n.left,r.scope);if(!r.doneRight_)return r.doneRight_=!0,r.leftValue_=r.value,new t.MyState(n.right,r.scope);e.pop();var o,i=r.leftValue_,a=r.value;switch(n.operator){case"==":o=i==a;break;case"!=":o=i!=a;break;case"===":o=i===a;break;case"!==":o=i!==a;break;case">":o=i>a;break;case">=":o=i>=a;break;case"<":o=i<a;break;case"<=":o=i<=a;break;case"+":o=i+a;break;case"-":o=i-a;break;case"*":o=i*a;break;case"/":o=i/a;break;case"%":o=i%a;break;case"&":o=i&a;break;case"|":o=i|a;break;case"^":o=i^a;break;case"<<":o=i<<a;break;case">>":o=i>>a;break;case">>>":o=i>>>a;break;case"in":a&&a.isObject||this.throwException(this.TYPE_ERROR,"'in' expects an object, not '"+a+"'"),o=this.hasProperty(a,i);break;case"instanceof":this.isa(a,this.FUNCTION)||this.throwException(this.TYPE_ERROR,"Right-hand side of instanceof is not an object"),o=!!i.isObject&&this.isa(i,a);break;default:throw SyntaxError("Unknown binary operator: "+n.operator)}e[e.length-1].value=o},t.prototype.stepBlockStatement=function(e,r,n){var o=r.n_||0,i=n.body[o];if(i)return r.n_=o+1,new t.MyState(i,r.scope);e.pop()},t.prototype.stepBreakStatement=function(t,e,r){t.pop();var n=null;for(r.label&&(n=r.label.name);e&&"CallExpression"!==e.node.type&&"NewExpression"!==e.node.type;){if(n){if(e.labels&&-1!==e.labels.indexOf(n))return}else if(e.isLoop||e.isSwitch)return;e=t.pop()}throw SyntaxError("Illegal break statement")},t.prototype.stepCallExpression=function(e,r,n){if(!r.doneCallee_){r.doneCallee_=1;var o=new t.MyState(n.callee,r.scope);return o.components=!0,o}if(1===r.doneCallee_){r.doneCallee_=2;var i=r.value;if(Array.isArray(i)){if(r.func_=this.getValue(i),i[0]!==t.SCOPE_REFERENCE&&(r.funcThis_=i[0]),(i=r.func_)&&"object"==typeof i&&i.isGetter)return i.isGetter=!1,r.doneCallee_=1,this.createGetter_(i,r.value)}else r.func_=i;r.arguments_=[],r.n_=0}var i=r.func_;if(!r.doneArgs_){if(0!==r.n_&&r.arguments_.push(r.value),n.arguments[r.n_])return new t.MyState(n.arguments[r.n_++],r.scope);"NewExpression"===n.type?(i.illegalConstructor&&this.throwException(this.TYPE_ERROR,i+" is not a constructor"),r.funcThis_=this.createObject(i),r.isConstructor=!0):void 0===r.funcThis_&&(r.funcThis_=r.scope.strict?void 0:this.global),r.doneArgs_=!0}if(r.doneExec_)e.pop(),r.isConstructor&&"object"!=typeof r.value?e[e.length-1].value=r.funcThis_:e[e.length-1].value=r.value;else{r.doneExec_=!0,i&&i.isObject||this.throwException(this.TYPE_ERROR,i+" is not a function");var a=i.node;if(a){for(var s=this.createScope(a.body,i.parentScope),p=0;p<a.params.length;p++){var c=a.params[p].name,u=r.arguments_.length>p?r.arguments_[p]:void 0;this.setProperty(s,c,u)}for(var l=this.createObjectProto(this.ARRAY_PROTO),p=0;p<r.arguments_.length;p++)this.setProperty(l,p,r.arguments_[p]);this.setProperty(s,"arguments",l);var h=a.id&&a.id.name;return h&&this.setProperty(s,h,i),this.setProperty(s,"this",r.funcThis_,t.READONLY_DESCRIPTOR),r.value=void 0,new t.MyState(a.body,s)}if(i.eval){var f=r.arguments_[0];if("string"==typeof f){try{var y=t.acorn.parse(f.toString(),t.PARSE_OPTIONS)}catch(t){this.throwException(this.SYNTAX_ERROR,"Invalid code: "+t.message)}var d=new this.nodeConstructor;d.type="EvalProgram_",d.body=y.body,this.stripLocations_(d,n.start,n.end);var s=r.scope;return s.strict?s=this.createScope(y,s):this.populateScope_(y,s),this.value=void 0,new t.MyState(d,s)}r.value=f}else if(i.nativeFunc)r.value=i.nativeFunc.apply(r.funcThis_,r.arguments_);else{if(i.asyncFunc){var v=this,E=function(t){r.value=t,v.paused_=!1},g=r.arguments_.concat(E);return this.paused_=!0,void i.asyncFunc.apply(r.funcThis_,g)}this.throwException(this.TYPE_ERROR,i.class+" is not a function")}}},t.prototype.stepCatchClause=function(e,r,n){if(!r.done_){r.done_=!0;var o=this.createSpecialScope(r.scope);return this.setProperty(o,n.param.name,r.throwValue),new t.MyState(n.body,o)}e.pop()},t.prototype.stepConditionalExpression=function(e,r,n){var o=r.mode_||0;if(0===o)return r.mode_=1,new t.MyState(n.test,r.scope);if(1===o){r.mode_=2;var i=Boolean(r.value);if(i&&n.consequent)return new t.MyState(n.consequent,r.scope);if(!i&&n.alternate)return new t.MyState(n.alternate,r.scope);this.value=void 0}e.pop(),"ConditionalExpression"===n.type&&(e[e.length-1].value=r.value)},t.prototype.stepContinueStatement=function(t,e,r){t.pop();var n=null;for(r.label&&(n=r.label.name),e=t[t.length-1];e&&"CallExpression"!==e.node.type&&"NewExpression"!==e.node.type;){if(e.isLoop&&(!n||e.labels&&-1!==e.labels.indexOf(n)))return;t.pop(),e=t[t.length-1]}throw SyntaxError("Illegal continue statement")},t.prototype.stepDebuggerStatement=function(t,e,r){t.pop()},t.prototype.stepDoWhileStatement=function(e,r,n){if("DoWhileStatement"===n.type&&void 0===r.test_&&(r.value=!0,r.test_=!0),!r.test_)return r.test_=!0,new t.MyState(n.test,r.scope);if(r.value){if(n.body)return r.test_=!1,r.isLoop=!0,new t.MyState(n.body,r.scope)}else e.pop()},t.prototype.stepEmptyStatement=function(t,e,r){t.pop()},t.prototype.stepEvalProgram_=function(e,r,n){var o=r.n_||0,i=n.body[o];if(i)return r.n_=o+1,new t.MyState(i,r.scope);e.pop(),e[e.length-1].value=this.value},t.prototype.stepExpressionStatement=function(e,r,n){if(!r.done_)return r.done_=!0,new t.MyState(n.expression,r.scope);e.pop(),this.value=r.value},t.prototype.stepForInStatement=function(e,r,n){if(!r.doneInit_&&(r.doneInit_=!0,n.left.declarations&&n.left.declarations[0].init))return r.scope.strict&&this.throwException(this.SYNTAX_ERROR,"for-in loop variable declaration may not have an initializer."),new t.MyState(n.left,r.scope);if(!r.doneObject_)return r.doneObject_=!0,r.variable_||(r.variable_=r.value),new t.MyState(n.right,r.scope);if(r.isLoop||(r.isLoop=!0,r.object_=r.value,r.visited_=Object.create(null)),void 0===r.name_){t:do{if(r.object_&&r.object_.isObject){r.props_||(r.props_=Object.getOwnPropertyNames(r.object_.properties));do{var o=r.props_.shift()}while(o&&(r.visited_[o]||!Object.prototype.hasOwnProperty.call(r.object_.properties,o)));if(o&&(r.visited_[o]=!0,Object.prototype.propertyIsEnumerable.call(r.object_.properties,o))){r.name_=o;break t}}else if(null!==r.object_){r.props_||(r.props_=Object.getOwnPropertyNames(r.object_));do{var o=r.props_.shift()}while(o&&r.visited_[o]);if(o){r.visited_[o]=!0,r.name_=o;break t}}r.object_=this.getPrototype(r.object_),r.props_=null}while(null!==r.object_);if(null===r.object_)return void e.pop()}if(!r.doneVariable_){r.doneVariable_=!0;var i=n.left;if("VariableDeclaration"!==i.type){r.variable_=null;var a=new t.MyState(i,r.scope);return a.components=!0,a}r.variable_=[t.SCOPE_REFERENCE,i.declarations[0].id.name]}if(r.variable_||(r.variable_=r.value),!r.doneSetter_){r.doneSetter_=!0;var s=r.name_,p=this.setValue(r.variable_,s);if(p)return this.createSetter_(p,r.variable_,s)}return r.name_=void 0,r.doneVariable_=!1,r.doneSetter_=!1,n.body?new t.MyState(n.body,r.scope):void 0},t.prototype.stepForStatement=function(e,r,n){var o=r.mode_||0;if(0===o){if(r.mode_=1,n.init)return new t.MyState(n.init,r.scope)}else if(1===o){if(r.mode_=2,n.test)return new t.MyState(n.test,r.scope)}else if(2===o){if(r.mode_=3,!n.test||r.value)return r.isLoop=!0,new t.MyState(n.body,r.scope);e.pop()}else if(3===o&&(r.mode_=1,n.update))return new t.MyState(n.update,r.scope)},t.prototype.stepFunctionDeclaration=function(t,e,r){t.pop()},t.prototype.stepFunctionExpression=function(t,e,r){t.pop(),t[t.length-1].value=this.createFunction(r,e.scope)},t.prototype.stepIdentifier=function(e,r,n){if(e.pop(),r.components)return void(e[e.length-1].value=[t.SCOPE_REFERENCE,n.name]);var o=this.getValueFromScope(n.name);if(o&&"object"==typeof o&&o.isGetter){o.isGetter=!1;for(var i=r.scope;!this.hasProperty(i,n.name);)i=i.parentScope;var a=o;return this.createGetter_(a,this.global)}e[e.length-1].value=o},t.prototype.stepIfStatement=function(t,e,r){return this.stepConditionalExpression(t,e,r)},t.prototype.stepLabeledStatement=function(e,r,n){e.pop();var o=r.labels||[];o.push(n.label.name);var i=new t.MyState(n.body,r.scope);return i.labels=o,i},t.prototype.stepLiteral=function(t,e,r){t.pop();var n=r.value;if(n instanceof RegExp){var o=this.createObjectProto(this.REGEXP_PROTO);this.populateRegExp(o,n),n=o}t[t.length-1].value=n},t.prototype.stepLogicalExpression=function(e,r,n){if("&&"!==n.operator&&"||"!==n.operator)throw SyntaxError("Unknown logical operator: "+n.operator);if(!r.doneLeft_)return r.doneLeft_=!0,new t.MyState(n.left,r.scope);if(r.doneRight_)e.pop(),e[e.length-1].value=r.value;else{if(!("&&"===n.operator&&!r.value||"||"===n.operator&&r.value))return r.doneRight_=!0,new t.MyState(n.right,r.scope);e.pop(),e[e.length-1].value=r.value}},t.prototype.stepMemberExpression=function(e,r,n){if(!r.doneObject_)return r.doneObject_=!0,new t.MyState(n.object,r.scope);var o;if(n.computed){if(!r.doneProperty_)return 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__WEBPACK_AMD_DEFINE_RESULT__ = function (require, exports, acorn, Interpreter) {\r\n    \"use strict\";\r\n    /*!\r\n     * @license\r\n     * JavaScript Interpreter bundled with acorn v0.4.1\r\n     *\r\n     * Copyright 2013-2017 Google Inc. and Jun Kato\r\n     *\r\n     * Licensed under the Apache License, Version 2.0 (the \"License\");\r\n     * you may not use this file except in compliance with the License.\r\n     * You may obtain a copy of the License at\r\n     *\r\n     *   http://www.apache.org/licenses/LICENSE-2.0\r\n     *\r\n     * Unless required by applicable law or agreed to in writing, software\r\n     * distributed under the License is distributed on an \"AS IS\" BASIS,\r\n     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n     * See the License for the specific language governing permissions and\r\n     * limitations under the License.\r\n     */\r\n    /**\r\n     * @fileoverview Interpreting JavaScript in JavaScript (concatenated with acorn)\r\n     * @author fraser@google.com (Neil Fraser)\r\n     * @author i@junkato.jp (Jun Kato)\r\n     */\r\n    Interpreter.acorn = acorn;\r\n    return Interpreter;\r\n}.apply(exports, __WEBPACK_AMD_DEFINE_ARRAY__),\n\t\t\t\t__WEBPACK_AMD_DEFINE_RESULT__ !== undefined && (module.exports = __WEBPACK_AMD_DEFINE_RESULT__));\r\n\n\n/***/ }),\n/* 2 */\n/***/ (function(module, exports, __webpack_require__) {\n\n\"use strict\";\n/* WEBPACK VAR INJECTION */(function(module) {var __WEBPACK_AMD_DEFINE_FACTORY__, __WEBPACK_AMD_DEFINE_ARRAY__, __WEBPACK_AMD_DEFINE_RESULT__;\n\nvar _typeof = typeof Symbol === \"function\" && typeof Symbol.iterator === \"symbol\" ? function (obj) { return typeof obj; } : function (obj) { return obj && typeof Symbol === \"function\" && obj.constructor === Symbol && obj !== Symbol.prototype ? \"symbol\" : typeof obj; };\n\n// Acorn is a tiny, fast JavaScript parser written in JavaScript.\n//\n// Acorn was written by Marijn Haverbeke and released under an MIT\n// license. The Unicode regexps (for identifiers and whitespace) were\n// taken from [Esprima](http://esprima.org) by Ariya Hidayat.\n//\n// Git repositories for Acorn are available at\n//\n//     http://marijnhaverbeke.nl/git/acorn\n//     https://github.com/marijnh/acorn.git\n//\n// Please use the [github bug tracker][ghbt] to report issues.\n//\n// [ghbt]: https://github.com/marijnh/acorn/issues\n//\n// This file defines the main parser interface. The library also comes\n// with a [error-tolerant parser][dammit] and an\n// [abstract syntax tree walker][walk], defined in other files.\n//\n// [dammit]: acorn_loose.js\n// [walk]: util/walk.js\n\n(function (root, mod) {\n  if (( false ? \"undefined\" : _typeof(exports)) == \"object\" && ( false ? \"undefined\" : _typeof(module)) == \"object\") return mod(exports); // CommonJS\n  if (true) return !(__WEBPACK_AMD_DEFINE_ARRAY__ = [exports], __WEBPACK_AMD_DEFINE_FACTORY__ = (mod),\n\t\t\t\t__WEBPACK_AMD_DEFINE_RESULT__ = (typeof __WEBPACK_AMD_DEFINE_FACTORY__ === 'function' ?\n\t\t\t\t(__WEBPACK_AMD_DEFINE_FACTORY__.apply(exports, __WEBPACK_AMD_DEFINE_ARRAY__)) : __WEBPACK_AMD_DEFINE_FACTORY__),\n\t\t\t\t__WEBPACK_AMD_DEFINE_RESULT__ !== undefined && (module.exports = __WEBPACK_AMD_DEFINE_RESULT__)); // AMD\n  mod(root.acorn || (root.acorn = {})); // Plain browser env\n})(undefined, function (exports) {\n  \"use strict\";\n\n  exports.version = \"0.4.1\";\n\n  // The main exported interface (under `self.acorn` when in the\n  // browser) is a `parse` function that takes a code string and\n  // returns an abstract syntax tree as specified by [Mozilla parser\n  // API][api], with the caveat that the SpiderMonkey-specific syntax\n  // (`let`, `yield`, inline XML, etc) is not recognized.\n  //\n  // [api]: https://developer.mozilla.org/en-US/docs/SpiderMonkey/Parser_API\n\n  var options, input, inputLen, sourceFile;\n\n  exports.parse = function (inpt, opts) {\n    input = String(inpt);inputLen = input.length;\n    setOptions(opts);\n    initTokenState();\n    return parseTopLevel(options.program);\n  };\n\n  // A second optional argument can be given to further configure\n  // the parser process. These options are recognized:\n\n  var defaultOptions = exports.defaultOptions = {\n    // `ecmaVersion` indicates the ECMAScript version to parse. Must\n    // be either 3 or 5. This\n    // influences support for strict mode, the set of reserved words, and\n    // support for getters and setter.\n    ecmaVersion: 5,\n    // Turn on `strictSemicolons` to prevent the parser from doing\n    // automatic semicolon insertion.\n    strictSemicolons: false,\n    // When `allowTrailingCommas` is false, the parser will not allow\n    // trailing commas in array and object literals.\n    allowTrailingCommas: true,\n    // By default, reserved words are not enforced. Enable\n    // `forbidReserved` to enforce them.\n    forbidReserved: false,\n    // When `locations` is on, `loc` properties holding objects with\n    // `start` and `end` properties in `{line, column}` form (with\n    // line being 1-based and column 0-based) will be attached to the\n    // nodes.\n    locations: false,\n    // A function can be passed as `onComment` option, which will\n    // cause Acorn to call that function with `(block, text, start,\n    // end)` parameters whenever a comment is skipped. `block` is a\n    // boolean indicating whether this is a block (`/* */`) comment,\n    // `text` is the content of the comment, and `start` and `end` are\n    // character offsets that denote the start and end of the comment.\n    // When the `locations` option is on, two more parameters are\n    // passed, the full `{line, column}` locations of the start and\n    // end of the comments.\n    onComment: null,\n    // Nodes have their start and end characters offsets recorded in\n    // `start` and `end` properties (directly on the node, rather than\n    // the `loc` object, which holds line/column data. To also add a\n    // [semi-standardized][range] `range` property holding a `[start,\n    // end]` array with the same numbers, set the `ranges` option to\n    // `true`.\n    //\n    // [range]: https://bugzilla.mozilla.org/show_bug.cgi?id=745678\n    ranges: false,\n    // It is possible to parse multiple files into a single AST by\n    // passing the tree produced by parsing the first file as\n    // `program` option in subsequent parses. This will add the\n    // toplevel forms of the parsed file to the `Program` (top) node\n    // of an existing parse tree.\n    program: null,\n    // When `location` is on, you can pass this to record the source\n    // file in every node's `loc` object.\n    sourceFile: null,\n    // This value, if given, is stored in every node, whether\n    // `location` is on or off.\n    directSourceFile: null\n  };\n\n  function setOptions(opts) {\n    options = opts || {};\n    for (var opt in defaultOptions) {\n      if (!Object.prototype.hasOwnProperty.call(options, opt)) options[opt] = defaultOptions[opt];\n    }sourceFile = options.sourceFile || null;\n  }\n\n  // The `getLineInfo` function is mostly useful when the\n  // `locations` option is off (for performance reasons) and you\n  // want to find the line/column position for a given character\n  // offset. `input` should be the code string that the offset refers\n  // into.\n\n  var getLineInfo = exports.getLineInfo = function (input, offset) {\n    for (var line = 1, cur = 0;;) {\n      lineBreak.lastIndex = cur;\n      var match = lineBreak.exec(input);\n      if (match && match.index < offset) {\n        ++line;\n        cur = match.index + match[0].length;\n      } else break;\n    }\n    return { line: line, column: offset - cur };\n  };\n\n  // Acorn is organized as a tokenizer and a recursive-descent parser.\n  // The `tokenize` export provides an interface to the tokenizer.\n  // Because the tokenizer is optimized for being efficiently used by\n  // the Acorn parser itself, this interface is somewhat crude and not\n  // very modular. Performing another parse or call to `tokenize` will\n  // reset the internal state, and invalidate existing tokenizers.\n\n  exports.tokenize = function (inpt, opts) {\n    input = String(inpt);inputLen = input.length;\n    setOptions(opts);\n    initTokenState();\n\n    var t = {};\n    function getToken(forceRegexp) {\n      readToken(forceRegexp);\n      t.start = tokStart;t.end = tokEnd;\n      t.startLoc = tokStartLoc;t.endLoc = tokEndLoc;\n      t.type = tokType;t.value = tokVal;\n      return t;\n    }\n    getToken.jumpTo = function (pos, reAllowed) {\n      tokPos = pos;\n      if (options.locations) {\n        tokCurLine = 1;\n        tokLineStart = lineBreak.lastIndex = 0;\n        var match;\n        while ((match = lineBreak.exec(input)) && match.index < pos) {\n          ++tokCurLine;\n          tokLineStart = match.index + match[0].length;\n        }\n      }\n      tokRegexpAllowed = reAllowed;\n      skipSpace();\n    };\n    return getToken;\n  };\n\n  // State is kept in (closure-)global variables. We already saw the\n  // `options`, `input`, and `inputLen` variables above.\n\n  // The current position of the tokenizer in the input.\n\n  var tokPos;\n\n  // The start and end offsets of the current token.\n\n  var tokStart, tokEnd;\n\n  // When `options.locations` is true, these hold objects\n  // containing the tokens start and end line/column pairs.\n\n  var tokStartLoc, tokEndLoc;\n\n  // The type and value of the current token. Token types are objects,\n  // named by variables against which they can be compared, and\n  // holding properties that describe them (indicating, for example,\n  // the precedence of an infix operator, and the original name of a\n  // keyword token). The kind of value that's held in `tokVal` depends\n  // on the type of the token. For literals, it is the literal value,\n  // for operators, the operator name, and so on.\n\n  var tokType, tokVal;\n\n  // Interal state for the tokenizer. To distinguish between division\n  // operators and regular expressions, it remembers whether the last\n  // token was one that is allowed to be followed by an expression.\n  // (If it is, a slash is probably a regexp, if it isn't it's a\n  // division operator. See the `parseStatement` function for a\n  // caveat.)\n\n  var tokRegexpAllowed;\n\n  // When `options.locations` is true, these are used to keep\n  // track of the current line, and know when a new line has been\n  // entered.\n\n  var tokCurLine, tokLineStart;\n\n  // These store the position of the previous token, which is useful\n  // when finishing a node and assigning its `end` position.\n\n  var lastStart, lastEnd, lastEndLoc;\n\n  // This is the parser's state. `inFunction` is used to reject\n  // `return` statements outside of functions, `labels` to verify that\n  // `break` and `continue` have somewhere to jump to, and `strict`\n  // indicates whether strict mode is on.\n\n  var inFunction, labels, strict;\n\n  // This function is used to raise exceptions on parse errors. It\n  // takes an offset integer (into the current `input`) to indicate\n  // the location of the error, attaches the position to the end\n  // of the error message, and then raises a `SyntaxError` with that\n  // message.\n\n  function raise(pos, message) {\n    var loc = getLineInfo(input, pos);\n    message += \" (\" + loc.line + \":\" + loc.column + \")\";\n    var err = new SyntaxError(message);\n    err.pos = pos;err.loc = loc;err.raisedAt = tokPos;\n    throw err;\n  }\n\n  // Reused empty array added for node fields that are always empty.\n\n  var empty = [];\n\n  // ## Token types\n\n  // The assignment of fine-grained, information-carrying type objects\n  // allows the tokenizer to store the information it has about a\n  // token in a way that is very cheap for the parser to look up.\n\n  // All token type variables start with an underscore, to make them\n  // easy to recognize.\n\n  // These are the general types. The `type` property is only used to\n  // make them recognizeable when debugging.\n\n  var _num = { type: \"num\" },\n      _regexp = { type: \"regexp\" },\n      _string = { type: \"string\" };\n  var _name = { type: \"name\" },\n      _eof = { type: \"eof\" };\n\n  // Keyword tokens. The `keyword` property (also used in keyword-like\n  // operators) indicates that the token originated from an\n  // identifier-like word, which is used when parsing property names.\n  //\n  // The `beforeExpr` property is used to disambiguate between regular\n  // expressions and divisions. It is set on all token types that can\n  // be followed by an expression (thus, a slash after them would be a\n  // regular expression).\n  //\n  // `isLoop` marks a keyword as starting a loop, which is important\n  // to know when parsing a label, in order to allow or disallow\n  // continue jumps to that label.\n\n  var _break = { keyword: \"break\" },\n      _case = { keyword: \"case\", beforeExpr: true },\n      _catch = { keyword: \"catch\" };\n  var _continue = { keyword: \"continue\" },\n      _debugger = { keyword: \"debugger\" },\n      _default = { keyword: \"default\" };\n  var _do = { keyword: \"do\", isLoop: true },\n      _else = { keyword: \"else\", beforeExpr: true };\n  var _finally = { keyword: \"finally\" },\n      _for = { keyword: \"for\", isLoop: true },\n      _function = { keyword: \"function\" };\n  var _if = { keyword: \"if\" },\n      _return = { keyword: \"return\", beforeExpr: true },\n      _switch = { keyword: \"switch\" };\n  var _throw = { keyword: \"throw\", beforeExpr: true },\n      _try = { keyword: \"try\" },\n      _var = { keyword: \"var\" };\n  var _while = { keyword: \"while\", isLoop: true },\n      _with = { keyword: \"with\" },\n      _new = { keyword: \"new\", beforeExpr: true };\n  var _this = { keyword: \"this\" };\n\n  // The keywords that denote values.\n\n  var _null = { keyword: \"null\", atomValue: null },\n      _true = { keyword: \"true\", atomValue: true };\n  var _false = { keyword: \"false\", atomValue: false };\n\n  // Some keywords are treated as regular operators. `in` sometimes\n  // (when parsing `for`) needs to be tested against specifically, so\n  // we assign a variable name to it for quick comparing.\n\n  var _in = { keyword: \"in\", binop: 7, beforeExpr: true };\n\n  // Map keyword names to token types.\n\n  var keywordTypes = { \"break\": _break, \"case\": _case, \"catch\": _catch,\n    \"continue\": _continue, \"debugger\": _debugger, \"default\": _default,\n    \"do\": _do, \"else\": _else, \"finally\": _finally, \"for\": _for,\n    \"function\": _function, \"if\": _if, \"return\": _return, \"switch\": _switch,\n    \"throw\": _throw, \"try\": _try, \"var\": _var, \"while\": _while, \"with\": _with,\n    \"null\": _null, \"true\": _true, \"false\": _false, \"new\": _new, \"in\": _in,\n    \"instanceof\": { keyword: \"instanceof\", binop: 7, beforeExpr: true }, \"this\": _this,\n    \"typeof\": { keyword: \"typeof\", prefix: true, beforeExpr: true },\n    \"void\": { keyword: \"void\", prefix: true, beforeExpr: true },\n    \"delete\": { keyword: \"delete\", prefix: true, beforeExpr: true } };\n\n  // Punctuation token types. Again, the `type` property is purely for debugging.\n\n  var _bracketL = { type: \"[\", beforeExpr: true },\n      _bracketR = { type: \"]\" },\n      _braceL = { type: \"{\", beforeExpr: true };\n  var _braceR = { type: \"}\" },\n      _parenL = { type: \"(\", beforeExpr: true },\n      _parenR = { type: \")\" };\n  var _comma = { type: \",\", beforeExpr: true },\n      _semi = { type: \";\", beforeExpr: true };\n  var _colon = { type: \":\", beforeExpr: true },\n      _dot = { type: \".\" },\n      _question = { type: \"?\", beforeExpr: true };\n\n  // Operators. These carry several kinds of properties to help the\n  // parser use them properly (the presence of these properties is\n  // what categorizes them as operators).\n  //\n  // `binop`, when present, specifies that this operator is a binary\n  // operator, and will refer to its precedence.\n  //\n  // `prefix` and `postfix` mark the operator as a prefix or postfix\n  // unary operator. `isUpdate` specifies that the node produced by\n  // the operator should be of type UpdateExpression rather than\n  // simply UnaryExpression (`++` and `--`).\n  //\n  // `isAssign` marks all of `=`, `+=`, `-=` etcetera, which act as\n  // binary operators with a very low precedence, that should result\n  // in AssignmentExpression nodes.\n\n  var _slash = { binop: 10, beforeExpr: true },\n      _eq = { isAssign: true, beforeExpr: true };\n  var _assign = { isAssign: true, beforeExpr: true };\n  var _incDec = { postfix: true, prefix: true, isUpdate: true },\n      _prefix = { prefix: true, beforeExpr: true };\n  var _logicalOR = { binop: 1, beforeExpr: true };\n  var _logicalAND = { binop: 2, beforeExpr: true };\n  var _bitwiseOR = { binop: 3, beforeExpr: true };\n  var _bitwiseXOR = { binop: 4, beforeExpr: true };\n  var _bitwiseAND = { binop: 5, beforeExpr: true };\n  var _equality = { binop: 6, beforeExpr: true };\n  var _relational = { binop: 7, beforeExpr: true };\n  var _bitShift = { binop: 8, beforeExpr: true };\n  var _plusMin = { binop: 9, prefix: true, beforeExpr: true };\n  var _multiplyModulo = { binop: 10, beforeExpr: true };\n\n  // Provide access to the token types for external users of the\n  // tokenizer.\n\n  exports.tokTypes = { bracketL: _bracketL, bracketR: _bracketR, braceL: _braceL, braceR: _braceR,\n    parenL: _parenL, parenR: _parenR, comma: _comma, semi: _semi, colon: _colon,\n    dot: _dot, question: _question, slash: _slash, eq: _eq, name: _name, eof: _eof,\n    num: _num, regexp: _regexp, string: _string };\n  for (var kw in keywordTypes) {\n    exports.tokTypes[\"_\" + kw] = keywordTypes[kw];\n  } // This is a trick taken from Esprima. It turns out that, on\n  // non-Chrome browsers, to check whether a string is in a set, a\n  // predicate containing a big ugly `switch` statement is faster than\n  // a regular expression, and on Chrome the two are about on par.\n  // This function uses `eval` (non-lexical) to produce such a\n  // predicate from a space-separated string of words.\n  //\n  // It starts by sorting the words by length.\n\n  function makePredicate(words) {\n    words = words.split(\" \");\n    var f = \"\",\n        cats = [];\n    out: for (var i = 0; i < words.length; ++i) {\n      for (var j = 0; j < cats.length; ++j) {\n        if (cats[j][0].length == words[i].length) {\n          cats[j].push(words[i]);\n          continue out;\n        }\n      }cats.push([words[i]]);\n    }\n    function compareTo(arr) {\n      if (arr.length == 1) return f += \"return str === \" + JSON.stringify(arr[0]) + \";\";\n      f += \"switch(str){\";\n      for (var i = 0; i < arr.length; ++i) {\n        f += \"case \" + JSON.stringify(arr[i]) + \":\";\n      }f += \"return true}return false;\";\n    }\n\n    // When there are more than three length categories, an outer\n    // switch first dispatches on the lengths, to save on comparisons.\n\n    if (cats.length > 3) {\n      cats.sort(function (a, b) {\n        return b.length - a.length;\n      });\n      f += \"switch(str.length){\";\n      for (var i = 0; i < cats.length; ++i) {\n        var cat = cats[i];\n        f += \"case \" + cat[0].length + \":\";\n        compareTo(cat);\n      }\n      f += \"}\";\n\n      // Otherwise, simply generate a flat `switch` statement.\n    } else {\n      compareTo(words);\n    }\n    return new Function(\"str\", f);\n  }\n\n  // The ECMAScript 3 reserved word list.\n\n  var isReservedWord3 = makePredicate(\"abstract boolean byte char class double enum export extends final float goto implements import int interface long native package private protected public short static super synchronized throws transient volatile\");\n\n  // ECMAScript 5 reserved words.\n\n  var isReservedWord5 = makePredicate(\"class enum extends super const export import\");\n\n  // The additional reserved words in strict mode.\n\n  var isStrictReservedWord = makePredicate(\"implements interface let package private protected public static yield\");\n\n  // The forbidden variable names in strict mode.\n\n  var isStrictBadIdWord = makePredicate(\"eval arguments\");\n\n  // And the keywords.\n\n  var isKeyword = makePredicate(\"break case catch continue debugger default do else finally for function if return switch throw try var while with null true false instanceof typeof void delete new in this\");\n\n  // ## Character categories\n\n  // Big ugly regular expressions that match characters in the\n  // whitespace, identifier, and identifier-start categories. These\n  // are only applied when a character is found to actually have a\n  // code point above 128.\n\n  var nonASCIIwhitespace = /[\\u1680\\u180e\\u2000-\\u200a\\u202f\\u205f\\u3000\\ufeff]/;\n  var nonASCIIidentifierStartChars = \"\\xAA\\xB5\\xBA\\xC0-\\xD6\\xD8-\\xF6\\xF8-\\u02C1\\u02C6-\\u02D1\\u02E0-\\u02E4\\u02EC\\u02EE\\u0370-\\u0374\\u0376\\u0377\\u037A-\\u037D\\u0386\\u0388-\\u038A\\u038C\\u038E-\\u03A1\\u03A3-\\u03F5\\u03F7-\\u0481\\u048A-\\u0527\\u0531-\\u0556\\u0559\\u0561-\\u0587\\u05D0-\\u05EA\\u05F0-\\u05F2\\u0620-\\u064A\\u066E\\u066F\\u0671-\\u06D3\\u06D5\\u06E5\\u06E6\\u06EE\\u06EF\\u06FA-\\u06FC\\u06FF\\u0710\\u0712-\\u072F\\u074D-\\u07A5\\u07B1\\u07CA-\\u07EA\\u07F4\\u07F5\\u07FA\\u0800-\\u0815\\u081A\\u0824\\u0828\\u0840-\\u0858\\u08A0\\u08A2-\\u08AC\\u0904-\\u0939\\u093D\\u0950\\u0958-\\u0961\\u0971-\\u0977\\u0979-\\u097F\\u0985-\\u098C\\u098F\\u0990\\u0993-\\u09A8\\u09AA-\\u09B0\\u09B2\\u09B6-\\u09B9\\u09BD\\u09CE\\u09DC\\u09DD\\u09DF-\\u09E1\\u09F0\\u09F1\\u0A05-\\u0A0A\\u0A0F\\u0A10\\u0A13-\\u0A28\\u0A2A-\\u0A30\\u0A32\\u0A33\\u0A35\\u0A36\\u0A38\\u0A39\\u0A59-\\u0A5C\\u0A5E\\u0A72-\\u0A74\\u0A85-\\u0A8D\\u0A8F-\\u0A91\\u0A93-\\u0AA8\\u0AAA-\\u0AB0\\u0AB2\\u0AB3\\u0AB5-\\u0AB9\\u0ABD\\u0AD0\\u0AE0\\u0AE1\\u0B05-\\u0B0C\\u0B0F\\u0B10\\u0B13-\\u0B28\\u0B2A-\\u0B30\\u0B32\\u0B33\\u0B35-\\u0B39\\u0B3D\\u0B5C\\u0B5D\\u0B5F-\\u0B61\\u0B71\\u0B83\\u0B85-\\u0B8A\\u0B8E-\\u0B90\\u0B92-\\u0B95\\u0B99\\u0B9A\\u0B9C\\u0B9E\\u0B9F\\u0BA3\\u0BA4\\u0BA8-\\u0BAA\\u0BAE-\\u0BB9\\u0BD0\\u0C05-\\u0C0C\\u0C0E-\\u0C10\\u0C12-\\u0C28\\u0C2A-\\u0C33\\u0C35-\\u0C39\\u0C3D\\u0C58\\u0C59\\u0C60\\u0C61\\u0C85-\\u0C8C\\u0C8E-\\u0C90\\u0C92-\\u0CA8\\u0CAA-\\u0CB3\\u0CB5-\\u0CB9\\u0CBD\\u0CDE\\u0CE0\\u0CE1\\u0CF1\\u0CF2\\u0D05-\\u0D0C\\u0D0E-\\u0D10\\u0D12-\\u0D3A\\u0D3D\\u0D4E\\u0D60\\u0D61\\u0D7A-\\u0D7F\\u0D85-\\u0D96\\u0D9A-\\u0DB1\\u0DB3-\\u0DBB\\u0DBD\\u0DC0-\\u0DC6\\u0E01-\\u0E30\\u0E32\\u0E33\\u0E40-\\u0E46\\u0E81\\u0E82\\u0E84\\u0E87\\u0E88\\u0E8A\\u0E8D\\u0E94-\\u0E97\\u0E99-\\u0E9F\\u0EA1-\\u0EA3\\u0EA5\\u0EA7\\u0EAA\\u0EAB\\u0EAD-\\u0EB0\\u0EB2\\u0EB3\\u0EBD\\u0EC0-\\u0EC4\\u0EC6\\u0EDC-\\u0EDF\\u0F00\\u0F40-\\u0F47\\u0F49-\\u0F6C\\u0F88-\\u0F8C\\u1000-\\u102A\\u103F\\u1050-\\u1055\\u105A-\\u105D\\u1061\\u1065\\u1066\\u106E-\\u1070\\u1075-\\u1081\\u108E\\u10A0-\\u10C5\\u10C7\\u10CD\\u10D0-\\u10FA\\u10FC-\\u1248\\u124A-\\u124D\\u1250-\\u1256\\u1258\\u125A-\\u125D\\u1260-\\u1288\\u128A-\\u128D\\u1290-\\u12B0\\u12B2-\\u12B5\\u12B8-\\u12BE\\u12C0\\u12C2-\\u12C5\\u12C8-\\u12D6\\u12D8-\\u1310\\u1312-\\u1315\\u1318-\\u135A\\u1380-\\u138F\\u13A0-\\u13F4\\u1401-\\u166C\\u166F-\\u167F\\u1681-\\u169A\\u16A0-\\u16EA\\u16EE-\\u16F0\\u1700-\\u170C\\u170E-\\u1711\\u1720-\\u1731\\u1740-\\u1751\\u1760-\\u176C\\u176E-\\u1770\\u1780-\\u17B3\\u17D7\\u17DC\\u1820-\\u1877\\u1880-\\u18A8\\u18AA\\u18B0-\\u18F5\\u1900-\\u191C\\u1950-\\u196D\\u1970-\\u1974\\u1980-\\u19AB\\u19C1-\\u19C7\\u1A00-\\u1A16\\u1A20-\\u1A54\\u1AA7\\u1B05-\\u1B33\\u1B45-\\u1B4B\\u1B83-\\u1BA0\\u1BAE\\u1BAF\\u1BBA-\\u1BE5\\u1C00-\\u1C23\\u1C4D-\\u1C4F\\u1C5A-\\u1C7D\\u1CE9-\\u1CEC\\u1CEE-\\u1CF1\\u1CF5\\u1CF6\\u1D00-\\u1DBF\\u1E00-\\u1F15\\u1F18-\\u1F1D\\u1F20-\\u1F45\\u1F48-\\u1F4D\\u1F50-\\u1F57\\u1F59\\u1F5B\\u1F5D\\u1F5F-\\u1F7D\\u1F80-\\u1FB4\\u1FB6-\\u1FBC\\u1FBE\\u1FC2-\\u1FC4\\u1FC6-\\u1FCC\\u1FD0-\\u1FD3\\u1FD6-\\u1FDB\\u1FE0-\\u1FEC\\u1FF2-\\u1FF4\\u1FF6-\\u1FFC\\u2071\\u207F\\u2090-\\u209C\\u2102\\u2107\\u210A-\\u2113\\u2115\\u2119-\\u211D\\u2124\\u2126\\u2128\\u212A-\\u212D\\u212F-\\u2139\\u213C-\\u213F\\u2145-\\u2149\\u214E\\u2160-\\u2188\\u2C00-\\u2C2E\\u2C30-\\u2C5E\\u2C60-\\u2CE4\\u2CEB-\\u2CEE\\u2CF2\\u2CF3\\u2D00-\\u2D25\\u2D27\\u2D2D\\u2D30-\\u2D67\\u2D6F\\u2D80-\\u2D96\\u2DA0-\\u2DA6\\u2DA8-\\u2DAE\\u2DB0-\\u2DB6\\u2DB8-\\u2DBE\\u2DC0-\\u2DC6\\u2DC8-\\u2DCE\\u2DD0-\\u2DD6\\u2DD8-\\u2DDE\\u2E2F\\u3005-\\u3007\\u3021-\\u3029\\u3031-\\u3035\\u3038-\\u303C\\u3041-\\u3096\\u309D-\\u309F\\u30A1-\\u30FA\\u30FC-\\u30FF\\u3105-\\u312D\\u3131-\\u318E\\u31A0-\\u31BA\\u31F0-\\u31FF\\u3400-\\u4DB5\\u4E00-\\u9FCC\\uA000-\\uA48C\\uA4D0-\\uA4FD\\uA500-\\uA60C\\uA610-\\uA61F\\uA62A\\uA62B\\uA640-\\uA66E\\uA67F-\\uA697\\uA6A0-\\uA6EF\\uA717-\\uA71F\\uA722-\\uA788\\uA78B-\\uA78E\\uA790-\\uA793\\uA7A0-\\uA7AA\\uA7F8-\\uA801\\uA803-\\uA805\\uA807-\\uA80A\\uA80C-\\uA822\\uA840-\\uA873\\uA882-\\uA8B3\\uA8F2-\\uA8F7\\uA8FB\\uA90A-\\uA925\\uA930-\\uA946\\uA960-\\uA97C\\uA984-\\uA9B2\\uA9CF\\uAA00-\\uAA28\\uAA40-\\uAA42\\uAA44-\\uAA4B\\uAA60-\\uAA76\\uAA7A\\uAA80-\\uAAAF\\uAAB1\\uAAB5\\uAAB6\\uAAB9-\\uAABD\\uAAC0\\uAAC2\\uAADB-\\uAADD\\uAAE0-\\uAAEA\\uAAF2-\\uAAF4\\uAB01-\\uAB06\\uAB09-\\uAB0E\\uAB11-\\uAB16\\uAB20-\\uAB26\\uAB28-\\uAB2E\\uABC0-\\uABE2\\uAC00-\\uD7A3\\uD7B0-\\uD7C6\\uD7CB-\\uD7FB\\uF900-\\uFA6D\\uFA70-\\uFAD9\\uFB00-\\uFB06\\uFB13-\\uFB17\\uFB1D\\uFB1F-\\uFB28\\uFB2A-\\uFB36\\uFB38-\\uFB3C\\uFB3E\\uFB40\\uFB41\\uFB43\\uFB44\\uFB46-\\uFBB1\\uFBD3-\\uFD3D\\uFD50-\\uFD8F\\uFD92-\\uFDC7\\uFDF0-\\uFDFB\\uFE70-\\uFE74\\uFE76-\\uFEFC\\uFF21-\\uFF3A\\uFF41-\\uFF5A\\uFF66-\\uFFBE\\uFFC2-\\uFFC7\\uFFCA-\\uFFCF\\uFFD2-\\uFFD7\\uFFDA-\\uFFDC\";\n  var nonASCIIidentifierChars = \"\\u0300-\\u036F\\u0483-\\u0487\\u0591-\\u05BD\\u05BF\\u05C1\\u05C2\\u05C4\\u05C5\\u05C7\\u0610-\\u061A\\u0620-\\u0649\\u0672-\\u06D3\\u06E7-\\u06E8\\u06FB-\\u06FC\\u0730-\\u074A\\u0800-\\u0814\\u081B-\\u0823\\u0825-\\u0827\\u0829-\\u082D\\u0840-\\u0857\\u08E4-\\u08FE\\u0900-\\u0903\\u093A-\\u093C\\u093E-\\u094F\\u0951-\\u0957\\u0962-\\u0963\\u0966-\\u096F\\u0981-\\u0983\\u09BC\\u09BE-\\u09C4\\u09C7\\u09C8\\u09D7\\u09DF-\\u09E0\\u0A01-\\u0A03\\u0A3C\\u0A3E-\\u0A42\\u0A47\\u0A48\\u0A4B-\\u0A4D\\u0A51\\u0A66-\\u0A71\\u0A75\\u0A81-\\u0A83\\u0ABC\\u0ABE-\\u0AC5\\u0AC7-\\u0AC9\\u0ACB-\\u0ACD\\u0AE2-\\u0AE3\\u0AE6-\\u0AEF\\u0B01-\\u0B03\\u0B3C\\u0B3E-\\u0B44\\u0B47\\u0B48\\u0B4B-\\u0B4D\\u0B56\\u0B57\\u0B5F-\\u0B60\\u0B66-\\u0B6F\\u0B82\\u0BBE-\\u0BC2\\u0BC6-\\u0BC8\\u0BCA-\\u0BCD\\u0BD7\\u0BE6-\\u0BEF\\u0C01-\\u0C03\\u0C46-\\u0C48\\u0C4A-\\u0C4D\\u0C55\\u0C56\\u0C62-\\u0C63\\u0C66-\\u0C6F\\u0C82\\u0C83\\u0CBC\\u0CBE-\\u0CC4\\u0CC6-\\u0CC8\\u0CCA-\\u0CCD\\u0CD5\\u0CD6\\u0CE2-\\u0CE3\\u0CE6-\\u0CEF\\u0D02\\u0D03\\u0D46-\\u0D48\\u0D57\\u0D62-\\u0D63\\u0D66-\\u0D6F\\u0D82\\u0D83\\u0DCA\\u0DCF-\\u0DD4\\u0DD6\\u0DD8-\\u0DDF\\u0DF2\\u0DF3\\u0E34-\\u0E3A\\u0E40-\\u0E45\\u0E50-\\u0E59\\u0EB4-\\u0EB9\\u0EC8-\\u0ECD\\u0ED0-\\u0ED9\\u0F18\\u0F19\\u0F20-\\u0F29\\u0F35\\u0F37\\u0F39\\u0F41-\\u0F47\\u0F71-\\u0F84\\u0F86-\\u0F87\\u0F8D-\\u0F97\\u0F99-\\u0FBC\\u0FC6\\u1000-\\u1029\\u1040-\\u1049\\u1067-\\u106D\\u1071-\\u1074\\u1082-\\u108D\\u108F-\\u109D\\u135D-\\u135F\\u170E-\\u1710\\u1720-\\u1730\\u1740-\\u1750\\u1772\\u1773\\u1780-\\u17B2\\u17DD\\u17E0-\\u17E9\\u180B-\\u180D\\u1810-\\u1819\\u1920-\\u192B\\u1930-\\u193B\\u1951-\\u196D\\u19B0-\\u19C0\\u19C8-\\u19C9\\u19D0-\\u19D9\\u1A00-\\u1A15\\u1A20-\\u1A53\\u1A60-\\u1A7C\\u1A7F-\\u1A89\\u1A90-\\u1A99\\u1B46-\\u1B4B\\u1B50-\\u1B59\\u1B6B-\\u1B73\\u1BB0-\\u1BB9\\u1BE6-\\u1BF3\\u1C00-\\u1C22\\u1C40-\\u1C49\\u1C5B-\\u1C7D\\u1CD0-\\u1CD2\\u1D00-\\u1DBE\\u1E01-\\u1F15\\u200C\\u200D\\u203F\\u2040\\u2054\\u20D0-\\u20DC\\u20E1\\u20E5-\\u20F0\\u2D81-\\u2D96\\u2DE0-\\u2DFF\\u3021-\\u3028\\u3099\\u309A\\uA640-\\uA66D\\uA674-\\uA67D\\uA69F\\uA6F0-\\uA6F1\\uA7F8-\\uA800\\uA806\\uA80B\\uA823-\\uA827\\uA880-\\uA881\\uA8B4-\\uA8C4\\uA8D0-\\uA8D9\\uA8F3-\\uA8F7\\uA900-\\uA909\\uA926-\\uA92D\\uA930-\\uA945\\uA980-\\uA983\\uA9B3-\\uA9C0\\uAA00-\\uAA27\\uAA40-\\uAA41\\uAA4C-\\uAA4D\\uAA50-\\uAA59\\uAA7B\\uAAE0-\\uAAE9\\uAAF2-\\uAAF3\\uABC0-\\uABE1\\uABEC\\uABED\\uABF0-\\uABF9\\uFB20-\\uFB28\\uFE00-\\uFE0F\\uFE20-\\uFE26\\uFE33\\uFE34\\uFE4D-\\uFE4F\\uFF10-\\uFF19\\uFF3F\";\n  var nonASCIIidentifierStart = new RegExp(\"[\" + nonASCIIidentifierStartChars + \"]\");\n  var nonASCIIidentifier = new RegExp(\"[\" + nonASCIIidentifierStartChars + nonASCIIidentifierChars + \"]\");\n\n  // Whether a single character denotes a newline.\n\n  var newline = /[\\n\\r\\u2028\\u2029]/;\n\n  // Matches a whole line break (where CRLF is considered a single\n  // line break). Used to count lines.\n\n  var lineBreak = /\\r\\n|[\\n\\r\\u2028\\u2029]/g;\n\n  // Test whether a given character code starts an identifier.\n\n  var isIdentifierStart = exports.isIdentifierStart = function (code) {\n    if (code < 65) return code === 36;\n    if (code < 91) return true;\n    if (code < 97) return code === 95;\n    if (code < 123) return true;\n    return code >= 0xaa && nonASCIIidentifierStart.test(String.fromCharCode(code));\n  };\n\n  // Test whether a given character is part of an identifier.\n\n  var isIdentifierChar = exports.isIdentifierChar = function (code) {\n    if (code < 48) return code === 36;\n    if (code < 58) return true;\n    if (code < 65) return false;\n    if (code < 91) return true;\n    if (code < 97) return code === 95;\n    if (code < 123) return true;\n    return code >= 0xaa && nonASCIIidentifier.test(String.fromCharCode(code));\n  };\n\n  // ## Tokenizer\n\n  // These are used when `options.locations` is on, for the\n  // `tokStartLoc` and `tokEndLoc` properties.\n\n  function line_loc_t() {\n    this.line = tokCurLine;\n    this.column = tokPos - tokLineStart;\n  }\n\n  // Reset the token state. Used at the start of a parse.\n\n  function initTokenState() {\n    tokCurLine = 1;\n    tokPos = tokLineStart = 0;\n    tokRegexpAllowed = true;\n    skipSpace();\n  }\n\n  // Called at the end of every token. Sets `tokEnd`, `tokVal`, and\n  // `tokRegexpAllowed`, and skips the space after the token, so that\n  // the next one's `tokStart` will point at the right position.\n\n  function finishToken(type, val) {\n    tokEnd = tokPos;\n    if (options.locations) tokEndLoc = new line_loc_t();\n    tokType = type;\n    skipSpace();\n    tokVal = val;\n    tokRegexpAllowed = type.beforeExpr;\n  }\n\n  function skipBlockComment() {\n    var startLoc = options.onComment && options.locations && new line_loc_t();\n    var start = tokPos,\n        end = input.indexOf(\"*/\", tokPos += 2);\n    if (end === -1) raise(tokPos - 2, \"Unterminated comment\");\n    tokPos = end + 2;\n    if (options.locations) {\n      lineBreak.lastIndex = start;\n      var match;\n      while ((match = lineBreak.exec(input)) && match.index < tokPos) {\n        ++tokCurLine;\n        tokLineStart = match.index + match[0].length;\n      }\n    }\n    if (options.onComment) options.onComment(true, input.slice(start + 2, end), start, tokPos, startLoc, options.locations && new line_loc_t());\n  }\n\n  function skipLineComment() {\n    var start = tokPos;\n    var startLoc = options.onComment && options.locations && new line_loc_t();\n    var ch = input.charCodeAt(tokPos += 2);\n    while (tokPos < inputLen && ch !== 10 && ch !== 13 && ch !== 8232 && ch !== 8233) {\n      ++tokPos;\n      ch = input.charCodeAt(tokPos);\n    }\n    if (options.onComment) options.onComment(false, input.slice(start + 2, tokPos), start, tokPos, startLoc, options.locations && new line_loc_t());\n  }\n\n  // Called at the start of the parse and after every token. Skips\n  // whitespace and comments, and.\n\n  function skipSpace() {\n    while (tokPos < inputLen) {\n      var ch = input.charCodeAt(tokPos);\n      if (ch === 32) {\n        // ' '\n        ++tokPos;\n      } else if (ch === 13) {\n        ++tokPos;\n        var next = input.charCodeAt(tokPos);\n        if (next === 10) {\n          ++tokPos;\n        }\n        if (options.locations) {\n          ++tokCurLine;\n          tokLineStart = tokPos;\n        }\n      } else if (ch === 10 || ch === 8232 || ch === 8233) {\n        ++tokPos;\n        if (options.locations) {\n          ++tokCurLine;\n          tokLineStart = tokPos;\n        }\n      } else if (ch > 8 && ch < 14) {\n        ++tokPos;\n      } else if (ch === 47) {\n        // '/'\n        var next = input.charCodeAt(tokPos + 1);\n        if (next === 42) {\n          // '*'\n          skipBlockComment();\n        } else if (next === 47) {\n          // '/'\n          skipLineComment();\n        } else break;\n      } else if (ch === 160) {\n        // '\\xa0'\n        ++tokPos;\n      } else if (ch >= 5760 && nonASCIIwhitespace.test(String.fromCharCode(ch))) {\n        ++tokPos;\n      } else {\n        break;\n      }\n    }\n  }\n\n  // ### Token reading\n\n  // This is the function that is called to fetch the next token. It\n  // is somewhat obscure, because it works in character codes rather\n  // than characters, and because operator parsing has been inlined\n  // into it.\n  //\n  // All in the name of speed.\n  //\n  // The `forceRegexp` parameter is used in the one case where the\n  // `tokRegexpAllowed` trick does not work. See `parseStatement`.\n\n  function readToken_dot() {\n    var next = input.charCodeAt(tokPos + 1);\n    if (next >= 48 && next <= 57) return readNumber(true);\n    ++tokPos;\n    return finishToken(_dot);\n  }\n\n  function readToken_slash() {\n    // '/'\n    var next = input.charCodeAt(tokPos + 1);\n    if (tokRegexpAllowed) {\n      ++tokPos;return readRegexp();\n    }\n    if (next === 61) return finishOp(_assign, 2);\n    return finishOp(_slash, 1);\n  }\n\n  function readToken_mult_modulo() {\n    // '%*'\n    var next = input.charCodeAt(tokPos + 1);\n    if (next === 61) return finishOp(_assign, 2);\n    return finishOp(_multiplyModulo, 1);\n  }\n\n  function readToken_pipe_amp(code) {\n    // '|&'\n    var next = input.charCodeAt(tokPos + 1);\n    if (next === code) return finishOp(code === 124 ? _logicalOR : _logicalAND, 2);\n    if (next === 61) return finishOp(_assign, 2);\n    return finishOp(code === 124 ? _bitwiseOR : _bitwiseAND, 1);\n  }\n\n  function readToken_caret() {\n    // '^'\n    var next = input.charCodeAt(tokPos + 1);\n    if (next === 61) return finishOp(_assign, 2);\n    return finishOp(_bitwiseXOR, 1);\n  }\n\n  function readToken_plus_min(code) {\n    // '+-'\n    var next = input.charCodeAt(tokPos + 1);\n    if (next === code) {\n      if (next == 45 && input.charCodeAt(tokPos + 2) == 62 && newline.test(input.slice(lastEnd, tokPos))) {\n        // A `-->` line comment\n        tokPos += 3;\n        skipLineComment();\n        skipSpace();\n        return readToken();\n      }\n      return finishOp(_incDec, 2);\n    }\n    if (next === 61) return finishOp(_assign, 2);\n    return finishOp(_plusMin, 1);\n  }\n\n  function readToken_lt_gt(code) {\n    // '<>'\n    var next = input.charCodeAt(tokPos + 1);\n    var size = 1;\n    if (next === code) {\n      size = code === 62 && input.charCodeAt(tokPos + 2) === 62 ? 3 : 2;\n      if (input.charCodeAt(tokPos + size) === 61) return finishOp(_assign, size + 1);\n      return finishOp(_bitShift, size);\n    }\n    if (next == 33 && code == 60 && input.charCodeAt(tokPos + 2) == 45 && input.charCodeAt(tokPos + 3) == 45) {\n      // `<!--`, an XML-style comment that should be interpreted as a line comment\n      tokPos += 4;\n      skipLineComment();\n      skipSpace();\n      return readToken();\n    }\n    if (next === 61) size = input.charCodeAt(tokPos + 2) === 61 ? 3 : 2;\n    return finishOp(_relational, size);\n  }\n\n  function readToken_eq_excl(code) {\n    // '=!'\n    var next = input.charCodeAt(tokPos + 1);\n    if (next === 61) return finishOp(_equality, input.charCodeAt(tokPos + 2) === 61 ? 3 : 2);\n    return finishOp(code === 61 ? _eq : _prefix, 1);\n  }\n\n  function getTokenFromCode(code) {\n    switch (code) {\n      // The interpretation of a dot depends on whether it is followed\n      // by a digit.\n      case 46:\n        // '.'\n        return readToken_dot();\n\n      // Punctuation tokens.\n      case 40:\n        ++tokPos;return finishToken(_parenL);\n      case 41:\n        ++tokPos;return finishToken(_parenR);\n      case 59:\n        ++tokPos;return finishToken(_semi);\n      case 44:\n        ++tokPos;return finishToken(_comma);\n      case 91:\n        ++tokPos;return finishToken(_bracketL);\n      case 93:\n        ++tokPos;return finishToken(_bracketR);\n      case 123:\n        ++tokPos;return finishToken(_braceL);\n      case 125:\n        ++tokPos;return finishToken(_braceR);\n      case 58:\n        ++tokPos;return finishToken(_colon);\n      case 63:\n        ++tokPos;return finishToken(_question);\n\n      // '0x' is a hexadecimal number.\n      case 48:\n        // '0'\n        var next = input.charCodeAt(tokPos + 1);\n        if (next === 120 || next === 88) return readHexNumber();\n      // Anything else beginning with a digit is an integer, octal\n      // number, or float.\n      case 49:case 50:case 51:case 52:case 53:case 54:case 55:case 56:case 57:\n        // 1-9\n        return readNumber(false);\n\n      // Quotes produce strings.\n      case 34:case 39:\n        // '\"', \"'\"\n        return readString(code);\n\n      // Operators are parsed inline in tiny state machines. '=' (61) is\n      // often referred to. `finishOp` simply skips the amount of\n      // characters it is given as second argument, and returns a token\n      // of the type given by its first argument.\n\n      case 47:\n        // '/'\n        return readToken_slash(code);\n\n      case 37:case 42:\n        // '%*'\n        return readToken_mult_modulo();\n\n      case 124:case 38:\n        // '|&'\n        return readToken_pipe_amp(code);\n\n      case 94:\n        // '^'\n        return readToken_caret();\n\n      case 43:case 45:\n        // '+-'\n        return readToken_plus_min(code);\n\n      case 60:case 62:\n        // '<>'\n        return readToken_lt_gt(code);\n\n      case 61:case 33:\n        // '=!'\n        return readToken_eq_excl(code);\n\n      case 126:\n        // '~'\n        return finishOp(_prefix, 1);\n    }\n\n    return false;\n  }\n\n  function readToken(forceRegexp) {\n    if (!forceRegexp) tokStart = tokPos;else tokPos = tokStart + 1;\n    if (options.locations) tokStartLoc = new line_loc_t();\n    if (forceRegexp) return readRegexp();\n    if (tokPos >= inputLen) return finishToken(_eof);\n\n    var code = input.charCodeAt(tokPos);\n    // Identifier or keyword. '\\uXXXX' sequences are allowed in\n    // identifiers, so '\\' also dispatches to that.\n    if (isIdentifierStart(code) || code === 92 /* '\\' */) return readWord();\n\n    var tok = getTokenFromCode(code);\n\n    if (tok === false) {\n      // If we are here, we either found a non-ASCII identifier\n      // character, or something that's entirely disallowed.\n      var ch = String.fromCharCode(code);\n      if (ch === \"\\\\\" || nonASCIIidentifierStart.test(ch)) return readWord();\n      raise(tokPos, \"Unexpected character '\" + ch + \"'\");\n    }\n    return tok;\n  }\n\n  function finishOp(type, size) {\n    var str = input.slice(tokPos, tokPos + size);\n    tokPos += size;\n    finishToken(type, str);\n  }\n\n  // Parse a regular expression. Some context-awareness is necessary,\n  // since a '/' inside a '[]' set does not end the expression.\n\n  function readRegexp() {\n    var content = \"\",\n        escaped,\n        inClass,\n        start = tokPos;\n    for (;;) {\n      if (tokPos >= inputLen) raise(start, \"Unterminated regular expression\");\n      var ch = input.charAt(tokPos);\n      if (newline.test(ch)) raise(start, \"Unterminated regular expression\");\n      if (!escaped) {\n        if (ch === \"[\") inClass = true;else if (ch === \"]\" && inClass) inClass = false;else if (ch === \"/\" && !inClass) break;\n        escaped = ch === \"\\\\\";\n      } else escaped = false;\n      ++tokPos;\n    }\n    var content = input.slice(start, tokPos);\n    ++tokPos;\n    // Need to use `readWord1` because '\\uXXXX' sequences are allowed\n    // here (don't ask).\n    var mods = readWord1();\n    if (mods && !/^[gmsiy]*$/.test(mods)) raise(start, \"Invalid regexp flag\");\n    return finishToken(_regexp, new RegExp(content, mods));\n  }\n\n  // Read an integer in the given radix. Return null if zero digits\n  // were read, the integer value otherwise. When `len` is given, this\n  // will return `null` unless the integer has exactly `len` digits.\n\n  function readInt(radix, len) {\n    var start = tokPos,\n        total = 0;\n    for (var i = 0, e = len == null ? Infinity : len; i < e; ++i) {\n      var code = input.charCodeAt(tokPos),\n          val;\n      if (code >= 97) val = code - 97 + 10; // a\n      else if (code >= 65) val = code - 65 + 10; // A\n        else if (code >= 48 && code <= 57) val = code - 48; // 0-9\n          else val = Infinity;\n      if (val >= radix) break;\n      ++tokPos;\n      total = total * radix + val;\n    }\n    if (tokPos === start || len != null && tokPos - start !== len) return null;\n\n    return total;\n  }\n\n  function readHexNumber() {\n    tokPos += 2; // 0x\n    var val = readInt(16);\n    if (val == null) raise(tokStart + 2, \"Expected hexadecimal number\");\n    if (isIdentifierStart(input.charCodeAt(tokPos))) raise(tokPos, \"Identifier directly after number\");\n    return finishToken(_num, val);\n  }\n\n  // Read an integer, octal integer, or floating-point number.\n\n  function readNumber(startsWithDot) {\n    var start = tokPos,\n        isFloat = false,\n        octal = input.charCodeAt(tokPos) === 48;\n    if (!startsWithDot && readInt(10) === null) raise(start, \"Invalid number\");\n    if (input.charCodeAt(tokPos) === 46) {\n      ++tokPos;\n      readInt(10);\n      isFloat = true;\n    }\n    var next = input.charCodeAt(tokPos);\n    if (next === 69 || next === 101) {\n      // 'eE'\n      next = input.charCodeAt(++tokPos);\n      if (next === 43 || next === 45) ++tokPos; // '+-'\n      if (readInt(10) === null) raise(start, \"Invalid number\");\n      isFloat = true;\n    }\n    if (isIdentifierStart(input.charCodeAt(tokPos))) raise(tokPos, \"Identifier directly after number\");\n\n    var str = input.slice(start, tokPos),\n        val;\n    if (isFloat) val = parseFloat(str);else if (!octal || str.length === 1) val = parseInt(str, 10);else if (/[89]/.test(str) || strict) raise(start, \"Invalid number\");else val = parseInt(str, 8);\n    return finishToken(_num, val);\n  }\n\n  // Read a string value, interpreting backslash-escapes.\n\n  function readString(quote) {\n    tokPos++;\n    var out = \"\";\n    for (;;) {\n      if (tokPos >= inputLen) raise(tokStart, \"Unterminated string constant\");\n      var ch = input.charCodeAt(tokPos);\n      if (ch === quote) {\n        ++tokPos;\n        return finishToken(_string, out);\n      }\n      if (ch === 92) {\n        // '\\'\n        ch = input.charCodeAt(++tokPos);\n        var octal = /^[0-7]+/.exec(input.slice(tokPos, tokPos + 3));\n        if (octal) octal = octal[0];\n        while (octal && parseInt(octal, 8) > 255) {\n          octal = octal.slice(0, -1);\n        }if (octal === \"0\") octal = null;\n        ++tokPos;\n        if (octal) {\n          if (strict) raise(tokPos - 2, \"Octal literal in strict mode\");\n          out += String.fromCharCode(parseInt(octal, 8));\n          tokPos += octal.length - 1;\n        } else {\n          switch (ch) {\n            case 110:\n              out += \"\\n\";break; // 'n' -> '\\n'\n            case 114:\n              out += \"\\r\";break; // 'r' -> '\\r'\n            case 120:\n              out += String.fromCharCode(readHexChar(2));break; // 'x'\n            case 117:\n              out += String.fromCharCode(readHexChar(4));break; // 'u'\n            case 85:\n              out += String.fromCharCode(readHexChar(8));break; // 'U'\n            case 116:\n              out += \"\\t\";break; // 't' -> '\\t'\n            case 98:\n              out += \"\\b\";break; // 'b' -> '\\b'\n            case 118:\n              out += \"\\x0B\";break; // 'v' -> '\\u000b'\n            case 102:\n              out += \"\\f\";break; // 'f' -> '\\f'\n            case 48:\n              out += \"\\0\";break; // 0 -> '\\0'\n            case 13:\n              if (input.charCodeAt(tokPos) === 10) ++tokPos; // '\\r\\n'\n            case 10:\n              // ' \\n'\n              if (options.locations) {\n                tokLineStart = tokPos;++tokCurLine;\n              }\n              break;\n            default:\n              out += String.fromCharCode(ch);break;\n          }\n        }\n      } else {\n        if (ch === 13 || ch === 10 || ch === 8232 || ch === 8233) raise(tokStart, \"Unterminated string constant\");\n        out += String.fromCharCode(ch); // '\\'\n        ++tokPos;\n      }\n    }\n  }\n\n  // Used to read character escape sequences ('\\x', '\\u', '\\U').\n\n  function readHexChar(len) {\n    var n = readInt(16, len);\n    if (n === null) raise(tokStart, \"Bad character escape sequence\");\n    return n;\n  }\n\n  // Used to signal to callers of `readWord1` whether the word\n  // contained any escape sequences. This is needed because words with\n  // escape sequences must not be interpreted as keywords.\n\n  var containsEsc;\n\n  // Read an identifier, and return it as a string. Sets `containsEsc`\n  // to whether the word contained a '\\u' escape.\n  //\n  // Only builds up the word character-by-character when it actually\n  // containeds an escape, as a micro-optimization.\n\n  function readWord1() {\n    containsEsc = false;\n    var word,\n        first = true,\n        start = tokPos;\n    for (;;) {\n      var ch = input.charCodeAt(tokPos);\n      if (isIdentifierChar(ch)) {\n        if (containsEsc) word += input.charAt(tokPos);\n        ++tokPos;\n      } else if (ch === 92) {\n        // \"\\\"\n        if (!containsEsc) word = input.slice(start, tokPos);\n        containsEsc = true;\n        if (input.charCodeAt(++tokPos) != 117) // \"u\"\n          raise(tokPos, \"Expecting Unicode escape sequence \\\\uXXXX\");\n        ++tokPos;\n        var esc = readHexChar(4);\n        var escStr = String.fromCharCode(esc);\n        if (!escStr) raise(tokPos - 1, \"Invalid Unicode escape\");\n        if (!(first ? isIdentifierStart(esc) : isIdentifierChar(esc))) raise(tokPos - 4, \"Invalid Unicode escape\");\n        word += escStr;\n      } else {\n        break;\n      }\n      first = false;\n    }\n    return containsEsc ? word : input.slice(start, tokPos);\n  }\n\n  // Read an identifier or keyword token. Will check for reserved\n  // words when necessary.\n\n  function readWord() {\n    var word = readWord1();\n    var type = _name;\n    if (!containsEsc) {\n      if (isKeyword(word)) type = keywordTypes[word];else if (options.forbidReserved && (options.ecmaVersion === 3 ? isReservedWord3 : isReservedWord5)(word) || strict && isStrictReservedWord(word)) raise(tokStart, \"The keyword '\" + word + \"' is reserved\");\n    }\n    return finishToken(type, word);\n  }\n\n  // ## Parser\n\n  // A recursive descent parser operates by defining functions for all\n  // syntactic elements, and recursively calling those, each function\n  // advancing the input stream and returning an AST node. Precedence\n  // of constructs (for example, the fact that `!x[1]` means `!(x[1])`\n  // instead of `(!x)[1]` is handled by the fact that the parser\n  // function that parses unary prefix operators is called first, and\n  // in turn calls the function that parses `[]` subscripts — that\n  // way, it'll receive the node for `x[1]` already parsed, and wraps\n  // *that* in the unary operator node.\n  //\n  // Acorn uses an [operator precedence parser][opp] to handle binary\n  // operator precedence, because it is much more compact than using\n  // the technique outlined above, which uses different, nesting\n  // functions to specify precedence, for all of the ten binary\n  // precedence levels that JavaScript defines.\n  //\n  // [opp]: http://en.wikipedia.org/wiki/Operator-precedence_parser\n\n  // ### Parser utilities\n\n  // Continue to the next token.\n\n  function next() {\n    lastStart = tokStart;\n    lastEnd = tokEnd;\n    lastEndLoc = tokEndLoc;\n    readToken();\n  }\n\n  // Enter strict mode. Re-reads the next token to please pedantic\n  // tests (\"use strict\"; 010; -- should fail).\n\n  function setStrict(strct) {\n    strict = strct;\n    tokPos = lastEnd;\n    if (options.locations) {\n      while (tokPos < tokLineStart) {\n        tokLineStart = input.lastIndexOf(\"\\n\", tokLineStart - 2) + 1;\n        --tokCurLine;\n      }\n    }\n    skipSpace();\n    readToken();\n  }\n\n  // Start an AST node, attaching a start offset.\n\n  function node_t() {\n    this.type = null;\n    this.start = tokStart;\n    this.end = null;\n  }\n\n  function node_loc_t() {\n    this.start = tokStartLoc;\n    this.end = null;\n    if (sourceFile !== null) this.source = sourceFile;\n  }\n\n  function startNode() {\n    var node = new node_t();\n    if (options.locations) node.loc = new node_loc_t();\n    if (options.directSourceFile) node.sourceFile = options.directSourceFile;\n    if (options.ranges) node.range = [tokStart, 0];\n    return node;\n  }\n\n  // Start a node whose start offset information should be based on\n  // the start of another node. For example, a binary operator node is\n  // only started after its left-hand side has already been parsed.\n\n  function startNodeFrom(other) {\n    var node = new node_t();\n    node.start = other.start;\n    if (options.locations) {\n      node.loc = new node_loc_t();\n      node.loc.start = other.loc.start;\n    }\n    if (options.ranges) node.range = [other.range[0], 0];\n\n    return node;\n  }\n\n  // Finish an AST node, adding `type` and `end` properties.\n\n  function finishNode(node, type) {\n    node.type = type;\n    node.end = lastEnd;\n    if (options.locations) node.loc.end = lastEndLoc;\n    if (options.ranges) node.range[1] = lastEnd;\n    return node;\n  }\n\n  // Test whether a statement node is the string literal `\"use strict\"`.\n\n  function isUseStrict(stmt) {\n    return options.ecmaVersion >= 5 && stmt.type === \"ExpressionStatement\" && stmt.expression.type === \"Literal\" && stmt.expression.value === \"use strict\";\n  }\n\n  // Predicate that tests whether the next token is of the given\n  // type, and if yes, consumes it as a side effect.\n\n  function eat(type) {\n    if (tokType === type) {\n      next();\n      return true;\n    }\n  }\n\n  // Test whether a semicolon can be inserted at the current position.\n\n  function canInsertSemicolon() {\n    return !options.strictSemicolons && (tokType === _eof || tokType === _braceR || newline.test(input.slice(lastEnd, tokStart)));\n  }\n\n  // Consume a semicolon, or, failing that, see if we are allowed to\n  // pretend that there is a semicolon at this position.\n\n  function semicolon() {\n    if (!eat(_semi) && !canInsertSemicolon()) unexpected();\n  }\n\n  // Expect a token of a given type. If found, consume it, otherwise,\n  // raise an unexpected token error.\n\n  function expect(type) {\n    if (tokType === type) next();else unexpected();\n  }\n\n  // Raise an unexpected token error.\n\n  function unexpected() {\n    raise(tokStart, \"Unexpected token\");\n  }\n\n  // Verify that a node is an lval — something that can be assigned\n  // to.\n\n  function checkLVal(expr) {\n    if (expr.type !== \"Identifier\" && expr.type !== \"MemberExpression\") raise(expr.start, \"Assigning to rvalue\");\n    if (strict && expr.type === \"Identifier\" && isStrictBadIdWord(expr.name)) raise(expr.start, \"Assigning to \" + expr.name + \" in strict mode\");\n  }\n\n  // ### Statement parsing\n\n  // Parse a program. Initializes the parser, reads any number of\n  // statements, and wraps them in a Program node.  Optionally takes a\n  // `program` argument.  If present, the statements will be appended\n  // to its body instead of creating a new node.\n\n  function parseTopLevel(program) {\n    lastStart = lastEnd = tokPos;\n    if (options.locations) lastEndLoc = new line_loc_t();\n    inFunction = strict = null;\n    labels = [];\n    readToken();\n\n    var node = program || startNode(),\n        first = true;\n    if (!program) node.body = [];\n    while (tokType !== _eof) {\n      var stmt = parseStatement();\n      node.body.push(stmt);\n      if (first && isUseStrict(stmt)) setStrict(true);\n      first = false;\n    }\n    return finishNode(node, \"Program\");\n  }\n\n  var loopLabel = { kind: \"loop\" },\n      switchLabel = { kind: \"switch\" };\n\n  // Parse a single statement.\n  //\n  // If expecting a statement and finding a slash operator, parse a\n  // regular expression literal. This is to handle cases like\n  // `if (foo) /blah/.exec(foo);`, where looking at the previous token\n  // does not help.\n\n  function parseStatement() {\n    if (tokType === _slash || tokType === _assign && tokVal == \"/=\") readToken(true);\n\n    var starttype = tokType,\n        node = startNode();\n\n    // Most types of statements are recognized by the keyword they\n    // start with. Many are trivial to parse, some require a bit of\n    // complexity.\n\n    switch (starttype) {\n      case _break:case _continue:\n        next();\n        var isBreak = starttype === _break;\n        if (eat(_semi) || canInsertSemicolon()) node.label = null;else if (tokType !== _name) unexpected();else {\n          node.label = parseIdent();\n          semicolon();\n        }\n\n        // Verify that there is an actual destination to break or\n        // continue to.\n        for (var i = 0; i < labels.length; ++i) {\n          var lab = labels[i];\n          if (node.label == null || lab.name === node.label.name) {\n            if (lab.kind != null && (isBreak || lab.kind === \"loop\")) break;\n            if (node.label && isBreak) break;\n          }\n        }\n        if (i === labels.length) raise(node.start, \"Unsyntactic \" + starttype.keyword);\n        return finishNode(node, isBreak ? \"BreakStatement\" : \"ContinueStatement\");\n\n      case _debugger:\n        next();\n        semicolon();\n        return finishNode(node, \"DebuggerStatement\");\n\n      case _do:\n        next();\n        labels.push(loopLabel);\n        node.body = parseStatement();\n        labels.pop();\n        expect(_while);\n        node.test = parseParenExpression();\n        semicolon();\n        return finishNode(node, \"DoWhileStatement\");\n\n      // Disambiguating between a `for` and a `for`/`in` loop is\n      // non-trivial. Basically, we have to parse the init `var`\n      // statement or expression, disallowing the `in` operator (see\n      // the second parameter to `parseExpression`), and then check\n      // whether the next token is `in`. When there is no init part\n      // (semicolon immediately after the opening parenthesis), it is\n      // a regular `for` loop.\n\n      case _for:\n        next();\n        labels.push(loopLabel);\n        expect(_parenL);\n        if (tokType === _semi) return parseFor(node, null);\n        if (tokType === _var) {\n          var init = startNode();\n          next();\n          parseVar(init, true);\n          finishNode(init, \"VariableDeclaration\");\n          if (init.declarations.length === 1 && eat(_in)) return parseForIn(node, init);\n          return parseFor(node, init);\n        }\n        var init = parseExpression(false, true);\n        if (eat(_in)) {\n          checkLVal(init);return parseForIn(node, init);\n        }\n        return parseFor(node, init);\n\n      case _function:\n        next();\n        return parseFunction(node, true);\n\n      case _if:\n        next();\n        node.test = parseParenExpression();\n        node.consequent = parseStatement();\n        node.alternate = eat(_else) ? parseStatement() : null;\n        return finishNode(node, \"IfStatement\");\n\n      case _return:\n        if (!inFunction) raise(tokStart, \"'return' outside of function\");\n        next();\n\n        // In `return` (and `break`/`continue`), the keywords with\n        // optional arguments, we eagerly look for a semicolon or the\n        // possibility to insert one.\n\n        if (eat(_semi) || canInsertSemicolon()) node.argument = null;else {\n          node.argument = parseExpression();semicolon();\n        }\n        return finishNode(node, \"ReturnStatement\");\n\n      case _switch:\n        next();\n        node.discriminant = parseParenExpression();\n        node.cases = [];\n        expect(_braceL);\n        labels.push(switchLabel);\n\n        // Statements under must be grouped (by label) in SwitchCase\n        // nodes. `cur` is used to keep the node that we are currently\n        // adding statements to.\n\n        for (var cur, sawDefault; tokType != _braceR;) {\n          if (tokType === _case || tokType === _default) {\n            var isCase = tokType === _case;\n            if (cur) finishNode(cur, \"SwitchCase\");\n            node.cases.push(cur = startNode());\n            cur.consequent = [];\n            next();\n            if (isCase) cur.test = parseExpression();else {\n              if (sawDefault) raise(lastStart, \"Multiple default clauses\");sawDefault = true;\n              cur.test = null;\n            }\n            expect(_colon);\n          } else {\n            if (!cur) unexpected();\n            cur.consequent.push(parseStatement());\n          }\n        }\n        if (cur) finishNode(cur, \"SwitchCase\");\n        next(); // Closing brace\n        labels.pop();\n        return finishNode(node, \"SwitchStatement\");\n\n      case _throw:\n        next();\n        if (newline.test(input.slice(lastEnd, tokStart))) raise(lastEnd, \"Illegal newline after throw\");\n        node.argument = parseExpression();\n        semicolon();\n        return finishNode(node, \"ThrowStatement\");\n\n      case _try:\n        next();\n        node.block = parseBlock();\n        node.handler = null;\n        if (tokType === _catch) {\n          var clause = startNode();\n          next();\n          expect(_parenL);\n          clause.param = parseIdent();\n          if (strict && isStrictBadIdWord(clause.param.name)) raise(clause.param.start, \"Binding \" + clause.param.name + \" in strict mode\");\n          expect(_parenR);\n          clause.guard = null;\n          clause.body = parseBlock();\n          node.handler = finishNode(clause, \"CatchClause\");\n        }\n        node.guardedHandlers = empty;\n        node.finalizer = eat(_finally) ? parseBlock() : null;\n        if (!node.handler && !node.finalizer) raise(node.start, \"Missing catch or finally clause\");\n        return finishNode(node, \"TryStatement\");\n\n      case _var:\n        next();\n        parseVar(node);\n        semicolon();\n        return finishNode(node, \"VariableDeclaration\");\n\n      case _while:\n        next();\n        node.test = parseParenExpression();\n        labels.push(loopLabel);\n        node.body = parseStatement();\n        labels.pop();\n        return finishNode(node, \"WhileStatement\");\n\n      case _with:\n        if (strict) raise(tokStart, \"'with' in strict mode\");\n        next();\n        node.object = parseParenExpression();\n        node.body = parseStatement();\n        return finishNode(node, \"WithStatement\");\n\n      case _braceL:\n        return parseBlock();\n\n      case _semi:\n        next();\n        return finishNode(node, \"EmptyStatement\");\n\n      // If the statement does not start with a statement keyword or a\n      // brace, it's an ExpressionStatement or LabeledStatement. We\n      // simply start parsing an expression, and afterwards, if the\n      // next token is a colon and the expression was a simple\n      // Identifier node, we switch to interpreting it as a label.\n\n      default:\n        var maybeName = tokVal,\n            expr = parseExpression();\n        if (starttype === _name && expr.type === \"Identifier\" && eat(_colon)) {\n          for (var i = 0; i < labels.length; ++i) {\n            if (labels[i].name === maybeName) raise(expr.start, \"Label '\" + maybeName + \"' is already declared\");\n          }var kind = tokType.isLoop ? \"loop\" : tokType === _switch ? \"switch\" : null;\n          labels.push({ name: maybeName, kind: kind });\n          node.body = parseStatement();\n          labels.pop();\n          node.label = expr;\n          return finishNode(node, \"LabeledStatement\");\n        } else {\n          node.expression = expr;\n          semicolon();\n          return finishNode(node, \"ExpressionStatement\");\n        }\n    }\n  }\n\n  // Used for constructs like `switch` and `if` that insist on\n  // parentheses around their expression.\n\n  function parseParenExpression() {\n    expect(_parenL);\n    var val = parseExpression();\n    expect(_parenR);\n    return val;\n  }\n\n  // Parse a semicolon-enclosed block of statements, handling `\"use\n  // strict\"` declarations when `allowStrict` is true (used for\n  // function bodies).\n\n  function parseBlock(allowStrict) {\n    var node = startNode(),\n        first = true,\n        strict = false,\n        oldStrict;\n    node.body = [];\n    expect(_braceL);\n    while (!eat(_braceR)) {\n      var stmt = parseStatement();\n      node.body.push(stmt);\n      if (first && allowStrict && isUseStrict(stmt)) {\n        oldStrict = strict;\n        setStrict(strict = true);\n      }\n      first = false;\n    }\n    if (strict && !oldStrict) setStrict(false);\n    return finishNode(node, \"BlockStatement\");\n  }\n\n  // Parse a regular `for` loop. The disambiguation code in\n  // `parseStatement` will already have parsed the init statement or\n  // expression.\n\n  function parseFor(node, init) {\n    node.init = init;\n    expect(_semi);\n    node.test = tokType === _semi ? null : parseExpression();\n    expect(_semi);\n    node.update = tokType === _parenR ? null : parseExpression();\n    expect(_parenR);\n    node.body = parseStatement();\n    labels.pop();\n    return finishNode(node, \"ForStatement\");\n  }\n\n  // Parse a `for`/`in` loop.\n\n  function parseForIn(node, init) {\n    node.left = init;\n    node.right = parseExpression();\n    expect(_parenR);\n    node.body = parseStatement();\n    labels.pop();\n    return finishNode(node, \"ForInStatement\");\n  }\n\n  // Parse a list of variable declarations.\n\n  function parseVar(node, noIn) {\n    node.declarations = [];\n    node.kind = \"var\";\n    for (;;) {\n      var decl = startNode();\n      decl.id = parseIdent();\n      if (strict && isStrictBadIdWord(decl.id.name)) raise(decl.id.start, \"Binding \" + decl.id.name + \" in strict mode\");\n      decl.init = eat(_eq) ? parseExpression(true, noIn) : null;\n      node.declarations.push(finishNode(decl, \"VariableDeclarator\"));\n      if (!eat(_comma)) break;\n    }\n    return node;\n  }\n\n  // ### Expression parsing\n\n  // These nest, from the most general expression type at the top to\n  // 'atomic', nondivisible expression types at the bottom. Most of\n  // the functions will simply let the function(s) below them parse,\n  // and, *if* the syntactic construct they handle is present, wrap\n  // the AST node that the inner parser gave them in another node.\n\n  // Parse a full expression. The arguments are used to forbid comma\n  // sequences (in argument lists, array literals, or object literals)\n  // or the `in` operator (in for loops initalization expressions).\n\n  function parseExpression(noComma, noIn) {\n    var expr = parseMaybeAssign(noIn);\n    if (!noComma && tokType === _comma) {\n      var node = startNodeFrom(expr);\n      node.expressions = [expr];\n      while (eat(_comma)) {\n        node.expressions.push(parseMaybeAssign(noIn));\n      }return finishNode(node, \"SequenceExpression\");\n    }\n    return expr;\n  }\n\n  // Parse an assignment expression. This includes applications of\n  // operators like `+=`.\n\n  function parseMaybeAssign(noIn) {\n    var left = parseMaybeConditional(noIn);\n    if (tokType.isAssign) {\n      var node = startNodeFrom(left);\n      node.operator = tokVal;\n      node.left = left;\n      next();\n      node.right = parseMaybeAssign(noIn);\n      checkLVal(left);\n      return finishNode(node, \"AssignmentExpression\");\n    }\n    return left;\n  }\n\n  // Parse a ternary conditional (`?:`) operator.\n\n  function parseMaybeConditional(noIn) {\n    var expr = parseExprOps(noIn);\n    if (eat(_question)) {\n      var node = startNodeFrom(expr);\n      node.test = expr;\n      node.consequent = parseExpression(true);\n      expect(_colon);\n      node.alternate = parseExpression(true, noIn);\n      return finishNode(node, \"ConditionalExpression\");\n    }\n    return expr;\n  }\n\n  // Start the precedence parser.\n\n  function parseExprOps(noIn) {\n    return parseExprOp(parseMaybeUnary(), -1, noIn);\n  }\n\n  // Parse binary operators with the operator precedence parsing\n  // algorithm. `left` is the left-hand side of the operator.\n  // `minPrec` provides context that allows the function to stop and\n  // defer further parser to one of its callers when it encounters an\n  // operator that has a lower precedence than the set it is parsing.\n\n  function parseExprOp(left, minPrec, noIn) {\n    var prec = tokType.binop;\n    if (prec != null && (!noIn || tokType !== _in)) {\n      if (prec > minPrec) {\n        var node = startNodeFrom(left);\n        node.left = left;\n        node.operator = tokVal;\n        var op = tokType;\n        next();\n        node.right = parseExprOp(parseMaybeUnary(), prec, noIn);\n        var exprNode = finishNode(node, op === _logicalOR || op === _logicalAND ? \"LogicalExpression\" : \"BinaryExpression\");\n        return parseExprOp(exprNode, minPrec, noIn);\n      }\n    }\n    return left;\n  }\n\n  // Parse unary operators, both prefix and postfix.\n\n  function parseMaybeUnary() {\n    if (tokType.prefix) {\n      var node = startNode(),\n          update = tokType.isUpdate;\n      node.operator = tokVal;\n      node.prefix = true;\n      tokRegexpAllowed = true;\n      next();\n      node.argument = parseMaybeUnary();\n      if (update) checkLVal(node.argument);else if (strict && node.operator === \"delete\" && node.argument.type === \"Identifier\") raise(node.start, \"Deleting local variable in strict mode\");\n      return finishNode(node, update ? \"UpdateExpression\" : \"UnaryExpression\");\n    }\n    var expr = parseExprSubscripts();\n    while (tokType.postfix && !canInsertSemicolon()) {\n      var node = startNodeFrom(expr);\n      node.operator = tokVal;\n      node.prefix = false;\n      node.argument = expr;\n      checkLVal(expr);\n      next();\n      expr = finishNode(node, \"UpdateExpression\");\n    }\n    return expr;\n  }\n\n  // Parse call, dot, and `[]`-subscript expressions.\n\n  function parseExprSubscripts() {\n    return parseSubscripts(parseExprAtom());\n  }\n\n  function parseSubscripts(base, noCalls) {\n    if (eat(_dot)) {\n      var node = startNodeFrom(base);\n      node.object = base;\n      node.property = parseIdent(true);\n      node.computed = false;\n      return parseSubscripts(finishNode(node, \"MemberExpression\"), noCalls);\n    } else if (eat(_bracketL)) {\n      var node = startNodeFrom(base);\n      node.object = base;\n      node.property = parseExpression();\n      node.computed = true;\n      expect(_bracketR);\n      return parseSubscripts(finishNode(node, \"MemberExpression\"), noCalls);\n    } else if (!noCalls && eat(_parenL)) {\n      var node = startNodeFrom(base);\n      node.callee = base;\n      node.arguments = parseExprList(_parenR, false);\n      return parseSubscripts(finishNode(node, \"CallExpression\"), noCalls);\n    } else return base;\n  }\n\n  // Parse an atomic expression — either a single token that is an\n  // expression, an expression started by a keyword like `function` or\n  // `new`, or an expression wrapped in punctuation like `()`, `[]`,\n  // or `{}`.\n\n  function parseExprAtom() {\n    switch (tokType) {\n      case _this:\n        var node = startNode();\n        next();\n        return finishNode(node, \"ThisExpression\");\n      case _name:\n        return parseIdent();\n      case _num:case _string:case _regexp:\n        var node = startNode();\n        node.value = tokVal;\n        node.raw = input.slice(tokStart, tokEnd);\n        next();\n        return finishNode(node, \"Literal\");\n\n      case _null:case _true:case _false:\n        var node = startNode();\n        node.value = tokType.atomValue;\n        node.raw = tokType.keyword;\n        next();\n        return finishNode(node, \"Literal\");\n\n      case _parenL:\n        var tokStartLoc1 = tokStartLoc,\n            tokStart1 = tokStart;\n        next();\n        var val = parseExpression();\n        val.start = tokStart1;\n        val.end = tokEnd;\n        if (options.locations) {\n          val.loc.start = tokStartLoc1;\n          val.loc.end = tokEndLoc;\n        }\n        if (options.ranges) val.range = [tokStart1, tokEnd];\n        expect(_parenR);\n        return val;\n\n      case _bracketL:\n        var node = startNode();\n        next();\n        node.elements = parseExprList(_bracketR, true, true);\n        return finishNode(node, \"ArrayExpression\");\n\n      case _braceL:\n        return parseObj();\n\n      case _function:\n        var node = startNode();\n        next();\n        return parseFunction(node, false);\n\n      case _new:\n        return parseNew();\n\n      default:\n        unexpected();\n    }\n  }\n\n  // New's precedence is slightly tricky. It must allow its argument\n  // to be a `[]` or dot subscript expression, but not a call — at\n  // least, not without wrapping it in parentheses. Thus, it uses the\n\n  function parseNew() {\n    var node = startNode();\n    next();\n    node.callee = parseSubscripts(parseExprAtom(), true);\n    if (eat(_parenL)) node.arguments = parseExprList(_parenR, false);else node.arguments = empty;\n    return finishNode(node, \"NewExpression\");\n  }\n\n  // Parse an object literal.\n\n  function parseObj() {\n    var node = startNode(),\n        first = true,\n        sawGetSet = false;\n    node.properties = [];\n    next();\n    while (!eat(_braceR)) {\n      if (!first) {\n        expect(_comma);\n        if (options.allowTrailingCommas && eat(_braceR)) break;\n      } else first = false;\n\n      var prop = { key: parsePropertyName() },\n          isGetSet = false,\n          kind;\n      if (eat(_colon)) {\n        prop.value = parseExpression(true);\n        kind = prop.kind = \"init\";\n      } else if (options.ecmaVersion >= 5 && prop.key.type === \"Identifier\" && (prop.key.name === \"get\" || prop.key.name === \"set\")) {\n        isGetSet = sawGetSet = true;\n        kind = prop.kind = prop.key.name;\n        prop.key = parsePropertyName();\n        if (tokType !== _parenL) unexpected();\n        prop.value = parseFunction(startNode(), false);\n      } else unexpected();\n\n      // getters and setters are not allowed to clash — either with\n      // each other or with an init property — and in strict mode,\n      // init properties are also not allowed to be repeated.\n\n      if (prop.key.type === \"Identifier\" && (strict || sawGetSet)) {\n        for (var i = 0; i < node.properties.length; ++i) {\n          var other = node.properties[i];\n          if (other.key.name === prop.key.name) {\n            var conflict = kind == other.kind || isGetSet && other.kind === \"init\" || kind === \"init\" && (other.kind === \"get\" || other.kind === \"set\");\n            if (conflict && !strict && kind === \"init\" && other.kind === \"init\") conflict = false;\n            if (conflict) raise(prop.key.start, \"Redefinition of property\");\n          }\n        }\n      }\n      node.properties.push(prop);\n    }\n    return finishNode(node, \"ObjectExpression\");\n  }\n\n  function parsePropertyName() {\n    if (tokType === _num || tokType === _string) return parseExprAtom();\n    return parseIdent(true);\n  }\n\n  // Parse a function declaration or literal (depending on the\n  // `isStatement` parameter).\n\n  function parseFunction(node, isStatement) {\n    if (tokType === _name) node.id = parseIdent();else if (isStatement) unexpected();else node.id = null;\n    node.params = [];\n    var first = true;\n    expect(_parenL);\n    while (!eat(_parenR)) {\n      if (!first) expect(_comma);else first = false;\n      node.params.push(parseIdent());\n    }\n\n    // Start a new scope with regard to labels and the `inFunction`\n    // flag (restore them to their old value afterwards).\n    var oldInFunc = inFunction,\n        oldLabels = labels;\n    inFunction = true;labels = [];\n    node.body = parseBlock(true);\n    inFunction = oldInFunc;labels = oldLabels;\n\n    // If this is a strict mode function, verify that argument names\n    // are not repeated, and it does not try to bind the words `eval`\n    // or `arguments`.\n    if (strict || node.body.body.length && isUseStrict(node.body.body[0])) {\n      for (var i = node.id ? -1 : 0; i < node.params.length; ++i) {\n        var id = i < 0 ? node.id : node.params[i];\n        if (isStrictReservedWord(id.name) || isStrictBadIdWord(id.name)) raise(id.start, \"Defining '\" + id.name + \"' in strict mode\");\n        if (i >= 0) for (var j = 0; j < i; ++j) {\n          if (id.name === node.params[j].name) raise(id.start, \"Argument name clash in strict mode\");\n        }\n      }\n    }\n\n    return finishNode(node, isStatement ? \"FunctionDeclaration\" : \"FunctionExpression\");\n  }\n\n  // Parses a comma-separated list of expressions, and returns them as\n  // an array. `close` is the token type that ends the list, and\n  // `allowEmpty` can be turned on to allow subsequent commas with\n  // nothing in between them to be parsed as `null` (which is needed\n  // for array literals).\n\n  function parseExprList(close, allowTrailingComma, allowEmpty) {\n    var elts = [],\n        first = true;\n    while (!eat(close)) {\n      if (!first) {\n        expect(_comma);\n        if (allowTrailingComma && options.allowTrailingCommas && eat(close)) break;\n      } else first = false;\n\n      if (allowEmpty && tokType === _comma) elts.push(null);else elts.push(parseExpression(true));\n    }\n    return elts;\n  }\n\n  // Parse the next token as an identifier. If `liberal` is true (used\n  // when parsing properties), it will also convert keywords into\n  // identifiers.\n\n  function parseIdent(liberal) {\n    var node = startNode();\n    node.name = tokType === _name ? tokVal : liberal && !options.forbidReserved && tokType.keyword || unexpected();\n    tokRegexpAllowed = false;\n    next();\n    return finishNode(node, \"Identifier\");\n  }\n});\n/* WEBPACK VAR INJECTION */}.call(exports, __webpack_require__(3)(module)))\n\n/***/ }),\n/* 3 */\n/***/ (function(module, exports) {\n\nmodule.exports = function(module) {\r\n\tif(!module.webpackPolyfill) {\r\n\t\tmodule.deprecate = function() {};\r\n\t\tmodule.paths = [];\r\n\t\t// module.parent = undefined by default\r\n\t\tif(!module.children) module.children = [];\r\n\t\tObject.defineProperty(module, \"loaded\", {\r\n\t\t\tenumerable: true,\r\n\t\t\tget: function() {\r\n\t\t\t\treturn module.l;\r\n\t\t\t}\r\n\t\t});\r\n\t\tObject.defineProperty(module, \"id\", {\r\n\t\t\tenumerable: true,\r\n\t\t\tget: function() {\r\n\t\t\t\treturn module.i;\r\n\t\t\t}\r\n\t\t});\r\n\t\tmodule.webpackPolyfill = 1;\r\n\t}\r\n\treturn module;\r\n};\r\n\n\n/***/ }),\n/* 4 */\n/***/ (function(module, exports, __webpack_require__) {\n\n/* WEBPACK VAR INJECTION */(function(global) {var __WEBPACK_AMD_DEFINE_ARRAY__, __WEBPACK_AMD_DEFINE_RESULT__;/// <reference path=\"./_estree.d.ts\" />\r\n!(__WEBPACK_AMD_DEFINE_ARRAY__ = [__webpack_require__, exports], __WEBPACK_AMD_DEFINE_RESULT__ = function (require, exports) {\r\n    \"use strict\";\r\n    /**\r\n     * @license\r\n     * JavaScript Interpreter\r\n     *\r\n     * Copyright 2013-2017 Google Inc. and Jun Kato\r\n     *\r\n     * Licensed under the Apache License, Version 2.0 (the \"License\");\r\n     * you may not use this file except in compliance with the License.\r\n     * You may obtain a copy of the License at\r\n     *\r\n     *   http://www.apache.org/licenses/LICENSE-2.0\r\n     *\r\n     * Unless required by applicable law or agreed to in writing, software\r\n     * distributed under the License is distributed on an \"AS IS\" BASIS,\r\n     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n     * See the License for the specific language governing permissions and\r\n     * limitations under the License.\r\n     */\r\n    /**\r\n     * @fileoverview Interpreting JavaScript in JavaScript.\r\n     * @author fraser@google.com (Neil Fraser)\r\n     * @author i@junkato.jp (Jun Kato)\r\n     */\r\n    /**\r\n     * Create a new interpreter.\r\n     * @param {string|!Object} code Raw JavaScript text or AST.\r\n     * @param {Function=} opt_initFunc Optional initialization function.  Used to\r\n     *     define APIs.  When called it is passed the interpreter object and the\r\n     *     global scope object.\r\n     * @constructor\r\n     */\r\n    var Interpreter = (function () {\r\n        function Interpreter(code, opt_initFunc) {\r\n            if (typeof code === 'string') {\r\n                code = Interpreter.acorn.parse(code, Interpreter.PARSE_OPTIONS);\r\n            }\r\n            this.ast = code;\r\n            this.initFunc_ = opt_initFunc;\r\n            this.paused_ = false;\r\n            this.polyfills_ = [];\r\n            // Unique identifier for native functions.  Used in serialization.\r\n            this.functionCounter_ = 0;\r\n            // Map node types to our step function names; a property lookup is faster\r\n            // than string concatenation with \"step\" prefix.\r\n            this.stepFunctions_ = Object.create(null);\r\n            var stepMatch = /^step([A-Z]\\w*)$/;\r\n            var m;\r\n            var props = Object.getOwnPropertyNames(Interpreter.prototype);\r\n            for (var i = 0; i < props.length; i++) {\r\n                var methodName = props[i];\r\n                if ((typeof Interpreter.prototype[methodName] === 'function') &&\r\n                    (m = methodName.match(stepMatch))) {\r\n                    this.stepFunctions_[m[1]] = Interpreter.prototype[methodName].bind(this);\r\n                }\r\n            }\r\n            // Create and initialize the global scope.\r\n            this.global = this.createScope(this.ast, null);\r\n            // Run the polyfills.\r\n            this.ast = Interpreter.acorn.parse(this.polyfills_.join('\\n'), Interpreter.PARSE_OPTIONS);\r\n            this.polyfills_ = undefined; // Allow polyfill strings to garbage collect.\r\n            this.stripLocations_(this.ast, undefined, undefined);\r\n            var state = new Interpreter.MyState(this.ast, this.global);\r\n            state.done = false;\r\n            this.stateStack = [state];\r\n            this.run();\r\n            this.value = undefined;\r\n            // Point at the main program.\r\n            this.ast = code;\r\n            var state = new Interpreter.MyState(this.ast, this.global);\r\n            state.done = false;\r\n            this.stateStack.length = 0;\r\n            this.stateStack[0] = state;\r\n            // Get a handle on Acorn's node_t object.  It's tricky to access.\r\n            this.nodeConstructor = state.node.constructor;\r\n            // Preserve publicly properties from being pruned/renamed by JS compilers.\r\n            // Add others as needed.\r\n            this['stateStack'] = this.stateStack;\r\n            this['OBJECT'] = this.OBJECT;\r\n            this['OBJECT_PROTO'] = this.OBJECT_PROTO;\r\n            this['FUNCTION'] = this.FUNCTION;\r\n            this['FUNCTION_PROTO'] = this.FUNCTION_PROTO;\r\n            this['ARRAY'] = this.ARRAY;\r\n            this['ARRAY_PROTO'] = this.ARRAY_PROTO;\r\n            this['REGEXP'] = this.REGEXP;\r\n            this['REGEXP_PROTO'] = this.REGEXP_PROTO;\r\n            // The following properties are obsolete.  Do not use.\r\n            this['UNDEFINED'] = undefined;\r\n            this['NULL'] = null;\r\n            this['NAN'] = NaN;\r\n            this['TRUE'] = true;\r\n            this['FALSE'] = false;\r\n            this['STRING_EMPTY'] = '';\r\n            this['NUMBER_ZERO'] = 0;\r\n            this['NUMBER_ONE'] = 1;\r\n        }\r\n        ;\r\n        /**\r\n         * Add more code to the interpreter.\r\n         * @param {string|!Object} code Raw JavaScript text or AST.\r\n         */\r\n        Interpreter.prototype.appendCode = function (code) {\r\n            var state = this.stateStack[0];\r\n            if (!state || state.node['type'] !== 'Program') {\r\n                throw Error('Expecting original AST to start with a Program node.');\r\n            }\r\n            if (typeof code === 'string') {\r\n                code = Interpreter.acorn.parse(code, Interpreter.PARSE_OPTIONS);\r\n            }\r\n            if (!code || code['type'] !== 'Program') {\r\n                throw Error('Expecting new AST to start with a Program node.');\r\n            }\r\n            this.populateScope_(code, state.scope);\r\n            // Append the new program to the old one.\r\n            for (var i = 0, node; (node = code['body'][i]); i++) {\r\n                state.node['body'].push(node);\r\n            }\r\n            state.done = false;\r\n        };\r\n        ;\r\n        /**\r\n         * Execute one step of the interpreter.\r\n         * @return {boolean} True if a step was executed, false if no more instructions.\r\n         */\r\n        Interpreter.prototype.step = function () {\r\n            var stack = this.stateStack;\r\n            var state = stack[stack.length - 1];\r\n            if (!state) {\r\n                return false;\r\n            }\r\n            var node = state.node, type = node['type'];\r\n            if (type === 'Program' && state.done) {\r\n                return false;\r\n            }\r\n            else if (this.paused_) {\r\n                return true;\r\n            }\r\n            try {\r\n                var nextState = this.stepFunctions_[type](stack, state, node);\r\n            }\r\n            catch (e) {\r\n                // Eat any step errors.  They have been thrown on the stack.\r\n                if (e !== Interpreter.STEP_ERROR) {\r\n                    // Uh oh.  This is a real error in the JS-Interpreter.  Rethrow.\r\n                    throw e;\r\n                }\r\n            }\r\n            if (nextState) {\r\n                stack.push(nextState);\r\n            }\r\n            if (!node['end']) {\r\n                // This is polyfill code.  Keep executing until we arrive at user code.\r\n                return this.step();\r\n            }\r\n            return true;\r\n        };\r\n        ;\r\n        /**\r\n         * Execute the interpreter to program completion.  Vulnerable to infinite loops.\r\n         * @return {boolean} True if a execution is asynchronously blocked,\r\n         *     false if no more instructions.\r\n         */\r\n        Interpreter.prototype.run = function () {\r\n            while (!this.paused_ && this.step()) { }\r\n            return this.paused_;\r\n        };\r\n        ;\r\n        /**\r\n         * Initialize the global scope with buitin properties and functions.\r\n         * @param {!Interpreter.MyObject} scope Global scope.\r\n         */\r\n        Interpreter.prototype.initGlobalScope = function (scope) {\r\n            // Initialize uneditable global properties.\r\n            this.setProperty(scope, 'NaN', NaN, Interpreter.READONLY_DESCRIPTOR);\r\n            this.setProperty(scope, 'Infinity', Infinity, Interpreter.READONLY_DESCRIPTOR);\r\n            this.setProperty(scope, 'undefined', undefined, Interpreter.READONLY_DESCRIPTOR);\r\n            this.setProperty(scope, 'window', scope, Interpreter.READONLY_DESCRIPTOR);\r\n            this.setProperty(scope, 'this', scope, Interpreter.READONLY_DESCRIPTOR);\r\n            this.setProperty(scope, 'self', scope); // Editable.\r\n            // Create the objects which will become Object.prototype and\r\n            // Function.prototype, which are needed to bootstrap everything else.\r\n            this.OBJECT_PROTO = new Interpreter.MyObject(null);\r\n            this.FUNCTION_PROTO = new Interpreter.MyObject(this.OBJECT_PROTO);\r\n            // Initialize global objects.\r\n            this.initFunction(scope);\r\n            this.initObject(scope);\r\n            // Unable to set scope's parent prior (OBJECT did not exist).\r\n            // Note that in a browser this would be 'Window', whereas in Node.js it would\r\n            // be 'Object'.  This interpreter is closer to Node in that it has no DOM.\r\n            scope.proto = this.OBJECT_PROTO;\r\n            this.setProperty(scope, 'constructor', this.OBJECT);\r\n            this.initArray(scope);\r\n            this.initString(scope);\r\n            this.initBoolean(scope);\r\n            this.initNumber(scope);\r\n            this.initDate(scope);\r\n            this.initRegExp(scope);\r\n            this.initError(scope);\r\n            this.initMath(scope);\r\n            this.initJSON(scope);\r\n            // Initialize global functions.\r\n            var thisInterpreter = this;\r\n            var func = this.createNativeFunction(function (x) { throw EvalError(\"Can't happen\"); }, false);\r\n            func.eval = true;\r\n            this.setProperty(scope, 'eval', func);\r\n            this.setProperty(scope, 'parseInt', this.createNativeFunction(parseInt, false));\r\n            this.setProperty(scope, 'parseFloat', this.createNativeFunction(parseFloat, false));\r\n            this.setProperty(scope, 'isNaN', this.createNativeFunction(isNaN, false));\r\n            this.setProperty(scope, 'isFinite', this.createNativeFunction(isFinite, false));\r\n            var strFunctions = [\r\n                [escape, 'escape'], [unescape, 'unescape'],\r\n                [decodeURI, 'decodeURI'], [decodeURIComponent, 'decodeURIComponent'],\r\n                [encodeURI, 'encodeURI'], [encodeURIComponent, 'encodeURIComponent']\r\n            ];\r\n            for (var i = 0; i < strFunctions.length; i++) {\r\n                var wrapper = (function (nativeFunc) {\r\n                    return function (str) {\r\n                        try {\r\n                            return nativeFunc(str);\r\n                        }\r\n                        catch (e) {\r\n                            // decodeURI('%xy') will throw an error.  Catch and rethrow.\r\n                            thisInterpreter.throwException(thisInterpreter.URI_ERROR, e.message);\r\n                        }\r\n                    };\r\n                })(strFunctions[i][0]);\r\n                this.setProperty(scope, strFunctions[i][1], this.createNativeFunction(wrapper, false), Interpreter.NONENUMERABLE_DESCRIPTOR);\r\n            }\r\n            // Run any user-provided initialization.\r\n            if (this.initFunc_) {\r\n                this.initFunc_(this, scope);\r\n            }\r\n        };\r\n        ;\r\n        /**\r\n         * Initialize the Function class.\r\n         * @param {!Interpreter.MyObject} scope Global scope.\r\n         */\r\n        Interpreter.prototype.initFunction = function (scope) {\r\n            var thisInterpreter = this;\r\n            var wrapper;\r\n            var identifierRegexp = /^[A-Za-z_$][\\w$]*$/;\r\n            // Function constructor.\r\n            wrapper = function (var_args) {\r\n                if (thisInterpreter.calledWithNew()) {\r\n                    // Called as new Function().\r\n                    var newFunc = this;\r\n                }\r\n                else {\r\n                    // Called as Function().\r\n                    var newFunc = thisInterpreter.createObjectProto(thisInterpreter.FUNCTION_PROTO);\r\n                }\r\n                if (arguments.length) {\r\n                    var code = String(arguments[arguments.length - 1]);\r\n                }\r\n                else {\r\n                    var code = '';\r\n                }\r\n                var args = [];\r\n                for (var i = 0; i < arguments.length - 1; i++) {\r\n                    var name = String(arguments[i]);\r\n                    if (!name.match(identifierRegexp)) {\r\n                        thisInterpreter.throwException(thisInterpreter.SYNTAX_ERROR, 'Invalid function argument: ' + name);\r\n                    }\r\n                    args.push(name);\r\n                }\r\n                args = args.join(', ');\r\n                // Interestingly, the scope for constructed functions is the global scope,\r\n                // even if they were constructed in some other scope.\r\n                newFunc.parentScope = thisInterpreter.global;\r\n                // Acorn needs to parse code in the context of a function or else 'return'\r\n                // statements will be syntax errors.\r\n                try {\r\n                    var ast = Interpreter.acorn.parse('$ = function(' + args + ') {' + code + '};', Interpreter.PARSE_OPTIONS);\r\n                }\r\n                catch (e) {\r\n                    // Acorn threw a SyntaxError.  Rethrow as a trappable error.\r\n                    thisInterpreter.throwException(thisInterpreter.SYNTAX_ERROR, 'Invalid code: ' + e.message);\r\n                }\r\n                if (ast['body'].length !== 1) {\r\n                    // Function('a', 'return a + 6;}; {alert(1);');\r\n                    thisInterpreter.throwException(thisInterpreter.SYNTAX_ERROR, 'Invalid code in function body.');\r\n                }\r\n                newFunc.node = ast['body'][0]['expression']['right'];\r\n                thisInterpreter.setProperty(newFunc, 'length', newFunc.node['length'], Interpreter.READONLY_DESCRIPTOR);\r\n                return newFunc;\r\n            };\r\n            wrapper.id = this.functionCounter_++;\r\n            this.FUNCTION = this.createObjectProto(this.FUNCTION_PROTO);\r\n            this.setProperty(scope, 'Function', this.FUNCTION);\r\n            // Manually setup type and prototype because createObj doesn't recognize\r\n            // this object as a function (this.FUNCTION did not exist).\r\n            this.setProperty(this.FUNCTION, 'prototype', this.FUNCTION_PROTO);\r\n            this.FUNCTION.nativeFunc = wrapper;\r\n            // Configure Function.prototype.\r\n            this.setProperty(this.FUNCTION_PROTO, 'constructor', this.FUNCTION, Interpreter.NONENUMERABLE_DESCRIPTOR);\r\n            this.FUNCTION_PROTO.nativeFunc = function () { };\r\n            this.FUNCTION_PROTO.nativeFunc.id = this.functionCounter_++;\r\n            this.setProperty(this.FUNCTION_PROTO, 'length', 0, Interpreter.READONLY_DESCRIPTOR);\r\n            var boxThis = function (value) {\r\n                // In non-strict mode 'this' must be an object.\r\n                if ((!value || !value.isObject) && !thisInterpreter.getScope().strict) {\r\n                    if (value === undefined || value === null) {\r\n                        // 'Undefined' and 'null' are changed to global object.\r\n                        value = thisInterpreter.global;\r\n                    }\r\n                    else {\r\n                        // Primitives must be boxed in non-strict mode.\r\n                        var box = thisInterpreter.createObjectProto(thisInterpreter.getPrototype(value));\r\n                        box.data = value;\r\n                        value = box;\r\n                    }\r\n                }\r\n                return value;\r\n            };\r\n            wrapper = function (thisArg, args) {\r\n                var state = thisInterpreter.stateStack[thisInterpreter.stateStack.length - 1];\r\n                // Rewrite the current 'CallExpression' to apply a different function.\r\n                state.func_ = this;\r\n                // Assign the 'this' object.\r\n                state.funcThis_ = boxThis(thisArg);\r\n                // Bind any provided arguments.\r\n                state.arguments_ = [];\r\n                if (args !== null && args !== undefined) {\r\n                    if (args.isObject) {\r\n                        state.arguments_ = thisInterpreter.pseudoToNative(args);\r\n                    }\r\n                    else {\r\n                        thisInterpreter.throwException(thisInterpreter.TYPE_ERROR, 'CreateListFromArrayLike called on non-object');\r\n                    }\r\n                }\r\n                state.doneExec_ = false;\r\n            };\r\n            this.setNativeFunctionPrototype(this.FUNCTION, 'apply', wrapper);\r\n            wrapper = function (thisArg, var_args) {\r\n                var state = thisInterpreter.stateStack[thisInterpreter.stateStack.length - 1];\r\n                // Rewrite the current 'CallExpression' to call a different function.\r\n                state.func_ = this;\r\n                // Assign the 'this' object.\r\n                state.funcThis_ = boxThis(thisArg);\r\n                // Bind any provided arguments.\r\n                state.arguments_ = [];\r\n                for (var i = 1; i < arguments.length; i++) {\r\n                    state.arguments_.push(arguments[i]);\r\n                }\r\n                state.doneExec_ = false;\r\n            };\r\n            this.setNativeFunctionPrototype(this.FUNCTION, 'call', wrapper);\r\n            this.polyfills_.push(\r\n            // Polyfill copied from:\r\n            // developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_objects/Function/bind\r\n            \"Object.defineProperty(Function.prototype, 'bind',\", \"{configurable: true, writable: true, value:\", \"function(oThis) {\", \"if (typeof this !== 'function') {\", \"throw TypeError('What is trying to be bound is not callable');\", \"}\", \"var aArgs   = Array.prototype.slice.call(arguments, 1),\", \"fToBind = this,\", \"fNOP    = function() {},\", \"fBound  = function() {\", \"return fToBind.apply(this instanceof fNOP\", \"? this\", \": oThis,\", \"aArgs.concat(Array.prototype.slice.call(arguments)));\", \"};\", \"if (this.prototype) {\", \"fNOP.prototype = this.prototype;\", \"}\", \"fBound.prototype = new fNOP();\", \"return fBound;\", \"}\", \"});\", \"\");\r\n            // Function has no parent to inherit from, so it needs its own mandatory\r\n            // toString and valueOf functions.\r\n            wrapper = function () {\r\n                return this.toString();\r\n            };\r\n            this.setNativeFunctionPrototype(this.FUNCTION, 'toString', wrapper);\r\n            this.setProperty(this.FUNCTION, 'toString', this.createNativeFunction(wrapper, false), Interpreter.NONENUMERABLE_DESCRIPTOR);\r\n            wrapper = function () {\r\n                return this.valueOf();\r\n            };\r\n            this.setNativeFunctionPrototype(this.FUNCTION, 'valueOf', wrapper);\r\n            this.setProperty(this.FUNCTION, 'valueOf', this.createNativeFunction(wrapper, false), Interpreter.NONENUMERABLE_DESCRIPTOR);\r\n        };\r\n        ;\r\n        /**\r\n         * Initialize the Object class.\r\n         * @param {!Interpreter.MyObject} scope Global scope.\r\n         */\r\n        Interpreter.prototype.initObject = function (scope) {\r\n            var thisInterpreter = this;\r\n            var wrapper;\r\n            // Object constructor.\r\n            wrapper = function (value) {\r\n                if (value === undefined || value === null) {\r\n                    // Create a new object.\r\n                    if (thisInterpreter.calledWithNew()) {\r\n                        // Called as new Object().\r\n                        return this;\r\n                    }\r\n                    else {\r\n                        // Called as Object().\r\n                        return thisInterpreter.createObjectProto(thisInterpreter.OBJECT_PROTO);\r\n                    }\r\n                }\r\n                if (!value.isObject) {\r\n                    // Wrap the value as an object.\r\n                    var box = thisInterpreter.createObjectProto(thisInterpreter.getPrototype(value));\r\n                    box.data = value;\r\n                    return box;\r\n                }\r\n                // Return the provided object.\r\n                return value;\r\n            };\r\n            this.OBJECT = this.createNativeFunction(wrapper, true);\r\n            // Throw away the created prototype and use the root prototype.\r\n            this.setProperty(this.OBJECT, 'prototype', this.OBJECT_PROTO);\r\n            this.setProperty(this.OBJECT_PROTO, 'constructor', this.OBJECT);\r\n            this.setProperty(scope, 'Object', this.OBJECT);\r\n            /**\r\n             * Checks if the provided value is null or undefined.\r\n             * If so, then throw an error in the call stack.\r\n             * @param {Interpreter.MyValue} value Value to check.\r\n             */\r\n            var throwIfNullUndefined = function (value) {\r\n                if (value === undefined || value === null) {\r\n                    thisInterpreter.throwException(thisInterpreter.TYPE_ERROR, \"Cannot convert '\" + value + \"' to object\");\r\n                }\r\n            };\r\n            // Static methods on Object.\r\n            wrapper = function (obj) {\r\n                throwIfNullUndefined(obj);\r\n                var props = obj.isObject ? obj.properties : obj;\r\n                return thisInterpreter.nativeToPseudo(Object.getOwnPropertyNames(props));\r\n            };\r\n            this.setProperty(this.OBJECT, 'getOwnPropertyNames', this.createNativeFunction(wrapper, false), Interpreter.NONENUMERABLE_DESCRIPTOR);\r\n            wrapper = function (obj) {\r\n                throwIfNullUndefined(obj);\r\n                if (!obj.isObject) {\r\n                    return thisInterpreter.nativeToPseudo(Object.keys(obj));\r\n                }\r\n                return thisInterpreter.nativeToPseudo(Object.keys(obj.properties));\r\n            };\r\n            this.setProperty(this.OBJECT, 'keys', this.createNativeFunction(wrapper, false), Interpreter.NONENUMERABLE_DESCRIPTOR);\r\n            wrapper = function (proto) {\r\n                // Support for the second argument is the responsibility of a polyfill.\r\n                if (proto === null) {\r\n                    return thisInterpreter.createObjectProto(null);\r\n                }\r\n                if (proto === undefined || !proto.isObject) {\r\n                    thisInterpreter.throwException(thisInterpreter.TYPE_ERROR, 'Object prototype may only be an Object or null');\r\n                }\r\n                return thisInterpreter.createObjectProto(proto);\r\n            };\r\n            this.setProperty(this.OBJECT, 'create', this.createNativeFunction(wrapper, false), Interpreter.NONENUMERABLE_DESCRIPTOR);\r\n            // Add a polyfill to handle create's second argument.\r\n            this.polyfills_.push(\"(function() {\", \"var create_ = Object.create;\", \"Object.create = function(proto, props) {\", \"var obj = create_(proto);\", \"props && Object.defineProperties(obj, props);\", \"return obj;\", \"};\", \"})();\", \"\");\r\n            wrapper = function (obj, prop, descriptor) {\r\n                prop = String(prop);\r\n                if (!obj || !obj.isObject) {\r\n                    thisInterpreter.throwException(thisInterpreter.TYPE_ERROR, 'Object.defineProperty called on non-object');\r\n                }\r\n                if (!descriptor || !descriptor.isObject) {\r\n                    thisInterpreter.throwException(thisInterpreter.TYPE_ERROR, 'Property description must be an object');\r\n                }\r\n                if (!obj.properties[prop] && obj.preventExtensions) {\r\n                    thisInterpreter.throwException(thisInterpreter.TYPE_ERROR, \"Can't define property '\" + prop + \"', object is not extensible\");\r\n                }\r\n                // The polyfill guarantees no inheritance and no getter functions.\r\n                // Therefore the descriptor properties map is the native object needed.\r\n                thisInterpreter.setProperty(obj, prop, ReferenceError, descriptor.properties);\r\n                return obj;\r\n            };\r\n            this.setProperty(this.OBJECT, 'defineProperty', this.createNativeFunction(wrapper, false), Interpreter.NONENUMERABLE_DESCRIPTOR);\r\n            this.polyfills_.push(\r\n            // Flatten the descriptor to remove any inheritance or getter functions.\r\n            \"(function() {\", \"var defineProperty_ = Object.defineProperty;\", \"Object.defineProperty = function(obj, prop, d1) {\", \"var d2 = {};\", \"if ('configurable' in d1) d2.configurable = d1.configurable;\", \"if ('enumerable' in d1) d2.enumerable = d1.enumerable;\", \"if ('writable' in d1) d2.writable = d1.writable;\", \"if ('value' in d1) d2.value = d1.value;\", \"if ('get' in d1) d2.get = d1.get;\", \"if ('set' in d1) d2.set = d1.set;\", \"return defineProperty_(obj, prop, d2);\", \"};\", \"})();\", \"Object.defineProperty(Object, 'defineProperties',\", \"{configurable: true, writable: true, value:\", \"function(obj, props) {\", \"var keys = Object.keys(props);\", \"for (var i = 0; i < keys.length; i++) {\", \"Object.defineProperty(obj, keys[i], props[keys[i]]);\", \"}\", \"return obj;\", \"}\", \"});\", \"\");\r\n            wrapper = function (obj, prop) {\r\n                if (!obj || !obj.isObject) {\r\n                    thisInterpreter.throwException(thisInterpreter.TYPE_ERROR, 'Object.getOwnPropertyDescriptor called on non-object');\r\n                }\r\n                prop = String(prop);\r\n                if (!(prop in obj.properties)) {\r\n                    return undefined;\r\n                }\r\n                var descriptor = Object.getOwnPropertyDescriptor(obj.properties, prop);\r\n                var getter = obj.getter[prop];\r\n                var setter = obj.setter[prop];\r\n                if (getter || setter) {\r\n                    descriptor.get = getter;\r\n                    descriptor.set = setter;\r\n                    delete descriptor.value;\r\n                    delete descriptor.writable;\r\n                }\r\n                var pseudoDescriptor = thisInterpreter.nativeToPseudo(descriptor);\r\n                if ('value' in descriptor) {\r\n                    thisInterpreter.setProperty(pseudoDescriptor, 'value', descriptor.value);\r\n                }\r\n                return pseudoDescriptor;\r\n            };\r\n            this.setProperty(this.OBJECT, 'getOwnPropertyDescriptor', this.createNativeFunction(wrapper, false), Interpreter.NONENUMERABLE_DESCRIPTOR);\r\n            wrapper = function (obj) {\r\n                throwIfNullUndefined(obj);\r\n                return thisInterpreter.getPrototype(obj);\r\n            };\r\n            this.setProperty(this.OBJECT, 'getPrototypeOf', this.createNativeFunction(wrapper, false), Interpreter.NONENUMERABLE_DESCRIPTOR);\r\n            wrapper = function (obj) {\r\n                return Boolean(obj) && !obj.preventExtensions;\r\n            };\r\n            this.setProperty(this.OBJECT, 'isExtensible', this.createNativeFunction(wrapper, false), Interpreter.NONENUMERABLE_DESCRIPTOR);\r\n            wrapper = function (obj) {\r\n                if (obj && obj.isObject) {\r\n                    obj.preventExtensions = true;\r\n                }\r\n                return obj;\r\n            };\r\n            this.setProperty(this.OBJECT, 'preventExtensions', this.createNativeFunction(wrapper, false), Interpreter.NONENUMERABLE_DESCRIPTOR);\r\n            // Instance methods on Object.\r\n            this.setNativeFunctionPrototype(this.OBJECT, 'toString', Interpreter.MyObject.prototype.toString);\r\n            this.setNativeFunctionPrototype(this.OBJECT, 'toLocaleString', Interpreter.MyObject.prototype.toString);\r\n            this.setNativeFunctionPrototype(this.OBJECT, 'valueOf', Interpreter.MyObject.prototype.valueOf);\r\n            wrapper = function (prop) {\r\n                throwIfNullUndefined(this);\r\n                if (!this.isObject) {\r\n                    return this.hasOwnProperty(prop);\r\n                }\r\n                return String(prop) in this.properties;\r\n            };\r\n            this.setNativeFunctionPrototype(this.OBJECT, 'hasOwnProperty', wrapper);\r\n            wrapper = function (prop) {\r\n                throwIfNullUndefined(this);\r\n                return Object.prototype.propertyIsEnumerable.call(this.properties, prop);\r\n            };\r\n            this.setNativeFunctionPrototype(this.OBJECT, 'propertyIsEnumerable', wrapper);\r\n            wrapper = function (obj) {\r\n                while (true) {\r\n                    // Note, circular loops shouldn't be possible.\r\n                    obj = thisInterpreter.getPrototype(obj);\r\n                    if (!obj) {\r\n                        // No parent; reached the top.\r\n                        return false;\r\n                    }\r\n                    if (obj === this) {\r\n                        return true;\r\n                    }\r\n                }\r\n            };\r\n            this.setNativeFunctionPrototype(this.OBJECT, 'isPrototypeOf', wrapper);\r\n        };\r\n        ;\r\n        /**\r\n         * Initialize the Array class.\r\n         * @param {!Interpreter.MyObject} scope Global scope.\r\n         */\r\n        Interpreter.prototype.initArray = function (scope) {\r\n            var thisInterpreter = this;\r\n            var getInt = function (obj, def) {\r\n                // Return an integer, or the default.\r\n                var n = obj ? Math.floor(obj) : def;\r\n                if (isNaN(n)) {\r\n                    n = def;\r\n                }\r\n                return n;\r\n            };\r\n            var wrapper;\r\n            // Array constructor.\r\n            wrapper = function (var_args) {\r\n                if (thisInterpreter.calledWithNew()) {\r\n                    // Called as new Array().\r\n                    var newArray = this;\r\n                }\r\n                else {\r\n                    // Called as Array().\r\n                    var newArray = thisInterpreter.createObjectProto(thisInterpreter.ARRAY_PROTO);\r\n                }\r\n                var first = arguments[0];\r\n                if (arguments.length === 1 && typeof first === 'number') {\r\n                    if (isNaN(Interpreter.legalArrayLength(first))) {\r\n                        thisInterpreter.throwException(thisInterpreter.RANGE_ERROR, 'Invalid array length');\r\n                    }\r\n                    newArray.properties.length = first;\r\n                }\r\n                else {\r\n                    for (var i = 0; i < arguments.length; i++) {\r\n                        newArray.properties[i] = arguments[i];\r\n                    }\r\n                    newArray.properties.length = i;\r\n                }\r\n                return newArray;\r\n            };\r\n            this.ARRAY = this.createNativeFunction(wrapper, true);\r\n            this.ARRAY_PROTO = this.ARRAY.properties['prototype'];\r\n            this.setProperty(scope, 'Array', this.ARRAY);\r\n            // Static methods on Array.\r\n            wrapper = function (obj) {\r\n                return obj && obj.class === 'Array';\r\n            };\r\n            this.setProperty(this.ARRAY, 'isArray', this.createNativeFunction(wrapper, false), Interpreter.NONENUMERABLE_DESCRIPTOR);\r\n            // Instance methods on Array.\r\n            wrapper = function () {\r\n                return Array.prototype.pop.call(this.properties);\r\n            };\r\n            this.setNativeFunctionPrototype(this.ARRAY, 'pop', wrapper);\r\n            wrapper = function (var_args) {\r\n                return Array.prototype.push.apply(this.properties, arguments);\r\n            };\r\n            this.setNativeFunctionPrototype(this.ARRAY, 'push', wrapper);\r\n            wrapper = function () {\r\n                return Array.prototype.shift.call(this.properties);\r\n            };\r\n            this.setNativeFunctionPrototype(this.ARRAY, 'shift', wrapper);\r\n            wrapper = function (var_args) {\r\n                return Array.prototype.unshift.apply(this.properties, arguments);\r\n            };\r\n            this.setNativeFunctionPrototype(this.ARRAY, 'unshift', wrapper);\r\n            wrapper = function () {\r\n                Array.prototype.reverse.call(this.properties);\r\n                return this;\r\n            };\r\n            this.setNativeFunctionPrototype(this.ARRAY, 'reverse', wrapper);\r\n            wrapper = function (index, howmany /*, var_args*/) {\r\n                var list = Array.prototype.splice.apply(this.properties, arguments);\r\n                return thisInterpreter.nativeToPseudo(list);\r\n            };\r\n            this.setNativeFunctionPrototype(this.ARRAY, 'splice', wrapper);\r\n            wrapper = function (opt_begin, opt_end) {\r\n                var list = Array.prototype.slice.call(this.properties, opt_begin, opt_end);\r\n                return thisInterpreter.nativeToPseudo(list);\r\n            };\r\n            this.setNativeFunctionPrototype(this.ARRAY, 'slice', wrapper);\r\n            wrapper = function (opt_separator) {\r\n                return Array.prototype.join.call(this.properties, opt_separator);\r\n            };\r\n            this.setNativeFunctionPrototype(this.ARRAY, 'join', wrapper);\r\n            wrapper = function (var_args) {\r\n                var list = [];\r\n                var length = 0;\r\n                // Start by copying the current array.\r\n                var iLength = thisInterpreter.getProperty(this, 'length');\r\n                for (var i = 0; i < iLength; i++) {\r\n                    if (thisInterpreter.hasProperty(this, i)) {\r\n                        var element = thisInterpreter.getProperty(this, i);\r\n                        list[length] = element;\r\n                    }\r\n                    length++;\r\n                }\r\n                // Loop through all arguments and copy them in.\r\n                for (var i = 0; i < arguments.length; i++) {\r\n                    var value = arguments[i];\r\n                    if (thisInterpreter.isa(value, thisInterpreter.ARRAY)) {\r\n                        var jLength = thisInterpreter.getProperty(value, 'length');\r\n                        for (var j = 0; j < jLength; j++) {\r\n                            if (thisInterpreter.hasProperty(value, j)) {\r\n                                list[length] = thisInterpreter.getProperty(value, j);\r\n                            }\r\n                            length++;\r\n                        }\r\n                    }\r\n                    else {\r\n                        list[length] = value;\r\n                    }\r\n                }\r\n                return thisInterpreter.nativeToPseudo(list);\r\n            };\r\n            this.setNativeFunctionPrototype(this.ARRAY, 'concat', wrapper);\r\n            wrapper = function (searchElement, opt_fromIndex) {\r\n                return Array.prototype.indexOf.apply(this.properties, arguments);\r\n            };\r\n            this.setNativeFunctionPrototype(this.ARRAY, 'indexOf', wrapper);\r\n            wrapper = function (searchElement, opt_fromIndex) {\r\n                return Array.prototype.lastIndexOf.apply(this.properties, arguments);\r\n            };\r\n            this.setNativeFunctionPrototype(this.ARRAY, 'lastIndexOf', wrapper);\r\n            wrapper = function () {\r\n                Array.prototype.sort.call(this.properties);\r\n                return this;\r\n            };\r\n            this.setNativeFunctionPrototype(this.ARRAY, 'sort', wrapper);\r\n            this.polyfills_.push(\r\n            // Polyfill copied from:\r\n            // developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Array/every\r\n            \"Object.defineProperty(Array.prototype, 'every',\", \"{configurable: true, writable: true, value:\", \"function(callbackfn, thisArg) {\", \"if (!this || typeof callbackfn !== 'function') throw TypeError();\", \"var T, k;\", \"var O = Object(this);\", \"var len = O.length >>> 0;\", \"if (arguments.length > 1) T = thisArg;\", \"k = 0;\", \"while (k < len) {\", \"if (k in O && !callbackfn.call(T, O[k], k, O)) return false;\", \"k++;\", \"}\", \"return true;\", \"}\", \"});\", \r\n            // Polyfill copied from:\r\n            // developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Array/filter\r\n            \"Object.defineProperty(Array.prototype, 'filter',\", \"{configurable: true, writable: true, value:\", \"function(fun/*, thisArg*/) {\", \"if (this === void 0 || this === null || typeof fun !== 'function') throw TypeError();\", \"var t = Object(this);\", \"var len = t.length >>> 0;\", \"var res = [];\", \"var thisArg = arguments.length >= 2 ? arguments[1] : void 0;\", \"for (var i = 0; i < len; i++) {\", \"if (i in t) {\", \"var val = t[i];\", \"if (fun.call(thisArg, val, i, t)) res.push(val);\", \"}\", \"}\", \"return res;\", \"}\", \"});\", \r\n            // Polyfill copied from:\r\n            // developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Array/forEach\r\n            \"Object.defineProperty(Array.prototype, 'forEach',\", \"{configurable: true, writable: true, value:\", \"function(callback, thisArg) {\", \"if (!this || typeof callback !== 'function') throw TypeError();\", \"var T, k;\", \"var O = Object(this);\", \"var len = O.length >>> 0;\", \"if (arguments.length > 1) T = thisArg;\", \"k = 0;\", \"while (k < len) {\", \"if (k in O) callback.call(T, O[k], k, O);\", \"k++;\", \"}\", \"}\", \"});\", \r\n            // Polyfill copied from:\r\n            // developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Array/map\r\n            \"Object.defineProperty(Array.prototype, 'map',\", \"{configurable: true, writable: true, value:\", \"function(callback, thisArg) {\", \"if (!this || typeof callback !== 'function') new TypeError;\", \"var T, A, k;\", \"var O = Object(this);\", \"var len = O.length >>> 0;\", \"if (arguments.length > 1) T = thisArg;\", \"A = new Array(len);\", \"k = 0;\", \"while (k < len) {\", \"if (k in O) A[k] = callback.call(T, O[k], k, O);\", \"k++;\", \"}\", \"return A;\", \"}\", \"});\", \r\n            // Polyfill copied from:\r\n            // developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Array/Reduce\r\n            \"Object.defineProperty(Array.prototype, 'reduce',\", \"{configurable: true, writable: true, value:\", \"function(callback /*, initialValue*/) {\", \"if (!this || typeof callback !== 'function') throw TypeError();\", \"var t = Object(this), len = t.length >>> 0, k = 0, value;\", \"if (arguments.length === 2) {\", \"value = arguments[1];\", \"} else {\", \"while (k < len && !(k in t)) k++;\", \"if (k >= len) {\", \"throw TypeError('Reduce of empty array with no initial value');\", \"}\", \"value = t[k++];\", \"}\", \"for (; k < len; k++) {\", \"if (k in t) value = callback(value, t[k], k, t);\", \"}\", \"return value;\", \"}\", \"});\", \r\n            // Polyfill copied from:\r\n            // developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Array/ReduceRight\r\n            \"Object.defineProperty(Array.prototype, 'reduceRight',\", \"{configurable: true, writable: true, value:\", \"function(callback /*, initialValue*/) {\", \"if (null === this || 'undefined' === typeof this || 'function' !== typeof callback) throw TypeError();\", \"var t = Object(this), len = t.length >>> 0, k = len - 1, value;\", \"if (arguments.length >= 2) {\", \"value = arguments[1];\", \"} else {\", \"while (k >= 0 && !(k in t)) k--;\", \"if (k < 0) {\", \"throw TypeError('Reduce of empty array with no initial value');\", \"}\", \"value = t[k--];\", \"}\", \"for (; k >= 0; k--) {\", \"if (k in t) value = callback(value, t[k], k, t);\", \"}\", \"return value;\", \"}\", \"});\", \r\n            // Polyfill copied from:\r\n            // developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Array/some\r\n            \"Object.defineProperty(Array.prototype, 'some',\", \"{configurable: true, writable: true, value:\", \"function(fun/*, thisArg*/) {\", \"if (!this || typeof fun !== 'function') throw TypeError();\", \"var t = Object(this);\", \"var len = t.length >>> 0;\", \"var thisArg = arguments.length >= 2 ? arguments[1] : void 0;\", \"for (var i = 0; i < len; i++) {\", \"if (i in t && fun.call(thisArg, t[i], i, t)) {\", \"return true;\", \"}\", \"}\", \"return false;\", \"}\", \"});\", \"(function() {\", \"var sort_ = Array.prototype.sort;\", \"Array.prototype.sort = function(opt_comp) {\", \r\n            // Fast native sort.\r\n            \"if (typeof opt_comp !== 'function') {\", \"return sort_.call(this);\", \"}\", \r\n            // Slow bubble sort.\r\n            \"for (var i = 0; i < this.length; i++) {\", \"var changes = 0;\", \"for (var j = 0; j < this.length - i - 1; j++) {\", \"if (opt_comp(this[j], this[j + 1]) > 0) {\", \"var swap = this[j];\", \"this[j] = this[j + 1];\", \"this[j + 1] = swap;\", \"changes++;\", \"}\", \"}\", \"if (!changes) break;\", \"}\", \"return this;\", \"};\", \"})();\", \"Object.defineProperty(Array.prototype, 'toLocaleString',\", \"{configurable: true, writable: true, value:\", \"function() {\", \"var out = [];\", \"for (var i = 0; i < this.length; i++) {\", \"out[i] = (this[i] === null || this[i] === undefined) ? '' : this[i].toLocaleString();\", \"}\", \"return out.join(',');\", \"}\", \"});\", \"\");\r\n        };\r\n        ;\r\n        /**\r\n         * Initialize the String class.\r\n         * @param {!Interpreter.MyObject} scope Global scope.\r\n         */\r\n        Interpreter.prototype.initString = function (scope) {\r\n            var thisInterpreter = this;\r\n            var wrapper;\r\n            // String constructor.\r\n            wrapper = function (value) {\r\n                value = String(value);\r\n                if (thisInterpreter.calledWithNew()) {\r\n                    // Called as new String().\r\n                    this.data = value;\r\n                    return this;\r\n                }\r\n                else {\r\n                    // Called as String().\r\n                    return value;\r\n                }\r\n            };\r\n            this.STRING = this.createNativeFunction(wrapper, true);\r\n            this.setProperty(scope, 'String', this.STRING);\r\n            // Static methods on String.\r\n            this.setProperty(this.STRING, 'fromCharCode', this.createNativeFunction(String.fromCharCode, false), Interpreter.NONENUMERABLE_DESCRIPTOR);\r\n            // Instance methods on String.\r\n            // Methods with exclusively primitive arguments.\r\n            var functions = ['trim', 'toLowerCase', 'toUpperCase',\r\n                'toLocaleLowerCase', 'toLocaleUpperCase', 'charAt', 'charCodeAt',\r\n                'substring', 'slice', 'substr', 'indexOf', 'lastIndexOf', 'concat'];\r\n            for (var i = 0; i < functions.length; i++) {\r\n                this.setNativeFunctionPrototype(this.STRING, functions[i], String.prototype[functions[i]]);\r\n            }\r\n            wrapper = function (compareString, locales, options) {\r\n                locales = locales ? thisInterpreter.pseudoToNative(locales) : undefined;\r\n                options = options ? thisInterpreter.pseudoToNative(options) : undefined;\r\n                return String(this).localeCompare(compareString, locales, options);\r\n            };\r\n            this.setNativeFunctionPrototype(this.STRING, 'localeCompare', wrapper);\r\n            wrapper = function (separator, limit) {\r\n                if (thisInterpreter.isa(separator, thisInterpreter.REGEXP)) {\r\n                    separator = separator.data;\r\n                }\r\n                var jsList = String(this).split(separator, limit);\r\n                return thisInterpreter.nativeToPseudo(jsList);\r\n            };\r\n            this.setNativeFunctionPrototype(this.STRING, 'split', wrapper);\r\n            wrapper = function (regexp) {\r\n                regexp = regexp ? regexp.data : undefined;\r\n                var match = String(this).match(regexp);\r\n                if (!match) {\r\n                    return null;\r\n                }\r\n                return thisInterpreter.nativeToPseudo(match);\r\n            };\r\n            this.setNativeFunctionPrototype(this.STRING, 'match', wrapper);\r\n            wrapper = function (regexp) {\r\n                if (thisInterpreter.isa(regexp, thisInterpreter.REGEXP)) {\r\n                    regexp = regexp.data;\r\n                }\r\n                return String(this).search(regexp);\r\n            };\r\n            this.setNativeFunctionPrototype(this.STRING, 'search', wrapper);\r\n            wrapper = function (substr, newSubstr) {\r\n                // Support for function replacements is the responsibility of a polyfill.\r\n                return String(this).replace(substr.data || substr, newSubstr);\r\n            };\r\n            this.setNativeFunctionPrototype(this.STRING, 'replace', wrapper);\r\n            // Add a polyfill to handle replace's second argument being a function.\r\n            this.polyfills_.push(\"(function() {\", \"var replace_ = String.prototype.replace;\", \"String.prototype.replace = function(substr, newSubstr) {\", \"if (typeof newSubstr !== 'function') {\", \r\n            // string.replace(string|regexp, string)\r\n            \"return replace_.call(this, substr, newSubstr);\", \"}\", \"var str = this;\", \"if (substr instanceof RegExp) {\", // string.replace(regexp, function)\r\n            \"var subs = [];\", \"var m = substr.exec(str);\", \"while (m) {\", \"m.push(m.index, str);\", \"var inject = newSubstr.apply(null, m);\", \"subs.push([m.index, m[0].length, inject]);\", \"m = substr.global ? substr.exec(str) : null;\", \"}\", \"for (var i = subs.length - 1; i >= 0; i--) {\", \"str = str.substring(0, subs[i][0]) + subs[i][2] + \" +\r\n                \"str.substring(subs[i][0] + subs[i][1]);\", \"}\", \"} else {\", // string.replace(string, function)\r\n            \"var i = str.indexOf(substr);\", \"if (i !== -1) {\", \"var inject = newSubstr(str.substr(i, substr.length), i, str);\", \"str = str.substring(0, i) + inject + \" +\r\n                \"str.substring(i + substr.length);\", \"}\", \"}\", \"return str;\", \"};\", \"})();\", \"\");\r\n        };\r\n        ;\r\n        /**\r\n         * Initialize the Boolean class.\r\n         * @param {!Interpreter.MyObject} scope Global scope.\r\n         */\r\n        Interpreter.prototype.initBoolean = function (scope) {\r\n            var thisInterpreter = this;\r\n            var wrapper;\r\n            // Boolean constructor.\r\n            wrapper = function (value) {\r\n                value = Boolean(value);\r\n                if (thisInterpreter.calledWithNew()) {\r\n                    // Called as new Boolean().\r\n                    this.data = value;\r\n                    return this;\r\n                }\r\n                else {\r\n                    // Called as Boolean().\r\n                    return value;\r\n                }\r\n            };\r\n            this.BOOLEAN = this.createNativeFunction(wrapper, true);\r\n            this.setProperty(scope, 'Boolean', this.BOOLEAN);\r\n        };\r\n        ;\r\n        /**\r\n         * Initialize the Number class.\r\n         * @param {!Interpreter.MyObject} scope Global scope.\r\n         */\r\n        Interpreter.prototype.initNumber = function (scope) {\r\n            var thisInterpreter = this;\r\n            var wrapper;\r\n            // Number constructor.\r\n            wrapper = function (value) {\r\n                value = Number(value);\r\n                if (thisInterpreter.calledWithNew()) {\r\n                    // Called as new Number().\r\n                    this.data = value;\r\n                    return this;\r\n                }\r\n                else {\r\n                    // Called as Number().\r\n                    return value;\r\n                }\r\n            };\r\n            this.NUMBER = this.createNativeFunction(wrapper, true);\r\n            this.setProperty(scope, 'Number', this.NUMBER);\r\n            var numConsts = ['MAX_VALUE', 'MIN_VALUE', 'NaN', 'NEGATIVE_INFINITY',\r\n                'POSITIVE_INFINITY'];\r\n            for (var i = 0; i < numConsts.length; i++) {\r\n                this.setProperty(this.NUMBER, numConsts[i], Number[numConsts[i]], Interpreter.READONLY_NONENUMERABLE_DESCRIPTOR);\r\n            }\r\n            // Instance methods on Number.\r\n            wrapper = function (fractionDigits) {\r\n                try {\r\n                    return Number(this).toExponential(fractionDigits);\r\n                }\r\n                catch (e) {\r\n                    // Throws if fractionDigits isn't within 0-20.\r\n                    thisInterpreter.throwException(thisInterpreter.ERROR, e.message);\r\n                }\r\n            };\r\n            this.setNativeFunctionPrototype(this.NUMBER, 'toExponential', wrapper);\r\n            wrapper = function (digits) {\r\n                try {\r\n                    return Number(this).toFixed(digits);\r\n                }\r\n                catch (e) {\r\n                    // Throws if digits isn't within 0-20.\r\n                    thisInterpreter.throwException(thisInterpreter.ERROR, e.message);\r\n                }\r\n            };\r\n            this.setNativeFunctionPrototype(this.NUMBER, 'toFixed', wrapper);\r\n            wrapper = function (precision) {\r\n                try {\r\n                    return Number(this).toPrecision(precision);\r\n                }\r\n                catch (e) {\r\n                    // Throws if precision isn't within range (depends on implementation).\r\n                    thisInterpreter.throwException(thisInterpreter.ERROR, e.message);\r\n                }\r\n            };\r\n            this.setNativeFunctionPrototype(this.NUMBER, 'toPrecision', wrapper);\r\n            wrapper = function (radix) {\r\n                try {\r\n                    return Number(this).toString(radix);\r\n                }\r\n                catch (e) {\r\n                    // Throws if radix isn't within 2-36.\r\n                    thisInterpreter.throwException(thisInterpreter.ERROR, e.message);\r\n                }\r\n            };\r\n            this.setNativeFunctionPrototype(this.NUMBER, 'toString', wrapper);\r\n            wrapper = function (locales, options) {\r\n                locales = locales ? thisInterpreter.pseudoToNative(locales) : undefined;\r\n                options = options ? thisInterpreter.pseudoToNative(options) : undefined;\r\n                return Number(this).toLocaleString(locales, options);\r\n            };\r\n            this.setNativeFunctionPrototype(this.NUMBER, 'toLocaleString', wrapper);\r\n        };\r\n        ;\r\n        /**\r\n         * Initialize the Date class.\r\n         * @param {!Interpreter.MyObject} scope Global scope.\r\n         */\r\n        Interpreter.prototype.initDate = function (scope) {\r\n            var thisInterpreter = this;\r\n            var wrapper;\r\n            // Date constructor.\r\n            wrapper = function (value, var_args) {\r\n                if (!thisInterpreter.calledWithNew()) {\r\n                    // Called as Date().\r\n                    // Calling Date() as a function returns a string, no arguments are heeded.\r\n                    return Date();\r\n                }\r\n                // Called as new Date().\r\n                var args = [null].concat([].slice.call(arguments));\r\n                this.data = new (Function.prototype.bind.apply(Date, args));\r\n                return this;\r\n            };\r\n            this.DATE = this.createNativeFunction(wrapper, true);\r\n            this.setProperty(scope, 'Date', this.DATE);\r\n            // Static methods on Date.\r\n            this.setProperty(this.DATE, 'now', this.createNativeFunction(Date.now, false), Interpreter.NONENUMERABLE_DESCRIPTOR);\r\n            this.setProperty(this.DATE, 'parse', this.createNativeFunction(Date.parse, false), Interpreter.NONENUMERABLE_DESCRIPTOR);\r\n            this.setProperty(this.DATE, 'UTC', this.createNativeFunction(Date.UTC, false), Interpreter.NONENUMERABLE_DESCRIPTOR);\r\n            // Instance methods on Date.\r\n            var functions = ['getDate', 'getDay', 'getFullYear', 'getHours',\r\n                'getMilliseconds', 'getMinutes', 'getMonth', 'getSeconds', 'getTime',\r\n                'getTimezoneOffset', 'getUTCDate', 'getUTCDay', 'getUTCFullYear',\r\n                'getUTCHours', 'getUTCMilliseconds', 'getUTCMinutes', 'getUTCMonth',\r\n                'getUTCSeconds', 'getYear',\r\n                'setDate', 'setFullYear', 'setHours', 'setMilliseconds',\r\n                'setMinutes', 'setMonth', 'setSeconds', 'setTime', 'setUTCDate',\r\n                'setUTCFullYear', 'setUTCHours', 'setUTCMilliseconds', 'setUTCMinutes',\r\n                'setUTCMonth', 'setUTCSeconds', 'setYear',\r\n                'toDateString', 'toISOString', 'toJSON', 'toGMTString',\r\n                'toLocaleDateString', 'toLocaleString', 'toLocaleTimeString',\r\n                'toTimeString', 'toUTCString'];\r\n            for (var i = 0; i < functions.length; i++) {\r\n                wrapper = (function (nativeFunc) {\r\n                    return function (var_args) {\r\n                        var args = [];\r\n                        for (var i = 0; i < arguments.length; i++) {\r\n                            args[i] = thisInterpreter.pseudoToNative(arguments[i]);\r\n                        }\r\n                        return this.data[nativeFunc].apply(this.data, args);\r\n                    };\r\n                })(functions[i]);\r\n                this.setNativeFunctionPrototype(this.DATE, functions[i], wrapper);\r\n            }\r\n        };\r\n        ;\r\n        /**\r\n         * Initialize Regular Expression object.\r\n         * @param {!Interpreter.MyObject} scope Global scope.\r\n         */\r\n        Interpreter.prototype.initRegExp = function (scope) {\r\n            var thisInterpreter = this;\r\n            var wrapper;\r\n            // RegExp constructor.\r\n            wrapper = function (pattern, flags) {\r\n                if (thisInterpreter.calledWithNew()) {\r\n                    // Called as new RegExp().\r\n                    var rgx = this;\r\n                }\r\n                else {\r\n                    // Called as RegExp().\r\n                    var rgx = thisInterpreter.createObjectProto(thisInterpreter.REGEXP_PROTO);\r\n                }\r\n                pattern = pattern ? pattern.toString() : '';\r\n                flags = flags ? flags.toString() : '';\r\n                thisInterpreter.populateRegExp(rgx, new RegExp(pattern, flags));\r\n                return rgx;\r\n            };\r\n            this.REGEXP = this.createNativeFunction(wrapper, true);\r\n            this.REGEXP_PROTO = this.REGEXP.properties['prototype'];\r\n            this.setProperty(scope, 'RegExp', this.REGEXP);\r\n            this.setProperty(this.REGEXP.properties['prototype'], 'global', undefined, Interpreter.READONLY_NONENUMERABLE_DESCRIPTOR);\r\n            this.setProperty(this.REGEXP.properties['prototype'], 'ignoreCase', undefined, Interpreter.READONLY_NONENUMERABLE_DESCRIPTOR);\r\n            this.setProperty(this.REGEXP.properties['prototype'], 'multiline', undefined, Interpreter.READONLY_NONENUMERABLE_DESCRIPTOR);\r\n            this.setProperty(this.REGEXP.properties['prototype'], 'source', '(?:)', Interpreter.READONLY_NONENUMERABLE_DESCRIPTOR);\r\n            wrapper = function (str) {\r\n                return this.data.test(str);\r\n            };\r\n            this.setNativeFunctionPrototype(this.REGEXP, 'test', wrapper);\r\n            wrapper = function (str) {\r\n                str = str.toString();\r\n                // Get lastIndex from wrapped regex, since this is settable.\r\n                this.data.lastIndex =\r\n                    Number(thisInterpreter.getProperty(this, 'lastIndex'));\r\n                var match = this.data.exec(str);\r\n                thisInterpreter.setProperty(this, 'lastIndex', this.data.lastIndex);\r\n                if (match) {\r\n                    var result = thisInterpreter.createObjectProto(thisInterpreter.ARRAY_PROTO);\r\n                    for (var i = 0; i < match.length; i++) {\r\n                        thisInterpreter.setProperty(result, i, match[i]);\r\n                    }\r\n                    // match has additional properties.\r\n                    thisInterpreter.setProperty(result, 'index', match.index);\r\n                    thisInterpreter.setProperty(result, 'input', match.input);\r\n                    return result;\r\n                }\r\n                return null;\r\n            };\r\n            this.setNativeFunctionPrototype(this.REGEXP, 'exec', wrapper);\r\n        };\r\n        ;\r\n        /**\r\n         * Initialize the Error class.\r\n         * @param {!Interpreter.MyObject} scope Global scope.\r\n         */\r\n        Interpreter.prototype.initError = function (scope) {\r\n            var thisInterpreter = this;\r\n            // Error constructor.\r\n            this.ERROR = this.createNativeFunction(function (opt_message) {\r\n                if (thisInterpreter.calledWithNew()) {\r\n                    // Called as new Error().\r\n                    var newError = this;\r\n                }\r\n                else {\r\n                    // Called as Error().\r\n                    var newError = thisInterpreter.createObject(thisInterpreter.ERROR);\r\n                }\r\n                if (opt_message) {\r\n                    thisInterpreter.setProperty(newError, 'message', String(opt_message), Interpreter.NONENUMERABLE_DESCRIPTOR);\r\n                }\r\n                return newError;\r\n            }, true);\r\n            this.setProperty(scope, 'Error', this.ERROR);\r\n            this.setProperty(this.ERROR.properties['prototype'], 'message', '', Interpreter.NONENUMERABLE_DESCRIPTOR);\r\n            this.setProperty(this.ERROR.properties['prototype'], 'name', 'Error', Interpreter.NONENUMERABLE_DESCRIPTOR);\r\n            var createErrorSubclass = function (name) {\r\n                var constructor = thisInterpreter.createNativeFunction(function (opt_message) {\r\n                    if (thisInterpreter.calledWithNew()) {\r\n                        // Called as new XyzError().\r\n                        var newError = this;\r\n                    }\r\n                    else {\r\n                        // Called as XyzError().\r\n                        var newError = thisInterpreter.createObject(constructor);\r\n                    }\r\n                    if (opt_message) {\r\n                        thisInterpreter.setProperty(newError, 'message', String(opt_message), Interpreter.NONENUMERABLE_DESCRIPTOR);\r\n                    }\r\n                    return newError;\r\n                }, true);\r\n                thisInterpreter.setProperty(constructor, 'prototype', thisInterpreter.createObject(thisInterpreter.ERROR));\r\n                thisInterpreter.setProperty(constructor.properties['prototype'], 'name', name, Interpreter.NONENUMERABLE_DESCRIPTOR);\r\n                thisInterpreter.setProperty(scope, name, constructor);\r\n                return constructor;\r\n            };\r\n            this.EVAL_ERROR = createErrorSubclass('EvalError');\r\n            this.RANGE_ERROR = createErrorSubclass('RangeError');\r\n            this.REFERENCE_ERROR = createErrorSubclass('ReferenceError');\r\n            this.SYNTAX_ERROR = createErrorSubclass('SyntaxError');\r\n            this.TYPE_ERROR = createErrorSubclass('TypeError');\r\n            this.URI_ERROR = createErrorSubclass('URIError');\r\n        };\r\n        ;\r\n        /**\r\n         * Initialize Math object.\r\n         * @param {!Interpreter.MyObject} scope Global scope.\r\n         */\r\n        Interpreter.prototype.initMath = function (scope) {\r\n            var thisInterpreter = this;\r\n            var myMath = this.createObjectProto(this.OBJECT_PROTO);\r\n            this.setProperty(scope, 'Math', myMath);\r\n            var mathConsts = ['E', 'LN2', 'LN10', 'LOG2E', 'LOG10E', 'PI',\r\n                'SQRT1_2', 'SQRT2'];\r\n            for (var i = 0; i < mathConsts.length; i++) {\r\n                this.setProperty(myMath, mathConsts[i], Math[mathConsts[i]], Interpreter.READONLY_NONENUMERABLE_DESCRIPTOR);\r\n            }\r\n            var numFunctions = ['abs', 'acos', 'asin', 'atan', 'atan2', 'ceil', 'cos',\r\n                'exp', 'floor', 'log', 'max', 'min', 'pow', 'random',\r\n                'round', 'sin', 'sqrt', 'tan'];\r\n            for (var i = 0; i < numFunctions.length; i++) {\r\n                this.setProperty(myMath, numFunctions[i], this.createNativeFunction(Math[numFunctions[i]], false), Interpreter.NONENUMERABLE_DESCRIPTOR);\r\n            }\r\n        };\r\n        ;\r\n        /**\r\n         * Initialize JSON object.\r\n         * @param {!Interpreter.MyObject} scope Global scope.\r\n         */\r\n        Interpreter.prototype.initJSON = function (scope) {\r\n            var thisInterpreter = this;\r\n            var myJSON = thisInterpreter.createObjectProto(this.OBJECT_PROTO);\r\n            this.setProperty(scope, 'JSON', myJSON);\r\n            var wrapper = function (text) {\r\n                try {\r\n                    var nativeObj = JSON.parse(text.toString());\r\n                }\r\n                catch (e) {\r\n                    thisInterpreter.throwException(thisInterpreter.SYNTAX_ERROR, e.message);\r\n                }\r\n                return thisInterpreter.nativeToPseudo(nativeObj);\r\n            };\r\n            this.setProperty(myJSON, 'parse', this.createNativeFunction(wrapper, false));\r\n            wrapper = function (value) {\r\n                var nativeObj = thisInterpreter.pseudoToNative(value);\r\n                try {\r\n                    var str = JSON.stringify(nativeObj);\r\n                }\r\n                catch (e) {\r\n                    thisInterpreter.throwException(thisInterpreter.TYPE_ERROR, e.message);\r\n                }\r\n                return str;\r\n            };\r\n            this.setProperty(myJSON, 'stringify', this.createNativeFunction(wrapper, false));\r\n        };\r\n        ;\r\n        /**\r\n         * Is an object of a certain class?\r\n         * @param {Interpreter.MyValue} child Object to check.\r\n         * @param {Interpreter.MyObject} constructor Constructor of object.\r\n         * @return {boolean} True if object is the class or inherits from it.\r\n         *     False otherwise.\r\n         */\r\n        Interpreter.prototype.isa = function (child, constructor) {\r\n            if (child === null || child === undefined || !constructor) {\r\n                return false;\r\n            }\r\n            var proto = constructor.properties['prototype'];\r\n            if (child === proto) {\r\n                return true;\r\n            }\r\n            // The first step up the prototype chain is harder since the child might be\r\n            // a primitive value.  Subsequent steps can just follow the .proto property.\r\n            var childObj = this.getPrototype(child);\r\n            while (childObj) {\r\n                if (childObj === proto) {\r\n                    return true;\r\n                }\r\n                childObj = childObj.proto;\r\n            }\r\n            return false;\r\n        };\r\n        ;\r\n        /**\r\n         * Is a value a legal integer for an array length?\r\n         * @param {Interpreter.MyValue} x Value to check.\r\n         * @return {number} Zero, or a positive integer if the value can be\r\n         *     converted to such.  NaN otherwise.\r\n         */\r\n        Interpreter.legalArrayLength = function (x) {\r\n            var n = x >>> 0;\r\n            // Array length must be between 0 and 2^32-1 (inclusive).\r\n            return (n === Number(x)) ? n : NaN;\r\n        };\r\n        ;\r\n        /**\r\n         * Is a value a legal integer for an array index?\r\n         * @param {Interpreter.MyValue} x Value to check.\r\n         * @return {number} Zero, or a positive integer if the value can be\r\n         *     converted to such.  NaN otherwise.\r\n         */\r\n        Interpreter.legalArrayIndex = function (x) {\r\n            var n = x >>> 0;\r\n            // Array index cannot be 2^32-1, otherwise length would be 2^32.\r\n            // 0xffffffff is 2^32-1.\r\n            return (String(n) === String(x) && n !== 0xffffffff) ? n : NaN;\r\n        };\r\n        ;\r\n        /**\r\n         * Create a new data object based on a constructor's prototype.\r\n         * @param {Interpreter.MyObject} constructor Parent constructor function,\r\n         *     or null if scope object.\r\n         * @return {!Interpreter.MyObject} New data object.\r\n         */\r\n        Interpreter.prototype.createObject = function (constructor) {\r\n            return this.createObjectProto(constructor &&\r\n                constructor.properties['prototype']);\r\n        };\r\n        ;\r\n        /**\r\n         * Create a new data object based on a prototype.\r\n         * @param {Interpreter.MyObject} proto Prototype object.\r\n         * @return {!Interpreter.MyObject} New data object.\r\n         */\r\n        Interpreter.prototype.createObjectProto = function (proto) {\r\n            var obj = new Interpreter.MyObject(proto);\r\n            // Functions have prototype objects.\r\n            if (this.isa(obj, this.FUNCTION)) {\r\n                this.setProperty(obj, 'prototype', this.createObjectProto(this.OBJECT_PROTO || null));\r\n                obj.class = 'Function';\r\n            }\r\n            // Arrays have length.\r\n            if (this.isa(obj, this.ARRAY)) {\r\n                this.setProperty(obj, 'length', 0, { configurable: false, enumerable: false, writable: true });\r\n                obj.class = 'Array';\r\n            }\r\n            if (this.isa(obj, this.ERROR)) {\r\n                obj.class = 'Error';\r\n            }\r\n            return obj;\r\n        };\r\n        ;\r\n        /**\r\n         * Initialize a pseudo regular expression object based on a native regular\r\n         * expression object.\r\n         * @param {!Interpreter.MyObject} pseudoRegexp The existing object to set.\r\n         * @param {!RegExp} nativeRegexp The native regular expression.\r\n         */\r\n        Interpreter.prototype.populateRegExp = function (pseudoRegexp, nativeRegexp) {\r\n            pseudoRegexp.data = nativeRegexp;\r\n            // lastIndex is settable, all others are read-only attributes\r\n            this.setProperty(pseudoRegexp, 'lastIndex', nativeRegexp.lastIndex, Interpreter.NONENUMERABLE_DESCRIPTOR);\r\n            this.setProperty(pseudoRegexp, 'source', nativeRegexp.source, Interpreter.READONLY_NONENUMERABLE_DESCRIPTOR);\r\n            this.setProperty(pseudoRegexp, 'global', nativeRegexp.global, Interpreter.READONLY_NONENUMERABLE_DESCRIPTOR);\r\n            this.setProperty(pseudoRegexp, 'ignoreCase', nativeRegexp.ignoreCase, Interpreter.READONLY_NONENUMERABLE_DESCRIPTOR);\r\n            this.setProperty(pseudoRegexp, 'multiline', nativeRegexp.multiline, Interpreter.READONLY_NONENUMERABLE_DESCRIPTOR);\r\n        };\r\n        ;\r\n        /**\r\n         * Create a new function.\r\n         * @param {!Object} node AST node defining the function.\r\n         * @param {!Object} scope Parent scope.\r\n         * @return {!Interpreter.MyObject} New function.\r\n         */\r\n        Interpreter.prototype.createFunction = function (node, scope) {\r\n            var func = this.createObjectProto(this.FUNCTION_PROTO);\r\n            func.parentScope = scope;\r\n            func.node = node;\r\n            this.setProperty(func, 'length', func.node['params'].length, Interpreter.READONLY_DESCRIPTOR);\r\n            return func;\r\n        };\r\n        ;\r\n        /**\r\n         * Create a new native function.\r\n         * @param {!Function} nativeFunc JavaScript function.\r\n         * @param {boolean=} opt_constructor If true, the function's\r\n         * prototype will have its constructor property set to the function.\r\n         * If false, the function cannot be called as a constructor (e.g. escape).\r\n         * Defaults to undefined.\r\n         * @return {!Interpreter.MyObject} New function.\r\n         */\r\n        Interpreter.prototype.createNativeFunction = function (nativeFunc, opt_constructor) {\r\n            var func = this.createObjectProto(this.FUNCTION_PROTO);\r\n            func.nativeFunc = nativeFunc;\r\n            nativeFunc.id = this.functionCounter_++;\r\n            this.setProperty(func, 'length', nativeFunc.length, Interpreter.READONLY_DESCRIPTOR);\r\n            if (opt_constructor) {\r\n                this.setProperty(func.properties['prototype'], 'constructor', func, Interpreter.NONENUMERABLE_DESCRIPTOR);\r\n            }\r\n            else if (opt_constructor === false) {\r\n                func.illegalConstructor = true;\r\n                this.setProperty(func, 'prototype', undefined);\r\n            }\r\n            return func;\r\n        };\r\n        ;\r\n        /**\r\n         * Create a new native asynchronous function.\r\n         * @param {!Function} asyncFunc JavaScript function.\r\n         * @return {!Interpreter.MyObject} New function.\r\n         */\r\n        Interpreter.prototype.createAsyncFunction = function (asyncFunc) {\r\n            var func = this.createObjectProto(this.FUNCTION_PROTO);\r\n            func.asyncFunc = asyncFunc;\r\n            asyncFunc.id = this.functionCounter_++;\r\n            this.setProperty(func, 'length', asyncFunc.length, Interpreter.READONLY_DESCRIPTOR);\r\n            return func;\r\n        };\r\n        ;\r\n        /**\r\n         * Converts from a native JS object or value to a JS interpreter object.\r\n         * Can handle JSON-style values.\r\n         * @param {*} nativeObj The native JS object to be converted.\r\n         * @return {Interpreter.MyValue} The equivalent JS interpreter object.\r\n         */\r\n        Interpreter.prototype.nativeToPseudo = function (nativeObj) {\r\n            if (typeof nativeObj === 'boolean' ||\r\n                typeof nativeObj === 'number' ||\r\n                typeof nativeObj === 'string' ||\r\n                nativeObj === null || nativeObj === undefined) {\r\n                return nativeObj;\r\n            }\r\n            if (nativeObj instanceof RegExp) {\r\n                var pseudoRegexp = this.createObjectProto(this.REGEXP_PROTO);\r\n                this.populateRegExp(pseudoRegexp, nativeObj);\r\n                return pseudoRegexp;\r\n            }\r\n            if (nativeObj instanceof Function) {\r\n                var interpreter = this;\r\n                var wrapper = function () {\r\n                    return interpreter.nativeToPseudo(nativeObj.apply(interpreter, Array.prototype.slice.call(arguments)\r\n                        .map(function (i) {\r\n                        return interpreter.pseudoToNative(i);\r\n                    })));\r\n                };\r\n                return this.createNativeFunction(wrapper, undefined);\r\n            }\r\n            var pseudoObj;\r\n            if (Array.isArray(nativeObj)) {\r\n                pseudoObj = this.createObjectProto(this.ARRAY_PROTO);\r\n                for (var i = 0; i < nativeObj.length; i++) {\r\n                    if (i in nativeObj) {\r\n                        this.setProperty(pseudoObj, i, this.nativeToPseudo(nativeObj[i]));\r\n                    }\r\n                }\r\n            }\r\n            else {\r\n                pseudoObj = this.createObjectProto(this.OBJECT_PROTO);\r\n                for (var key in nativeObj) {\r\n                    this.setProperty(pseudoObj, key, this.nativeToPseudo(nativeObj[key]));\r\n                }\r\n            }\r\n            return pseudoObj;\r\n        };\r\n        ;\r\n        /**\r\n         * Converts from a JS interpreter object to native JS object.\r\n         * Can handle JSON-style values, plus cycles.\r\n         * @param {Interpreter.MyValue} pseudoObj The JS interpreter object to be\r\n         * converted.\r\n         * @param {Object=} opt_cycles Cycle detection (used in recursive calls).\r\n         * @return {*} The equivalent native JS object or value.\r\n         */\r\n        Interpreter.prototype.pseudoToNative = function (pseudoObj, opt_cycles) {\r\n            if (typeof pseudoObj === 'boolean' ||\r\n                typeof pseudoObj === 'number' ||\r\n                typeof pseudoObj === 'string' ||\r\n                pseudoObj === null || pseudoObj === undefined) {\r\n                return pseudoObj;\r\n            }\r\n            if (this.isa(pseudoObj, this.REGEXP)) {\r\n                return pseudoObj.data;\r\n            }\r\n            var cycles = opt_cycles || {\r\n                pseudo: [],\r\n                native: []\r\n            };\r\n            var i = cycles.pseudo.indexOf(pseudoObj);\r\n            if (i !== -1) {\r\n                return cycles.native[i];\r\n            }\r\n            cycles.pseudo.push(pseudoObj);\r\n            var nativeObj;\r\n            if (this.isa(pseudoObj, this.ARRAY)) {\r\n                nativeObj = [];\r\n                cycles.native.push(nativeObj);\r\n                var length = this.getProperty(pseudoObj, 'length');\r\n                for (var i = 0; i < length; i++) {\r\n                    if (this.hasProperty(pseudoObj, i)) {\r\n                        nativeObj[i] =\r\n                            this.pseudoToNative(this.getProperty(pseudoObj, i), cycles);\r\n                    }\r\n                }\r\n            }\r\n            else {\r\n                nativeObj = {};\r\n                cycles.native.push(nativeObj);\r\n                var val;\r\n                for (var key in pseudoObj.properties) {\r\n                    val = pseudoObj.properties[key];\r\n                    nativeObj[key] = this.pseudoToNative(val, cycles);\r\n                }\r\n            }\r\n            cycles.pseudo.pop();\r\n            cycles.native.pop();\r\n            return nativeObj;\r\n        };\r\n        ;\r\n        /**\r\n         * Look up the prototype for this value.\r\n         * @param {Interpreter.MyValue} value Data object.\r\n         * @return {Interpreter.MyObject} Prototype object, null if none.\r\n         */\r\n        Interpreter.prototype.getPrototype = function (value) {\r\n            switch (typeof value) {\r\n                case 'number':\r\n                    return this.NUMBER.properties['prototype'];\r\n                case 'boolean':\r\n                    return this.BOOLEAN.properties['prototype'];\r\n                case 'string':\r\n                    return this.STRING.properties['prototype'];\r\n            }\r\n            if (value) {\r\n                return value.proto;\r\n            }\r\n            return null;\r\n        };\r\n        ;\r\n        /**\r\n         * Fetch a property value from a data object.\r\n         * @param {Interpreter.MyValue} obj Data object.\r\n         * @param {Interpreter.MyValue} name Name of property.\r\n         * @return {Interpreter.MyValue} Property value (may be undefined).\r\n         */\r\n        Interpreter.prototype.getProperty = function (obj, name) {\r\n            name = String(name);\r\n            if (obj === undefined || obj === null) {\r\n                this.throwException(this.TYPE_ERROR, \"Cannot read property '\" + name + \"' of \" + obj);\r\n            }\r\n            if (name === 'length') {\r\n                // Special cases for magic length property.\r\n                if (this.isa(obj, this.STRING)) {\r\n                    return String(obj).length;\r\n                }\r\n            }\r\n            else if (name.charCodeAt(0) < 0x40) {\r\n                // Might have numbers in there?\r\n                // Special cases for string array indexing\r\n                if (this.isa(obj, this.STRING)) {\r\n                    var n = Interpreter.legalArrayIndex(name);\r\n                    if (!isNaN(n) && n < String(obj).length) {\r\n                        return String(obj)[n];\r\n                    }\r\n                }\r\n            }\r\n            do {\r\n                var myObj = obj;\r\n                if (myObj.properties && name in myObj.properties) {\r\n                    var getter = myObj.getter[name];\r\n                    if (getter) {\r\n                        // Flag this function as being a getter and thus needing immediate\r\n                        // execution (rather than being the value of the property).\r\n                        getter.isGetter = true;\r\n                        return getter;\r\n                    }\r\n                    return myObj.properties[name];\r\n                }\r\n            } while ((obj = this.getPrototype(obj)));\r\n            return undefined;\r\n        };\r\n        ;\r\n        /**\r\n         * Does the named property exist on a data object.\r\n         * @param {Interpreter.MyValue} obj Data object.\r\n         * @param {Interpreter.MyValue} name Name of property.\r\n         * @return {boolean} True if property exists.\r\n         */\r\n        Interpreter.prototype.hasProperty = function (obj, name) {\r\n            if (!obj['isObject']) {\r\n                throw TypeError('Primitive data type has no properties');\r\n            }\r\n            name = String(name);\r\n            if (name === 'length' && this.isa(obj, this.STRING)) {\r\n                return true;\r\n            }\r\n            if (this.isa(obj, this.STRING)) {\r\n                var n = Interpreter.legalArrayIndex(name);\r\n                if (!isNaN(n) && n < String(obj).length) {\r\n                    return true;\r\n                }\r\n            }\r\n            do {\r\n                var myObj = obj;\r\n                if (myObj.properties && name in myObj.properties) {\r\n                    return true;\r\n                }\r\n            } while ((obj = this.getPrototype(obj)));\r\n            return false;\r\n        };\r\n        ;\r\n        /**\r\n         * Set a property value on a data object.\r\n         * @param {!Interpreter.MyObject} obj Data object.\r\n         * @param {Interpreter.MyValue} name Name of property.\r\n         * @param {Interpreter.MyValue|ReferenceError} value New property value.\r\n         *   Use ReferenceError if value is handled by descriptor instead.\r\n         * @param {Object=} opt_descriptor Optional descriptor object.\r\n         * @return {!Interpreter.MyObject|undefined} Returns a setter function if one\r\n         *     needs to be called, otherwise undefined.\r\n         */\r\n        Interpreter.prototype.setProperty = function (obj, name, value, opt_descriptor) {\r\n            name = String(name);\r\n            if (obj === undefined || obj === null) {\r\n                this.throwException(this.TYPE_ERROR, \"Cannot set property '\" + name + \"' of \" + obj);\r\n            }\r\n            if (opt_descriptor && ('get' in opt_descriptor || 'set' in opt_descriptor) &&\r\n                ('value' in opt_descriptor || 'writable' in opt_descriptor)) {\r\n                this.throwException(this.TYPE_ERROR, 'Invalid property descriptor. ' +\r\n                    'Cannot both specify accessors and a value or writable attribute');\r\n            }\r\n            var strict = !this.stateStack || this.getScope().strict;\r\n            if (!obj.isObject) {\r\n                if (strict) {\r\n                    this.throwException(this.TYPE_ERROR, \"Can't create property '\" + name +\r\n                        \"' on '\" + obj + \"'\");\r\n                }\r\n                return;\r\n            }\r\n            if (this.isa(obj, this.STRING)) {\r\n                var n = Interpreter.legalArrayIndex(name);\r\n                if (name === 'length' || (!isNaN(n) && n < String(obj).length)) {\r\n                    // Can't set length or letters on String objects.\r\n                    if (strict) {\r\n                        this.throwException(this.TYPE_ERROR, \"Cannot assign to read only \" +\r\n                            \"property '\" + name + \"' of String '\" + obj.data + \"'\");\r\n                    }\r\n                    return;\r\n                }\r\n            }\r\n            if (obj.class === 'Array') {\r\n                // Arrays have a magic length variable that is bound to the elements.\r\n                var length = obj.properties.length;\r\n                var i;\r\n                if (name === 'length') {\r\n                    // Delete elements if length is smaller.\r\n                    value = Interpreter.legalArrayLength(value);\r\n                    if (isNaN(value)) {\r\n                        this.throwException(this.RANGE_ERROR, 'Invalid array length');\r\n                    }\r\n                    if (value < length) {\r\n                        for (i in obj.properties) {\r\n                            i = Interpreter.legalArrayIndex(i);\r\n                            if (!isNaN(i) && value <= i) {\r\n                                delete obj.properties[i];\r\n                            }\r\n                        }\r\n                    }\r\n                }\r\n                else if (!isNaN(i = Interpreter.legalArrayIndex(name))) {\r\n                    // Increase length if this index is larger.\r\n                    obj.properties.length = Math.max(length, i + 1);\r\n                }\r\n            }\r\n            if (obj.preventExtensions && !(name in obj.properties)) {\r\n                if (strict) {\r\n                    this.throwException(this.TYPE_ERROR, \"Can't add property '\" + name +\r\n                        \"', object is not extensible\");\r\n                }\r\n                return;\r\n            }\r\n            if (opt_descriptor) {\r\n                // Define the property.\r\n                if ('get' in opt_descriptor) {\r\n                    if (opt_descriptor.get) {\r\n                        obj.getter[name] = opt_descriptor.get;\r\n                    }\r\n                    else {\r\n                        delete obj.getter[name];\r\n                    }\r\n                }\r\n                if ('set' in opt_descriptor) {\r\n                    if (opt_descriptor.set) {\r\n                        obj.setter[name] = opt_descriptor.set;\r\n                    }\r\n                    else {\r\n                        delete obj.setter[name];\r\n                    }\r\n                }\r\n                var descriptor = {};\r\n                if ('configurable' in opt_descriptor) {\r\n                    descriptor.configurable = opt_descriptor.configurable;\r\n                }\r\n                if ('enumerable' in opt_descriptor) {\r\n                    descriptor.enumerable = opt_descriptor.enumerable;\r\n                }\r\n                if ('writable' in opt_descriptor) {\r\n                    descriptor.writable = opt_descriptor.writable;\r\n                    delete obj.getter[name];\r\n                    delete obj.setter[name];\r\n                }\r\n                if ('value' in opt_descriptor) {\r\n                    descriptor.value = opt_descriptor.value;\r\n                    delete obj.getter[name];\r\n                    delete obj.setter[name];\r\n                }\r\n                else if (value !== ReferenceError) {\r\n                    descriptor.value = value;\r\n                    delete obj.getter[name];\r\n                    delete obj.setter[name];\r\n                }\r\n                try {\r\n                    Object.defineProperty(obj.properties, name, descriptor);\r\n                }\r\n                catch (e) {\r\n                    this.throwException(this.TYPE_ERROR, 'Cannot redefine property: ' + name);\r\n                }\r\n            }\r\n            else {\r\n                // Set the property.\r\n                if (value === ReferenceError) {\r\n                    throw ReferenceError('Value not specified.');\r\n                }\r\n                // Determine the parent (possibly self) where the property is defined.\r\n                var defObj = obj;\r\n                while (!(name in defObj.properties)) {\r\n                    defObj = this.getPrototype(defObj);\r\n                    if (!defObj) {\r\n                        // This is a new property.\r\n                        defObj = obj;\r\n                        break;\r\n                    }\r\n                }\r\n                if (defObj.setter && defObj.setter[name]) {\r\n                    return defObj.setter[name];\r\n                }\r\n                if (defObj.getter && defObj.getter[name]) {\r\n                    if (strict) {\r\n                        this.throwException(this.TYPE_ERROR, \"Cannot set property '\" + name +\r\n                            \"' of object '\" + obj + \"' which only has a getter\");\r\n                    }\r\n                }\r\n                else {\r\n                    // No setter, simple assignment.\r\n                    try {\r\n                        obj.properties[name] = value;\r\n                    }\r\n                    catch (e) {\r\n                        if (strict) {\r\n                            this.throwException(this.TYPE_ERROR, \"Cannot assign to read only \" +\r\n                                \"property '\" + name + \"' of object '\" + obj + \"'\");\r\n                        }\r\n                    }\r\n                }\r\n            }\r\n        };\r\n        ;\r\n        /**\r\n         * Convenience method for adding a native function as a non-enumerable property\r\n         * onto an object's prototype.\r\n         * @param {!Interpreter.MyObject} obj Data object.\r\n         * @param {Interpreter.MyValue} name Name of property.\r\n         * @param {!Function} wrapper Function object.\r\n         */\r\n        Interpreter.prototype.setNativeFunctionPrototype = function (obj, name, wrapper) {\r\n            this.setProperty(obj.properties['prototype'], name, this.createNativeFunction(wrapper, false), Interpreter.NONENUMERABLE_DESCRIPTOR);\r\n        };\r\n        ;\r\n        /**\r\n         * Returns the current scope from the stateStack.\r\n         * @return {!Interpreter.MyObject} Current scope dictionary.\r\n         */\r\n        Interpreter.prototype.getScope = function () {\r\n            var scope = this.stateStack[this.stateStack.length - 1].scope;\r\n            if (!scope) {\r\n                throw Error('No scope found.');\r\n            }\r\n            return scope;\r\n        };\r\n        ;\r\n        /**\r\n         * Create a new scope dictionary.\r\n         * @param {!Object} node AST node defining the scope container\r\n         *     (e.g. a function).\r\n         * @param {Interpreter.MyObject} parentScope Scope to link to.\r\n         * @return {!Interpreter.MyObject} New scope.\r\n         */\r\n        Interpreter.prototype.createScope = function (node, parentScope) {\r\n            var scope = this.createObjectProto(null);\r\n            scope.parentScope = parentScope;\r\n            if (!parentScope) {\r\n                this.initGlobalScope(scope);\r\n            }\r\n            this.populateScope_(node, scope);\r\n            // Determine if this scope starts with 'use strict'.\r\n            scope.strict = false;\r\n            if (parentScope && parentScope.strict) {\r\n                scope.strict = true;\r\n            }\r\n            else {\r\n                var firstNode = node['body'] && node['body'][0];\r\n                if (firstNode && firstNode.expression &&\r\n                    firstNode.expression['type'] === 'Literal' &&\r\n                    firstNode.expression.value === 'use strict') {\r\n                    scope.strict = true;\r\n                }\r\n            }\r\n            return scope;\r\n        };\r\n        ;\r\n        /**\r\n         * Create a new special scope dictionary. Similar to createScope(), but\r\n         * doesn't assume that the scope is for a function body.\r\n         * This is used for 'catch' clauses and 'with' statements.\r\n         * @param {!Interpreter.MyObject} parentScope Scope to link to.\r\n         * @param {Interpreter.MyObject=} opt_scope Optional object to transform into\r\n         *     scope.\r\n         * @return {!Interpreter.MyObject} New scope.\r\n         */\r\n        Interpreter.prototype.createSpecialScope = function (parentScope, opt_scope) {\r\n            if (!parentScope) {\r\n                throw Error('parentScope required');\r\n            }\r\n            var scope = opt_scope || this.createObjectProto(null);\r\n            scope.parentScope = parentScope;\r\n            scope.strict = parentScope.strict;\r\n            return scope;\r\n        };\r\n        ;\r\n        /**\r\n         * Retrieves a value from the scope chain.\r\n         * @param {string} name Name of variable.\r\n         * @return {Interpreter.MyValue} Any value.\r\n         *   May be flagged as being a getter and thus needing immediate execution\r\n         *   (rather than being the value of the property).\r\n         */\r\n        Interpreter.prototype.getValueFromScope = function (name) {\r\n            var scope = this.getScope();\r\n            while (scope && scope !== this.global) {\r\n                if (name in scope.properties) {\r\n                    return scope.properties[name];\r\n                }\r\n                scope = scope.parentScope;\r\n            }\r\n            // The root scope is also an object which has inherited properties and\r\n            // could also have getters.\r\n            if (scope === this.global && this.hasProperty(scope, name)) {\r\n                return this.getProperty(scope, name);\r\n            }\r\n            // Typeof operator is unique: it can safely look at non-defined variables.\r\n            var prevNode = this.stateStack[this.stateStack.length - 1].node;\r\n            if (prevNode['type'] === 'UnaryExpression' &&\r\n                prevNode['operator'] === 'typeof') {\r\n                return undefined;\r\n            }\r\n            this.throwException(this.REFERENCE_ERROR, name + ' is not defined');\r\n        };\r\n        ;\r\n        /**\r\n         * Sets a value to the current scope.\r\n         * @param {string} name Name of variable.\r\n         * @param {Interpreter.MyValue} value Value.\r\n         * @return {!Interpreter.MyObject|undefined} Returns a setter function if one\r\n         *     needs to be called, otherwise undefined.\r\n         */\r\n        Interpreter.prototype.setValueToScope = function (name, value) {\r\n            var scope = this.getScope();\r\n            var strict = scope.strict;\r\n            while (scope && scope !== this.global) {\r\n                if (name in scope.properties) {\r\n                    scope.properties[name] = value;\r\n                    return undefined;\r\n                }\r\n                scope = scope.parentScope;\r\n            }\r\n            // The root scope is also an object which has readonly properties and\r\n            // could also have setters.\r\n            if (scope === this.global && (!strict || this.hasProperty(scope, name))) {\r\n                return this.setProperty(scope, name, value);\r\n            }\r\n            this.throwException(this.REFERENCE_ERROR, name + ' is not defined');\r\n        };\r\n        ;\r\n        /**\r\n         * Create a new scope for the given node.\r\n         * @param {!Object} node AST node (program or function).\r\n         * @param {!Interpreter.MyObject} scope Scope dictionary to populate.\r\n         * @private\r\n         */\r\n        Interpreter.prototype.populateScope_ = function (node, scope) {\r\n            if (node['type'] === 'VariableDeclaration') {\r\n                for (var i = 0; i < node['declarations'].length; i++) {\r\n                    this.setProperty(scope, node['declarations'][i]['id']['name'], undefined, Interpreter.VARIABLE_DESCRIPTOR);\r\n                }\r\n            }\r\n            else if (node['type'] === 'FunctionDeclaration') {\r\n                this.setProperty(scope, node['id']['name'], this.createFunction(node, scope), Interpreter.VARIABLE_DESCRIPTOR);\r\n                return; // Do not recurse into function.\r\n            }\r\n            else if (node['type'] === 'FunctionExpression') {\r\n                return; // Do not recurse into function.\r\n            }\r\n            else if (node['type'] === 'ExpressionStatement') {\r\n                return; // Expressions can't contain variable/function declarations.\r\n            }\r\n            var nodeClass = node['constructor'];\r\n            for (var name in node) {\r\n                var prop = node[name];\r\n                if (prop && typeof prop === 'object') {\r\n                    if (Array.isArray(prop)) {\r\n                        for (var i = 0; i < prop.length; i++) {\r\n                            if (prop[i] && prop[i].constructor === nodeClass) {\r\n                                this.populateScope_(prop[i], scope);\r\n                            }\r\n                        }\r\n                    }\r\n                    else {\r\n                        if (prop.constructor === nodeClass) {\r\n                            this.populateScope_(prop, scope);\r\n                        }\r\n                    }\r\n                }\r\n            }\r\n        };\r\n        ;\r\n        /**\r\n         * Remove start and end values from AST, or set start and end values to a\r\n         * constant value.  Used to remove highlighting from polyfills and to set\r\n         * highlighting in an eval to cover the entire eval expression.\r\n         * @param {!Object} node AST node.\r\n         * @param {number=} start Starting character of all nodes, or undefined.\r\n         * @param {number=} end Ending character of all nodes, or undefined.\r\n         * @private\r\n         */\r\n        Interpreter.prototype.stripLocations_ = function (node, start, end) {\r\n            if (start) {\r\n                node['start'] = start;\r\n            }\r\n            else {\r\n                delete node['start'];\r\n            }\r\n            if (end) {\r\n                node['end'] = end;\r\n            }\r\n            else {\r\n                delete node['end'];\r\n            }\r\n            for (var name in node) {\r\n                if (node.hasOwnProperty(name)) {\r\n                    var prop = node[name];\r\n                    if (prop && typeof prop === 'object') {\r\n                        this.stripLocations_(prop, start, end);\r\n                    }\r\n                }\r\n            }\r\n        };\r\n        ;\r\n        /**\r\n         * Is the current state directly being called with as a construction with 'new'.\r\n         * @return {boolean} True if 'new foo()', false if 'foo()'.\r\n         */\r\n        Interpreter.prototype.calledWithNew = function () {\r\n            return this.stateStack[this.stateStack.length - 1].isConstructor;\r\n        };\r\n        ;\r\n        /**\r\n         * Gets a value from the scope chain or from an object property.\r\n         * @param {!Array} ref Name of variable or object/propname tuple.\r\n         * @return {Interpreter.MyValue} Any value.\r\n         *   May be flagged as being a getter and thus needing immediate execution\r\n         *   (rather than being the value of the property).\r\n         */\r\n        Interpreter.prototype.getValue = function (ref) {\r\n            if (ref[0] === Interpreter.SCOPE_REFERENCE) {\r\n                // A null/varname variable lookup.\r\n                return this.getValueFromScope(ref[1]);\r\n            }\r\n            else {\r\n                // An obj/prop components tuple (foo.bar).\r\n                return this.getProperty(ref[0], ref[1]);\r\n            }\r\n        };\r\n        ;\r\n        /**\r\n         * Sets a value to the scope chain or to an object property.\r\n         * @param {!Array} ref Name of variable or object/propname tuple.\r\n         * @param {Interpreter.MyValue} value Value.\r\n         * @return {!Interpreter.MyObject|undefined} Returns a setter function if one\r\n         *     needs to be called, otherwise undefined.\r\n         */\r\n        Interpreter.prototype.setValue = function (ref, value) {\r\n            if (ref[0] === Interpreter.SCOPE_REFERENCE) {\r\n                // A null/varname variable lookup.\r\n                return this.setValueToScope(ref[1], value);\r\n            }\r\n            else {\r\n                // An obj/prop components tuple (foo.bar).\r\n                return this.setProperty(ref[0], ref[1], value);\r\n            }\r\n        };\r\n        ;\r\n        /**\r\n         * Throw an exception in the interpreter that can be handled by an\r\n         * interpreter try/catch statement.  If unhandled, a real exception will\r\n         * be thrown.  Can be called with either an error class and a message, or\r\n         * with an actual object to be thrown.\r\n         * @param {!Interpreter.MyObject} errorClass Type of error (if message is\r\n         *   provided) or the value to throw (if no message).\r\n         * @param {string=} opt_message Message being thrown.\r\n         */\r\n        Interpreter.prototype.throwException = function (errorClass, opt_message) {\r\n            if (opt_message === undefined) {\r\n                var error = errorClass; // This is a value to throw, not an error class.\r\n            }\r\n            else {\r\n                var error = this.createObject(errorClass);\r\n                this.setProperty(error, 'message', opt_message, Interpreter.NONENUMERABLE_DESCRIPTOR);\r\n            }\r\n            this.executeException(error);\r\n            // Abort anything related to the current step.\r\n            throw Interpreter.STEP_ERROR;\r\n        };\r\n        ;\r\n        /**\r\n         * Throw an exception in the interpreter that can be handled by a\r\n         * interpreter try/catch statement.  If unhandled, a real exception will\r\n         * be thrown.\r\n         * @param {!Interpreter.MyObject} error Error object to execute.\r\n         */\r\n        Interpreter.prototype.executeException = function (error) {\r\n            // Search for a try statement.\r\n            var stateStack = this.stateStack.slice();\r\n            do {\r\n                this.stateStack.pop();\r\n                var state = this.stateStack[this.stateStack.length - 1];\r\n                if (state.node['type'] === 'TryStatement') {\r\n                    state.throwValue = error;\r\n                    return;\r\n                }\r\n            } while (state && state.node['type'] !== 'Program');\r\n            // Throw a real error.\r\n            var realError;\r\n            if (this.isa(error, this.ERROR)) {\r\n                var errorTable = {\r\n                    'EvalError': EvalError,\r\n                    'RangeError': RangeError,\r\n                    'ReferenceError': ReferenceError,\r\n                    'SyntaxError': SyntaxError,\r\n                    'TypeError': TypeError,\r\n                    'URIError': URIError\r\n                };\r\n                var name = this.getProperty(error, 'name').toString();\r\n                var message = this.getProperty(error, 'message').valueOf();\r\n                var type = errorTable[name] || Error;\r\n                realError = type(message);\r\n            }\r\n            else {\r\n                realError = String(error);\r\n            }\r\n            this.stateStack = stateStack; // recover the original state stack\r\n            throw realError;\r\n        };\r\n        ;\r\n        /**\r\n         * Create a call to a getter function.\r\n         * @param {!Interpreter.MyObject} func Function to execute.\r\n         * @param {!Interpreter.MyObject|!Array} left\r\n         *     Name of variable or object/propname tuple.\r\n         * @private\r\n         */\r\n        Interpreter.prototype.createGetter_ = function (func, left) {\r\n            // Normally 'this' will be specified as the object component (o.x).\r\n            // Sometimes 'this' is explicitly provided (o).\r\n            var funcThis = Array.isArray(left) ? left[0] : left;\r\n            var node = new this.nodeConstructor();\r\n            node['type'] = 'CallExpression';\r\n            var state = new Interpreter.MyState(node, this.stateStack[this.stateStack.length - 1].scope);\r\n            state.doneCallee_ = true;\r\n            state.funcThis_ = funcThis;\r\n            state.func_ = func;\r\n            state.doneArgs_ = true;\r\n            state.arguments_ = [];\r\n            return state;\r\n        };\r\n        ;\r\n        /**\r\n         * Create a call to a setter function.\r\n         * @param {!Interpreter.MyObject} func Function to execute.\r\n         * @param {!Interpreter.MyObject|!Array} left\r\n         *     Name of variable or object/propname tuple.\r\n         * @param {Interpreter.MyValue} value Value to set.\r\n         * @private\r\n         */\r\n        Interpreter.prototype.createSetter_ = function (func, left, value) {\r\n            // Normally 'this' will be specified as the object component (o.x).\r\n            // Sometimes 'this' is implicitly the global object (x).\r\n            var funcThis = Array.isArray(left) ? left[0] : this.global;\r\n            var node = new this.nodeConstructor();\r\n            node['type'] = 'CallExpression';\r\n            var state = new Interpreter.MyState(node, this.stateStack[this.stateStack.length - 1].scope);\r\n            state.doneCallee_ = true;\r\n            state.funcThis_ = funcThis;\r\n            state.func_ = func;\r\n            state.doneArgs_ = true;\r\n            state.arguments_ = [value];\r\n            return state;\r\n        };\r\n        ;\r\n        ///////////////////////////////////////////////////////////////////////////////\r\n        // Functions to handle each node type.\r\n        ///////////////////////////////////////////////////////////////////////////////\r\n        Interpreter.prototype.stepArrayExpression = function (stack, state, node) {\r\n            var elements = node['elements'];\r\n            var n = state.n_ || 0;\r\n            if (!state.array_) {\r\n                state.array_ = this.createObjectProto(this.ARRAY_PROTO);\r\n                state.array_.properties.length = elements.length;\r\n            }\r\n            else {\r\n                this.setProperty(state.array_, n, state.value);\r\n                n++;\r\n            }\r\n            while (n < elements.length) {\r\n                // Skip missing elements - they're not defined, not undefined.\r\n                if (elements[n]) {\r\n                    state.n_ = n;\r\n                    return new Interpreter.MyState(elements[n], state.scope);\r\n                }\r\n                n++;\r\n            }\r\n            stack.pop();\r\n            stack[stack.length - 1].value = state.array_;\r\n        };\r\n        ;\r\n        Interpreter.prototype.stepAssignmentExpression = function (stack, state, node) {\r\n            if (!state.doneLeft_) {\r\n                state.doneLeft_ = true;\r\n                var nextState = new Interpreter.MyState(node['left'], state.scope);\r\n                nextState.components = true;\r\n                return nextState;\r\n            }\r\n            if (!state.doneRight_) {\r\n                if (!state.leftReference_) {\r\n                    state.leftReference_ = state.value;\r\n                }\r\n                if (state.doneGetter_) {\r\n                    state.leftValue_ = state.value;\r\n                }\r\n                if (!state.doneGetter_ && node['operator'] !== '=') {\r\n                    var leftValue = this.getValue(state.leftReference_);\r\n                    state.leftValue_ = leftValue;\r\n                    if (leftValue && typeof leftValue === 'object' && leftValue.isGetter) {\r\n                        // Clear the getter flag and call the getter function.\r\n                        leftValue.isGetter = false;\r\n                        state.doneGetter_ = true;\r\n                        var func = (leftValue);\r\n                        return this.createGetter_(func, state.leftReference_);\r\n                    }\r\n                }\r\n                state.doneRight_ = true;\r\n                return new Interpreter.MyState(node['right'], state.scope);\r\n            }\r\n            if (state.doneSetter_) {\r\n                // Return if setter function.\r\n                // Setter method on property has completed.\r\n                // Ignore its return value, and use the original set value instead.\r\n                stack.pop();\r\n                stack[stack.length - 1].value = state.doneSetter_;\r\n                return;\r\n            }\r\n            var value = state.leftValue_;\r\n            var rightValue = state.value;\r\n            switch (node['operator']) {\r\n                case '=':\r\n                    value = rightValue;\r\n                    break;\r\n                case '+=':\r\n                    value += rightValue;\r\n                    break;\r\n                case '-=':\r\n                    value -= rightValue;\r\n                    break;\r\n                case '*=':\r\n                    value *= rightValue;\r\n                    break;\r\n                case '/=':\r\n                    value /= rightValue;\r\n                    break;\r\n                case '%=':\r\n                    value %= rightValue;\r\n                    break;\r\n                case '<<=':\r\n                    value <<= rightValue;\r\n                    break;\r\n                case '>>=':\r\n                    value >>= rightValue;\r\n                    break;\r\n                case '>>>=':\r\n                    value >>>= rightValue;\r\n                    break;\r\n                case '&=':\r\n                    value &= rightValue;\r\n                    break;\r\n                case '^=':\r\n                    value ^= rightValue;\r\n                    break;\r\n                case '|=':\r\n                    value |= rightValue;\r\n                    break;\r\n                default:\r\n                    throw SyntaxError('Unknown assignment expression: ' + node['operator']);\r\n            }\r\n            var setter = this.setValue(state.leftReference_, value);\r\n            if (setter) {\r\n                state.doneSetter_ = value;\r\n                return this.createSetter_(setter, state.leftReference_, value);\r\n            }\r\n            // Return if no setter function.\r\n            stack.pop();\r\n            stack[stack.length - 1].value = value;\r\n        };\r\n        ;\r\n        Interpreter.prototype.stepBinaryExpression = function (stack, state, node) {\r\n            if (!state.doneLeft_) {\r\n                state.doneLeft_ = true;\r\n                return new Interpreter.MyState(node['left'], state.scope);\r\n            }\r\n            if (!state.doneRight_) {\r\n                state.doneRight_ = true;\r\n                state.leftValue_ = state.value;\r\n                return new Interpreter.MyState(node['right'], state.scope);\r\n            }\r\n            stack.pop();\r\n            var leftValue = state.leftValue_;\r\n            var rightValue = state.value;\r\n            var value;\r\n            switch (node['operator']) {\r\n                case '==':\r\n                    value = leftValue == rightValue;\r\n                    break;\r\n                case '!=':\r\n                    value = leftValue != rightValue;\r\n                    break;\r\n                case '===':\r\n                    value = leftValue === rightValue;\r\n                    break;\r\n                case '!==':\r\n                    value = leftValue !== rightValue;\r\n                    break;\r\n                case '>':\r\n                    value = leftValue > rightValue;\r\n                    break;\r\n                case '>=':\r\n                    value = leftValue >= rightValue;\r\n                    break;\r\n                case '<':\r\n                    value = leftValue < rightValue;\r\n                    break;\r\n                case '<=':\r\n                    value = leftValue <= rightValue;\r\n                    break;\r\n                case '+':\r\n                    value = leftValue + rightValue;\r\n                    break;\r\n                case '-':\r\n                    value = leftValue - rightValue;\r\n                    break;\r\n                case '*':\r\n                    value = leftValue * rightValue;\r\n                    break;\r\n                case '/':\r\n                    value = leftValue / rightValue;\r\n                    break;\r\n                case '%':\r\n                    value = leftValue % rightValue;\r\n                    break;\r\n                case '&':\r\n                    value = leftValue & rightValue;\r\n                    break;\r\n                case '|':\r\n                    value = leftValue | rightValue;\r\n                    break;\r\n                case '^':\r\n                    value = leftValue ^ rightValue;\r\n                    break;\r\n                case '<<':\r\n                    value = leftValue << rightValue;\r\n                    break;\r\n                case '>>':\r\n                    value = leftValue >> rightValue;\r\n                    break;\r\n                case '>>>':\r\n                    value = leftValue >>> rightValue;\r\n                    break;\r\n                case 'in':\r\n                    if (!rightValue || !rightValue.isObject) {\r\n                        this.throwException(this.TYPE_ERROR, \"'in' expects an object, not '\" + rightValue + \"'\");\r\n                    }\r\n                    value = this.hasProperty(rightValue, leftValue);\r\n                    break;\r\n                case 'instanceof':\r\n                    if (!this.isa(rightValue, this.FUNCTION)) {\r\n                        this.throwException(this.TYPE_ERROR, 'Right-hand side of instanceof is not an object');\r\n                    }\r\n                    value = leftValue.isObject ? this.isa(leftValue, rightValue) : false;\r\n                    break;\r\n                default:\r\n                    throw SyntaxError('Unknown binary operator: ' + node['operator']);\r\n            }\r\n            stack[stack.length - 1].value = value;\r\n        };\r\n        ;\r\n        Interpreter.prototype.stepBlockStatement = function (stack, state, node) {\r\n            var n = state.n_ || 0;\r\n            var expression = node['body'][n];\r\n            if (expression) {\r\n                state.n_ = n + 1;\r\n                return new Interpreter.MyState(expression, state.scope);\r\n            }\r\n            stack.pop();\r\n        };\r\n        ;\r\n        Interpreter.prototype.stepBreakStatement = function (stack, state, node) {\r\n            stack.pop();\r\n            var label = null;\r\n            if (node['label']) {\r\n                label = node['label']['name'];\r\n            }\r\n            while (state &&\r\n                state.node['type'] !== 'CallExpression' &&\r\n                state.node['type'] !== 'NewExpression') {\r\n                if (label) {\r\n                    if (state.labels && state.labels.indexOf(label) !== -1) {\r\n                        return;\r\n                    }\r\n                }\r\n                else if (state.isLoop || state.isSwitch) {\r\n                    return;\r\n                }\r\n                state = stack.pop();\r\n            }\r\n            // Syntax error, do not allow this error to be trapped.\r\n            throw SyntaxError('Illegal break statement');\r\n        };\r\n        ;\r\n        Interpreter.prototype.stepCallExpression = function (stack, state, node) {\r\n            if (!state.doneCallee_) {\r\n                state.doneCallee_ = 1;\r\n                // Components needed to determine value of 'this'.\r\n                var nextState = new Interpreter.MyState(node['callee'], state.scope);\r\n                nextState.components = true;\r\n                return nextState;\r\n            }\r\n            if (state.doneCallee_ === 1) {\r\n                // Determine value of the function.\r\n                state.doneCallee_ = 2;\r\n                var func = state.value;\r\n                if (Array.isArray(func)) {\r\n                    state.func_ = this.getValue(func);\r\n                    if (func[0] !== Interpreter.SCOPE_REFERENCE) {\r\n                        // Method function, 'this' is object (ignored if invoked as 'new').\r\n                        state.funcThis_ = func[0];\r\n                    }\r\n                    func = state.func_;\r\n                    if (func && typeof func === 'object' && func.isGetter) {\r\n                        // Clear the getter flag and call the getter function.\r\n                        func.isGetter = false;\r\n                        state.doneCallee_ = 1;\r\n                        return this.createGetter_(/** @type {!Interpreter.Object} */ (func), state.value);\r\n                    }\r\n                }\r\n                else {\r\n                    // Already evaluated function: (function(){...})();\r\n                    state.func_ = func;\r\n                }\r\n                state.arguments_ = [];\r\n                state.n_ = 0;\r\n            }\r\n            var func = state.func_;\r\n            if (!state.doneArgs_) {\r\n                if (state.n_ !== 0) {\r\n                    state.arguments_.push(state.value);\r\n                }\r\n                if (node['arguments'][state.n_]) {\r\n                    return new Interpreter.MyState(node['arguments'][state.n_++], state.scope);\r\n                }\r\n                // Determine value of 'this' in function.\r\n                if (node['type'] === 'NewExpression') {\r\n                    if (func.illegalConstructor) {\r\n                        // Illegal: new escape();\r\n                        this.throwException(this.TYPE_ERROR, func + ' is not a constructor');\r\n                    }\r\n                    // Constructor, 'this' is new object.\r\n                    state.funcThis_ = this.createObject(func);\r\n                    state.isConstructor = true;\r\n                }\r\n                else if (state.funcThis_ === undefined) {\r\n                    // Global function, 'this' is global object (or 'undefined' if strict).\r\n                    state.funcThis_ = state.scope.strict ? undefined : this.global;\r\n                }\r\n                state.doneArgs_ = true;\r\n            }\r\n            if (!state.doneExec_) {\r\n                state.doneExec_ = true;\r\n                if (!func || !func.isObject) {\r\n                    this.throwException(this.TYPE_ERROR, func + ' is not a function');\r\n                }\r\n                var funcNode = func.node;\r\n                if (funcNode) {\r\n                    var scope = this.createScope(funcNode['body'], func.parentScope);\r\n                    // Add all arguments.\r\n                    for (var i = 0; i < funcNode['params'].length; i++) {\r\n                        var paramName = funcNode['params'][i]['name'];\r\n                        var paramValue = state.arguments_.length > i ? state.arguments_[i] :\r\n                            undefined;\r\n                        this.setProperty(scope, paramName, paramValue);\r\n                    }\r\n                    // Build arguments variable.\r\n                    var argsList = this.createObjectProto(this.ARRAY_PROTO);\r\n                    for (var i = 0; i < state.arguments_.length; i++) {\r\n                        this.setProperty(argsList, i, state.arguments_[i]);\r\n                    }\r\n                    this.setProperty(scope, 'arguments', argsList);\r\n                    // Add the function's name (var x = function foo(){};)\r\n                    var name = funcNode['id'] && funcNode['id']['name'];\r\n                    if (name) {\r\n                        this.setProperty(scope, name, func);\r\n                    }\r\n                    this.setProperty(scope, 'this', state.funcThis_, Interpreter.READONLY_DESCRIPTOR);\r\n                    state.value = undefined; // Default value if no explicit return.\r\n                    return new Interpreter.MyState(funcNode['body'], scope);\r\n                }\r\n                else if (func.eval) {\r\n                    var code = state.arguments_[0];\r\n                    if (typeof code !== 'string') {\r\n                        // JS does not parse String objects:\r\n                        // eval(new String('1 + 1')) -> '1 + 1'\r\n                        state.value = code;\r\n                    }\r\n                    else {\r\n                        try {\r\n                            var ast = Interpreter.acorn.parse(code.toString(), Interpreter.PARSE_OPTIONS);\r\n                        }\r\n                        catch (e) {\r\n                            // Acorn threw a SyntaxError.  Rethrow as a trappable error.\r\n                            this.throwException(this.SYNTAX_ERROR, 'Invalid code: ' + e.message);\r\n                        }\r\n                        var evalNode = new this.nodeConstructor();\r\n                        evalNode['type'] = 'EvalProgram_';\r\n                        evalNode['body'] = ast['body'];\r\n                        this.stripLocations_(evalNode, node['start'], node['end']);\r\n                        // Update current scope with definitions in eval().\r\n                        var scope = state.scope;\r\n                        if (scope.strict) {\r\n                            // Strict mode get its own scope in eval.\r\n                            scope = this.createScope(ast, scope);\r\n                        }\r\n                        else {\r\n                            // Non-strict mode pollutes the current scope.\r\n                            this.populateScope_(ast, scope);\r\n                        }\r\n                        this.value = undefined; // Default value if no code.\r\n                        return new Interpreter.MyState(evalNode, scope);\r\n                    }\r\n                }\r\n                else if (func.nativeFunc) {\r\n                    state.value = func.nativeFunc.apply(state.funcThis_, state.arguments_);\r\n                }\r\n                else if (func.asyncFunc) {\r\n                    var thisInterpreter = this;\r\n                    var callback = function (value) {\r\n                        state.value = value;\r\n                        thisInterpreter.paused_ = false;\r\n                    };\r\n                    var argsWithCallback = state.arguments_.concat(callback);\r\n                    this.paused_ = true;\r\n                    func.asyncFunc.apply(state.funcThis_, argsWithCallback);\r\n                    return;\r\n                }\r\n                else {\r\n                    /* A child of a function is a function but is not callable.  For example:\r\n                    var F = function() {};\r\n                    F.prototype = escape;\r\n                    var f = new F();\r\n                    f();\r\n                    */\r\n                    this.throwException(this.TYPE_ERROR, func.class + ' is not a function');\r\n                }\r\n            }\r\n            else {\r\n                // Execution complete.  Put the return value on the stack.\r\n                stack.pop();\r\n                if (state.isConstructor && typeof state.value !== 'object') {\r\n                    stack[stack.length - 1].value = state.funcThis_;\r\n                }\r\n                else {\r\n                    stack[stack.length - 1].value = state.value;\r\n                }\r\n            }\r\n        };\r\n        ;\r\n        Interpreter.prototype.stepCatchClause = function (stack, state, node) {\r\n            if (!state.done_) {\r\n                state.done_ = true;\r\n                // Create an empty scope.\r\n                var scope = this.createSpecialScope(state.scope);\r\n                // Add the argument.\r\n                this.setProperty(scope, node['param']['name'], state.throwValue);\r\n                // Execute catch clause.\r\n                return new Interpreter.MyState(node['body'], scope);\r\n            }\r\n            else {\r\n                stack.pop();\r\n            }\r\n        };\r\n        ;\r\n        Interpreter.prototype.stepConditionalExpression = function (stack, state, node) {\r\n            var mode = state.mode_ || 0;\r\n            if (mode === 0) {\r\n                state.mode_ = 1;\r\n                return new Interpreter.MyState(node['test'], state.scope);\r\n            }\r\n            if (mode === 1) {\r\n                state.mode_ = 2;\r\n                var value = Boolean(state.value);\r\n                if (value && node['consequent']) {\r\n                    // Execute 'if' block.\r\n                    return new Interpreter.MyState(node['consequent'], state.scope);\r\n                }\r\n                else if (!value && node['alternate']) {\r\n                    // Execute 'else' block.\r\n                    return new Interpreter.MyState(node['alternate'], state.scope);\r\n                }\r\n                // eval('1;if(false){2}') -> undefined\r\n                this.value = undefined;\r\n            }\r\n            stack.pop();\r\n            if (node['type'] === 'ConditionalExpression') {\r\n                stack[stack.length - 1].value = state.value;\r\n            }\r\n        };\r\n        ;\r\n        Interpreter.prototype.stepContinueStatement = function (stack, state, node) {\r\n            stack.pop();\r\n            var label = null;\r\n            if (node['label']) {\r\n                label = node['label']['name'];\r\n            }\r\n            state = stack[stack.length - 1];\r\n            while (state &&\r\n                state.node['type'] !== 'CallExpression' &&\r\n                state.node['type'] !== 'NewExpression') {\r\n                if (state.isLoop) {\r\n                    if (!label || (state.labels && state.labels.indexOf(label) !== -1)) {\r\n                        return;\r\n                    }\r\n                }\r\n                stack.pop();\r\n                state = stack[stack.length - 1];\r\n            }\r\n            // Syntax error, do not allow this error to be trapped.\r\n            throw SyntaxError('Illegal continue statement');\r\n        };\r\n        ;\r\n        Interpreter.prototype.stepDebuggerStatement = function (stack, state, node) {\r\n            // Do nothing.  May be overridden by developers.\r\n            stack.pop();\r\n        };\r\n        ;\r\n        Interpreter.prototype.stepDoWhileStatement = function (stack, state, node) {\r\n            if (node['type'] === 'DoWhileStatement' && state.test_ === undefined) {\r\n                // First iteration of do/while executes without checking test.\r\n                state.value = true;\r\n                state.test_ = true;\r\n            }\r\n            if (!state.test_) {\r\n                state.test_ = true;\r\n                return new Interpreter.MyState(node['test'], state.scope);\r\n            }\r\n            if (!state.value) {\r\n                stack.pop();\r\n            }\r\n            else if (node['body']) {\r\n                state.test_ = false;\r\n                state.isLoop = true;\r\n                return new Interpreter.MyState(node['body'], state.scope);\r\n            }\r\n        };\r\n        ;\r\n        Interpreter.prototype.stepEmptyStatement = function (stack, state, node) {\r\n            stack.pop();\r\n        };\r\n        ;\r\n        Interpreter.prototype.stepEvalProgram_ = function (stack, state, node) {\r\n            var n = state.n_ || 0;\r\n            var expression = node['body'][n];\r\n            if (expression) {\r\n                state.n_ = n + 1;\r\n                return new Interpreter.MyState(expression, state.scope);\r\n            }\r\n            stack.pop();\r\n            stack[stack.length - 1].value = this.value;\r\n        };\r\n        ;\r\n        Interpreter.prototype.stepExpressionStatement = function (stack, state, node) {\r\n            if (!state.done_) {\r\n                state.done_ = true;\r\n                return new Interpreter.MyState(node['expression'], state.scope);\r\n            }\r\n            stack.pop();\r\n            // Save this value to interpreter.value for use as a return value if\r\n            // this code is inside an eval function.\r\n            this.value = state.value;\r\n        };\r\n        ;\r\n        Interpreter.prototype.stepForInStatement = function (stack, state, node) {\r\n            // First, initialize a variable if exists.  Only do so once, ever.\r\n            if (!state.doneInit_) {\r\n                state.doneInit_ = true;\r\n                if (node['left']['declarations'] &&\r\n                    node['left']['declarations'][0]['init']) {\r\n                    if (state.scope.strict) {\r\n                        this.throwException(this.SYNTAX_ERROR, 'for-in loop variable declaration may not have an initializer.');\r\n                    }\r\n                    // Variable initialization: for (var x = 4 in y)\r\n                    return new Interpreter.MyState(node['left'], state.scope);\r\n                }\r\n            }\r\n            // Second, look up the object.  Only do so once, ever.\r\n            if (!state.doneObject_) {\r\n                state.doneObject_ = true;\r\n                if (!state.variable_) {\r\n                    state.variable_ = state.value;\r\n                }\r\n                return new Interpreter.MyState(node['right'], state.scope);\r\n            }\r\n            if (!state.isLoop) {\r\n                // First iteration.\r\n                state.isLoop = true;\r\n                state.object_ = state.value;\r\n                state.visited_ = Object.create(null);\r\n            }\r\n            // Third, find the property name for this iteration.\r\n            if (state.name_ === undefined) {\r\n                done: do {\r\n                    if (state.object_ && state.object_.isObject) {\r\n                        if (!state.props_) {\r\n                            state.props_ = Object.getOwnPropertyNames(state.object_.properties);\r\n                        }\r\n                        do {\r\n                            var prop = state.props_.shift();\r\n                        } while (prop && (state.visited_[prop] ||\r\n                            !Object.prototype.hasOwnProperty.call(state.object_.properties, prop)));\r\n                        if (prop) {\r\n                            state.visited_[prop] = true;\r\n                            if (Object.prototype.propertyIsEnumerable.call(state.object_.properties, prop)) {\r\n                                state.name_ = prop;\r\n                                break done;\r\n                            }\r\n                        }\r\n                    }\r\n                    else if (state.object_ !== null) {\r\n                        if (!state.props_) {\r\n                            state.props_ = Object.getOwnPropertyNames(state.object_);\r\n                        }\r\n                        do {\r\n                            var prop = state.props_.shift();\r\n                        } while (prop && state.visited_[prop]);\r\n                        if (prop) {\r\n                            state.visited_[prop] = true;\r\n                            state.name_ = prop;\r\n                            break done;\r\n                        }\r\n                    }\r\n                    state.object_ = this.getPrototype(state.object_);\r\n                    state.props_ = null;\r\n                } while (state.object_ !== null);\r\n                if (state.object_ === null) {\r\n                    // Done, exit loop.\r\n                    stack.pop();\r\n                    return;\r\n                }\r\n            }\r\n            // Fourth, find the variable\r\n            if (!state.doneVariable_) {\r\n                state.doneVariable_ = true;\r\n                var left = node['left'];\r\n                if (left['type'] === 'VariableDeclaration') {\r\n                    // Inline variable declaration: for (var x in y)\r\n                    state.variable_ =\r\n                        [Interpreter.SCOPE_REFERENCE, left['declarations'][0]['id']['name']];\r\n                }\r\n                else {\r\n                    // Arbitrary left side: for (foo().bar in y)\r\n                    state.variable_ = null;\r\n                    var nextState = new Interpreter.MyState(left, state.scope);\r\n                    nextState.components = true;\r\n                    return nextState;\r\n                }\r\n            }\r\n            if (!state.variable_) {\r\n                state.variable_ = state.value;\r\n            }\r\n            // Fifth, set the variable.\r\n            if (!state.doneSetter_) {\r\n                state.doneSetter_ = true;\r\n                var value = state.name_;\r\n                var setter = this.setValue(state.variable_, value);\r\n                if (setter) {\r\n                    return this.createSetter_(setter, state.variable_, value);\r\n                }\r\n            }\r\n            // Next step will be step three.\r\n            state.name_ = undefined;\r\n            // Reevaluate the variable since it could be a setter on the global object.\r\n            state.doneVariable_ = false;\r\n            state.doneSetter_ = false;\r\n            // Sixth and finally, execute the body if there was one.  this.\r\n            if (node['body']) {\r\n                return new Interpreter.MyState(node['body'], state.scope);\r\n            }\r\n        };\r\n        ;\r\n        Interpreter.prototype.stepForStatement = function (stack, state, node) {\r\n            var mode = state.mode_ || 0;\r\n            if (mode === 0) {\r\n                state.mode_ = 1;\r\n                if (node['init']) {\r\n                    return new Interpreter.MyState(node['init'], state.scope);\r\n                }\r\n            }\r\n            else if (mode === 1) {\r\n                state.mode_ = 2;\r\n                if (node['test']) {\r\n                    return new Interpreter.MyState(node['test'], state.scope);\r\n                }\r\n            }\r\n            else if (mode === 2) {\r\n                state.mode_ = 3;\r\n                if (node['test'] && !state.value) {\r\n                    // Done, exit loop.\r\n                    stack.pop();\r\n                }\r\n                else {\r\n                    state.isLoop = true;\r\n                    return new Interpreter.MyState(node['body'], state.scope);\r\n                }\r\n            }\r\n            else if (mode === 3) {\r\n                state.mode_ = 1;\r\n                if (node['update']) {\r\n                    return new Interpreter.MyState(node['update'], state.scope);\r\n                }\r\n            }\r\n        };\r\n        ;\r\n        Interpreter.prototype.stepFunctionDeclaration = function (stack, state, node) {\r\n            // This was found and handled when the scope was populated.\r\n            stack.pop();\r\n        };\r\n        ;\r\n        Interpreter.prototype.stepFunctionExpression = function (stack, state, node) {\r\n            stack.pop();\r\n            stack[stack.length - 1].value = this.createFunction(node, state.scope);\r\n        };\r\n        ;\r\n        Interpreter.prototype.stepIdentifier = function (stack, state, node) {\r\n            stack.pop();\r\n            if (state.components) {\r\n                stack[stack.length - 1].value = [Interpreter.SCOPE_REFERENCE, node['name']];\r\n                return;\r\n            }\r\n            var value = this.getValueFromScope(node['name']);\r\n            // An identifier could be a getter if it's a property on the global object.\r\n            if (value && typeof value === 'object' && value.isGetter) {\r\n                // Clear the getter flag and call the getter function.\r\n                value.isGetter = false;\r\n                var scope = state.scope;\r\n                while (!this.hasProperty(scope, node['name'])) {\r\n                    scope = scope.parentScope;\r\n                }\r\n                var func = (value);\r\n                return this.createGetter_(func, this.global);\r\n            }\r\n            stack[stack.length - 1].value = value;\r\n        };\r\n        ;\r\n        Interpreter.prototype.stepIfStatement = function (stack, state, node) {\r\n            return this.stepConditionalExpression(stack, state, node);\r\n        };\r\n        Interpreter.prototype.stepLabeledStatement = function (stack, state, node) {\r\n            // No need to hit this node again on the way back up the stack.\r\n            stack.pop();\r\n            // Note that a statement might have multiple labels.\r\n            var labels = state.labels || [];\r\n            labels.push(node['label']['name']);\r\n            var nextState = new Interpreter.MyState(node['body'], state.scope);\r\n            nextState.labels = labels;\r\n            return nextState;\r\n        };\r\n        ;\r\n        Interpreter.prototype.stepLiteral = function (stack, state, node) {\r\n            stack.pop();\r\n            var value = node['value'];\r\n            if (value instanceof RegExp) {\r\n                var pseudoRegexp = this.createObjectProto(this.REGEXP_PROTO);\r\n                this.populateRegExp(pseudoRegexp, value);\r\n                value = pseudoRegexp;\r\n            }\r\n            stack[stack.length - 1].value = value;\r\n        };\r\n        ;\r\n        Interpreter.prototype.stepLogicalExpression = function (stack, state, node) {\r\n            if (node['operator'] !== '&&' && node['operator'] !== '||') {\r\n                throw SyntaxError('Unknown logical operator: ' + node['operator']);\r\n            }\r\n            if (!state.doneLeft_) {\r\n                state.doneLeft_ = true;\r\n                return new Interpreter.MyState(node['left'], state.scope);\r\n            }\r\n            if (!state.doneRight_) {\r\n                if ((node['operator'] === '&&' && !state.value) ||\r\n                    (node['operator'] === '||' && state.value)) {\r\n                    // Shortcut evaluation.\r\n                    stack.pop();\r\n                    stack[stack.length - 1].value = state.value;\r\n                }\r\n                else {\r\n                    state.doneRight_ = true;\r\n                    return new Interpreter.MyState(node['right'], state.scope);\r\n                }\r\n            }\r\n            else {\r\n                stack.pop();\r\n                stack[stack.length - 1].value = state.value;\r\n            }\r\n        };\r\n        ;\r\n        Interpreter.prototype.stepMemberExpression = function (stack, state, node) {\r\n            if (!state.doneObject_) {\r\n                state.doneObject_ = true;\r\n                return new Interpreter.MyState(node['object'], state.scope);\r\n            }\r\n            var propName;\r\n            if (!node['computed']) {\r\n                state.object_ = state.value;\r\n                // obj.foo -- Just access 'foo' directly.\r\n                propName = node['property']['name'];\r\n            }\r\n            else if (!state.doneProperty_) {\r\n                state.object_ = state.value;\r\n                // obj[foo] -- Compute value of 'foo'.\r\n                state.doneProperty_ = true;\r\n                return new Interpreter.MyState(node['property'], state.scope);\r\n            }\r\n            else {\r\n                propName = state.value;\r\n            }\r\n            stack.pop();\r\n            if (state.components) {\r\n                stack[stack.length - 1].value = [state.object_, propName];\r\n            }\r\n            else {\r\n                var value = this.getProperty(state.object_, propName);\r\n                if (value && typeof value === 'object' && value.isGetter) {\r\n                    // Clear the getter flag and call the getter function.\r\n                    value.isGetter = false;\r\n                    var func = (value);\r\n                    return this.createGetter_(func, state.object_);\r\n                }\r\n                stack[stack.length - 1].value = value;\r\n            }\r\n        };\r\n        ;\r\n        Interpreter.prototype.stepNewExpression = function (stack, state, node) {\r\n            return this.stepCallExpression(stack, state, node);\r\n        };\r\n        Interpreter.prototype.stepObjectExpression = function (stack, state, node) {\r\n            var n = state.n_ || 0;\r\n            var property = node['properties'][n];\r\n            if (!state.object_) {\r\n                // First execution.\r\n                state.object_ = this.createObjectProto(this.OBJECT_PROTO);\r\n                state.properties_ = Object.create(null);\r\n            }\r\n            else {\r\n                // Determine property name.\r\n                var key = property['key'];\r\n                if (key['type'] === 'Identifier') {\r\n                    var propName = key['name'];\r\n                }\r\n                else if (key['type'] === 'Literal') {\r\n                    var propName = key['value'];\r\n                }\r\n                else {\r\n                    throw SyntaxError('Unknown object structure: ' + key['type']);\r\n                }\r\n                // Set the property computed in the previous execution.\r\n                if (!state.properties_[propName]) {\r\n                    // Create temp object to collect value, getter, and/or setter.\r\n                    state.properties_[propName] = {};\r\n                }\r\n                state.properties_[propName][property['kind']] = state.value;\r\n                state.n_ = ++n;\r\n                property = node['properties'][n];\r\n            }\r\n            if (property) {\r\n                return new Interpreter.MyState(property['value'], state.scope);\r\n            }\r\n            for (var key in state.properties_) {\r\n                var kinds = state.properties_[key];\r\n                if ('get' in kinds || 'set' in kinds) {\r\n                    // Set a property with a getter or setter.\r\n                    var descriptor = {\r\n                        configurable: true,\r\n                        enumerable: true,\r\n                        get: kinds['get'],\r\n                        set: kinds['set']\r\n                    };\r\n                    this.setProperty(state.object_, key, null, descriptor);\r\n                }\r\n                else {\r\n                    // Set a normal property with a value.\r\n                    this.setProperty(state.object_, key, kinds['init']);\r\n                }\r\n            }\r\n            stack.pop();\r\n            stack[stack.length - 1].value = state.object_;\r\n        };\r\n        ;\r\n        Interpreter.prototype.stepProgram = function (stack, state, node) {\r\n            var n = state.n_ || 0;\r\n            var expression = node['body'][n];\r\n            if (expression) {\r\n                state.done = false;\r\n                state.n_ = n + 1;\r\n                return new Interpreter.MyState(expression, state.scope);\r\n            }\r\n            state.done = true;\r\n            // Don't pop the stateStack.\r\n            // Leave the root scope on the tree in case the program is appended to.\r\n        };\r\n        ;\r\n        Interpreter.prototype.stepReturnStatement = function (stack, state, node) {\r\n            if (node['argument'] && !state.done_) {\r\n                state.done_ = true;\r\n                return new Interpreter.MyState(node['argument'], state.scope);\r\n            }\r\n            var value = state.value;\r\n            var i = stack.length - 1;\r\n            state = stack[i];\r\n            while (state.node['type'] !== 'CallExpression' &&\r\n                state.node['type'] !== 'NewExpression') {\r\n                if (state.node['type'] !== 'TryStatement') {\r\n                    stack.splice(i, 1);\r\n                }\r\n                i--;\r\n                if (i < 0) {\r\n                    // Syntax error, do not allow this error to be trapped.\r\n                    throw SyntaxError('Illegal return statement');\r\n                }\r\n                state = stack[i];\r\n            }\r\n            state.value = value;\r\n        };\r\n        ;\r\n        Interpreter.prototype.stepSequenceExpression = function (stack, state, node) {\r\n            var n = state.n_ || 0;\r\n            var expression = node['expressions'][n];\r\n            if (expression) {\r\n                state.n_ = n + 1;\r\n                return new Interpreter.MyState(expression, state.scope);\r\n            }\r\n            stack.pop();\r\n            stack[stack.length - 1].value = state.value;\r\n        };\r\n        ;\r\n        Interpreter.prototype.stepSwitchStatement = function (stack, state, node) {\r\n            if (!state.test_) {\r\n                state.test_ = 1;\r\n                return new Interpreter.MyState(node['discriminant'], state.scope);\r\n            }\r\n            if (state.test_ === 1) {\r\n                state.test_ = 2;\r\n                // Preserve switch value between case tests.\r\n                state.switchValue_ = state.value;\r\n            }\r\n            while (true) {\r\n                var index = state.index_ || 0;\r\n                var switchCase = node['cases'][index];\r\n                if (!state.matched_ && switchCase && !switchCase['test']) {\r\n                    // Test on the default case is null.\r\n                    // Bypass (but store) the default case, and get back to it later.\r\n                    state.defaultCase_ = index;\r\n                    state.index_ = index + 1;\r\n                    continue;\r\n                }\r\n                if (!switchCase && !state.matched_ && state.defaultCase_) {\r\n                    // Ran through all cases, no match.  Jump to the default.\r\n                    state.matched_ = true;\r\n                    state.index_ = state.defaultCase_;\r\n                    continue;\r\n                }\r\n                if (switchCase) {\r\n                    if (!state.matched_ && !state.tested_ && switchCase['test']) {\r\n                        state.tested_ = true;\r\n                        return new Interpreter.MyState(switchCase['test'], state.scope);\r\n                    }\r\n                    if (state.matched_ || state.value === state.switchValue_) {\r\n                        state.matched_ = true;\r\n                        var n = state.n_ || 0;\r\n                        if (switchCase['consequent'][n]) {\r\n                            state.isSwitch = true;\r\n                            state.n_ = n + 1;\r\n                            return new Interpreter.MyState(switchCase['consequent'][n], state.scope);\r\n                        }\r\n                    }\r\n                    // Move on to next case.\r\n                    state.tested_ = false;\r\n                    state.n_ = 0;\r\n                    state.index_ = index + 1;\r\n                }\r\n                else {\r\n                    stack.pop();\r\n                    return;\r\n                }\r\n            }\r\n        };\r\n        ;\r\n        Interpreter.prototype.stepThisExpression = function (stack, state, node) {\r\n            stack.pop();\r\n            stack[stack.length - 1].value = this.getValueFromScope('this');\r\n        };\r\n        ;\r\n        Interpreter.prototype.stepThrowStatement = function (stack, state, node) {\r\n            if (!state.done_) {\r\n                state.done_ = true;\r\n                return new Interpreter.MyState(node['argument'], state.scope);\r\n            }\r\n            else {\r\n                this.throwException(state.value);\r\n            }\r\n        };\r\n        ;\r\n        Interpreter.prototype.stepTryStatement = function (stack, state, node) {\r\n            if (!state.doneBlock_) {\r\n                state.doneBlock_ = true;\r\n                return new Interpreter.MyState(node['block'], state.scope);\r\n            }\r\n            if (state.throwValue && !state.doneHandler_ && node['handler']) {\r\n                state.doneHandler_ = true;\r\n                var nextState = new Interpreter.MyState(node['handler'], state.scope);\r\n                nextState.throwValue = state.throwValue;\r\n                state.throwValue = null; // This error has been handled, don't rethrow.\r\n                return nextState;\r\n            }\r\n            if (!state.doneFinalizer_ && node['finalizer']) {\r\n                state.doneFinalizer_ = true;\r\n                return new Interpreter.MyState(node['finalizer'], state.scope);\r\n            }\r\n            if (state.throwValue) {\r\n                // There was no catch handler, or the catch/finally threw an error.\r\n                // Throw the error up to a higher try.\r\n                this.executeException(state.throwValue);\r\n            }\r\n            else {\r\n                stack.pop();\r\n            }\r\n        };\r\n        ;\r\n        Interpreter.prototype.stepUnaryExpression = function (stack, state, node) {\r\n            if (!state.done_) {\r\n                state.done_ = true;\r\n                var nextState = new Interpreter.MyState(node['argument'], state.scope);\r\n                nextState.components = node['operator'] === 'delete';\r\n                return nextState;\r\n            }\r\n            stack.pop();\r\n            var value = state.value;\r\n            if (node['operator'] === '-') {\r\n                value = -value;\r\n            }\r\n            else if (node['operator'] === '+') {\r\n                value = +value;\r\n            }\r\n            else if (node['operator'] === '!') {\r\n                value = !value;\r\n            }\r\n            else if (node['operator'] === '~') {\r\n                value = ~value;\r\n            }\r\n            else if (node['operator'] === 'delete') {\r\n                var result = true;\r\n                // If value is not an array, then it is a primitive, or some other value.\r\n                // If so, skip the delete and return true.\r\n                if (Array.isArray(value)) {\r\n                    var obj = value[0];\r\n                    if (obj === Interpreter.SCOPE_REFERENCE) {\r\n                        // 'delete foo;' is the same as 'delete window.foo'.\r\n                        obj = state.scope;\r\n                    }\r\n                    var name = String(value[1]);\r\n                    try {\r\n                        delete obj.properties[name];\r\n                    }\r\n                    catch (e) {\r\n                        if (state.scope.strict) {\r\n                            this.throwException(this.TYPE_ERROR, \"Cannot delete property '\" +\r\n                                name + \"' of '\" + obj + \"'\");\r\n                        }\r\n                        else {\r\n                            result = false;\r\n                        }\r\n                    }\r\n                }\r\n                value = result;\r\n            }\r\n            else if (node['operator'] === 'typeof') {\r\n                value = (value && value.class === 'Function') ? 'function' : typeof value;\r\n            }\r\n            else if (node['operator'] === 'void') {\r\n                value = undefined;\r\n            }\r\n            else {\r\n                throw SyntaxError('Unknown unary operator: ' + node['operator']);\r\n            }\r\n            stack[stack.length - 1].value = value;\r\n        };\r\n        ;\r\n        Interpreter.prototype.stepUpdateExpression = function (stack, state, node) {\r\n            if (!state.doneLeft_) {\r\n                state.doneLeft_ = true;\r\n                var nextState = new Interpreter.MyState(node['argument'], state.scope);\r\n                nextState.components = true;\r\n                return nextState;\r\n            }\r\n            if (!state.leftSide_) {\r\n                state.leftSide_ = state.value;\r\n            }\r\n            if (state.doneGetter_) {\r\n                state.leftValue_ = state.value;\r\n            }\r\n            if (!state.doneGetter_) {\r\n                var leftValue = this.getValue(state.leftSide_);\r\n                state.leftValue_ = leftValue;\r\n                if (leftValue && typeof leftValue === 'object' && leftValue.isGetter) {\r\n                    // Clear the getter flag and call the getter function.\r\n                    leftValue.isGetter = false;\r\n                    state.doneGetter_ = true;\r\n                    var func = (leftValue);\r\n                    return this.createGetter_(func, state.leftSide_);\r\n                }\r\n            }\r\n            if (state.doneSetter_) {\r\n                // Return if setter function.\r\n                // Setter method on property has completed.\r\n                // Ignore its return value, and use the original set value instead.\r\n                stack.pop();\r\n                stack[stack.length - 1].value = state.doneSetter_;\r\n                return;\r\n            }\r\n            leftValue = Number(state.leftValue_);\r\n            var changeValue;\r\n            if (node['operator'] === '++') {\r\n                changeValue = leftValue + 1;\r\n            }\r\n            else if (node['operator'] === '--') {\r\n                changeValue = leftValue - 1;\r\n            }\r\n            else {\r\n                throw SyntaxError('Unknown update expression: ' + node['operator']);\r\n            }\r\n            var returnValue = node['prefix'] ? changeValue : leftValue;\r\n            var setter = this.setValue(state.leftSide_, changeValue);\r\n            if (setter) {\r\n                state.doneSetter_ = returnValue;\r\n                return this.createSetter_(setter, state.leftSide_, changeValue);\r\n            }\r\n            // Return if no setter function.\r\n            stack.pop();\r\n            stack[stack.length - 1].value = returnValue;\r\n        };\r\n        ;\r\n        Interpreter.prototype.stepVariableDeclaration = function (stack, state, node) {\r\n            var declarations = node['declarations'];\r\n            var n = state.n_ || 0;\r\n            var declarationNode = declarations[n];\r\n            if (state.init_ && declarationNode) {\r\n                // This setValue call never needs to deal with calling a setter function.\r\n                // Note that this is setting the init value, not defining the variable.\r\n                // Variable definition is done when scope is populated.\r\n                this.setValueToScope(declarationNode['id']['name'], state.value);\r\n                state.init_ = false;\r\n                declarationNode = declarations[++n];\r\n            }\r\n            while (declarationNode) {\r\n                // Skip any declarations that are not initialized.  They have already\r\n                // been defined as undefined in populateScope_.\r\n                if (declarationNode['init']) {\r\n                    state.n_ = n;\r\n                    state.init_ = true;\r\n                    return new Interpreter.MyState(declarationNode['init'], state.scope);\r\n                }\r\n                declarationNode = declarations[++n];\r\n            }\r\n            stack.pop();\r\n        };\r\n        ;\r\n        Interpreter.prototype.stepWithStatement = function (stack, state, node) {\r\n            if (!state.doneObject_) {\r\n                state.doneObject_ = true;\r\n                return new Interpreter.MyState(node['object'], state.scope);\r\n            }\r\n            else if (!state.doneBody_) {\r\n                state.doneBody_ = true;\r\n                var scope = this.createSpecialScope(state.scope, state.value);\r\n                return new Interpreter.MyState(node['body'], scope);\r\n            }\r\n            else {\r\n                stack.pop();\r\n            }\r\n        };\r\n        ;\r\n        Interpreter.prototype.stepWhileStatement = function (stack, state, node) {\r\n            return this.stepDoWhileStatement(stack, state, node);\r\n        };\r\n        /**\r\n         * @const {!Object} Configuration used for all Acorn parsing.\r\n         */\r\n        Interpreter.PARSE_OPTIONS = {\r\n            ecmaVersion: 5\r\n        };\r\n        /**\r\n         * Property descriptor of readonly properties.\r\n         */\r\n        Interpreter.READONLY_DESCRIPTOR = {\r\n            configurable: true,\r\n            enumerable: true,\r\n            writable: false\r\n        };\r\n        /**\r\n         * Property descriptor of non-enumerable properties.\r\n         */\r\n        Interpreter.NONENUMERABLE_DESCRIPTOR = {\r\n            configurable: true,\r\n            enumerable: false,\r\n            writable: true\r\n        };\r\n        /**\r\n         * Property descriptor of readonly, non-enumerable properties.\r\n         */\r\n        Interpreter.READONLY_NONENUMERABLE_DESCRIPTOR = {\r\n            configurable: true,\r\n            enumerable: false,\r\n            writable: false\r\n        };\r\n        /**\r\n         * Property descriptor of variables.\r\n         */\r\n        Interpreter.VARIABLE_DESCRIPTOR = {\r\n            configurable: false,\r\n            enumerable: true,\r\n            writable: true\r\n        };\r\n        /**\r\n         * Unique symbol for indicating that a step has encountered an error, has\r\n         * added it to the stack, and will be thrown within the user's program.\r\n         * When STEP_ERROR is thrown in the JS-Interpreter, the error can be ignored.\r\n         */\r\n        Interpreter.STEP_ERROR = {};\r\n        /**\r\n         * Unique symbol for indicating that a reference is a variable on the scope,\r\n         * not an object property.\r\n         */\r\n        Interpreter.SCOPE_REFERENCE = {};\r\n        /**\r\n         * For cycle detection in array to string and error conversion;\r\n         * see spec bug github.com/tc39/ecma262/issues/289\r\n         * Since this is for atomic actions only, it can be a class property.\r\n         */\r\n        Interpreter.toStringCycles_ = [];\r\n        return Interpreter;\r\n    }());\r\n    (function (Interpreter) {\r\n        /**\r\n         * Class for an object.\r\n         * @param {Interpreter.MyObject} proto Prototype object or null.\r\n         * @constructor\r\n         */\r\n        var MyObject = (function () {\r\n            function MyObject(proto) {\r\n                /** @type {Interpreter.MyObject} */\r\n                this.proto = null;\r\n                /** @type {boolean} */\r\n                this.isObject = true;\r\n                /** @type {string} */\r\n                this.class = 'Object';\r\n                /** @type {Date|RegExp|boolean|number|string|undefined|null} */\r\n                this.data = null;\r\n                this.getter = Object.create(null);\r\n                this.setter = Object.create(null);\r\n                this.properties = Object.create(null);\r\n                this.proto = proto;\r\n            }\r\n            /**\r\n             * Convert this object into a string.\r\n             * @return {string} String value.\r\n             * @override\r\n             */\r\n            MyObject.prototype.toString = function () {\r\n                if (this.class === 'Array') {\r\n                    // Array\r\n                    var cycles = Interpreter.toStringCycles_;\r\n                    cycles.push(this);\r\n                    try {\r\n                        var strs = [];\r\n                        for (var i = 0; i < this.properties.length; i++) {\r\n                            var value = this.properties[i];\r\n                            strs[i] = (value && value.isObject && cycles.indexOf(value) !== -1) ?\r\n                                '...' : value;\r\n                        }\r\n                    }\r\n                    finally {\r\n                        cycles.pop();\r\n                    }\r\n                    return strs.join(',');\r\n                }\r\n                if (this.class === 'Error') {\r\n                    var cycles = Interpreter.toStringCycles_;\r\n                    if (cycles.indexOf(this) !== -1) {\r\n                        return '[object Error]';\r\n                    }\r\n                    var name, message;\r\n                    // Bug: Does not support getters and setters for name or message.\r\n                    var obj = this;\r\n                    do {\r\n                        if ('name' in obj.properties) {\r\n                            name = obj.properties['name'];\r\n                            break;\r\n                        }\r\n                    } while ((obj = obj.proto));\r\n                    var obj = this;\r\n                    do {\r\n                        if ('message' in obj.properties) {\r\n                            message = obj.properties['message'];\r\n                            break;\r\n                        }\r\n                    } while ((obj = obj.proto));\r\n                    cycles.push(this);\r\n                    try {\r\n                        name = name && name.toString();\r\n                        message = message && message.toString();\r\n                    }\r\n                    finally {\r\n                        cycles.pop();\r\n                    }\r\n                    return message ? name + ': ' + message : String(name);\r\n                }\r\n                // RegExp, Date, and boxed primitives.\r\n                if (this.data !== null) {\r\n                    return String(this.data);\r\n                }\r\n                return '[object ' + this.class + ']';\r\n            };\r\n            /**\r\n             * Return the object's value.\r\n             * @return {Interpreter.MyValue} Value.\r\n             * @override\r\n             */\r\n            MyObject.prototype.valueOf = function () {\r\n                if (this.data === undefined || this.data === null ||\r\n                    this.data instanceof RegExp) {\r\n                    return this; // An Object.\r\n                }\r\n                if (this.data instanceof Date) {\r\n                    return this.data.valueOf(); // Milliseconds.\r\n                }\r\n                return (this.data); // Boxed primitive.\r\n            };\r\n            return MyObject;\r\n        }());\r\n        Interpreter.MyObject = MyObject;\r\n        /**\r\n         * Class for a state.\r\n         * @param {!MyObject} node AST node for the state.\r\n         * @param {!Interpreter.MyObject} scope Scope object for the state.\r\n         * @constructor\r\n         */\r\n        var MyState = (function () {\r\n            function MyState(node, scope) {\r\n                this.node = node;\r\n                this.scope = scope;\r\n            }\r\n            return MyState;\r\n        }());\r\n        Interpreter.MyState = MyState;\r\n    })(Interpreter || (Interpreter = {}));\r\n    // These lines are added for API compatibility\r\n    Interpreter['Object'] = Interpreter.MyObject;\r\n    Interpreter['State'] = Interpreter.MyState;\r\n    // Look for globally-defined acorn\r\n    try {\r\n        Interpreter.acorn = (self || global)['acorn'];\r\n    }\r\n    catch (e) {\r\n        // do nothing if we fail\r\n    }\r\n    return Interpreter;\r\n}.apply(exports, __WEBPACK_AMD_DEFINE_ARRAY__),\n\t\t\t\t__WEBPACK_AMD_DEFINE_RESULT__ !== undefined && (module.exports = __WEBPACK_AMD_DEFINE_RESULT__));\r\n\n/* WEBPACK VAR INJECTION */}.call(exports, __webpack_require__(5)))\n\n/***/ }),\n/* 5 */\n/***/ (function(module, exports) {\n\nvar g;\r\n\r\n// This works in non-strict mode\r\ng = (function() {\r\n\treturn this;\r\n})();\r\n\r\ntry {\r\n\t// This works if eval is allowed (see CSP)\r\n\tg = g || Function(\"return this\")() || (1,eval)(\"this\");\r\n} catch(e) {\r\n\t// This works if the window reference is available\r\n\tif(typeof window === \"object\")\r\n\t\tg = window;\r\n}\r\n\r\n// g can still be undefined, but nothing to do about it...\r\n// We return undefined, instead of nothing here, so it's\r\n// easier to handle this case. if(!global) { ...}\r\n\r\nmodule.exports = g;\r\n\n\n/***/ })\n/******/ ]);\n\n\n// WEBPACK FOOTER //\n// dist/acorn_interpreter.js"," \t// The module cache\n \tvar installedModules = {};\n\n \t// The require function\n \tfunction __webpack_require__(moduleId) {\n\n \t\t// Check if module is in cache\n \t\tif(installedModules[moduleId]) {\n \t\t\treturn installedModules[moduleId].exports;\n \t\t}\n \t\t// Create a new module (and put it into the cache)\n \t\tvar module = installedModules[moduleId] = {\n \t\t\ti: moduleId,\n \t\t\tl: false,\n \t\t\texports: {}\n \t\t};\n\n \t\t// Execute the module function\n \t\tmodules[moduleId].call(module.exports, module, module.exports, __webpack_require__);\n\n \t\t// Flag the module as loaded\n \t\tmodule.l = true;\n\n \t\t// Return the exports of the module\n \t\treturn module.exports;\n \t}\n\n\n \t// expose the modules object (__webpack_modules__)\n \t__webpack_require__.m = modules;\n\n \t// expose the module cache\n \t__webpack_require__.c = installedModules;\n\n \t// define getter function for harmony exports\n \t__webpack_require__.d = function(exports, name, getter) {\n \t\tif(!__webpack_require__.o(exports, name)) {\n \t\t\tObject.defineProperty(exports, name, {\n \t\t\t\tconfigurable: false,\n \t\t\t\tenumerable: true,\n \t\t\t\tget: getter\n \t\t\t});\n \t\t}\n \t};\n\n \t// getDefaultExport function for compatibility with non-harmony modules\n \t__webpack_require__.n = function(module) {\n \t\tvar getter = module && module.__esModule ?\n \t\t\tfunction getDefault() { return module['default']; } :\n \t\t\tfunction getModuleExports() { return module; };\n \t\t__webpack_require__.d(getter, 'a', getter);\n \t\treturn getter;\n \t};\n\n \t// Object.prototype.hasOwnProperty.call\n \t__webpack_require__.o = function(object, property) { return Object.prototype.hasOwnProperty.call(object, property); };\n\n \t// __webpack_public_path__\n \t__webpack_require__.p = \"\";\n\n \t// Load entry module and return exports\n \treturn __webpack_require__(__webpack_require__.s = 0);\n\n\n\n// WEBPACK FOOTER //\n// webpack/bootstrap 8ee9dc209b294c66f8d6","import acorn = require('./acorn');\nimport Interpreter = require('./interpreter');\n\n/*!\n * @license\n * JavaScript Interpreter bundled with acorn v0.4.1\n *\n * Copyright 2013-2017 Google Inc. and Jun Kato\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\n/**\n * @fileoverview Interpreting JavaScript in JavaScript (concatenated with acorn)\n * @author fraser@google.com (Neil Fraser)\n * @author i@junkato.jp (Jun Kato)\n */\n\nInterpreter.acorn = acorn;\nexport = Interpreter;\n\n\n\n// WEBPACK FOOTER //\n// ./lib/acorn_interpreter.ts","// Acorn is a tiny, fast JavaScript parser written in JavaScript.\n//\n// Acorn was written by Marijn Haverbeke and released under an MIT\n// license. The Unicode regexps (for identifiers and whitespace) were\n// taken from [Esprima](http://esprima.org) by Ariya Hidayat.\n//\n// Git repositories for Acorn are available at\n//\n//     http://marijnhaverbeke.nl/git/acorn\n//     https://github.com/marijnh/acorn.git\n//\n// Please use the [github bug tracker][ghbt] to report issues.\n//\n// [ghbt]: https://github.com/marijnh/acorn/issues\n//\n// This file defines the main parser interface. The library also comes\n// with a [error-tolerant parser][dammit] and an\n// [abstract syntax tree walker][walk], defined in other files.\n//\n// [dammit]: acorn_loose.js\n// [walk]: util/walk.js\n\n(function(root, mod) {\n  if (typeof exports == \"object\" && typeof module == \"object\") return mod(exports); // CommonJS\n  if (typeof define == \"function\" && define.amd) return define([\"exports\"], mod); // AMD\n  mod(root.acorn || (root.acorn = {})); // Plain browser env\n})(this, function(exports) {\n  \"use strict\";\n\n  exports.version = \"0.4.1\";\n\n  // The main exported interface (under `self.acorn` when in the\n  // browser) is a `parse` function that takes a code string and\n  // returns an abstract syntax tree as specified by [Mozilla parser\n  // API][api], with the caveat that the SpiderMonkey-specific syntax\n  // (`let`, `yield`, inline XML, etc) is not recognized.\n  //\n  // [api]: https://developer.mozilla.org/en-US/docs/SpiderMonkey/Parser_API\n\n  var options, input, inputLen, sourceFile;\n\n  exports.parse = function(inpt, opts) {\n    input = String(inpt); inputLen = input.length;\n    setOptions(opts);\n    initTokenState();\n    return parseTopLevel(options.program);\n  };\n\n  // A second optional argument can be given to further configure\n  // the parser process. These options are recognized:\n\n  var defaultOptions = exports.defaultOptions = {\n    // `ecmaVersion` indicates the ECMAScript version to parse. Must\n    // be either 3 or 5. This\n    // influences support for strict mode, the set of reserved words, and\n    // support for getters and setter.\n    ecmaVersion: 5,\n    // Turn on `strictSemicolons` to prevent the parser from doing\n    // automatic semicolon insertion.\n    strictSemicolons: false,\n    // When `allowTrailingCommas` is false, the parser will not allow\n    // trailing commas in array and object literals.\n    allowTrailingCommas: true,\n    // By default, reserved words are not enforced. Enable\n    // `forbidReserved` to enforce them.\n    forbidReserved: false,\n    // When `locations` is on, `loc` properties holding objects with\n    // `start` and `end` properties in `{line, column}` form (with\n    // line being 1-based and column 0-based) will be attached to the\n    // nodes.\n    locations: false,\n    // A function can be passed as `onComment` option, which will\n    // cause Acorn to call that function with `(block, text, start,\n    // end)` parameters whenever a comment is skipped. `block` is a\n    // boolean indicating whether this is a block (`/* */`) comment,\n    // `text` is the content of the comment, and `start` and `end` are\n    // character offsets that denote the start and end of the comment.\n    // When the `locations` option is on, two more parameters are\n    // passed, the full `{line, column}` locations of the start and\n    // end of the comments.\n    onComment: null,\n    // Nodes have their start and end characters offsets recorded in\n    // `start` and `end` properties (directly on the node, rather than\n    // the `loc` object, which holds line/column data. To also add a\n    // [semi-standardized][range] `range` property holding a `[start,\n    // end]` array with the same numbers, set the `ranges` option to\n    // `true`.\n    //\n    // [range]: https://bugzilla.mozilla.org/show_bug.cgi?id=745678\n    ranges: false,\n    // It is possible to parse multiple files into a single AST by\n    // passing the tree produced by parsing the first file as\n    // `program` option in subsequent parses. This will add the\n    // toplevel forms of the parsed file to the `Program` (top) node\n    // of an existing parse tree.\n    program: null,\n    // When `location` is on, you can pass this to record the source\n    // file in every node's `loc` object.\n    sourceFile: null,\n    // This value, if given, is stored in every node, whether\n    // `location` is on or off.\n    directSourceFile: null\n  };\n\n  function setOptions(opts) {\n    options = opts || {};\n    for (var opt in defaultOptions) if (!Object.prototype.hasOwnProperty.call(options, opt))\n      options[opt] = defaultOptions[opt];\n    sourceFile = options.sourceFile || null;\n  }\n\n  // The `getLineInfo` function is mostly useful when the\n  // `locations` option is off (for performance reasons) and you\n  // want to find the line/column position for a given character\n  // offset. `input` should be the code string that the offset refers\n  // into.\n\n  var getLineInfo = exports.getLineInfo = function(input, offset) {\n    for (var line = 1, cur = 0;;) {\n      lineBreak.lastIndex = cur;\n      var match = lineBreak.exec(input);\n      if (match && match.index < offset) {\n        ++line;\n        cur = match.index + match[0].length;\n      } else break;\n    }\n    return {line: line, column: offset - cur};\n  };\n\n  // Acorn is organized as a tokenizer and a recursive-descent parser.\n  // The `tokenize` export provides an interface to the tokenizer.\n  // Because the tokenizer is optimized for being efficiently used by\n  // the Acorn parser itself, this interface is somewhat crude and not\n  // very modular. Performing another parse or call to `tokenize` will\n  // reset the internal state, and invalidate existing tokenizers.\n\n  exports.tokenize = function(inpt, opts) {\n    input = String(inpt); inputLen = input.length;\n    setOptions(opts);\n    initTokenState();\n\n    var t = {};\n    function getToken(forceRegexp) {\n      readToken(forceRegexp);\n      t.start = tokStart; t.end = tokEnd;\n      t.startLoc = tokStartLoc; t.endLoc = tokEndLoc;\n      t.type = tokType; t.value = tokVal;\n      return t;\n    }\n    getToken.jumpTo = function(pos, reAllowed) {\n      tokPos = pos;\n      if (options.locations) {\n        tokCurLine = 1;\n        tokLineStart = lineBreak.lastIndex = 0;\n        var match;\n        while ((match = lineBreak.exec(input)) && match.index < pos) {\n          ++tokCurLine;\n          tokLineStart = match.index + match[0].length;\n        }\n      }\n      tokRegexpAllowed = reAllowed;\n      skipSpace();\n    };\n    return getToken;\n  };\n\n  // State is kept in (closure-)global variables. We already saw the\n  // `options`, `input`, and `inputLen` variables above.\n\n  // The current position of the tokenizer in the input.\n\n  var tokPos;\n\n  // The start and end offsets of the current token.\n\n  var tokStart, tokEnd;\n\n  // When `options.locations` is true, these hold objects\n  // containing the tokens start and end line/column pairs.\n\n  var tokStartLoc, tokEndLoc;\n\n  // The type and value of the current token. Token types are objects,\n  // named by variables against which they can be compared, and\n  // holding properties that describe them (indicating, for example,\n  // the precedence of an infix operator, and the original name of a\n  // keyword token). The kind of value that's held in `tokVal` depends\n  // on the type of the token. For literals, it is the literal value,\n  // for operators, the operator name, and so on.\n\n  var tokType, tokVal;\n\n  // Interal state for the tokenizer. To distinguish between division\n  // operators and regular expressions, it remembers whether the last\n  // token was one that is allowed to be followed by an expression.\n  // (If it is, a slash is probably a regexp, if it isn't it's a\n  // division operator. See the `parseStatement` function for a\n  // caveat.)\n\n  var tokRegexpAllowed;\n\n  // When `options.locations` is true, these are used to keep\n  // track of the current line, and know when a new line has been\n  // entered.\n\n  var tokCurLine, tokLineStart;\n\n  // These store the position of the previous token, which is useful\n  // when finishing a node and assigning its `end` position.\n\n  var lastStart, lastEnd, lastEndLoc;\n\n  // This is the parser's state. `inFunction` is used to reject\n  // `return` statements outside of functions, `labels` to verify that\n  // `break` and `continue` have somewhere to jump to, and `strict`\n  // indicates whether strict mode is on.\n\n  var inFunction, labels, strict;\n\n  // This function is used to raise exceptions on parse errors. It\n  // takes an offset integer (into the current `input`) to indicate\n  // the location of the error, attaches the position to the end\n  // of the error message, and then raises a `SyntaxError` with that\n  // message.\n\n  function raise(pos, message) {\n    var loc = getLineInfo(input, pos);\n    message += \" (\" + loc.line + \":\" + loc.column + \")\";\n    var err = new SyntaxError(message);\n    err.pos = pos; err.loc = loc; err.raisedAt = tokPos;\n    throw err;\n  }\n\n  // Reused empty array added for node fields that are always empty.\n\n  var empty = [];\n\n  // ## Token types\n\n  // The assignment of fine-grained, information-carrying type objects\n  // allows the tokenizer to store the information it has about a\n  // token in a way that is very cheap for the parser to look up.\n\n  // All token type variables start with an underscore, to make them\n  // easy to recognize.\n\n  // These are the general types. The `type` property is only used to\n  // make them recognizeable when debugging.\n\n  var _num = {type: \"num\"}, _regexp = {type: \"regexp\"}, _string = {type: \"string\"};\n  var _name = {type: \"name\"}, _eof = {type: \"eof\"};\n\n  // Keyword tokens. The `keyword` property (also used in keyword-like\n  // operators) indicates that the token originated from an\n  // identifier-like word, which is used when parsing property names.\n  //\n  // The `beforeExpr` property is used to disambiguate between regular\n  // expressions and divisions. It is set on all token types that can\n  // be followed by an expression (thus, a slash after them would be a\n  // regular expression).\n  //\n  // `isLoop` marks a keyword as starting a loop, which is important\n  // to know when parsing a label, in order to allow or disallow\n  // continue jumps to that label.\n\n  var _break = {keyword: \"break\"}, _case = {keyword: \"case\", beforeExpr: true}, _catch = {keyword: \"catch\"};\n  var _continue = {keyword: \"continue\"}, _debugger = {keyword: \"debugger\"}, _default = {keyword: \"default\"};\n  var _do = {keyword: \"do\", isLoop: true}, _else = {keyword: \"else\", beforeExpr: true};\n  var _finally = {keyword: \"finally\"}, _for = {keyword: \"for\", isLoop: true}, _function = {keyword: \"function\"};\n  var _if = {keyword: \"if\"}, _return = {keyword: \"return\", beforeExpr: true}, _switch = {keyword: \"switch\"};\n  var _throw = {keyword: \"throw\", beforeExpr: true}, _try = {keyword: \"try\"}, _var = {keyword: \"var\"};\n  var _while = {keyword: \"while\", isLoop: true}, _with = {keyword: \"with\"}, _new = {keyword: \"new\", beforeExpr: true};\n  var _this = {keyword: \"this\"};\n\n  // The keywords that denote values.\n\n  var _null = {keyword: \"null\", atomValue: null}, _true = {keyword: \"true\", atomValue: true};\n  var _false = {keyword: \"false\", atomValue: false};\n\n  // Some keywords are treated as regular operators. `in` sometimes\n  // (when parsing `for`) needs to be tested against specifically, so\n  // we assign a variable name to it for quick comparing.\n\n  var _in = {keyword: \"in\", binop: 7, beforeExpr: true};\n\n  // Map keyword names to token types.\n\n  var keywordTypes = {\"break\": _break, \"case\": _case, \"catch\": _catch,\n                      \"continue\": _continue, \"debugger\": _debugger, \"default\": _default,\n                      \"do\": _do, \"else\": _else, \"finally\": _finally, \"for\": _for,\n                      \"function\": _function, \"if\": _if, \"return\": _return, \"switch\": _switch,\n                      \"throw\": _throw, \"try\": _try, \"var\": _var, \"while\": _while, \"with\": _with,\n                      \"null\": _null, \"true\": _true, \"false\": _false, \"new\": _new, \"in\": _in,\n                      \"instanceof\": {keyword: \"instanceof\", binop: 7, beforeExpr: true}, \"this\": _this,\n                      \"typeof\": {keyword: \"typeof\", prefix: true, beforeExpr: true},\n                      \"void\": {keyword: \"void\", prefix: true, beforeExpr: true},\n                      \"delete\": {keyword: \"delete\", prefix: true, beforeExpr: true}};\n\n  // Punctuation token types. Again, the `type` property is purely for debugging.\n\n  var _bracketL = {type: \"[\", beforeExpr: true}, _bracketR = {type: \"]\"}, _braceL = {type: \"{\", beforeExpr: true};\n  var _braceR = {type: \"}\"}, _parenL = {type: \"(\", beforeExpr: true}, _parenR = {type: \")\"};\n  var _comma = {type: \",\", beforeExpr: true}, _semi = {type: \";\", beforeExpr: true};\n  var _colon = {type: \":\", beforeExpr: true}, _dot = {type: \".\"}, _question = {type: \"?\", beforeExpr: true};\n\n  // Operators. These carry several kinds of properties to help the\n  // parser use them properly (the presence of these properties is\n  // what categorizes them as operators).\n  //\n  // `binop`, when present, specifies that this operator is a binary\n  // operator, and will refer to its precedence.\n  //\n  // `prefix` and `postfix` mark the operator as a prefix or postfix\n  // unary operator. `isUpdate` specifies that the node produced by\n  // the operator should be of type UpdateExpression rather than\n  // simply UnaryExpression (`++` and `--`).\n  //\n  // `isAssign` marks all of `=`, `+=`, `-=` etcetera, which act as\n  // binary operators with a very low precedence, that should result\n  // in AssignmentExpression nodes.\n\n  var _slash = {binop: 10, beforeExpr: true}, _eq = {isAssign: true, beforeExpr: true};\n  var _assign = {isAssign: true, beforeExpr: true};\n  var _incDec = {postfix: true, prefix: true, isUpdate: true}, _prefix = {prefix: true, beforeExpr: true};\n  var _logicalOR = {binop: 1, beforeExpr: true};\n  var _logicalAND = {binop: 2, beforeExpr: true};\n  var _bitwiseOR = {binop: 3, beforeExpr: true};\n  var _bitwiseXOR = {binop: 4, beforeExpr: true};\n  var _bitwiseAND = {binop: 5, beforeExpr: true};\n  var _equality = {binop: 6, beforeExpr: true};\n  var _relational = {binop: 7, beforeExpr: true};\n  var _bitShift = {binop: 8, beforeExpr: true};\n  var _plusMin = {binop: 9, prefix: true, beforeExpr: true};\n  var _multiplyModulo = {binop: 10, beforeExpr: true};\n\n  // Provide access to the token types for external users of the\n  // tokenizer.\n\n  exports.tokTypes = {bracketL: _bracketL, bracketR: _bracketR, braceL: _braceL, braceR: _braceR,\n                      parenL: _parenL, parenR: _parenR, comma: _comma, semi: _semi, colon: _colon,\n                      dot: _dot, question: _question, slash: _slash, eq: _eq, name: _name, eof: _eof,\n                      num: _num, regexp: _regexp, string: _string};\n  for (var kw in keywordTypes) exports.tokTypes[\"_\" + kw] = keywordTypes[kw];\n\n  // This is a trick taken from Esprima. It turns out that, on\n  // non-Chrome browsers, to check whether a string is in a set, a\n  // predicate containing a big ugly `switch` statement is faster than\n  // a regular expression, and on Chrome the two are about on par.\n  // This function uses `eval` (non-lexical) to produce such a\n  // predicate from a space-separated string of words.\n  //\n  // It starts by sorting the words by length.\n\n  function makePredicate(words) {\n    words = words.split(\" \");\n    var f = \"\", cats = [];\n    out: for (var i = 0; i < words.length; ++i) {\n      for (var j = 0; j < cats.length; ++j)\n        if (cats[j][0].length == words[i].length) {\n          cats[j].push(words[i]);\n          continue out;\n        }\n      cats.push([words[i]]);\n    }\n    function compareTo(arr) {\n      if (arr.length == 1) return f += \"return str === \" + JSON.stringify(arr[0]) + \";\";\n      f += \"switch(str){\";\n      for (var i = 0; i < arr.length; ++i) f += \"case \" + JSON.stringify(arr[i]) + \":\";\n      f += \"return true}return false;\";\n    }\n\n    // When there are more than three length categories, an outer\n    // switch first dispatches on the lengths, to save on comparisons.\n\n    if (cats.length > 3) {\n      cats.sort(function(a, b) {return b.length - a.length;});\n      f += \"switch(str.length){\";\n      for (var i = 0; i < cats.length; ++i) {\n        var cat = cats[i];\n        f += \"case \" + cat[0].length + \":\";\n        compareTo(cat);\n      }\n      f += \"}\";\n\n    // Otherwise, simply generate a flat `switch` statement.\n\n    } else {\n      compareTo(words);\n    }\n    return new Function(\"str\", f);\n  }\n\n  // The ECMAScript 3 reserved word list.\n\n  var isReservedWord3 = makePredicate(\"abstract boolean byte char class double enum export extends final float goto implements import int interface long native package private protected public short static super synchronized throws transient volatile\");\n\n  // ECMAScript 5 reserved words.\n\n  var isReservedWord5 = makePredicate(\"class enum extends super const export import\");\n\n  // The additional reserved words in strict mode.\n\n  var isStrictReservedWord = makePredicate(\"implements interface let package private protected public static yield\");\n\n  // The forbidden variable names in strict mode.\n\n  var isStrictBadIdWord = makePredicate(\"eval arguments\");\n\n  // And the keywords.\n\n  var isKeyword = makePredicate(\"break case catch continue debugger default do else finally for function if return switch throw try var while with null true false instanceof typeof void delete new in this\");\n\n  // ## Character categories\n\n  // Big ugly regular expressions that match characters in the\n  // whitespace, identifier, and identifier-start categories. These\n  // are only applied when a character is found to actually have a\n  // code point above 128.\n\n  var nonASCIIwhitespace = /[\\u1680\\u180e\\u2000-\\u200a\\u202f\\u205f\\u3000\\ufeff]/;\n  var nonASCIIidentifierStartChars = \"\\xaa\\xb5\\xba\\xc0-\\xd6\\xd8-\\xf6\\xf8-\\u02c1\\u02c6-\\u02d1\\u02e0-\\u02e4\\u02ec\\u02ee\\u0370-\\u0374\\u0376\\u0377\\u037a-\\u037d\\u0386\\u0388-\\u038a\\u038c\\u038e-\\u03a1\\u03a3-\\u03f5\\u03f7-\\u0481\\u048a-\\u0527\\u0531-\\u0556\\u0559\\u0561-\\u0587\\u05d0-\\u05ea\\u05f0-\\u05f2\\u0620-\\u064a\\u066e\\u066f\\u0671-\\u06d3\\u06d5\\u06e5\\u06e6\\u06ee\\u06ef\\u06fa-\\u06fc\\u06ff\\u0710\\u0712-\\u072f\\u074d-\\u07a5\\u07b1\\u07ca-\\u07ea\\u07f4\\u07f5\\u07fa\\u0800-\\u0815\\u081a\\u0824\\u0828\\u0840-\\u0858\\u08a0\\u08a2-\\u08ac\\u0904-\\u0939\\u093d\\u0950\\u0958-\\u0961\\u0971-\\u0977\\u0979-\\u097f\\u0985-\\u098c\\u098f\\u0990\\u0993-\\u09a8\\u09aa-\\u09b0\\u09b2\\u09b6-\\u09b9\\u09bd\\u09ce\\u09dc\\u09dd\\u09df-\\u09e1\\u09f0\\u09f1\\u0a05-\\u0a0a\\u0a0f\\u0a10\\u0a13-\\u0a28\\u0a2a-\\u0a30\\u0a32\\u0a33\\u0a35\\u0a36\\u0a38\\u0a39\\u0a59-\\u0a5c\\u0a5e\\u0a72-\\u0a74\\u0a85-\\u0a8d\\u0a8f-\\u0a91\\u0a93-\\u0aa8\\u0aaa-\\u0ab0\\u0ab2\\u0ab3\\u0ab5-\\u0ab9\\u0abd\\u0ad0\\u0ae0\\u0ae1\\u0b05-\\u0b0c\\u0b0f\\u0b10\\u0b13-\\u0b28\\u0b2a-\\u0b30\\u0b32\\u0b33\\u0b35-\\u0b39\\u0b3d\\u0b5c\\u0b5d\\u0b5f-\\u0b61\\u0b71\\u0b83\\u0b85-\\u0b8a\\u0b8e-\\u0b90\\u0b92-\\u0b95\\u0b99\\u0b9a\\u0b9c\\u0b9e\\u0b9f\\u0ba3\\u0ba4\\u0ba8-\\u0baa\\u0bae-\\u0bb9\\u0bd0\\u0c05-\\u0c0c\\u0c0e-\\u0c10\\u0c12-\\u0c28\\u0c2a-\\u0c33\\u0c35-\\u0c39\\u0c3d\\u0c58\\u0c59\\u0c60\\u0c61\\u0c85-\\u0c8c\\u0c8e-\\u0c90\\u0c92-\\u0ca8\\u0caa-\\u0cb3\\u0cb5-\\u0cb9\\u0cbd\\u0cde\\u0ce0\\u0ce1\\u0cf1\\u0cf2\\u0d05-\\u0d0c\\u0d0e-\\u0d10\\u0d12-\\u0d3a\\u0d3d\\u0d4e\\u0d60\\u0d61\\u0d7a-\\u0d7f\\u0d85-\\u0d96\\u0d9a-\\u0db1\\u0db3-\\u0dbb\\u0dbd\\u0dc0-\\u0dc6\\u0e01-\\u0e30\\u0e32\\u0e33\\u0e40-\\u0e46\\u0e81\\u0e82\\u0e84\\u0e87\\u0e88\\u0e8a\\u0e8d\\u0e94-\\u0e97\\u0e99-\\u0e9f\\u0ea1-\\u0ea3\\u0ea5\\u0ea7\\u0eaa\\u0eab\\u0ead-\\u0eb0\\u0eb2\\u0eb3\\u0ebd\\u0ec0-\\u0ec4\\u0ec6\\u0edc-\\u0edf\\u0f00\\u0f40-\\u0f47\\u0f49-\\u0f6c\\u0f88-\\u0f8c\\u1000-\\u102a\\u103f\\u1050-\\u1055\\u105a-\\u105d\\u1061\\u1065\\u1066\\u106e-\\u1070\\u1075-\\u1081\\u108e\\u10a0-\\u10c5\\u10c7\\u10cd\\u10d0-\\u10fa\\u10fc-\\u1248\\u124a-\\u124d\\u1250-\\u1256\\u1258\\u125a-\\u125d\\u1260-\\u1288\\u128a-\\u128d\\u1290-\\u12b0\\u12b2-\\u12b5\\u12b8-\\u12be\\u12c0\\u12c2-\\u12c5\\u12c8-\\u12d6\\u12d8-\\u1310\\u1312-\\u1315\\u1318-\\u135a\\u1380-\\u138f\\u13a0-\\u13f4\\u1401-\\u166c\\u166f-\\u167f\\u1681-\\u169a\\u16a0-\\u16ea\\u16ee-\\u16f0\\u1700-\\u170c\\u170e-\\u1711\\u1720-\\u1731\\u1740-\\u1751\\u1760-\\u176c\\u176e-\\u1770\\u1780-\\u17b3\\u17d7\\u17dc\\u1820-\\u1877\\u1880-\\u18a8\\u18aa\\u18b0-\\u18f5\\u1900-\\u191c\\u1950-\\u196d\\u1970-\\u1974\\u1980-\\u19ab\\u19c1-\\u19c7\\u1a00-\\u1a16\\u1a20-\\u1a54\\u1aa7\\u1b05-\\u1b33\\u1b45-\\u1b4b\\u1b83-\\u1ba0\\u1bae\\u1baf\\u1bba-\\u1be5\\u1c00-\\u1c23\\u1c4d-\\u1c4f\\u1c5a-\\u1c7d\\u1ce9-\\u1cec\\u1cee-\\u1cf1\\u1cf5\\u1cf6\\u1d00-\\u1dbf\\u1e00-\\u1f15\\u1f18-\\u1f1d\\u1f20-\\u1f45\\u1f48-\\u1f4d\\u1f50-\\u1f57\\u1f59\\u1f5b\\u1f5d\\u1f5f-\\u1f7d\\u1f80-\\u1fb4\\u1fb6-\\u1fbc\\u1fbe\\u1fc2-\\u1fc4\\u1fc6-\\u1fcc\\u1fd0-\\u1fd3\\u1fd6-\\u1fdb\\u1fe0-\\u1fec\\u1ff2-\\u1ff4\\u1ff6-\\u1ffc\\u2071\\u207f\\u2090-\\u209c\\u2102\\u2107\\u210a-\\u2113\\u2115\\u2119-\\u211d\\u2124\\u2126\\u2128\\u212a-\\u212d\\u212f-\\u2139\\u213c-\\u213f\\u2145-\\u2149\\u214e\\u2160-\\u2188\\u2c00-\\u2c2e\\u2c30-\\u2c5e\\u2c60-\\u2ce4\\u2ceb-\\u2cee\\u2cf2\\u2cf3\\u2d00-\\u2d25\\u2d27\\u2d2d\\u2d30-\\u2d67\\u2d6f\\u2d80-\\u2d96\\u2da0-\\u2da6\\u2da8-\\u2dae\\u2db0-\\u2db6\\u2db8-\\u2dbe\\u2dc0-\\u2dc6\\u2dc8-\\u2dce\\u2dd0-\\u2dd6\\u2dd8-\\u2dde\\u2e2f\\u3005-\\u3007\\u3021-\\u3029\\u3031-\\u3035\\u3038-\\u303c\\u3041-\\u3096\\u309d-\\u309f\\u30a1-\\u30fa\\u30fc-\\u30ff\\u3105-\\u312d\\u3131-\\u318e\\u31a0-\\u31ba\\u31f0-\\u31ff\\u3400-\\u4db5\\u4e00-\\u9fcc\\ua000-\\ua48c\\ua4d0-\\ua4fd\\ua500-\\ua60c\\ua610-\\ua61f\\ua62a\\ua62b\\ua640-\\ua66e\\ua67f-\\ua697\\ua6a0-\\ua6ef\\ua717-\\ua71f\\ua722-\\ua788\\ua78b-\\ua78e\\ua790-\\ua793\\ua7a0-\\ua7aa\\ua7f8-\\ua801\\ua803-\\ua805\\ua807-\\ua80a\\ua80c-\\ua822\\ua840-\\ua873\\ua882-\\ua8b3\\ua8f2-\\ua8f7\\ua8fb\\ua90a-\\ua925\\ua930-\\ua946\\ua960-\\ua97c\\ua984-\\ua9b2\\ua9cf\\uaa00-\\uaa28\\uaa40-\\uaa42\\uaa44-\\uaa4b\\uaa60-\\uaa76\\uaa7a\\uaa80-\\uaaaf\\uaab1\\uaab5\\uaab6\\uaab9-\\uaabd\\uaac0\\uaac2\\uaadb-\\uaadd\\uaae0-\\uaaea\\uaaf2-\\uaaf4\\uab01-\\uab06\\uab09-\\uab0e\\uab11-\\uab16\\uab20-\\uab26\\uab28-\\uab2e\\uabc0-\\uabe2\\uac00-\\ud7a3\\ud7b0-\\ud7c6\\ud7cb-\\ud7fb\\uf900-\\ufa6d\\ufa70-\\ufad9\\ufb00-\\ufb06\\ufb13-\\ufb17\\ufb1d\\ufb1f-\\ufb28\\ufb2a-\\ufb36\\ufb38-\\ufb3c\\ufb3e\\ufb40\\ufb41\\ufb43\\ufb44\\ufb46-\\ufbb1\\ufbd3-\\ufd3d\\ufd50-\\ufd8f\\ufd92-\\ufdc7\\ufdf0-\\ufdfb\\ufe70-\\ufe74\\ufe76-\\ufefc\\uff21-\\uff3a\\uff41-\\uff5a\\uff66-\\uffbe\\uffc2-\\uffc7\\uffca-\\uffcf\\uffd2-\\uffd7\\uffda-\\uffdc\";\n  var nonASCIIidentifierChars = \"\\u0300-\\u036f\\u0483-\\u0487\\u0591-\\u05bd\\u05bf\\u05c1\\u05c2\\u05c4\\u05c5\\u05c7\\u0610-\\u061a\\u0620-\\u0649\\u0672-\\u06d3\\u06e7-\\u06e8\\u06fb-\\u06fc\\u0730-\\u074a\\u0800-\\u0814\\u081b-\\u0823\\u0825-\\u0827\\u0829-\\u082d\\u0840-\\u0857\\u08e4-\\u08fe\\u0900-\\u0903\\u093a-\\u093c\\u093e-\\u094f\\u0951-\\u0957\\u0962-\\u0963\\u0966-\\u096f\\u0981-\\u0983\\u09bc\\u09be-\\u09c4\\u09c7\\u09c8\\u09d7\\u09df-\\u09e0\\u0a01-\\u0a03\\u0a3c\\u0a3e-\\u0a42\\u0a47\\u0a48\\u0a4b-\\u0a4d\\u0a51\\u0a66-\\u0a71\\u0a75\\u0a81-\\u0a83\\u0abc\\u0abe-\\u0ac5\\u0ac7-\\u0ac9\\u0acb-\\u0acd\\u0ae2-\\u0ae3\\u0ae6-\\u0aef\\u0b01-\\u0b03\\u0b3c\\u0b3e-\\u0b44\\u0b47\\u0b48\\u0b4b-\\u0b4d\\u0b56\\u0b57\\u0b5f-\\u0b60\\u0b66-\\u0b6f\\u0b82\\u0bbe-\\u0bc2\\u0bc6-\\u0bc8\\u0bca-\\u0bcd\\u0bd7\\u0be6-\\u0bef\\u0c01-\\u0c03\\u0c46-\\u0c48\\u0c4a-\\u0c4d\\u0c55\\u0c56\\u0c62-\\u0c63\\u0c66-\\u0c6f\\u0c82\\u0c83\\u0cbc\\u0cbe-\\u0cc4\\u0cc6-\\u0cc8\\u0cca-\\u0ccd\\u0cd5\\u0cd6\\u0ce2-\\u0ce3\\u0ce6-\\u0cef\\u0d02\\u0d03\\u0d46-\\u0d48\\u0d57\\u0d62-\\u0d63\\u0d66-\\u0d6f\\u0d82\\u0d83\\u0dca\\u0dcf-\\u0dd4\\u0dd6\\u0dd8-\\u0ddf\\u0df2\\u0df3\\u0e34-\\u0e3a\\u0e40-\\u0e45\\u0e50-\\u0e59\\u0eb4-\\u0eb9\\u0ec8-\\u0ecd\\u0ed0-\\u0ed9\\u0f18\\u0f19\\u0f20-\\u0f29\\u0f35\\u0f37\\u0f39\\u0f41-\\u0f47\\u0f71-\\u0f84\\u0f86-\\u0f87\\u0f8d-\\u0f97\\u0f99-\\u0fbc\\u0fc6\\u1000-\\u1029\\u1040-\\u1049\\u1067-\\u106d\\u1071-\\u1074\\u1082-\\u108d\\u108f-\\u109d\\u135d-\\u135f\\u170e-\\u1710\\u1720-\\u1730\\u1740-\\u1750\\u1772\\u1773\\u1780-\\u17b2\\u17dd\\u17e0-\\u17e9\\u180b-\\u180d\\u1810-\\u1819\\u1920-\\u192b\\u1930-\\u193b\\u1951-\\u196d\\u19b0-\\u19c0\\u19c8-\\u19c9\\u19d0-\\u19d9\\u1a00-\\u1a15\\u1a20-\\u1a53\\u1a60-\\u1a7c\\u1a7f-\\u1a89\\u1a90-\\u1a99\\u1b46-\\u1b4b\\u1b50-\\u1b59\\u1b6b-\\u1b73\\u1bb0-\\u1bb9\\u1be6-\\u1bf3\\u1c00-\\u1c22\\u1c40-\\u1c49\\u1c5b-\\u1c7d\\u1cd0-\\u1cd2\\u1d00-\\u1dbe\\u1e01-\\u1f15\\u200c\\u200d\\u203f\\u2040\\u2054\\u20d0-\\u20dc\\u20e1\\u20e5-\\u20f0\\u2d81-\\u2d96\\u2de0-\\u2dff\\u3021-\\u3028\\u3099\\u309a\\ua640-\\ua66d\\ua674-\\ua67d\\ua69f\\ua6f0-\\ua6f1\\ua7f8-\\ua800\\ua806\\ua80b\\ua823-\\ua827\\ua880-\\ua881\\ua8b4-\\ua8c4\\ua8d0-\\ua8d9\\ua8f3-\\ua8f7\\ua900-\\ua909\\ua926-\\ua92d\\ua930-\\ua945\\ua980-\\ua983\\ua9b3-\\ua9c0\\uaa00-\\uaa27\\uaa40-\\uaa41\\uaa4c-\\uaa4d\\uaa50-\\uaa59\\uaa7b\\uaae0-\\uaae9\\uaaf2-\\uaaf3\\uabc0-\\uabe1\\uabec\\uabed\\uabf0-\\uabf9\\ufb20-\\ufb28\\ufe00-\\ufe0f\\ufe20-\\ufe26\\ufe33\\ufe34\\ufe4d-\\ufe4f\\uff10-\\uff19\\uff3f\";\n  var nonASCIIidentifierStart = new RegExp(\"[\" + nonASCIIidentifierStartChars + \"]\");\n  var nonASCIIidentifier = new RegExp(\"[\" + nonASCIIidentifierStartChars + nonASCIIidentifierChars + \"]\");\n\n  // Whether a single character denotes a newline.\n\n  var newline = /[\\n\\r\\u2028\\u2029]/;\n\n  // Matches a whole line break (where CRLF is considered a single\n  // line break). Used to count lines.\n\n  var lineBreak = /\\r\\n|[\\n\\r\\u2028\\u2029]/g;\n\n  // Test whether a given character code starts an identifier.\n\n  var isIdentifierStart = exports.isIdentifierStart = function(code) {\n    if (code < 65) return code === 36;\n    if (code < 91) return true;\n    if (code < 97) return code === 95;\n    if (code < 123)return true;\n    return code >= 0xaa && nonASCIIidentifierStart.test(String.fromCharCode(code));\n  };\n\n  // Test whether a given character is part of an identifier.\n\n  var isIdentifierChar = exports.isIdentifierChar = function(code) {\n    if (code < 48) return code === 36;\n    if (code < 58) return true;\n    if (code < 65) return false;\n    if (code < 91) return true;\n    if (code < 97) return code === 95;\n    if (code < 123)return true;\n    return code >= 0xaa && nonASCIIidentifier.test(String.fromCharCode(code));\n  };\n\n  // ## Tokenizer\n\n  // These are used when `options.locations` is on, for the\n  // `tokStartLoc` and `tokEndLoc` properties.\n\n  function line_loc_t() {\n    this.line = tokCurLine;\n    this.column = tokPos - tokLineStart;\n  }\n\n  // Reset the token state. Used at the start of a parse.\n\n  function initTokenState() {\n    tokCurLine = 1;\n    tokPos = tokLineStart = 0;\n    tokRegexpAllowed = true;\n    skipSpace();\n  }\n\n  // Called at the end of every token. Sets `tokEnd`, `tokVal`, and\n  // `tokRegexpAllowed`, and skips the space after the token, so that\n  // the next one's `tokStart` will point at the right position.\n\n  function finishToken(type, val) {\n    tokEnd = tokPos;\n    if (options.locations) tokEndLoc = new line_loc_t;\n    tokType = type;\n    skipSpace();\n    tokVal = val;\n    tokRegexpAllowed = type.beforeExpr;\n  }\n\n  function skipBlockComment() {\n    var startLoc = options.onComment && options.locations && new line_loc_t;\n    var start = tokPos, end = input.indexOf(\"*/\", tokPos += 2);\n    if (end === -1) raise(tokPos - 2, \"Unterminated comment\");\n    tokPos = end + 2;\n    if (options.locations) {\n      lineBreak.lastIndex = start;\n      var match;\n      while ((match = lineBreak.exec(input)) && match.index < tokPos) {\n        ++tokCurLine;\n        tokLineStart = match.index + match[0].length;\n      }\n    }\n    if (options.onComment)\n      options.onComment(true, input.slice(start + 2, end), start, tokPos,\n                        startLoc, options.locations && new line_loc_t);\n  }\n\n  function skipLineComment() {\n    var start = tokPos;\n    var startLoc = options.onComment && options.locations && new line_loc_t;\n    var ch = input.charCodeAt(tokPos+=2);\n    while (tokPos < inputLen && ch !== 10 && ch !== 13 && ch !== 8232 && ch !== 8233) {\n      ++tokPos;\n      ch = input.charCodeAt(tokPos);\n    }\n    if (options.onComment)\n      options.onComment(false, input.slice(start + 2, tokPos), start, tokPos,\n                        startLoc, options.locations && new line_loc_t);\n  }\n\n  // Called at the start of the parse and after every token. Skips\n  // whitespace and comments, and.\n\n  function skipSpace() {\n    while (tokPos < inputLen) {\n      var ch = input.charCodeAt(tokPos);\n      if (ch === 32) { // ' '\n        ++tokPos;\n      } else if (ch === 13) {\n        ++tokPos;\n        var next = input.charCodeAt(tokPos);\n        if (next === 10) {\n          ++tokPos;\n        }\n        if (options.locations) {\n          ++tokCurLine;\n          tokLineStart = tokPos;\n        }\n      } else if (ch === 10 || ch === 8232 || ch === 8233) {\n        ++tokPos;\n        if (options.locations) {\n          ++tokCurLine;\n          tokLineStart = tokPos;\n        }\n      } else if (ch > 8 && ch < 14) {\n        ++tokPos;\n      } else if (ch === 47) { // '/'\n        var next = input.charCodeAt(tokPos + 1);\n        if (next === 42) { // '*'\n          skipBlockComment();\n        } else if (next === 47) { // '/'\n          skipLineComment();\n        } else break;\n      } else if (ch === 160) { // '\\xa0'\n        ++tokPos;\n      } else if (ch >= 5760 && nonASCIIwhitespace.test(String.fromCharCode(ch))) {\n        ++tokPos;\n      } else {\n        break;\n      }\n    }\n  }\n\n  // ### Token reading\n\n  // This is the function that is called to fetch the next token. It\n  // is somewhat obscure, because it works in character codes rather\n  // than characters, and because operator parsing has been inlined\n  // into it.\n  //\n  // All in the name of speed.\n  //\n  // The `forceRegexp` parameter is used in the one case where the\n  // `tokRegexpAllowed` trick does not work. See `parseStatement`.\n\n  function readToken_dot() {\n    var next = input.charCodeAt(tokPos + 1);\n    if (next >= 48 && next <= 57) return readNumber(true);\n    ++tokPos;\n    return finishToken(_dot);\n  }\n\n  function readToken_slash() { // '/'\n    var next = input.charCodeAt(tokPos + 1);\n    if (tokRegexpAllowed) {++tokPos; return readRegexp();}\n    if (next === 61) return finishOp(_assign, 2);\n    return finishOp(_slash, 1);\n  }\n\n  function readToken_mult_modulo() { // '%*'\n    var next = input.charCodeAt(tokPos + 1);\n    if (next === 61) return finishOp(_assign, 2);\n    return finishOp(_multiplyModulo, 1);\n  }\n\n  function readToken_pipe_amp(code) { // '|&'\n    var next = input.charCodeAt(tokPos + 1);\n    if (next === code) return finishOp(code === 124 ? _logicalOR : _logicalAND, 2);\n    if (next === 61) return finishOp(_assign, 2);\n    return finishOp(code === 124 ? _bitwiseOR : _bitwiseAND, 1);\n  }\n\n  function readToken_caret() { // '^'\n    var next = input.charCodeAt(tokPos + 1);\n    if (next === 61) return finishOp(_assign, 2);\n    return finishOp(_bitwiseXOR, 1);\n  }\n\n  function readToken_plus_min(code) { // '+-'\n    var next = input.charCodeAt(tokPos + 1);\n    if (next === code) {\n      if (next == 45 && input.charCodeAt(tokPos + 2) == 62 &&\n          newline.test(input.slice(lastEnd, tokPos))) {\n        // A `-->` line comment\n        tokPos += 3;\n        skipLineComment();\n        skipSpace();\n        return readToken();\n      }\n      return finishOp(_incDec, 2);\n    }\n    if (next === 61) return finishOp(_assign, 2);\n    return finishOp(_plusMin, 1);\n  }\n\n  function readToken_lt_gt(code) { // '<>'\n    var next = input.charCodeAt(tokPos + 1);\n    var size = 1;\n    if (next === code) {\n      size = code === 62 && input.charCodeAt(tokPos + 2) === 62 ? 3 : 2;\n      if (input.charCodeAt(tokPos + size) === 61) return finishOp(_assign, size + 1);\n      return finishOp(_bitShift, size);\n    }\n    if (next == 33 && code == 60 && input.charCodeAt(tokPos + 2) == 45 &&\n        input.charCodeAt(tokPos + 3) == 45) {\n      // `<!--`, an XML-style comment that should be interpreted as a line comment\n      tokPos += 4;\n      skipLineComment();\n      skipSpace();\n      return readToken();\n    }\n    if (next === 61)\n      size = input.charCodeAt(tokPos + 2) === 61 ? 3 : 2;\n    return finishOp(_relational, size);\n  }\n\n  function readToken_eq_excl(code) { // '=!'\n    var next = input.charCodeAt(tokPos + 1);\n    if (next === 61) return finishOp(_equality, input.charCodeAt(tokPos + 2) === 61 ? 3 : 2);\n    return finishOp(code === 61 ? _eq : _prefix, 1);\n  }\n\n  function getTokenFromCode(code) {\n    switch(code) {\n      // The interpretation of a dot depends on whether it is followed\n      // by a digit.\n    case 46: // '.'\n      return readToken_dot();\n\n      // Punctuation tokens.\n    case 40: ++tokPos; return finishToken(_parenL);\n    case 41: ++tokPos; return finishToken(_parenR);\n    case 59: ++tokPos; return finishToken(_semi);\n    case 44: ++tokPos; return finishToken(_comma);\n    case 91: ++tokPos; return finishToken(_bracketL);\n    case 93: ++tokPos; return finishToken(_bracketR);\n    case 123: ++tokPos; return finishToken(_braceL);\n    case 125: ++tokPos; return finishToken(_braceR);\n    case 58: ++tokPos; return finishToken(_colon);\n    case 63: ++tokPos; return finishToken(_question);\n\n      // '0x' is a hexadecimal number.\n    case 48: // '0'\n      var next = input.charCodeAt(tokPos + 1);\n      if (next === 120 || next === 88) return readHexNumber();\n      // Anything else beginning with a digit is an integer, octal\n      // number, or float.\n    case 49: case 50: case 51: case 52: case 53: case 54: case 55: case 56: case 57: // 1-9\n      return readNumber(false);\n\n      // Quotes produce strings.\n    case 34: case 39: // '\"', \"'\"\n      return readString(code);\n\n    // Operators are parsed inline in tiny state machines. '=' (61) is\n    // often referred to. `finishOp` simply skips the amount of\n    // characters it is given as second argument, and returns a token\n    // of the type given by its first argument.\n\n    case 47: // '/'\n      return readToken_slash(code);\n\n    case 37: case 42: // '%*'\n      return readToken_mult_modulo();\n\n    case 124: case 38: // '|&'\n      return readToken_pipe_amp(code);\n\n    case 94: // '^'\n      return readToken_caret();\n\n    case 43: case 45: // '+-'\n      return readToken_plus_min(code);\n\n    case 60: case 62: // '<>'\n      return readToken_lt_gt(code);\n\n    case 61: case 33: // '=!'\n      return readToken_eq_excl(code);\n\n    case 126: // '~'\n      return finishOp(_prefix, 1);\n    }\n\n    return false;\n  }\n\n  function readToken(forceRegexp) {\n    if (!forceRegexp) tokStart = tokPos;\n    else tokPos = tokStart + 1;\n    if (options.locations) tokStartLoc = new line_loc_t;\n    if (forceRegexp) return readRegexp();\n    if (tokPos >= inputLen) return finishToken(_eof);\n\n    var code = input.charCodeAt(tokPos);\n    // Identifier or keyword. '\\uXXXX' sequences are allowed in\n    // identifiers, so '\\' also dispatches to that.\n    if (isIdentifierStart(code) || code === 92 /* '\\' */) return readWord();\n\n    var tok = getTokenFromCode(code);\n\n    if (tok === false) {\n      // If we are here, we either found a non-ASCII identifier\n      // character, or something that's entirely disallowed.\n      var ch = String.fromCharCode(code);\n      if (ch === \"\\\\\" || nonASCIIidentifierStart.test(ch)) return readWord();\n      raise(tokPos, \"Unexpected character '\" + ch + \"'\");\n    }\n    return tok;\n  }\n\n  function finishOp(type, size) {\n    var str = input.slice(tokPos, tokPos + size);\n    tokPos += size;\n    finishToken(type, str);\n  }\n\n  // Parse a regular expression. Some context-awareness is necessary,\n  // since a '/' inside a '[]' set does not end the expression.\n\n  function readRegexp() {\n    var content = \"\", escaped, inClass, start = tokPos;\n    for (;;) {\n      if (tokPos >= inputLen) raise(start, \"Unterminated regular expression\");\n      var ch = input.charAt(tokPos);\n      if (newline.test(ch)) raise(start, \"Unterminated regular expression\");\n      if (!escaped) {\n        if (ch === \"[\") inClass = true;\n        else if (ch === \"]\" && inClass) inClass = false;\n        else if (ch === \"/\" && !inClass) break;\n        escaped = ch === \"\\\\\";\n      } else escaped = false;\n      ++tokPos;\n    }\n    var content = input.slice(start, tokPos);\n    ++tokPos;\n    // Need to use `readWord1` because '\\uXXXX' sequences are allowed\n    // here (don't ask).\n    var mods = readWord1();\n    if (mods && !/^[gmsiy]*$/.test(mods)) raise(start, \"Invalid regexp flag\");\n    return finishToken(_regexp, new RegExp(content, mods));\n  }\n\n  // Read an integer in the given radix. Return null if zero digits\n  // were read, the integer value otherwise. When `len` is given, this\n  // will return `null` unless the integer has exactly `len` digits.\n\n  function readInt(radix, len) {\n    var start = tokPos, total = 0;\n    for (var i = 0, e = len == null ? Infinity : len; i < e; ++i) {\n      var code = input.charCodeAt(tokPos), val;\n      if (code >= 97) val = code - 97 + 10; // a\n      else if (code >= 65) val = code - 65 + 10; // A\n      else if (code >= 48 && code <= 57) val = code - 48; // 0-9\n      else val = Infinity;\n      if (val >= radix) break;\n      ++tokPos;\n      total = total * radix + val;\n    }\n    if (tokPos === start || len != null && tokPos - start !== len) return null;\n\n    return total;\n  }\n\n  function readHexNumber() {\n    tokPos += 2; // 0x\n    var val = readInt(16);\n    if (val == null) raise(tokStart + 2, \"Expected hexadecimal number\");\n    if (isIdentifierStart(input.charCodeAt(tokPos))) raise(tokPos, \"Identifier directly after number\");\n    return finishToken(_num, val);\n  }\n\n  // Read an integer, octal integer, or floating-point number.\n\n  function readNumber(startsWithDot) {\n    var start = tokPos, isFloat = false, octal = input.charCodeAt(tokPos) === 48;\n    if (!startsWithDot && readInt(10) === null) raise(start, \"Invalid number\");\n    if (input.charCodeAt(tokPos) === 46) {\n      ++tokPos;\n      readInt(10);\n      isFloat = true;\n    }\n    var next = input.charCodeAt(tokPos);\n    if (next === 69 || next === 101) { // 'eE'\n      next = input.charCodeAt(++tokPos);\n      if (next === 43 || next === 45) ++tokPos; // '+-'\n      if (readInt(10) === null) raise(start, \"Invalid number\");\n      isFloat = true;\n    }\n    if (isIdentifierStart(input.charCodeAt(tokPos))) raise(tokPos, \"Identifier directly after number\");\n\n    var str = input.slice(start, tokPos), val;\n    if (isFloat) val = parseFloat(str);\n    else if (!octal || str.length === 1) val = parseInt(str, 10);\n    else if (/[89]/.test(str) || strict) raise(start, \"Invalid number\");\n    else val = parseInt(str, 8);\n    return finishToken(_num, val);\n  }\n\n  // Read a string value, interpreting backslash-escapes.\n\n  function readString(quote) {\n    tokPos++;\n    var out = \"\";\n    for (;;) {\n      if (tokPos >= inputLen) raise(tokStart, \"Unterminated string constant\");\n      var ch = input.charCodeAt(tokPos);\n      if (ch === quote) {\n        ++tokPos;\n        return finishToken(_string, out);\n      }\n      if (ch === 92) { // '\\'\n        ch = input.charCodeAt(++tokPos);\n        var octal = /^[0-7]+/.exec(input.slice(tokPos, tokPos + 3));\n        if (octal) octal = octal[0];\n        while (octal && parseInt(octal, 8) > 255) octal = octal.slice(0, -1);\n        if (octal === \"0\") octal = null;\n        ++tokPos;\n        if (octal) {\n          if (strict) raise(tokPos - 2, \"Octal literal in strict mode\");\n          out += String.fromCharCode(parseInt(octal, 8));\n          tokPos += octal.length - 1;\n        } else {\n          switch (ch) {\n          case 110: out += \"\\n\"; break; // 'n' -> '\\n'\n          case 114: out += \"\\r\"; break; // 'r' -> '\\r'\n          case 120: out += String.fromCharCode(readHexChar(2)); break; // 'x'\n          case 117: out += String.fromCharCode(readHexChar(4)); break; // 'u'\n          case 85: out += String.fromCharCode(readHexChar(8)); break; // 'U'\n          case 116: out += \"\\t\"; break; // 't' -> '\\t'\n          case 98: out += \"\\b\"; break; // 'b' -> '\\b'\n          case 118: out += \"\\u000b\"; break; // 'v' -> '\\u000b'\n          case 102: out += \"\\f\"; break; // 'f' -> '\\f'\n          case 48: out += \"\\0\"; break; // 0 -> '\\0'\n          case 13: if (input.charCodeAt(tokPos) === 10) ++tokPos; // '\\r\\n'\n          case 10: // ' \\n'\n            if (options.locations) { tokLineStart = tokPos; ++tokCurLine; }\n            break;\n          default: out += String.fromCharCode(ch); break;\n          }\n        }\n      } else {\n        if (ch === 13 || ch === 10 || ch === 8232 || ch === 8233) raise(tokStart, \"Unterminated string constant\");\n        out += String.fromCharCode(ch); // '\\'\n        ++tokPos;\n      }\n    }\n  }\n\n  // Used to read character escape sequences ('\\x', '\\u', '\\U').\n\n  function readHexChar(len) {\n    var n = readInt(16, len);\n    if (n === null) raise(tokStart, \"Bad character escape sequence\");\n    return n;\n  }\n\n  // Used to signal to callers of `readWord1` whether the word\n  // contained any escape sequences. This is needed because words with\n  // escape sequences must not be interpreted as keywords.\n\n  var containsEsc;\n\n  // Read an identifier, and return it as a string. Sets `containsEsc`\n  // to whether the word contained a '\\u' escape.\n  //\n  // Only builds up the word character-by-character when it actually\n  // containeds an escape, as a micro-optimization.\n\n  function readWord1() {\n    containsEsc = false;\n    var word, first = true, start = tokPos;\n    for (;;) {\n      var ch = input.charCodeAt(tokPos);\n      if (isIdentifierChar(ch)) {\n        if (containsEsc) word += input.charAt(tokPos);\n        ++tokPos;\n      } else if (ch === 92) { // \"\\\"\n        if (!containsEsc) word = input.slice(start, tokPos);\n        containsEsc = true;\n        if (input.charCodeAt(++tokPos) != 117) // \"u\"\n          raise(tokPos, \"Expecting Unicode escape sequence \\\\uXXXX\");\n        ++tokPos;\n        var esc = readHexChar(4);\n        var escStr = String.fromCharCode(esc);\n        if (!escStr) raise(tokPos - 1, \"Invalid Unicode escape\");\n        if (!(first ? isIdentifierStart(esc) : isIdentifierChar(esc)))\n          raise(tokPos - 4, \"Invalid Unicode escape\");\n        word += escStr;\n      } else {\n        break;\n      }\n      first = false;\n    }\n    return containsEsc ? word : input.slice(start, tokPos);\n  }\n\n  // Read an identifier or keyword token. Will check for reserved\n  // words when necessary.\n\n  function readWord() {\n    var word = readWord1();\n    var type = _name;\n    if (!containsEsc) {\n      if (isKeyword(word)) type = keywordTypes[word];\n      else if (options.forbidReserved &&\n               (options.ecmaVersion === 3 ? isReservedWord3 : isReservedWord5)(word) ||\n               strict && isStrictReservedWord(word))\n        raise(tokStart, \"The keyword '\" + word + \"' is reserved\");\n    }\n    return finishToken(type, word);\n  }\n\n  // ## Parser\n\n  // A recursive descent parser operates by defining functions for all\n  // syntactic elements, and recursively calling those, each function\n  // advancing the input stream and returning an AST node. Precedence\n  // of constructs (for example, the fact that `!x[1]` means `!(x[1])`\n  // instead of `(!x)[1]` is handled by the fact that the parser\n  // function that parses unary prefix operators is called first, and\n  // in turn calls the function that parses `[]` subscripts — that\n  // way, it'll receive the node for `x[1]` already parsed, and wraps\n  // *that* in the unary operator node.\n  //\n  // Acorn uses an [operator precedence parser][opp] to handle binary\n  // operator precedence, because it is much more compact than using\n  // the technique outlined above, which uses different, nesting\n  // functions to specify precedence, for all of the ten binary\n  // precedence levels that JavaScript defines.\n  //\n  // [opp]: http://en.wikipedia.org/wiki/Operator-precedence_parser\n\n  // ### Parser utilities\n\n  // Continue to the next token.\n\n  function next() {\n    lastStart = tokStart;\n    lastEnd = tokEnd;\n    lastEndLoc = tokEndLoc;\n    readToken();\n  }\n\n  // Enter strict mode. Re-reads the next token to please pedantic\n  // tests (\"use strict\"; 010; -- should fail).\n\n  function setStrict(strct) {\n    strict = strct;\n    tokPos = lastEnd;\n    if (options.locations) {\n      while (tokPos < tokLineStart) {\n        tokLineStart = input.lastIndexOf(\"\\n\", tokLineStart - 2) + 1;\n        --tokCurLine;\n      }\n    }\n    skipSpace();\n    readToken();\n  }\n\n  // Start an AST node, attaching a start offset.\n\n  function node_t() {\n    this.type = null;\n    this.start = tokStart;\n    this.end = null;\n  }\n\n  function node_loc_t() {\n    this.start = tokStartLoc;\n    this.end = null;\n    if (sourceFile !== null) this.source = sourceFile;\n  }\n\n  function startNode() {\n    var node = new node_t();\n    if (options.locations)\n      node.loc = new node_loc_t();\n    if (options.directSourceFile)\n      node.sourceFile = options.directSourceFile;\n    if (options.ranges)\n      node.range = [tokStart, 0];\n    return node;\n  }\n\n  // Start a node whose start offset information should be based on\n  // the start of another node. For example, a binary operator node is\n  // only started after its left-hand side has already been parsed.\n\n  function startNodeFrom(other) {\n    var node = new node_t();\n    node.start = other.start;\n    if (options.locations) {\n      node.loc = new node_loc_t();\n      node.loc.start = other.loc.start;\n    }\n    if (options.ranges)\n      node.range = [other.range[0], 0];\n\n    return node;\n  }\n\n  // Finish an AST node, adding `type` and `end` properties.\n\n  function finishNode(node, type) {\n    node.type = type;\n    node.end = lastEnd;\n    if (options.locations)\n      node.loc.end = lastEndLoc;\n    if (options.ranges)\n      node.range[1] = lastEnd;\n    return node;\n  }\n\n  // Test whether a statement node is the string literal `\"use strict\"`.\n\n  function isUseStrict(stmt) {\n    return options.ecmaVersion >= 5 && stmt.type === \"ExpressionStatement\" &&\n      stmt.expression.type === \"Literal\" && stmt.expression.value === \"use strict\";\n  }\n\n  // Predicate that tests whether the next token is of the given\n  // type, and if yes, consumes it as a side effect.\n\n  function eat(type) {\n    if (tokType === type) {\n      next();\n      return true;\n    }\n  }\n\n  // Test whether a semicolon can be inserted at the current position.\n\n  function canInsertSemicolon() {\n    return !options.strictSemicolons &&\n      (tokType === _eof || tokType === _braceR || newline.test(input.slice(lastEnd, tokStart)));\n  }\n\n  // Consume a semicolon, or, failing that, see if we are allowed to\n  // pretend that there is a semicolon at this position.\n\n  function semicolon() {\n    if (!eat(_semi) && !canInsertSemicolon()) unexpected();\n  }\n\n  // Expect a token of a given type. If found, consume it, otherwise,\n  // raise an unexpected token error.\n\n  function expect(type) {\n    if (tokType === type) next();\n    else unexpected();\n  }\n\n  // Raise an unexpected token error.\n\n  function unexpected() {\n    raise(tokStart, \"Unexpected token\");\n  }\n\n  // Verify that a node is an lval — something that can be assigned\n  // to.\n\n  function checkLVal(expr) {\n    if (expr.type !== \"Identifier\" && expr.type !== \"MemberExpression\")\n      raise(expr.start, \"Assigning to rvalue\");\n    if (strict && expr.type === \"Identifier\" && isStrictBadIdWord(expr.name))\n      raise(expr.start, \"Assigning to \" + expr.name + \" in strict mode\");\n  }\n\n  // ### Statement parsing\n\n  // Parse a program. Initializes the parser, reads any number of\n  // statements, and wraps them in a Program node.  Optionally takes a\n  // `program` argument.  If present, the statements will be appended\n  // to its body instead of creating a new node.\n\n  function parseTopLevel(program) {\n    lastStart = lastEnd = tokPos;\n    if (options.locations) lastEndLoc = new line_loc_t;\n    inFunction = strict = null;\n    labels = [];\n    readToken();\n\n    var node = program || startNode(), first = true;\n    if (!program) node.body = [];\n    while (tokType !== _eof) {\n      var stmt = parseStatement();\n      node.body.push(stmt);\n      if (first && isUseStrict(stmt)) setStrict(true);\n      first = false;\n    }\n    return finishNode(node, \"Program\");\n  }\n\n  var loopLabel = {kind: \"loop\"}, switchLabel = {kind: \"switch\"};\n\n  // Parse a single statement.\n  //\n  // If expecting a statement and finding a slash operator, parse a\n  // regular expression literal. This is to handle cases like\n  // `if (foo) /blah/.exec(foo);`, where looking at the previous token\n  // does not help.\n\n  function parseStatement() {\n    if (tokType === _slash || tokType === _assign && tokVal == \"/=\")\n      readToken(true);\n\n    var starttype = tokType, node = startNode();\n\n    // Most types of statements are recognized by the keyword they\n    // start with. Many are trivial to parse, some require a bit of\n    // complexity.\n\n    switch (starttype) {\n    case _break: case _continue:\n      next();\n      var isBreak = starttype === _break;\n      if (eat(_semi) || canInsertSemicolon()) node.label = null;\n      else if (tokType !== _name) unexpected();\n      else {\n        node.label = parseIdent();\n        semicolon();\n      }\n\n      // Verify that there is an actual destination to break or\n      // continue to.\n      for (var i = 0; i < labels.length; ++i) {\n        var lab = labels[i];\n        if (node.label == null || lab.name === node.label.name) {\n          if (lab.kind != null && (isBreak || lab.kind === \"loop\")) break;\n          if (node.label && isBreak) break;\n        }\n      }\n      if (i === labels.length) raise(node.start, \"Unsyntactic \" + starttype.keyword);\n      return finishNode(node, isBreak ? \"BreakStatement\" : \"ContinueStatement\");\n\n    case _debugger:\n      next();\n      semicolon();\n      return finishNode(node, \"DebuggerStatement\");\n\n    case _do:\n      next();\n      labels.push(loopLabel);\n      node.body = parseStatement();\n      labels.pop();\n      expect(_while);\n      node.test = parseParenExpression();\n      semicolon();\n      return finishNode(node, \"DoWhileStatement\");\n\n      // Disambiguating between a `for` and a `for`/`in` loop is\n      // non-trivial. Basically, we have to parse the init `var`\n      // statement or expression, disallowing the `in` operator (see\n      // the second parameter to `parseExpression`), and then check\n      // whether the next token is `in`. When there is no init part\n      // (semicolon immediately after the opening parenthesis), it is\n      // a regular `for` loop.\n\n    case _for:\n      next();\n      labels.push(loopLabel);\n      expect(_parenL);\n      if (tokType === _semi) return parseFor(node, null);\n      if (tokType === _var) {\n        var init = startNode();\n        next();\n        parseVar(init, true);\n        finishNode(init, \"VariableDeclaration\");\n        if (init.declarations.length === 1 && eat(_in))\n          return parseForIn(node, init);\n        return parseFor(node, init);\n      }\n      var init = parseExpression(false, true);\n      if (eat(_in)) {checkLVal(init); return parseForIn(node, init);}\n      return parseFor(node, init);\n\n    case _function:\n      next();\n      return parseFunction(node, true);\n\n    case _if:\n      next();\n      node.test = parseParenExpression();\n      node.consequent = parseStatement();\n      node.alternate = eat(_else) ? parseStatement() : null;\n      return finishNode(node, \"IfStatement\");\n\n    case _return:\n      if (!inFunction) raise(tokStart, \"'return' outside of function\");\n      next();\n\n      // In `return` (and `break`/`continue`), the keywords with\n      // optional arguments, we eagerly look for a semicolon or the\n      // possibility to insert one.\n\n      if (eat(_semi) || canInsertSemicolon()) node.argument = null;\n      else { node.argument = parseExpression(); semicolon(); }\n      return finishNode(node, \"ReturnStatement\");\n\n    case _switch:\n      next();\n      node.discriminant = parseParenExpression();\n      node.cases = [];\n      expect(_braceL);\n      labels.push(switchLabel);\n\n      // Statements under must be grouped (by label) in SwitchCase\n      // nodes. `cur` is used to keep the node that we are currently\n      // adding statements to.\n\n      for (var cur, sawDefault; tokType != _braceR;) {\n        if (tokType === _case || tokType === _default) {\n          var isCase = tokType === _case;\n          if (cur) finishNode(cur, \"SwitchCase\");\n          node.cases.push(cur = startNode());\n          cur.consequent = [];\n          next();\n          if (isCase) cur.test = parseExpression();\n          else {\n            if (sawDefault) raise(lastStart, \"Multiple default clauses\"); sawDefault = true;\n            cur.test = null;\n          }\n          expect(_colon);\n        } else {\n          if (!cur) unexpected();\n          cur.consequent.push(parseStatement());\n        }\n      }\n      if (cur) finishNode(cur, \"SwitchCase\");\n      next(); // Closing brace\n      labels.pop();\n      return finishNode(node, \"SwitchStatement\");\n\n    case _throw:\n      next();\n      if (newline.test(input.slice(lastEnd, tokStart)))\n        raise(lastEnd, \"Illegal newline after throw\");\n      node.argument = parseExpression();\n      semicolon();\n      return finishNode(node, \"ThrowStatement\");\n\n    case _try:\n      next();\n      node.block = parseBlock();\n      node.handler = null;\n      if (tokType === _catch) {\n        var clause = startNode();\n        next();\n        expect(_parenL);\n        clause.param = parseIdent();\n        if (strict && isStrictBadIdWord(clause.param.name))\n          raise(clause.param.start, \"Binding \" + clause.param.name + \" in strict mode\");\n        expect(_parenR);\n        clause.guard = null;\n        clause.body = parseBlock();\n        node.handler = finishNode(clause, \"CatchClause\");\n      }\n      node.guardedHandlers = empty;\n      node.finalizer = eat(_finally) ? parseBlock() : null;\n      if (!node.handler && !node.finalizer)\n        raise(node.start, \"Missing catch or finally clause\");\n      return finishNode(node, \"TryStatement\");\n\n    case _var:\n      next();\n      parseVar(node);\n      semicolon();\n      return finishNode(node, \"VariableDeclaration\");\n\n    case _while:\n      next();\n      node.test = parseParenExpression();\n      labels.push(loopLabel);\n      node.body = parseStatement();\n      labels.pop();\n      return finishNode(node, \"WhileStatement\");\n\n    case _with:\n      if (strict) raise(tokStart, \"'with' in strict mode\");\n      next();\n      node.object = parseParenExpression();\n      node.body = parseStatement();\n      return finishNode(node, \"WithStatement\");\n\n    case _braceL:\n      return parseBlock();\n\n    case _semi:\n      next();\n      return finishNode(node, \"EmptyStatement\");\n\n      // If the statement does not start with a statement keyword or a\n      // brace, it's an ExpressionStatement or LabeledStatement. We\n      // simply start parsing an expression, and afterwards, if the\n      // next token is a colon and the expression was a simple\n      // Identifier node, we switch to interpreting it as a label.\n\n    default:\n      var maybeName = tokVal, expr = parseExpression();\n      if (starttype === _name && expr.type === \"Identifier\" && eat(_colon)) {\n        for (var i = 0; i < labels.length; ++i)\n          if (labels[i].name === maybeName) raise(expr.start, \"Label '\" + maybeName + \"' is already declared\");\n        var kind = tokType.isLoop ? \"loop\" : tokType === _switch ? \"switch\" : null;\n        labels.push({name: maybeName, kind: kind});\n        node.body = parseStatement();\n        labels.pop();\n        node.label = expr;\n        return finishNode(node, \"LabeledStatement\");\n      } else {\n        node.expression = expr;\n        semicolon();\n        return finishNode(node, \"ExpressionStatement\");\n      }\n    }\n  }\n\n  // Used for constructs like `switch` and `if` that insist on\n  // parentheses around their expression.\n\n  function parseParenExpression() {\n    expect(_parenL);\n    var val = parseExpression();\n    expect(_parenR);\n    return val;\n  }\n\n  // Parse a semicolon-enclosed block of statements, handling `\"use\n  // strict\"` declarations when `allowStrict` is true (used for\n  // function bodies).\n\n  function parseBlock(allowStrict) {\n    var node = startNode(), first = true, strict = false, oldStrict;\n    node.body = [];\n    expect(_braceL);\n    while (!eat(_braceR)) {\n      var stmt = parseStatement();\n      node.body.push(stmt);\n      if (first && allowStrict && isUseStrict(stmt)) {\n        oldStrict = strict;\n        setStrict(strict = true);\n      }\n      first = false;\n    }\n    if (strict && !oldStrict) setStrict(false);\n    return finishNode(node, \"BlockStatement\");\n  }\n\n  // Parse a regular `for` loop. The disambiguation code in\n  // `parseStatement` will already have parsed the init statement or\n  // expression.\n\n  function parseFor(node, init) {\n    node.init = init;\n    expect(_semi);\n    node.test = tokType === _semi ? null : parseExpression();\n    expect(_semi);\n    node.update = tokType === _parenR ? null : parseExpression();\n    expect(_parenR);\n    node.body = parseStatement();\n    labels.pop();\n    return finishNode(node, \"ForStatement\");\n  }\n\n  // Parse a `for`/`in` loop.\n\n  function parseForIn(node, init) {\n    node.left = init;\n    node.right = parseExpression();\n    expect(_parenR);\n    node.body = parseStatement();\n    labels.pop();\n    return finishNode(node, \"ForInStatement\");\n  }\n\n  // Parse a list of variable declarations.\n\n  function parseVar(node, noIn) {\n    node.declarations = [];\n    node.kind = \"var\";\n    for (;;) {\n      var decl = startNode();\n      decl.id = parseIdent();\n      if (strict && isStrictBadIdWord(decl.id.name))\n        raise(decl.id.start, \"Binding \" + decl.id.name + \" in strict mode\");\n      decl.init = eat(_eq) ? parseExpression(true, noIn) : null;\n      node.declarations.push(finishNode(decl, \"VariableDeclarator\"));\n      if (!eat(_comma)) break;\n    }\n    return node;\n  }\n\n  // ### Expression parsing\n\n  // These nest, from the most general expression type at the top to\n  // 'atomic', nondivisible expression types at the bottom. Most of\n  // the functions will simply let the function(s) below them parse,\n  // and, *if* the syntactic construct they handle is present, wrap\n  // the AST node that the inner parser gave them in another node.\n\n  // Parse a full expression. The arguments are used to forbid comma\n  // sequences (in argument lists, array literals, or object literals)\n  // or the `in` operator (in for loops initalization expressions).\n\n  function parseExpression(noComma, noIn) {\n    var expr = parseMaybeAssign(noIn);\n    if (!noComma && tokType === _comma) {\n      var node = startNodeFrom(expr);\n      node.expressions = [expr];\n      while (eat(_comma)) node.expressions.push(parseMaybeAssign(noIn));\n      return finishNode(node, \"SequenceExpression\");\n    }\n    return expr;\n  }\n\n  // Parse an assignment expression. This includes applications of\n  // operators like `+=`.\n\n  function parseMaybeAssign(noIn) {\n    var left = parseMaybeConditional(noIn);\n    if (tokType.isAssign) {\n      var node = startNodeFrom(left);\n      node.operator = tokVal;\n      node.left = left;\n      next();\n      node.right = parseMaybeAssign(noIn);\n      checkLVal(left);\n      return finishNode(node, \"AssignmentExpression\");\n    }\n    return left;\n  }\n\n  // Parse a ternary conditional (`?:`) operator.\n\n  function parseMaybeConditional(noIn) {\n    var expr = parseExprOps(noIn);\n    if (eat(_question)) {\n      var node = startNodeFrom(expr);\n      node.test = expr;\n      node.consequent = parseExpression(true);\n      expect(_colon);\n      node.alternate = parseExpression(true, noIn);\n      return finishNode(node, \"ConditionalExpression\");\n    }\n    return expr;\n  }\n\n  // Start the precedence parser.\n\n  function parseExprOps(noIn) {\n    return parseExprOp(parseMaybeUnary(), -1, noIn);\n  }\n\n  // Parse binary operators with the operator precedence parsing\n  // algorithm. `left` is the left-hand side of the operator.\n  // `minPrec` provides context that allows the function to stop and\n  // defer further parser to one of its callers when it encounters an\n  // operator that has a lower precedence than the set it is parsing.\n\n  function parseExprOp(left, minPrec, noIn) {\n    var prec = tokType.binop;\n    if (prec != null && (!noIn || tokType !== _in)) {\n      if (prec > minPrec) {\n        var node = startNodeFrom(left);\n        node.left = left;\n        node.operator = tokVal;\n        var op = tokType;\n        next();\n        node.right = parseExprOp(parseMaybeUnary(), prec, noIn);\n        var exprNode = finishNode(node, (op === _logicalOR || op === _logicalAND) ? \"LogicalExpression\" : \"BinaryExpression\");\n        return parseExprOp(exprNode, minPrec, noIn);\n      }\n    }\n    return left;\n  }\n\n  // Parse unary operators, both prefix and postfix.\n\n  function parseMaybeUnary() {\n    if (tokType.prefix) {\n      var node = startNode(), update = tokType.isUpdate;\n      node.operator = tokVal;\n      node.prefix = true;\n      tokRegexpAllowed = true;\n      next();\n      node.argument = parseMaybeUnary();\n      if (update) checkLVal(node.argument);\n      else if (strict && node.operator === \"delete\" &&\n               node.argument.type === \"Identifier\")\n        raise(node.start, \"Deleting local variable in strict mode\");\n      return finishNode(node, update ? \"UpdateExpression\" : \"UnaryExpression\");\n    }\n    var expr = parseExprSubscripts();\n    while (tokType.postfix && !canInsertSemicolon()) {\n      var node = startNodeFrom(expr);\n      node.operator = tokVal;\n      node.prefix = false;\n      node.argument = expr;\n      checkLVal(expr);\n      next();\n      expr = finishNode(node, \"UpdateExpression\");\n    }\n    return expr;\n  }\n\n  // Parse call, dot, and `[]`-subscript expressions.\n\n  function parseExprSubscripts() {\n    return parseSubscripts(parseExprAtom());\n  }\n\n  function parseSubscripts(base, noCalls) {\n    if (eat(_dot)) {\n      var node = startNodeFrom(base);\n      node.object = base;\n      node.property = parseIdent(true);\n      node.computed = false;\n      return parseSubscripts(finishNode(node, \"MemberExpression\"), noCalls);\n    } else if (eat(_bracketL)) {\n      var node = startNodeFrom(base);\n      node.object = base;\n      node.property = parseExpression();\n      node.computed = true;\n      expect(_bracketR);\n      return parseSubscripts(finishNode(node, \"MemberExpression\"), noCalls);\n    } else if (!noCalls && eat(_parenL)) {\n      var node = startNodeFrom(base);\n      node.callee = base;\n      node.arguments = parseExprList(_parenR, false);\n      return parseSubscripts(finishNode(node, \"CallExpression\"), noCalls);\n    } else return base;\n  }\n\n  // Parse an atomic expression — either a single token that is an\n  // expression, an expression started by a keyword like `function` or\n  // `new`, or an expression wrapped in punctuation like `()`, `[]`,\n  // or `{}`.\n\n  function parseExprAtom() {\n    switch (tokType) {\n    case _this:\n      var node = startNode();\n      next();\n      return finishNode(node, \"ThisExpression\");\n    case _name:\n      return parseIdent();\n    case _num: case _string: case _regexp:\n      var node = startNode();\n      node.value = tokVal;\n      node.raw = input.slice(tokStart, tokEnd);\n      next();\n      return finishNode(node, \"Literal\");\n\n    case _null: case _true: case _false:\n      var node = startNode();\n      node.value = tokType.atomValue;\n      node.raw = tokType.keyword;\n      next();\n      return finishNode(node, \"Literal\");\n\n    case _parenL:\n      var tokStartLoc1 = tokStartLoc, tokStart1 = tokStart;\n      next();\n      var val = parseExpression();\n      val.start = tokStart1;\n      val.end = tokEnd;\n      if (options.locations) {\n        val.loc.start = tokStartLoc1;\n        val.loc.end = tokEndLoc;\n      }\n      if (options.ranges)\n        val.range = [tokStart1, tokEnd];\n      expect(_parenR);\n      return val;\n\n    case _bracketL:\n      var node = startNode();\n      next();\n      node.elements = parseExprList(_bracketR, true, true);\n      return finishNode(node, \"ArrayExpression\");\n\n    case _braceL:\n      return parseObj();\n\n    case _function:\n      var node = startNode();\n      next();\n      return parseFunction(node, false);\n\n    case _new:\n      return parseNew();\n\n    default:\n      unexpected();\n    }\n  }\n\n  // New's precedence is slightly tricky. It must allow its argument\n  // to be a `[]` or dot subscript expression, but not a call — at\n  // least, not without wrapping it in parentheses. Thus, it uses the\n\n  function parseNew() {\n    var node = startNode();\n    next();\n    node.callee = parseSubscripts(parseExprAtom(), true);\n    if (eat(_parenL)) node.arguments = parseExprList(_parenR, false);\n    else node.arguments = empty;\n    return finishNode(node, \"NewExpression\");\n  }\n\n  // Parse an object literal.\n\n  function parseObj() {\n    var node = startNode(), first = true, sawGetSet = false;\n    node.properties = [];\n    next();\n    while (!eat(_braceR)) {\n      if (!first) {\n        expect(_comma);\n        if (options.allowTrailingCommas && eat(_braceR)) break;\n      } else first = false;\n\n      var prop = {key: parsePropertyName()}, isGetSet = false, kind;\n      if (eat(_colon)) {\n        prop.value = parseExpression(true);\n        kind = prop.kind = \"init\";\n      } else if (options.ecmaVersion >= 5 && prop.key.type === \"Identifier\" &&\n                 (prop.key.name === \"get\" || prop.key.name === \"set\")) {\n        isGetSet = sawGetSet = true;\n        kind = prop.kind = prop.key.name;\n        prop.key = parsePropertyName();\n        if (tokType !== _parenL) unexpected();\n        prop.value = parseFunction(startNode(), false);\n      } else unexpected();\n\n      // getters and setters are not allowed to clash — either with\n      // each other or with an init property — and in strict mode,\n      // init properties are also not allowed to be repeated.\n\n      if (prop.key.type === \"Identifier\" && (strict || sawGetSet)) {\n        for (var i = 0; i < node.properties.length; ++i) {\n          var other = node.properties[i];\n          if (other.key.name === prop.key.name) {\n            var conflict = kind == other.kind || isGetSet && other.kind === \"init\" ||\n              kind === \"init\" && (other.kind === \"get\" || other.kind === \"set\");\n            if (conflict && !strict && kind === \"init\" && other.kind === \"init\") conflict = false;\n            if (conflict) raise(prop.key.start, \"Redefinition of property\");\n          }\n        }\n      }\n      node.properties.push(prop);\n    }\n    return finishNode(node, \"ObjectExpression\");\n  }\n\n  function parsePropertyName() {\n    if (tokType === _num || tokType === _string) return parseExprAtom();\n    return parseIdent(true);\n  }\n\n  // Parse a function declaration or literal (depending on the\n  // `isStatement` parameter).\n\n  function parseFunction(node, isStatement) {\n    if (tokType === _name) node.id = parseIdent();\n    else if (isStatement) unexpected();\n    else node.id = null;\n    node.params = [];\n    var first = true;\n    expect(_parenL);\n    while (!eat(_parenR)) {\n      if (!first) expect(_comma); else first = false;\n      node.params.push(parseIdent());\n    }\n\n    // Start a new scope with regard to labels and the `inFunction`\n    // flag (restore them to their old value afterwards).\n    var oldInFunc = inFunction, oldLabels = labels;\n    inFunction = true; labels = [];\n    node.body = parseBlock(true);\n    inFunction = oldInFunc; labels = oldLabels;\n\n    // If this is a strict mode function, verify that argument names\n    // are not repeated, and it does not try to bind the words `eval`\n    // or `arguments`.\n    if (strict || node.body.body.length && isUseStrict(node.body.body[0])) {\n      for (var i = node.id ? -1 : 0; i < node.params.length; ++i) {\n        var id = i < 0 ? node.id : node.params[i];\n        if (isStrictReservedWord(id.name) || isStrictBadIdWord(id.name))\n          raise(id.start, \"Defining '\" + id.name + \"' in strict mode\");\n        if (i >= 0) for (var j = 0; j < i; ++j) if (id.name === node.params[j].name)\n          raise(id.start, \"Argument name clash in strict mode\");\n      }\n    }\n\n    return finishNode(node, isStatement ? \"FunctionDeclaration\" : \"FunctionExpression\");\n  }\n\n  // Parses a comma-separated list of expressions, and returns them as\n  // an array. `close` is the token type that ends the list, and\n  // `allowEmpty` can be turned on to allow subsequent commas with\n  // nothing in between them to be parsed as `null` (which is needed\n  // for array literals).\n\n  function parseExprList(close, allowTrailingComma, allowEmpty) {\n    var elts = [], first = true;\n    while (!eat(close)) {\n      if (!first) {\n        expect(_comma);\n        if (allowTrailingComma && options.allowTrailingCommas && eat(close)) break;\n      } else first = false;\n\n      if (allowEmpty && tokType === _comma) elts.push(null);\n      else elts.push(parseExpression(true));\n    }\n    return elts;\n  }\n\n  // Parse the next token as an identifier. If `liberal` is true (used\n  // when parsing properties), it will also convert keywords into\n  // identifiers.\n\n  function parseIdent(liberal) {\n    var node = startNode();\n    node.name = tokType === _name ? tokVal : (liberal && !options.forbidReserved && tokType.keyword) || unexpected();\n    tokRegexpAllowed = false;\n    next();\n    return finishNode(node, \"Identifier\");\n  }\n\n});\n\n\n\n// WEBPACK FOOTER //\n// ./lib/acorn.js","module.exports = function(module) {\r\n\tif(!module.webpackPolyfill) {\r\n\t\tmodule.deprecate = function() {};\r\n\t\tmodule.paths = [];\r\n\t\t// module.parent = undefined by default\r\n\t\tif(!module.children) module.children = [];\r\n\t\tObject.defineProperty(module, \"loaded\", {\r\n\t\t\tenumerable: true,\r\n\t\t\tget: function() {\r\n\t\t\t\treturn module.l;\r\n\t\t\t}\r\n\t\t});\r\n\t\tObject.defineProperty(module, \"id\", {\r\n\t\t\tenumerable: true,\r\n\t\t\tget: function() {\r\n\t\t\t\treturn module.i;\r\n\t\t\t}\r\n\t\t});\r\n\t\tmodule.webpackPolyfill = 1;\r\n\t}\r\n\treturn module;\r\n};\r\n\n\n\n//////////////////\n// WEBPACK FOOTER\n// (webpack)/buildin/module.js\n// module id = 3\n// module chunks = 0","/// <reference path=\"./_estree.d.ts\" />\n\n// Declare missing functions\ndeclare function escape(s:string): string;\ndeclare function unescape(s:string): string;\n\n/**\n * @license\n * JavaScript Interpreter\n *\n * Copyright 2013-2017 Google Inc. and Jun Kato\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\n/**\n * @fileoverview Interpreting JavaScript in JavaScript.\n * @author fraser@google.com (Neil Fraser)\n * @author i@junkato.jp (Jun Kato)\n */\n\n/**\n * Create a new interpreter.\n * @param {string|!Object} code Raw JavaScript text or AST.\n * @param {Function=} opt_initFunc Optional initialization function.  Used to\n *     define APIs.  When called it is passed the interpreter object and the\n *     global scope object.\n * @constructor\n */\nclass Interpreter {\npublic static acorn: Interpreter.Acorn;\n\nprivate nodeConstructor: Interpreter.NodeConstructor;\npublic ast: ESTree.Program;\npublic global: Interpreter.MyObject;\npublic stateStack: Interpreter.MyState[];\npublic value: Interpreter.MyValue;\nprivate initFunc_: (i: Interpreter, scope: Interpreter.MyObject) => void;\nprivate paused_: boolean;\nprivate polyfills_: string[];\nprivate functionCounter_: number;\nprivate stepFunctions_: { [key: string]: Function };\n\npublic OBJECT: Interpreter.MyObject;\npublic OBJECT_PROTO: Interpreter.MyObject;\npublic FUNCTION: Interpreter.MyObject;\npublic FUNCTION_PROTO: Interpreter.MyObject;\npublic ARRAY: Interpreter.MyObject;\npublic ARRAY_PROTO: Interpreter.MyObject;\npublic REGEXP: Interpreter.MyObject;\npublic REGEXP_PROTO: Interpreter.MyObject;\n\npublic ERROR: Interpreter.MyObject;\npublic EVAL_ERROR: Interpreter.MyObject;\npublic RANGE_ERROR: Interpreter.MyObject;\npublic REFERENCE_ERROR: Interpreter.MyObject;\npublic SYNTAX_ERROR: Interpreter.MyObject;\npublic TYPE_ERROR: Interpreter.MyObject;\npublic URI_ERROR: Interpreter.MyObject;\n\npublic STRING: Interpreter.MyObject;\npublic BOOLEAN: Interpreter.MyObject;\npublic NUMBER: Interpreter.MyObject;\npublic DATE: Interpreter.MyObject;\n\n// The following properties are obsolete.  Do not use.\npublic UNDEFINED: Interpreter.MyObject;\npublic NULL: null;\npublic NAN: number;\npublic TRUE: boolean;\npublic FALSE: boolean;\npublic STRING_EMPTY: string;\npublic NUMBER_ZERO: number;\npublic NUMBER_ONE: number;\n\nconstructor(code: string | ESTree.Program\n    , opt_initFunc?: (i: Interpreter, scope: Interpreter.MyObject) => void) {\n  if (typeof code === 'string') {\n    code = Interpreter.acorn.parse(code, Interpreter.PARSE_OPTIONS);\n  }\n  this.ast = code;\n  this.initFunc_ = opt_initFunc;\n  this.paused_ = false;\n  this.polyfills_ = [];\n  // Unique identifier for native functions.  Used in serialization.\n  this.functionCounter_ = 0;\n  // Map node types to our step function names; a property lookup is faster\n  // than string concatenation with \"step\" prefix.\n  this.stepFunctions_ = Object.create(null);\n  var stepMatch = /^step([A-Z]\\w*)$/;\n  var m;\n  var props = Object.getOwnPropertyNames(Interpreter.prototype);\n  for (var i = 0; i < props.length; i ++) {\n    var methodName = props[i];\n    if ((typeof Interpreter.prototype[methodName] === 'function') &&\n        (m = methodName.match(stepMatch))) {\n      this.stepFunctions_[m[1]] = (<Function>Interpreter.prototype[methodName]).bind(this);\n    }\n  }\n  // Create and initialize the global scope.\n  this.global = this.createScope(this.ast, null);\n  // Run the polyfills.\n  this.ast = Interpreter.acorn.parse(this.polyfills_.join('\\n'), Interpreter.PARSE_OPTIONS);\n  this.polyfills_ = undefined;  // Allow polyfill strings to garbage collect.\n  this.stripLocations_(this.ast, undefined, undefined);\n  var state = new Interpreter.MyState(this.ast, this.global);\n  state.done = false;\n  this.stateStack = [state];\n  this.run();\n  this.value = undefined;\n  // Point at the main program.\n  this.ast = code;\n  var state = new Interpreter.MyState(this.ast, this.global);\n  state.done = false;\n  this.stateStack.length = 0;\n  this.stateStack[0] = state;\n  // Get a handle on Acorn's node_t object.  It's tricky to access.\n  this.nodeConstructor = <Interpreter.NodeConstructor>state.node.constructor;\n  // Preserve publicly properties from being pruned/renamed by JS compilers.\n  // Add others as needed.\n  this['stateStack'] = this.stateStack;\n  this['OBJECT'] = this.OBJECT; this['OBJECT_PROTO'] = this.OBJECT_PROTO;\n  this['FUNCTION'] = this.FUNCTION; this['FUNCTION_PROTO'] = this.FUNCTION_PROTO;\n  this['ARRAY'] = this.ARRAY; this['ARRAY_PROTO'] = this.ARRAY_PROTO;\n  this['REGEXP'] = this.REGEXP; this['REGEXP_PROTO'] = this.REGEXP_PROTO;\n  // The following properties are obsolete.  Do not use.\n  this['UNDEFINED'] = undefined; this['NULL'] = null; this['NAN'] = NaN;\n  this['TRUE'] = true; this['FALSE'] = false; this['STRING_EMPTY'] = '';\n  this['NUMBER_ZERO'] = 0; this['NUMBER_ONE'] = 1;\n};\n\n/**\n * @const {!Object} Configuration used for all Acorn parsing.\n */\nstatic PARSE_OPTIONS = {\n  ecmaVersion: 5\n};\n\n/**\n * Property descriptor of readonly properties.\n */\nstatic READONLY_DESCRIPTOR: Interpreter.MyDescriptor = {\n  configurable: true,\n  enumerable: true,\n  writable: false\n};\n\n/**\n * Property descriptor of non-enumerable properties.\n */\nstatic NONENUMERABLE_DESCRIPTOR: Interpreter.MyDescriptor = {\n  configurable: true,\n  enumerable: false,\n  writable: true\n};\n\n/**\n * Property descriptor of readonly, non-enumerable properties.\n */\nstatic READONLY_NONENUMERABLE_DESCRIPTOR: Interpreter.MyDescriptor = {\n  configurable: true,\n  enumerable: false,\n  writable: false\n};\n\n/**\n * Property descriptor of variables.\n */\nstatic VARIABLE_DESCRIPTOR: Interpreter.MyDescriptor = {\n  configurable: false,\n  enumerable: true,\n  writable: true\n};\n\n/**\n * Unique symbol for indicating that a step has encountered an error, has\n * added it to the stack, and will be thrown within the user's program.\n * When STEP_ERROR is thrown in the JS-Interpreter, the error can be ignored.\n */\nstatic STEP_ERROR = {};\n\n/**\n * Unique symbol for indicating that a reference is a variable on the scope,\n * not an object property.\n */\nstatic SCOPE_REFERENCE = {};\n\n/**\n * For cycle detection in array to string and error conversion;\n * see spec bug github.com/tc39/ecma262/issues/289\n * Since this is for atomic actions only, it can be a class property.\n */\nstatic toStringCycles_ = [];\n\n/**\n * Add more code to the interpreter.\n * @param {string|!Object} code Raw JavaScript text or AST.\n */\npublic appendCode(code: string | ESTree.Node) {\n  var state = this.stateStack[0];\n  if (!state || state.node['type'] !== 'Program') {\n    throw Error('Expecting original AST to start with a Program node.');\n  }\n  if (typeof code === 'string') {\n    code = Interpreter.acorn.parse(code, Interpreter.PARSE_OPTIONS);\n  }\n  if (!code || code['type'] !== 'Program') {\n    throw Error('Expecting new AST to start with a Program node.');\n  }\n  this.populateScope_(code, state.scope);\n  // Append the new program to the old one.\n  for (var i = 0, node; (node = code['body'][i]); i++) {\n    state.node['body'].push(node);\n  }\n  state.done = false;\n};\n\n/**\n * Execute one step of the interpreter.\n * @return {boolean} True if a step was executed, false if no more instructions.\n */\npublic step(): boolean {\n  var stack = this.stateStack;\n  var state = stack[stack.length - 1];\n  if (!state) {\n    return false;\n  }\n  var node = state.node, type = node['type'];\n  if (type === 'Program' && state.done) {\n    return false;\n  } else if (this.paused_) {\n    return true;\n  }\n  try {\n    var nextState = this.stepFunctions_[type](stack, state, node);\n  } catch (e) {\n    // Eat any step errors.  They have been thrown on the stack.\n    if (e !== Interpreter.STEP_ERROR) {\n      // Uh oh.  This is a real error in the JS-Interpreter.  Rethrow.\n      throw e;\n    }\n  }\n  if (nextState) {\n    stack.push(nextState);\n  }\n  if (!node['end']) {\n    // This is polyfill code.  Keep executing until we arrive at user code.\n    return this.step();\n  }\n  return true;\n};\n\n/**\n * Execute the interpreter to program completion.  Vulnerable to infinite loops.\n * @return {boolean} True if a execution is asynchronously blocked,\n *     false if no more instructions.\n */\npublic run() {\n  while (!this.paused_ && this.step()) {}\n  return this.paused_;\n};\n\n/**\n * Initialize the global scope with buitin properties and functions.\n * @param {!Interpreter.MyObject} scope Global scope.\n */\npublic initGlobalScope(scope: Interpreter.MyObject) {\n  // Initialize uneditable global properties.\n  this.setProperty(scope, 'NaN', NaN,\n                   Interpreter.READONLY_DESCRIPTOR);\n  this.setProperty(scope, 'Infinity', Infinity,\n                   Interpreter.READONLY_DESCRIPTOR);\n  this.setProperty(scope, 'undefined', undefined,\n                   Interpreter.READONLY_DESCRIPTOR);\n  this.setProperty(scope, 'window', scope,\n                   Interpreter.READONLY_DESCRIPTOR);\n  this.setProperty(scope, 'this', scope,\n                   Interpreter.READONLY_DESCRIPTOR);\n  this.setProperty(scope, 'self', scope); // Editable.\n\n  // Create the objects which will become Object.prototype and\n  // Function.prototype, which are needed to bootstrap everything else.\n  this.OBJECT_PROTO = new Interpreter.MyObject(null);\n  this.FUNCTION_PROTO = new Interpreter.MyObject(this.OBJECT_PROTO);\n  // Initialize global objects.\n  this.initFunction(scope);\n  this.initObject(scope);\n  // Unable to set scope's parent prior (OBJECT did not exist).\n  // Note that in a browser this would be 'Window', whereas in Node.js it would\n  // be 'Object'.  This interpreter is closer to Node in that it has no DOM.\n  scope.proto = this.OBJECT_PROTO;\n  this.setProperty(scope, 'constructor', this.OBJECT);\n  this.initArray(scope);\n  this.initString(scope);\n  this.initBoolean(scope);\n  this.initNumber(scope);\n  this.initDate(scope);\n  this.initRegExp(scope);\n  this.initError(scope);\n  this.initMath(scope);\n  this.initJSON(scope);\n\n  // Initialize global functions.\n  var thisInterpreter = this;\n  var func = this.createNativeFunction(\n      function(x) {throw EvalError(\"Can't happen\");}, false);\n  func.eval = true;\n  this.setProperty(scope, 'eval', func);\n\n  this.setProperty(scope, 'parseInt',\n      this.createNativeFunction(parseInt, false));\n  this.setProperty(scope, 'parseFloat',\n      this.createNativeFunction(parseFloat, false));\n\n  this.setProperty(scope, 'isNaN',\n      this.createNativeFunction(isNaN, false));\n\n  this.setProperty(scope, 'isFinite',\n      this.createNativeFunction(isFinite, false));\n\n  var strFunctions: any[] = [\n    [escape, 'escape'], [unescape, 'unescape'],\n    [decodeURI, 'decodeURI'], [decodeURIComponent, 'decodeURIComponent'],\n    [encodeURI, 'encodeURI'], [encodeURIComponent, 'encodeURIComponent']\n  ];\n  for (var i = 0; i < strFunctions.length; i++) {\n    var wrapper = (function(nativeFunc: (s: string) => string) {\n      return function(str) {\n        try {\n          return nativeFunc(str);\n        } catch (e) {\n          // decodeURI('%xy') will throw an error.  Catch and rethrow.\n          thisInterpreter.throwException(thisInterpreter.URI_ERROR, e.message);\n        }\n      };\n    })(strFunctions[i][0]);\n    this.setProperty(scope, strFunctions[i][1],\n        this.createNativeFunction(wrapper, false),\n        Interpreter.NONENUMERABLE_DESCRIPTOR);\n  }\n\n  // Run any user-provided initialization.\n  if (this.initFunc_) {\n    this.initFunc_(this, scope);\n  }\n};\n\n/**\n * Initialize the Function class.\n * @param {!Interpreter.MyObject} scope Global scope.\n */\npublic initFunction(scope: Interpreter.MyObject) {\n  var thisInterpreter = this;\n  var wrapper;\n  var identifierRegexp = /^[A-Za-z_$][\\w$]*$/;\n  // Function constructor.\n  wrapper = function(var_args) {\n    if (thisInterpreter.calledWithNew()) {\n      // Called as new Function().\n      var newFunc = <Interpreter.MyObject>this;\n    } else {\n      // Called as Function().\n      var newFunc =\n          thisInterpreter.createObjectProto(thisInterpreter.FUNCTION_PROTO);\n    }\n    if (arguments.length) {\n      var code = String(arguments[arguments.length - 1]);\n    } else {\n      var code = '';\n    }\n    var args: string[] | string = [];\n    for (var i = 0; i < arguments.length - 1; i++) {\n      var name = String(arguments[i]);\n      if (!name.match(identifierRegexp)) {\n        thisInterpreter.throwException(thisInterpreter.SYNTAX_ERROR,\n            'Invalid function argument: ' + name);\n      }\n      args.push(name);\n    }\n    args = args.join(', ');\n    // Interestingly, the scope for constructed functions is the global scope,\n    // even if they were constructed in some other scope.\n    newFunc.parentScope = thisInterpreter.global;\n    // Acorn needs to parse code in the context of a function or else 'return'\n    // statements will be syntax errors.\n    try {\n    var ast = Interpreter.acorn.parse('$ = function(' + args + ') {' + code + '};',\n        Interpreter.PARSE_OPTIONS);\n    } catch (e) {\n      // Acorn threw a SyntaxError.  Rethrow as a trappable error.\n      thisInterpreter.throwException(thisInterpreter.SYNTAX_ERROR,\n          'Invalid code: ' + e.message);\n    }\n    if (ast['body'].length !== 1) {\n      // Function('a', 'return a + 6;}; {alert(1);');\n      thisInterpreter.throwException(thisInterpreter.SYNTAX_ERROR,\n          'Invalid code in function body.');\n    }\n    newFunc.node = ast['body'][0]['expression']['right'];\n    thisInterpreter.setProperty(newFunc, 'length', newFunc.node['length'],\n        Interpreter.READONLY_DESCRIPTOR);\n    return newFunc;\n  };\n  wrapper.id = this.functionCounter_++;\n  this.FUNCTION = this.createObjectProto(this.FUNCTION_PROTO);\n\n  this.setProperty(scope, 'Function', this.FUNCTION);\n  // Manually setup type and prototype because createObj doesn't recognize\n  // this object as a function (this.FUNCTION did not exist).\n  this.setProperty(this.FUNCTION, 'prototype', this.FUNCTION_PROTO);\n  this.FUNCTION.nativeFunc = wrapper;\n\n  // Configure Function.prototype.\n  this.setProperty(this.FUNCTION_PROTO, 'constructor', this.FUNCTION,\n                   Interpreter.NONENUMERABLE_DESCRIPTOR);\n  this.FUNCTION_PROTO.nativeFunc = function() {};\n  this.FUNCTION_PROTO.nativeFunc.id = this.functionCounter_++;\n  this.setProperty(this.FUNCTION_PROTO, 'length', 0,\n      Interpreter.READONLY_DESCRIPTOR);\n\n  var boxThis = function(value) {\n    // In non-strict mode 'this' must be an object.\n    if ((!value || !value.isObject) && !thisInterpreter.getScope().strict) {\n      if (value === undefined || value === null) {\n        // 'Undefined' and 'null' are changed to global object.\n        value = thisInterpreter.global;\n      } else {\n        // Primitives must be boxed in non-strict mode.\n        var box = thisInterpreter.createObjectProto(\n            thisInterpreter.getPrototype(value));\n        box.data = value;\n        value = box;\n      }\n    }\n    return value;\n  };\n\n  wrapper = function(thisArg, args) {\n    var state =\n        thisInterpreter.stateStack[thisInterpreter.stateStack.length - 1];\n    // Rewrite the current 'CallExpression' to apply a different function.\n    state.func_ = this;\n    // Assign the 'this' object.\n    state.funcThis_ = boxThis(thisArg);\n    // Bind any provided arguments.\n    state.arguments_ = [];\n    if (args !== null && args !== undefined) {\n      if (args.isObject) {\n        state.arguments_ = thisInterpreter.pseudoToNative(args);\n      } else {\n        thisInterpreter.throwException(thisInterpreter.TYPE_ERROR,\n            'CreateListFromArrayLike called on non-object');\n      }\n    }\n    state.doneExec_ = false;\n  };\n  this.setNativeFunctionPrototype(this.FUNCTION, 'apply', wrapper);\n\n  wrapper = function(thisArg, var_args) {\n    var state =\n        thisInterpreter.stateStack[thisInterpreter.stateStack.length - 1];\n    // Rewrite the current 'CallExpression' to call a different function.\n    state.func_ = this;\n    // Assign the 'this' object.\n    state.funcThis_ = boxThis(thisArg);\n    // Bind any provided arguments.\n    state.arguments_ = [];\n    for (var i = 1; i < arguments.length; i++) {\n      state.arguments_.push(arguments[i]);\n    }\n    state.doneExec_ = false;\n  };\n  this.setNativeFunctionPrototype(this.FUNCTION, 'call', wrapper);\n\n  this.polyfills_.push(\n// Polyfill copied from:\n// developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_objects/Function/bind\n\"Object.defineProperty(Function.prototype, 'bind',\",\n    \"{configurable: true, writable: true, value:\",\n  \"function(oThis) {\",\n    \"if (typeof this !== 'function') {\",\n      \"throw TypeError('What is trying to be bound is not callable');\",\n    \"}\",\n    \"var aArgs   = Array.prototype.slice.call(arguments, 1),\",\n        \"fToBind = this,\",\n        \"fNOP    = function() {},\",\n        \"fBound  = function() {\",\n          \"return fToBind.apply(this instanceof fNOP\",\n                 \"? this\",\n                 \": oThis,\",\n                 \"aArgs.concat(Array.prototype.slice.call(arguments)));\",\n        \"};\",\n    \"if (this.prototype) {\",\n      \"fNOP.prototype = this.prototype;\",\n    \"}\",\n    \"fBound.prototype = new fNOP();\",\n    \"return fBound;\",\n  \"}\",\n\"});\",\n\"\");\n\n  // Function has no parent to inherit from, so it needs its own mandatory\n  // toString and valueOf functions.\n  wrapper = function() {\n    return this.toString();\n  };\n  this.setNativeFunctionPrototype(this.FUNCTION, 'toString', wrapper);\n  this.setProperty(this.FUNCTION, 'toString',\n      this.createNativeFunction(wrapper, false),\n      Interpreter.NONENUMERABLE_DESCRIPTOR);\n  wrapper = function() {\n    return this.valueOf();\n  };\n  this.setNativeFunctionPrototype(this.FUNCTION, 'valueOf', wrapper);\n  this.setProperty(this.FUNCTION, 'valueOf',\n      this.createNativeFunction(wrapper, false),\n      Interpreter.NONENUMERABLE_DESCRIPTOR);\n};\n\n/**\n * Initialize the Object class.\n * @param {!Interpreter.MyObject} scope Global scope.\n */\npublic initObject(scope: Interpreter.MyObject) {\n  var thisInterpreter = this;\n  var wrapper;\n  // Object constructor.\n  wrapper = function(value) {\n    if (value === undefined || value === null) {\n      // Create a new object.\n      if (thisInterpreter.calledWithNew()) {\n        // Called as new Object().\n        return this;\n      } else {\n        // Called as Object().\n        return thisInterpreter.createObjectProto(thisInterpreter.OBJECT_PROTO);\n      }\n    }\n    if (!value.isObject) {\n      // Wrap the value as an object.\n      var box = thisInterpreter.createObjectProto(\n          thisInterpreter.getPrototype(value));\n      box.data = value;\n      return box;\n    }\n    // Return the provided object.\n    return value;\n  };\n  this.OBJECT = this.createNativeFunction(wrapper, true);\n  // Throw away the created prototype and use the root prototype.\n  this.setProperty(this.OBJECT, 'prototype', this.OBJECT_PROTO);\n  this.setProperty(this.OBJECT_PROTO, 'constructor', this.OBJECT);\n  this.setProperty(scope, 'Object', this.OBJECT);\n\n  /**\n   * Checks if the provided value is null or undefined.\n   * If so, then throw an error in the call stack.\n   * @param {Interpreter.MyValue} value Value to check.\n   */\n  var throwIfNullUndefined = function(value) {\n    if (value === undefined || value === null) {\n      thisInterpreter.throwException(thisInterpreter.TYPE_ERROR,\n          \"Cannot convert '\" + value + \"' to object\");\n    }\n  };\n\n  // Static methods on Object.\n  wrapper = function(obj) {\n    throwIfNullUndefined(obj);\n    var props = obj.isObject ? obj.properties : obj;\n    return thisInterpreter.nativeToPseudo(Object.getOwnPropertyNames(props));\n  };\n  this.setProperty(this.OBJECT, 'getOwnPropertyNames',\n      this.createNativeFunction(wrapper, false),\n      Interpreter.NONENUMERABLE_DESCRIPTOR);\n\n  wrapper = function(obj) {\n    throwIfNullUndefined(obj);\n    if (!obj.isObject) {\n      return thisInterpreter.nativeToPseudo(Object.keys(obj));\n    }\n    return thisInterpreter.nativeToPseudo(Object.keys(obj.properties));\n  };\n  this.setProperty(this.OBJECT, 'keys',\n      this.createNativeFunction(wrapper, false),\n      Interpreter.NONENUMERABLE_DESCRIPTOR);\n\n  wrapper = function(proto) {\n    // Support for the second argument is the responsibility of a polyfill.\n    if (proto === null) {\n      return thisInterpreter.createObjectProto(null);\n    }\n    if (proto === undefined || !proto.isObject) {\n      thisInterpreter.throwException(thisInterpreter.TYPE_ERROR,\n          'Object prototype may only be an Object or null');\n    }\n    return thisInterpreter.createObjectProto(proto);\n  };\n  this.setProperty(this.OBJECT, 'create',\n      this.createNativeFunction(wrapper, false),\n      Interpreter.NONENUMERABLE_DESCRIPTOR);\n\n  // Add a polyfill to handle create's second argument.\n  this.polyfills_.push(\n\"(function() {\",\n  \"var create_ = Object.create;\",\n  \"Object.create = function(proto, props) {\",\n    \"var obj = create_(proto);\",\n    \"props && Object.defineProperties(obj, props);\",\n    \"return obj;\",\n  \"};\",\n\"})();\",\n\"\");\n\n  wrapper = function(obj, prop, descriptor) {\n    prop = String(prop);\n    if (!obj || !obj.isObject) {\n      thisInterpreter.throwException(thisInterpreter.TYPE_ERROR,\n          'Object.defineProperty called on non-object');\n    }\n    if (!descriptor || !descriptor.isObject) {\n      thisInterpreter.throwException(thisInterpreter.TYPE_ERROR,\n          'Property description must be an object');\n    }\n    if (!obj.properties[prop] && obj.preventExtensions) {\n      thisInterpreter.throwException(thisInterpreter.TYPE_ERROR,\n          \"Can't define property '\" + prop + \"', object is not extensible\");\n    }\n    // The polyfill guarantees no inheritance and no getter functions.\n    // Therefore the descriptor properties map is the native object needed.\n    thisInterpreter.setProperty(obj, prop, ReferenceError,\n                                descriptor.properties);\n    return obj;\n  };\n  this.setProperty(this.OBJECT, 'defineProperty',\n      this.createNativeFunction(wrapper, false),\n      Interpreter.NONENUMERABLE_DESCRIPTOR);\n\n  this.polyfills_.push(\n// Flatten the descriptor to remove any inheritance or getter functions.\n\"(function() {\",\n  \"var defineProperty_ = Object.defineProperty;\",\n  \"Object.defineProperty = function(obj, prop, d1) {\",\n    \"var d2 = {};\",\n    \"if ('configurable' in d1) d2.configurable = d1.configurable;\",\n    \"if ('enumerable' in d1) d2.enumerable = d1.enumerable;\",\n    \"if ('writable' in d1) d2.writable = d1.writable;\",\n    \"if ('value' in d1) d2.value = d1.value;\",\n    \"if ('get' in d1) d2.get = d1.get;\",\n    \"if ('set' in d1) d2.set = d1.set;\",\n    \"return defineProperty_(obj, prop, d2);\",\n  \"};\",\n\"})();\",\n\n\"Object.defineProperty(Object, 'defineProperties',\",\n    \"{configurable: true, writable: true, value:\",\n  \"function(obj, props) {\",\n    \"var keys = Object.keys(props);\",\n    \"for (var i = 0; i < keys.length; i++) {\",\n      \"Object.defineProperty(obj, keys[i], props[keys[i]]);\",\n    \"}\",\n    \"return obj;\",\n  \"}\",\n\"});\",\n\"\");\n\n  wrapper = function(obj, prop) {\n    if (!obj || !obj.isObject) {\n      thisInterpreter.throwException(thisInterpreter.TYPE_ERROR,\n          'Object.getOwnPropertyDescriptor called on non-object');\n    }\n    prop = String(prop);\n    if (!(prop in obj.properties)) {\n      return undefined;\n    }\n    var descriptor = Object.getOwnPropertyDescriptor(obj.properties, prop);\n    var getter = obj.getter[prop];\n    var setter = obj.setter[prop];\n\n    if (getter || setter) {\n      descriptor.get = getter;\n      descriptor.set = setter;\n      delete descriptor.value;\n      delete descriptor.writable;\n    }\n    var pseudoDescriptor = <Interpreter.MyObject>thisInterpreter.nativeToPseudo(descriptor);\n    if ('value' in descriptor) {\n      thisInterpreter.setProperty(pseudoDescriptor, 'value', descriptor.value);\n    }\n    return pseudoDescriptor;\n  };\n  this.setProperty(this.OBJECT, 'getOwnPropertyDescriptor',\n      this.createNativeFunction(wrapper, false),\n      Interpreter.NONENUMERABLE_DESCRIPTOR);\n\n  wrapper = function(obj) {\n    throwIfNullUndefined(obj);\n    return thisInterpreter.getPrototype(obj);\n  };\n  this.setProperty(this.OBJECT, 'getPrototypeOf',\n      this.createNativeFunction(wrapper, false),\n      Interpreter.NONENUMERABLE_DESCRIPTOR);\n\n  wrapper = function(obj) {\n    return Boolean(obj) && !obj.preventExtensions;\n  };\n  this.setProperty(this.OBJECT, 'isExtensible',\n      this.createNativeFunction(wrapper, false),\n      Interpreter.NONENUMERABLE_DESCRIPTOR);\n\n  wrapper = function(obj) {\n    if (obj && obj.isObject) {\n      obj.preventExtensions = true;\n    }\n    return obj;\n  };\n  this.setProperty(this.OBJECT, 'preventExtensions',\n      this.createNativeFunction(wrapper, false),\n      Interpreter.NONENUMERABLE_DESCRIPTOR);\n\n  // Instance methods on Object.\n  this.setNativeFunctionPrototype(this.OBJECT, 'toString',\n      Interpreter.MyObject.prototype.toString);\n  this.setNativeFunctionPrototype(this.OBJECT, 'toLocaleString',\n      Interpreter.MyObject.prototype.toString);\n  this.setNativeFunctionPrototype(this.OBJECT, 'valueOf',\n      Interpreter.MyObject.prototype.valueOf);\n\n  wrapper = function(prop) {\n    throwIfNullUndefined(this);\n    if (!this.isObject) {\n      return this.hasOwnProperty(prop);\n    }\n    return String(prop) in this.properties;\n  };\n  this.setNativeFunctionPrototype(this.OBJECT, 'hasOwnProperty', wrapper);\n\n  wrapper = function(prop) {\n    throwIfNullUndefined(this);\n    return Object.prototype.propertyIsEnumerable.call(this.properties, prop);\n  };\n  this.setNativeFunctionPrototype(this.OBJECT, 'propertyIsEnumerable', wrapper);\n\n  wrapper = function(obj) {\n    while (true) {\n      // Note, circular loops shouldn't be possible.\n      obj = thisInterpreter.getPrototype(obj);\n      if (!obj) {\n        // No parent; reached the top.\n        return false;\n      }\n      if (obj === this) {\n        return true;\n      }\n    }\n  };\n  this.setNativeFunctionPrototype(this.OBJECT, 'isPrototypeOf',  wrapper);\n};\n\n/**\n * Initialize the Array class.\n * @param {!Interpreter.MyObject} scope Global scope.\n */\npublic initArray(scope: Interpreter.MyObject) {\n  var thisInterpreter = this;\n  var getInt = function(obj, def) {\n    // Return an integer, or the default.\n    var n = obj ? Math.floor(obj) : def;\n    if (isNaN(n)) {\n      n = def;\n    }\n    return n;\n  };\n  var wrapper;\n  // Array constructor.\n  wrapper = function(var_args) {\n    if (thisInterpreter.calledWithNew()) {\n      // Called as new Array().\n      var newArray = <Interpreter.MyObject>this;\n    } else {\n      // Called as Array().\n      var newArray =\n          thisInterpreter.createObjectProto(thisInterpreter.ARRAY_PROTO);\n    }\n    var first = arguments[0];\n    if (arguments.length === 1 && typeof first === 'number') {\n      if (isNaN(Interpreter.legalArrayLength(first))) {\n        thisInterpreter.throwException(thisInterpreter.RANGE_ERROR,\n                                       'Invalid array length');\n      }\n      newArray.properties.length = first;\n    } else {\n      for (var i = 0; i < arguments.length; i++) {\n        newArray.properties[i] = arguments[i];\n      }\n      newArray.properties.length = i;\n    }\n    return newArray;\n  };\n  this.ARRAY = this.createNativeFunction(wrapper, true);\n  this.ARRAY_PROTO = this.ARRAY.properties['prototype'];\n  this.setProperty(scope, 'Array', this.ARRAY);\n\n  // Static methods on Array.\n  wrapper = function(obj) {\n    return obj && obj.class === 'Array';\n  };\n  this.setProperty(this.ARRAY, 'isArray',\n                   this.createNativeFunction(wrapper, false),\n                   Interpreter.NONENUMERABLE_DESCRIPTOR);\n\n  // Instance methods on Array.\n  wrapper = function() {\n    return Array.prototype.pop.call(this.properties);\n  };\n  this.setNativeFunctionPrototype(this.ARRAY, 'pop', wrapper);\n\n  wrapper = function(var_args) {\n    return Array.prototype.push.apply(this.properties, arguments);\n  };\n  this.setNativeFunctionPrototype(this.ARRAY, 'push', wrapper);\n\n  wrapper = function() {\n    return Array.prototype.shift.call(this.properties);\n  };\n  this.setNativeFunctionPrototype(this.ARRAY, 'shift', wrapper);\n\n  wrapper = function(var_args) {\n    return Array.prototype.unshift.apply(this.properties, arguments);\n  };\n  this.setNativeFunctionPrototype(this.ARRAY, 'unshift', wrapper);\n\n  wrapper = function() {\n    Array.prototype.reverse.call(this.properties);\n    return this;\n  };\n  this.setNativeFunctionPrototype(this.ARRAY, 'reverse', wrapper);\n\n  wrapper = function(index, howmany /*, var_args*/) {\n    var list = Array.prototype.splice.apply(this.properties, arguments);\n    return thisInterpreter.nativeToPseudo(list);\n  };\n  this.setNativeFunctionPrototype(this.ARRAY, 'splice', wrapper);\n\n  wrapper = function(opt_begin, opt_end) {\n    var list = Array.prototype.slice.call(this.properties, opt_begin, opt_end);\n    return thisInterpreter.nativeToPseudo(list);\n  };\n  this.setNativeFunctionPrototype(this.ARRAY, 'slice', wrapper);\n\n  wrapper = function(opt_separator) {\n    return Array.prototype.join.call(this.properties, opt_separator);\n  };\n  this.setNativeFunctionPrototype(this.ARRAY, 'join', wrapper);\n\n  wrapper = function(var_args) {\n    var list = [];\n    var length = 0;\n    // Start by copying the current array.\n    var iLength = thisInterpreter.getProperty(this, 'length');\n    for (var i = 0; i < iLength; i++) {\n      if (thisInterpreter.hasProperty(this, i)) {\n        var element = thisInterpreter.getProperty(this, i);\n        list[length] = element;\n      }\n      length++;\n    }\n    // Loop through all arguments and copy them in.\n    for (var i = 0; i < arguments.length; i++) {\n      var value = arguments[i];\n      if (thisInterpreter.isa(value, thisInterpreter.ARRAY)) {\n        var jLength = thisInterpreter.getProperty(value, 'length');\n        for (var j = 0; j < jLength; j++) {\n          if (thisInterpreter.hasProperty(value, j)) {\n            list[length] = thisInterpreter.getProperty(value, j);\n          }\n          length++;\n        }\n      } else {\n        list[length] = value;\n      }\n    }\n    return thisInterpreter.nativeToPseudo(list);\n  };\n  this.setNativeFunctionPrototype(this.ARRAY, 'concat', wrapper);\n\n  wrapper = function(searchElement, opt_fromIndex) {\n    return Array.prototype.indexOf.apply(this.properties, arguments);\n  };\n  this.setNativeFunctionPrototype(this.ARRAY, 'indexOf', wrapper);\n\n  wrapper = function(searchElement, opt_fromIndex) {\n    return Array.prototype.lastIndexOf.apply(this.properties, arguments);\n  };\n  this.setNativeFunctionPrototype(this.ARRAY, 'lastIndexOf', wrapper);\n\n  wrapper = function() {\n    Array.prototype.sort.call(this.properties);\n    return this;\n  };\n  this.setNativeFunctionPrototype(this.ARRAY, 'sort', wrapper);\n\n  this.polyfills_.push(\n// Polyfill copied from:\n// developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Array/every\n\"Object.defineProperty(Array.prototype, 'every',\",\n    \"{configurable: true, writable: true, value:\",\n  \"function(callbackfn, thisArg) {\",\n    \"if (!this || typeof callbackfn !== 'function') throw TypeError();\",\n    \"var T, k;\",\n    \"var O = Object(this);\",\n    \"var len = O.length >>> 0;\",\n    \"if (arguments.length > 1) T = thisArg;\",\n    \"k = 0;\",\n    \"while (k < len) {\",\n      \"if (k in O && !callbackfn.call(T, O[k], k, O)) return false;\",\n      \"k++;\",\n    \"}\",\n    \"return true;\",\n  \"}\",\n\"});\",\n\n// Polyfill copied from:\n// developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Array/filter\n\"Object.defineProperty(Array.prototype, 'filter',\",\n    \"{configurable: true, writable: true, value:\",\n  \"function(fun/*, thisArg*/) {\",\n    \"if (this === void 0 || this === null || typeof fun !== 'function') throw TypeError();\",\n    \"var t = Object(this);\",\n    \"var len = t.length >>> 0;\",\n    \"var res = [];\",\n    \"var thisArg = arguments.length >= 2 ? arguments[1] : void 0;\",\n    \"for (var i = 0; i < len; i++) {\",\n      \"if (i in t) {\",\n        \"var val = t[i];\",\n        \"if (fun.call(thisArg, val, i, t)) res.push(val);\",\n      \"}\",\n    \"}\",\n    \"return res;\",\n  \"}\",\n\"});\",\n\n// Polyfill copied from:\n// developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Array/forEach\n\"Object.defineProperty(Array.prototype, 'forEach',\",\n    \"{configurable: true, writable: true, value:\",\n  \"function(callback, thisArg) {\",\n    \"if (!this || typeof callback !== 'function') throw TypeError();\",\n    \"var T, k;\",\n    \"var O = Object(this);\",\n    \"var len = O.length >>> 0;\",\n    \"if (arguments.length > 1) T = thisArg;\",\n    \"k = 0;\",\n    \"while (k < len) {\",\n      \"if (k in O) callback.call(T, O[k], k, O);\",\n      \"k++;\",\n    \"}\",\n  \"}\",\n\"});\",\n\n// Polyfill copied from:\n// developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Array/map\n\"Object.defineProperty(Array.prototype, 'map',\",\n    \"{configurable: true, writable: true, value:\",\n  \"function(callback, thisArg) {\",\n    \"if (!this || typeof callback !== 'function') new TypeError;\",\n    \"var T, A, k;\",\n    \"var O = Object(this);\",\n    \"var len = O.length >>> 0;\",\n    \"if (arguments.length > 1) T = thisArg;\",\n    \"A = new Array(len);\",\n    \"k = 0;\",\n    \"while (k < len) {\",\n      \"if (k in O) A[k] = callback.call(T, O[k], k, O);\",\n      \"k++;\",\n    \"}\",\n    \"return A;\",\n  \"}\",\n\"});\",\n\n// Polyfill copied from:\n// developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Array/Reduce\n\"Object.defineProperty(Array.prototype, 'reduce',\",\n    \"{configurable: true, writable: true, value:\",\n  \"function(callback /*, initialValue*/) {\",\n    \"if (!this || typeof callback !== 'function') throw TypeError();\",\n    \"var t = Object(this), len = t.length >>> 0, k = 0, value;\",\n    \"if (arguments.length === 2) {\",\n      \"value = arguments[1];\",\n    \"} else {\",\n      \"while (k < len && !(k in t)) k++;\",\n      \"if (k >= len) {\",\n        \"throw TypeError('Reduce of empty array with no initial value');\",\n      \"}\",\n      \"value = t[k++];\",\n    \"}\",\n    \"for (; k < len; k++) {\",\n      \"if (k in t) value = callback(value, t[k], k, t);\",\n    \"}\",\n    \"return value;\",\n  \"}\",\n\"});\",\n\n// Polyfill copied from:\n// developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Array/ReduceRight\n\"Object.defineProperty(Array.prototype, 'reduceRight',\",\n    \"{configurable: true, writable: true, value:\",\n  \"function(callback /*, initialValue*/) {\",\n    \"if (null === this || 'undefined' === typeof this || 'function' !== typeof callback) throw TypeError();\",\n    \"var t = Object(this), len = t.length >>> 0, k = len - 1, value;\",\n    \"if (arguments.length >= 2) {\",\n      \"value = arguments[1];\",\n    \"} else {\",\n      \"while (k >= 0 && !(k in t)) k--;\",\n      \"if (k < 0) {\",\n        \"throw TypeError('Reduce of empty array with no initial value');\",\n      \"}\",\n      \"value = t[k--];\",\n    \"}\",\n    \"for (; k >= 0; k--) {\",\n      \"if (k in t) value = callback(value, t[k], k, t);\",\n    \"}\",\n    \"return value;\",\n  \"}\",\n\"});\",\n\n// Polyfill copied from:\n// developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Array/some\n\"Object.defineProperty(Array.prototype, 'some',\",\n    \"{configurable: true, writable: true, value:\",\n  \"function(fun/*, thisArg*/) {\",\n    \"if (!this || typeof fun !== 'function') throw TypeError();\",\n    \"var t = Object(this);\",\n    \"var len = t.length >>> 0;\",\n    \"var thisArg = arguments.length >= 2 ? arguments[1] : void 0;\",\n    \"for (var i = 0; i < len; i++) {\",\n      \"if (i in t && fun.call(thisArg, t[i], i, t)) {\",\n        \"return true;\",\n      \"}\",\n    \"}\",\n    \"return false;\",\n  \"}\",\n\"});\",\n\n\n\"(function() {\",\n  \"var sort_ = Array.prototype.sort;\",\n  \"Array.prototype.sort = function(opt_comp) {\",\n    // Fast native sort.\n    \"if (typeof opt_comp !== 'function') {\",\n      \"return sort_.call(this);\",\n    \"}\",\n    // Slow bubble sort.\n    \"for (var i = 0; i < this.length; i++) {\",\n      \"var changes = 0;\",\n      \"for (var j = 0; j < this.length - i - 1; j++) {\",\n        \"if (opt_comp(this[j], this[j + 1]) > 0) {\",\n          \"var swap = this[j];\",\n          \"this[j] = this[j + 1];\",\n          \"this[j + 1] = swap;\",\n          \"changes++;\",\n        \"}\",\n      \"}\",\n      \"if (!changes) break;\",\n    \"}\",\n    \"return this;\",\n  \"};\",\n\"})();\",\n\n\"Object.defineProperty(Array.prototype, 'toLocaleString',\",\n    \"{configurable: true, writable: true, value:\",\n  \"function() {\",\n    \"var out = [];\",\n    \"for (var i = 0; i < this.length; i++) {\",\n      \"out[i] = (this[i] === null || this[i] === undefined) ? '' : this[i].toLocaleString();\",\n    \"}\",\n    \"return out.join(',');\",\n  \"}\",\n\"});\",\n\"\");\n};\n\n/**\n * Initialize the String class.\n * @param {!Interpreter.MyObject} scope Global scope.\n */\npublic initString(scope: Interpreter.MyObject) {\n  var thisInterpreter = this;\n  var wrapper;\n  // String constructor.\n  wrapper = function(value) {\n    value = String(value);\n    if (thisInterpreter.calledWithNew()) {\n      // Called as new String().\n      this.data = value;\n      return this;\n    } else {\n      // Called as String().\n      return value;\n    }\n  };\n  this.STRING = this.createNativeFunction(wrapper, true);\n  this.setProperty(scope, 'String', this.STRING);\n\n  // Static methods on String.\n  this.setProperty(this.STRING, 'fromCharCode',\n      this.createNativeFunction(String.fromCharCode, false),\n      Interpreter.NONENUMERABLE_DESCRIPTOR);\n\n  // Instance methods on String.\n  // Methods with exclusively primitive arguments.\n  var functions = ['trim', 'toLowerCase', 'toUpperCase',\n      'toLocaleLowerCase', 'toLocaleUpperCase', 'charAt', 'charCodeAt',\n      'substring', 'slice', 'substr', 'indexOf', 'lastIndexOf', 'concat'];\n  for (var i = 0; i < functions.length; i++) {\n    this.setNativeFunctionPrototype(this.STRING, functions[i],\n                                    String.prototype[functions[i]]);\n  }\n\n  wrapper = function(compareString, locales, options) {\n    locales = locales ? thisInterpreter.pseudoToNative(locales) : undefined;\n    options = options ? thisInterpreter.pseudoToNative(options) : undefined;\n    return String(this).localeCompare(compareString, locales, options);\n  };\n  this.setNativeFunctionPrototype(this.STRING, 'localeCompare', wrapper);\n\n  wrapper = function(separator, limit) {\n    if (thisInterpreter.isa(separator, thisInterpreter.REGEXP)) {\n      separator = separator.data;\n    }\n    var jsList = String(this).split(separator, limit);\n    return thisInterpreter.nativeToPseudo(jsList);\n  };\n  this.setNativeFunctionPrototype(this.STRING, 'split', wrapper);\n\n  wrapper = function(regexp) {\n    regexp = regexp ? regexp.data : undefined;\n    var match = String(this).match(regexp);\n    if (!match) {\n      return null;\n    }\n    return thisInterpreter.nativeToPseudo(match);\n  };\n  this.setNativeFunctionPrototype(this.STRING, 'match', wrapper);\n\n  wrapper = function(regexp) {\n    if (thisInterpreter.isa(regexp, thisInterpreter.REGEXP)) {\n      regexp = regexp.data;\n    }\n    return String(this).search(regexp);\n  };\n  this.setNativeFunctionPrototype(this.STRING, 'search', wrapper);\n\n  wrapper = function(substr, newSubstr) {\n    // Support for function replacements is the responsibility of a polyfill.\n    return String(this).replace(substr.data || substr, newSubstr);\n  };\n  this.setNativeFunctionPrototype(this.STRING, 'replace', wrapper);\n  // Add a polyfill to handle replace's second argument being a function.\n  this.polyfills_.push(\n\"(function() {\",\n  \"var replace_ = String.prototype.replace;\",\n  \"String.prototype.replace = function(substr, newSubstr) {\",\n    \"if (typeof newSubstr !== 'function') {\",\n      // string.replace(string|regexp, string)\n      \"return replace_.call(this, substr, newSubstr);\",\n    \"}\",\n    \"var str = this;\",\n    \"if (substr instanceof RegExp) {\",  // string.replace(regexp, function)\n      \"var subs = [];\",\n      \"var m = substr.exec(str);\",\n      \"while (m) {\",\n        \"m.push(m.index, str);\",\n        \"var inject = newSubstr.apply(null, m);\",\n        \"subs.push([m.index, m[0].length, inject]);\",\n        \"m = substr.global ? substr.exec(str) : null;\",\n      \"}\",\n      \"for (var i = subs.length - 1; i >= 0; i--) {\",\n        \"str = str.substring(0, subs[i][0]) + subs[i][2] + \" +\n            \"str.substring(subs[i][0] + subs[i][1]);\",\n      \"}\",\n    \"} else {\",                         // string.replace(string, function)\n      \"var i = str.indexOf(substr);\",\n      \"if (i !== -1) {\",\n        \"var inject = newSubstr(str.substr(i, substr.length), i, str);\",\n        \"str = str.substring(0, i) + inject + \" +\n            \"str.substring(i + substr.length);\",\n      \"}\",\n    \"}\",\n    \"return str;\",\n  \"};\",\n\"})();\",\n\"\");\n};\n\n/**\n * Initialize the Boolean class.\n * @param {!Interpreter.MyObject} scope Global scope.\n */\npublic initBoolean(scope: Interpreter.MyObject) {\n  var thisInterpreter = this;\n  var wrapper;\n  // Boolean constructor.\n  wrapper = function(value) {\n    value = Boolean(value);\n    if (thisInterpreter.calledWithNew()) {\n      // Called as new Boolean().\n      this.data = value;\n      return this;\n    } else {\n      // Called as Boolean().\n      return value;\n    }\n  };\n  this.BOOLEAN = this.createNativeFunction(wrapper, true);\n  this.setProperty(scope, 'Boolean', this.BOOLEAN);\n};\n\n/**\n * Initialize the Number class.\n * @param {!Interpreter.MyObject} scope Global scope.\n */\npublic initNumber(scope: Interpreter.MyObject) {\n  var thisInterpreter = this;\n  var wrapper;\n  // Number constructor.\n  wrapper = function(value) {\n    value = Number(value);\n    if (thisInterpreter.calledWithNew()) {\n      // Called as new Number().\n      this.data = value;\n      return this;\n    } else {\n      // Called as Number().\n      return value;\n    }\n  };\n  this.NUMBER = this.createNativeFunction(wrapper, true);\n  this.setProperty(scope, 'Number', this.NUMBER);\n\n  var numConsts = ['MAX_VALUE', 'MIN_VALUE', 'NaN', 'NEGATIVE_INFINITY',\n                   'POSITIVE_INFINITY'];\n  for (var i = 0; i < numConsts.length; i++) {\n    this.setProperty(this.NUMBER, numConsts[i], Number[numConsts[i]],\n        Interpreter.READONLY_NONENUMERABLE_DESCRIPTOR);\n  }\n\n  // Instance methods on Number.\n  wrapper = function(fractionDigits) {\n    try {\n      return Number(this).toExponential(fractionDigits);\n    } catch (e) {\n      // Throws if fractionDigits isn't within 0-20.\n      thisInterpreter.throwException(thisInterpreter.ERROR, e.message);\n    }\n  };\n  this.setNativeFunctionPrototype(this.NUMBER, 'toExponential', wrapper);\n\n  wrapper = function(digits) {\n    try {\n      return Number(this).toFixed(digits);\n    } catch (e) {\n      // Throws if digits isn't within 0-20.\n      thisInterpreter.throwException(thisInterpreter.ERROR, e.message);\n    }\n  };\n  this.setNativeFunctionPrototype(this.NUMBER, 'toFixed', wrapper);\n\n  wrapper = function(precision) {\n    try {\n      return Number(this).toPrecision(precision);\n    } catch (e) {\n      // Throws if precision isn't within range (depends on implementation).\n      thisInterpreter.throwException(thisInterpreter.ERROR, e.message);\n    }\n  };\n  this.setNativeFunctionPrototype(this.NUMBER, 'toPrecision', wrapper);\n\n  wrapper = function(radix) {\n    try {\n      return Number(this).toString(radix);\n    } catch (e) {\n      // Throws if radix isn't within 2-36.\n      thisInterpreter.throwException(thisInterpreter.ERROR, e.message);\n    }\n  };\n  this.setNativeFunctionPrototype(this.NUMBER, 'toString', wrapper);\n\n  wrapper = function(locales, options) {\n    locales = locales ? thisInterpreter.pseudoToNative(locales) : undefined;\n    options = options ? thisInterpreter.pseudoToNative(options) : undefined;\n    return Number(this).toLocaleString(locales, options);\n  };\n  this.setNativeFunctionPrototype(this.NUMBER, 'toLocaleString', wrapper);\n};\n\n/**\n * Initialize the Date class.\n * @param {!Interpreter.MyObject} scope Global scope.\n */\npublic initDate(scope: Interpreter.MyObject) {\n  var thisInterpreter = this;\n  var wrapper;\n  // Date constructor.\n  wrapper = function(value, var_args) {\n    if (!thisInterpreter.calledWithNew()) {\n      // Called as Date().\n      // Calling Date() as a function returns a string, no arguments are heeded.\n      return Date();\n    }\n    // Called as new Date().\n    var args = [null].concat([].slice.call(arguments));\n    this.data = new (Function.prototype.bind.apply(Date, args));\n    return this;\n  };\n  this.DATE = this.createNativeFunction(wrapper, true);\n  this.setProperty(scope, 'Date', this.DATE);\n\n  // Static methods on Date.\n  this.setProperty(this.DATE, 'now', this.createNativeFunction(Date.now, false),\n      Interpreter.NONENUMERABLE_DESCRIPTOR);\n\n  this.setProperty(this.DATE, 'parse',\n      this.createNativeFunction(Date.parse, false),\n      Interpreter.NONENUMERABLE_DESCRIPTOR);\n\n  this.setProperty(this.DATE, 'UTC', this.createNativeFunction(Date.UTC, false),\n      Interpreter.NONENUMERABLE_DESCRIPTOR);\n\n  // Instance methods on Date.\n  var functions = ['getDate', 'getDay', 'getFullYear', 'getHours',\n      'getMilliseconds', 'getMinutes', 'getMonth', 'getSeconds', 'getTime',\n      'getTimezoneOffset', 'getUTCDate', 'getUTCDay', 'getUTCFullYear',\n      'getUTCHours', 'getUTCMilliseconds', 'getUTCMinutes', 'getUTCMonth',\n      'getUTCSeconds', 'getYear',\n      'setDate', 'setFullYear', 'setHours', 'setMilliseconds',\n      'setMinutes', 'setMonth', 'setSeconds', 'setTime', 'setUTCDate',\n      'setUTCFullYear', 'setUTCHours', 'setUTCMilliseconds', 'setUTCMinutes',\n      'setUTCMonth', 'setUTCSeconds', 'setYear',\n      'toDateString', 'toISOString', 'toJSON', 'toGMTString',\n      'toLocaleDateString', 'toLocaleString', 'toLocaleTimeString',\n      'toTimeString', 'toUTCString'];\n  for (var i = 0; i < functions.length; i++) {\n    wrapper = (function(nativeFunc) {\n      return function(var_args) {\n        var args = [];\n        for (var i = 0; i < arguments.length; i++) {\n          args[i] = thisInterpreter.pseudoToNative(arguments[i]);\n        }\n        return this.data[nativeFunc].apply(this.data, args);\n      };\n    })(functions[i]);\n    this.setNativeFunctionPrototype(this.DATE, functions[i], wrapper);\n  }\n};\n\n/**\n * Initialize Regular Expression object.\n * @param {!Interpreter.MyObject} scope Global scope.\n */\npublic initRegExp(scope: Interpreter.MyObject) {\n  var thisInterpreter = this;\n  var wrapper;\n  // RegExp constructor.\n  wrapper = function(pattern, flags) {\n    if (thisInterpreter.calledWithNew()) {\n      // Called as new RegExp().\n      var rgx = <Interpreter.MyObject>this;\n    } else {\n      // Called as RegExp().\n      var rgx = thisInterpreter.createObjectProto(thisInterpreter.REGEXP_PROTO);\n    }\n    pattern = pattern ? pattern.toString() : '';\n    flags = flags ? flags.toString() : '';\n    thisInterpreter.populateRegExp(rgx, new RegExp(pattern, flags));\n    return rgx;\n  };\n  this.REGEXP = this.createNativeFunction(wrapper, true);\n  this.REGEXP_PROTO = this.REGEXP.properties['prototype'];\n  this.setProperty(scope, 'RegExp', this.REGEXP);\n\n  this.setProperty(this.REGEXP.properties['prototype'], 'global', undefined,\n      Interpreter.READONLY_NONENUMERABLE_DESCRIPTOR);\n  this.setProperty(this.REGEXP.properties['prototype'], 'ignoreCase', undefined,\n      Interpreter.READONLY_NONENUMERABLE_DESCRIPTOR);\n  this.setProperty(this.REGEXP.properties['prototype'], 'multiline', undefined,\n      Interpreter.READONLY_NONENUMERABLE_DESCRIPTOR);\n  this.setProperty(this.REGEXP.properties['prototype'], 'source', '(?:)',\n      Interpreter.READONLY_NONENUMERABLE_DESCRIPTOR);\n\n  wrapper = function(str) {\n    return this.data.test(str);\n  };\n  this.setNativeFunctionPrototype(this.REGEXP, 'test', wrapper);\n\n  wrapper = function(str) {\n    str = str.toString();\n    // Get lastIndex from wrapped regex, since this is settable.\n    this.data.lastIndex =\n        Number(thisInterpreter.getProperty(this, 'lastIndex'));\n    var match = this.data.exec(str);\n    thisInterpreter.setProperty(this, 'lastIndex', this.data.lastIndex);\n\n    if (match) {\n      var result =\n          thisInterpreter.createObjectProto(thisInterpreter.ARRAY_PROTO);\n      for (var i = 0; i < match.length; i++) {\n        thisInterpreter.setProperty(result, i, match[i]);\n      }\n      // match has additional properties.\n      thisInterpreter.setProperty(result, 'index', match.index);\n      thisInterpreter.setProperty(result, 'input', match.input);\n      return result;\n    }\n    return null;\n  };\n  this.setNativeFunctionPrototype(this.REGEXP, 'exec', wrapper);\n};\n\n/**\n * Initialize the Error class.\n * @param {!Interpreter.MyObject} scope Global scope.\n */\npublic initError(scope: Interpreter.MyObject) {\n  var thisInterpreter = this;\n  // Error constructor.\n  this.ERROR = this.createNativeFunction(function(opt_message) {\n    if (thisInterpreter.calledWithNew()) {\n      // Called as new Error().\n      var newError = <Interpreter.MyObject>this;\n    } else {\n      // Called as Error().\n      var newError = thisInterpreter.createObject(thisInterpreter.ERROR);\n    }\n    if (opt_message) {\n      thisInterpreter.setProperty(newError, 'message', String(opt_message),\n          Interpreter.NONENUMERABLE_DESCRIPTOR);\n    }\n    return newError;\n  }, true);\n  this.setProperty(scope, 'Error', this.ERROR);\n  this.setProperty(this.ERROR.properties['prototype'], 'message', '',\n      Interpreter.NONENUMERABLE_DESCRIPTOR);\n  this.setProperty(this.ERROR.properties['prototype'], 'name', 'Error',\n      Interpreter.NONENUMERABLE_DESCRIPTOR);\n\n  var createErrorSubclass = function(name) {\n    var constructor = thisInterpreter.createNativeFunction(\n        function(opt_message) {\n          if (thisInterpreter.calledWithNew()) {\n            // Called as new XyzError().\n            var newError = <Interpreter.MyObject>this;\n          } else {\n            // Called as XyzError().\n            var newError = thisInterpreter.createObject(constructor);\n          }\n          if (opt_message) {\n            thisInterpreter.setProperty(newError, 'message',\n                String(opt_message), Interpreter.NONENUMERABLE_DESCRIPTOR);\n          }\n          return newError;\n        }, true);\n    thisInterpreter.setProperty(constructor, 'prototype',\n        thisInterpreter.createObject(thisInterpreter.ERROR));\n    thisInterpreter.setProperty(constructor.properties['prototype'], 'name',\n        name, Interpreter.NONENUMERABLE_DESCRIPTOR);\n    thisInterpreter.setProperty(scope, name, constructor);\n\n    return constructor;\n  };\n\n  this.EVAL_ERROR = createErrorSubclass('EvalError');\n  this.RANGE_ERROR = createErrorSubclass('RangeError');\n  this.REFERENCE_ERROR = createErrorSubclass('ReferenceError');\n  this.SYNTAX_ERROR = createErrorSubclass('SyntaxError');\n  this.TYPE_ERROR = createErrorSubclass('TypeError');\n  this.URI_ERROR = createErrorSubclass('URIError');\n};\n\n/**\n * Initialize Math object.\n * @param {!Interpreter.MyObject} scope Global scope.\n */\npublic initMath(scope: Interpreter.MyObject) {\n  var thisInterpreter = this;\n  var myMath = this.createObjectProto(this.OBJECT_PROTO);\n  this.setProperty(scope, 'Math', myMath);\n  var mathConsts = ['E', 'LN2', 'LN10', 'LOG2E', 'LOG10E', 'PI',\n                    'SQRT1_2', 'SQRT2'];\n  for (var i = 0; i < mathConsts.length; i++) {\n    this.setProperty(myMath, mathConsts[i], Math[mathConsts[i]],\n        Interpreter.READONLY_NONENUMERABLE_DESCRIPTOR);\n  }\n  var numFunctions = ['abs', 'acos', 'asin', 'atan', 'atan2', 'ceil', 'cos',\n                      'exp', 'floor', 'log', 'max', 'min', 'pow', 'random',\n                      'round', 'sin', 'sqrt', 'tan'];\n  for (var i = 0; i < numFunctions.length; i++) {\n    this.setProperty(myMath, numFunctions[i],\n        this.createNativeFunction(Math[numFunctions[i]], false),\n        Interpreter.NONENUMERABLE_DESCRIPTOR);\n  }\n};\n\n/**\n * Initialize JSON object.\n * @param {!Interpreter.MyObject} scope Global scope.\n */\npublic initJSON(scope: Interpreter.MyObject) {\n  var thisInterpreter = this;\n  var myJSON = thisInterpreter.createObjectProto(this.OBJECT_PROTO);\n  this.setProperty(scope, 'JSON', myJSON);\n\n  var wrapper = function(text) {\n    try {\n      var nativeObj = JSON.parse(text.toString());\n    } catch (e) {\n      thisInterpreter.throwException(thisInterpreter.SYNTAX_ERROR, e.message);\n    }\n    return thisInterpreter.nativeToPseudo(nativeObj);\n  };\n  this.setProperty(myJSON, 'parse', this.createNativeFunction(wrapper, false));\n\n  wrapper = function(value) {\n    var nativeObj = thisInterpreter.pseudoToNative(value);\n    try {\n      var str = JSON.stringify(nativeObj);\n    } catch (e) {\n      thisInterpreter.throwException(thisInterpreter.TYPE_ERROR, e.message);\n    }\n    return str;\n  };\n  this.setProperty(myJSON, 'stringify',\n      this.createNativeFunction(wrapper, false));\n};\n\n/**\n * Is an object of a certain class?\n * @param {Interpreter.MyValue} child Object to check.\n * @param {Interpreter.MyObject} constructor Constructor of object.\n * @return {boolean} True if object is the class or inherits from it.\n *     False otherwise.\n */\npublic isa(child: Interpreter.MyValue, constructor: Interpreter.MyObject) {\n  if (child === null || child === undefined || !constructor) {\n    return false;\n  }\n  var proto = constructor.properties['prototype'];\n  if (child === proto) {\n    return true;\n  }\n  // The first step up the prototype chain is harder since the child might be\n  // a primitive value.  Subsequent steps can just follow the .proto property.\n  var childObj = this.getPrototype(child);\n  while (childObj) {\n    if (childObj === proto) {\n      return true;\n    }\n    childObj = childObj.proto;\n  }\n  return false;\n};\n\n/**\n * Is a value a legal integer for an array length?\n * @param {Interpreter.MyValue} x Value to check.\n * @return {number} Zero, or a positive integer if the value can be\n *     converted to such.  NaN otherwise.\n */\nstatic legalArrayLength(x: Interpreter.MyValue) {\n  var n = <number>x >>> 0;\n  // Array length must be between 0 and 2^32-1 (inclusive).\n  return (n === Number(x)) ? n : NaN;\n};\n\n/**\n * Is a value a legal integer for an array index?\n * @param {Interpreter.MyValue} x Value to check.\n * @return {number} Zero, or a positive integer if the value can be\n *     converted to such.  NaN otherwise.\n */\nstatic legalArrayIndex(x: Interpreter.MyValue) {\n  var n = <number>x >>> 0;\n  // Array index cannot be 2^32-1, otherwise length would be 2^32.\n  // 0xffffffff is 2^32-1.\n  return (String(n) === String(x) && n !== 0xffffffff) ? n : NaN;\n};\n\n/**\n * Create a new data object based on a constructor's prototype.\n * @param {Interpreter.MyObject} constructor Parent constructor function,\n *     or null if scope object.\n * @return {!Interpreter.MyObject} New data object.\n */\npublic createObject(constructor: Interpreter.MyObject) {\n  return this.createObjectProto(constructor &&\n                                constructor.properties['prototype']);\n};\n\n/**\n * Create a new data object based on a prototype.\n * @param {Interpreter.MyObject} proto Prototype object.\n * @return {!Interpreter.MyObject} New data object.\n */\npublic createObjectProto(proto: Interpreter.MyObject) {\n  var obj = new Interpreter.MyObject(proto);\n  // Functions have prototype objects.\n  if (this.isa(obj, this.FUNCTION)) {\n    this.setProperty(obj, 'prototype',\n                     this.createObjectProto(this.OBJECT_PROTO || null));\n    obj.class = 'Function';\n  }\n  // Arrays have length.\n  if (this.isa(obj, this.ARRAY)) {\n    this.setProperty(obj, 'length', 0,\n        {configurable: false, enumerable: false, writable: true});\n    obj.class = 'Array';\n  }\n  if (this.isa(obj, this.ERROR)) {\n    obj.class = 'Error';\n  }\n  return obj;\n};\n\n/**\n * Initialize a pseudo regular expression object based on a native regular\n * expression object.\n * @param {!Interpreter.MyObject} pseudoRegexp The existing object to set.\n * @param {!RegExp} nativeRegexp The native regular expression.\n */\npublic populateRegExp(pseudoRegexp: Interpreter.MyObject, nativeRegexp: RegExp) {\n  pseudoRegexp.data = nativeRegexp;\n  // lastIndex is settable, all others are read-only attributes\n  this.setProperty(pseudoRegexp, 'lastIndex', nativeRegexp.lastIndex,\n      Interpreter.NONENUMERABLE_DESCRIPTOR);\n  this.setProperty(pseudoRegexp, 'source', nativeRegexp.source,\n      Interpreter.READONLY_NONENUMERABLE_DESCRIPTOR);\n  this.setProperty(pseudoRegexp, 'global', nativeRegexp.global,\n      Interpreter.READONLY_NONENUMERABLE_DESCRIPTOR);\n  this.setProperty(pseudoRegexp, 'ignoreCase', nativeRegexp.ignoreCase,\n      Interpreter.READONLY_NONENUMERABLE_DESCRIPTOR);\n  this.setProperty(pseudoRegexp, 'multiline', nativeRegexp.multiline,\n      Interpreter.READONLY_NONENUMERABLE_DESCRIPTOR);\n};\n\n/**\n * Create a new function.\n * @param {!Object} node AST node defining the function.\n * @param {!Object} scope Parent scope.\n * @return {!Interpreter.MyObject} New function.\n */\npublic createFunction(node: ESTree.FunctionDeclaration, scope: Interpreter.MyObject) {\n  var func = this.createObjectProto(this.FUNCTION_PROTO);\n  func.parentScope = scope;\n  func.node = node;\n  this.setProperty(func, 'length', func.node['params'].length,\n      Interpreter.READONLY_DESCRIPTOR);\n  return func;\n};\n\n/**\n * Create a new native function.\n * @param {!Function} nativeFunc JavaScript function.\n * @param {boolean=} opt_constructor If true, the function's\n * prototype will have its constructor property set to the function.\n * If false, the function cannot be called as a constructor (e.g. escape).\n * Defaults to undefined.\n * @return {!Interpreter.MyObject} New function.\n */\npublic createNativeFunction(nativeFunc: Interpreter.NativeFunction, opt_constructor?: boolean) {\n  var func = this.createObjectProto(this.FUNCTION_PROTO);\n  func.nativeFunc = nativeFunc;\n  nativeFunc.id = this.functionCounter_++;\n  this.setProperty(func, 'length', nativeFunc.length,\n      Interpreter.READONLY_DESCRIPTOR);\n  if (opt_constructor) {\n    this.setProperty(func.properties['prototype'], 'constructor',\n        func, Interpreter.NONENUMERABLE_DESCRIPTOR);\n  } else if (opt_constructor === false) {\n    func.illegalConstructor = true;\n    this.setProperty(func, 'prototype', undefined);\n  }\n  return func;\n};\n\n/**\n * Create a new native asynchronous function.\n * @param {!Function} asyncFunc JavaScript function.\n * @return {!Interpreter.MyObject} New function.\n */\npublic createAsyncFunction(asyncFunc) {\n  var func = this.createObjectProto(this.FUNCTION_PROTO);\n  func.asyncFunc = asyncFunc;\n  asyncFunc.id = this.functionCounter_++;\n  this.setProperty(func, 'length', asyncFunc.length,\n      Interpreter.READONLY_DESCRIPTOR);\n  return func;\n};\n\n/**\n * Converts from a native JS object or value to a JS interpreter object.\n * Can handle JSON-style values.\n * @param {*} nativeObj The native JS object to be converted.\n * @return {Interpreter.MyValue} The equivalent JS interpreter object.\n */\npublic nativeToPseudo(nativeObj: any): Interpreter.MyValue {\n  if (typeof nativeObj === 'boolean' ||\n      typeof nativeObj === 'number' ||\n      typeof nativeObj === 'string' ||\n      nativeObj === null || nativeObj === undefined) {\n    return nativeObj;\n  }\n\n  if (nativeObj instanceof RegExp) {\n    var pseudoRegexp = this.createObjectProto(this.REGEXP_PROTO);\n    this.populateRegExp(pseudoRegexp, nativeObj);\n    return pseudoRegexp;\n  }\n\n  if (nativeObj instanceof Function) {\n    var interpreter = this;\n    var wrapper = function() {\n      return interpreter.nativeToPseudo(\n        nativeObj.apply(interpreter,\n          Array.prototype.slice.call(arguments)\n          .map(function(i) {\n            return interpreter.pseudoToNative(i);\n          })\n        )\n      );\n    };\n    return this.createNativeFunction(wrapper, undefined);\n  }\n\n  var pseudoObj: Interpreter.MyObject;\n  if (Array.isArray(nativeObj)) {  // Array.\n    pseudoObj = this.createObjectProto(this.ARRAY_PROTO);\n    for (var i = 0; i < nativeObj.length; i++) {\n      if (i in nativeObj) {\n        this.setProperty(pseudoObj, i, this.nativeToPseudo(nativeObj[i]));\n      }\n    }\n  } else {  // Object.\n    pseudoObj = this.createObjectProto(this.OBJECT_PROTO);\n    for (var key in nativeObj) {\n      this.setProperty(pseudoObj, key, this.nativeToPseudo(nativeObj[key]));\n    }\n  }\n  return pseudoObj;\n};\n\n/**\n * Converts from a JS interpreter object to native JS object.\n * Can handle JSON-style values, plus cycles.\n * @param {Interpreter.MyValue} pseudoObj The JS interpreter object to be\n * converted.\n * @param {Object=} opt_cycles Cycle detection (used in recursive calls).\n * @return {*} The equivalent native JS object or value.\n */\npublic pseudoToNative(pseudoObj: Interpreter.MyValue, opt_cycles?: Interpreter.MyValueTable) {\n  if (typeof pseudoObj === 'boolean' ||\n      typeof pseudoObj === 'number' ||\n      typeof pseudoObj === 'string' ||\n      pseudoObj === null || pseudoObj === undefined) {\n    return pseudoObj;\n  }\n\n  if (this.isa(pseudoObj, this.REGEXP)) {  // Regular expression.\n    return pseudoObj.data;\n  }\n\n  var cycles = opt_cycles || {\n    pseudo: [],\n    native: []\n  };\n  var i = cycles.pseudo.indexOf(pseudoObj);\n  if (i !== -1) {\n    return cycles.native[i];\n  }\n  cycles.pseudo.push(pseudoObj);\n  var nativeObj;\n  if (this.isa(pseudoObj, this.ARRAY)) {  // Array.\n    nativeObj = [];\n    cycles.native.push(nativeObj);\n    var length = this.getProperty(pseudoObj, 'length');\n    for (var i = 0; i < length; i++) {\n      if (this.hasProperty(pseudoObj, i)) {\n        nativeObj[i] =\n            this.pseudoToNative(this.getProperty(pseudoObj, i), cycles);\n      }\n    }\n  } else {  // Object.\n    nativeObj = {};\n    cycles.native.push(nativeObj);\n    var val;\n    for (var key in pseudoObj.properties) {\n      val = pseudoObj.properties[key];\n      nativeObj[key] = this.pseudoToNative(val, cycles);\n    }\n  }\n  cycles.pseudo.pop();\n  cycles.native.pop();\n  return nativeObj;\n};\n\n/**\n * Look up the prototype for this value.\n * @param {Interpreter.MyValue} value Data object.\n * @return {Interpreter.MyObject} Prototype object, null if none.\n */\npublic getPrototype(value: Interpreter.MyValue): Interpreter.MyObject {\n  switch (typeof value) {\n    case 'number':\n      return this.NUMBER.properties['prototype'];\n    case 'boolean':\n      return this.BOOLEAN.properties['prototype'];\n    case 'string':\n      return this.STRING.properties['prototype'];\n  }\n  if (value) {\n    return (<Interpreter.MyObject>value).proto;\n  }\n  return null;\n};\n\n/**\n * Fetch a property value from a data object.\n * @param {Interpreter.MyValue} obj Data object.\n * @param {Interpreter.MyValue} name Name of property.\n * @return {Interpreter.MyValue} Property value (may be undefined).\n */\npublic getProperty(obj: Interpreter.MyValue, name: Interpreter.MyValue): Interpreter.MyValue {\n  name = String(name);\n  if (obj === undefined || obj === null) {\n    this.throwException(this.TYPE_ERROR,\n                        \"Cannot read property '\" + name + \"' of \" + obj);\n  }\n  if (name === 'length') {\n    // Special cases for magic length property.\n    if (this.isa(obj, this.STRING)) {\n      return String(obj).length;\n    }\n  } else if (name.charCodeAt(0) < 0x40) {\n    // Might have numbers in there?\n    // Special cases for string array indexing\n    if (this.isa(obj, this.STRING)) {\n      var n = Interpreter.legalArrayIndex(name);\n      if (!isNaN(n) && n < String(obj).length) {\n        return String(obj)[n];\n      }\n    }\n  }\n  do {\n    const myObj = <Interpreter.MyObject>obj;\n    if (myObj.properties && name in myObj.properties) {\n      var getter = myObj.getter[name];\n      if (getter) {\n        // Flag this function as being a getter and thus needing immediate\n        // execution (rather than being the value of the property).\n        getter.isGetter = true;\n        return getter;\n      }\n      return myObj.properties[name];\n    }\n  } while ((obj = this.getPrototype(obj)));\n  return undefined;\n};\n\n/**\n * Does the named property exist on a data object.\n * @param {Interpreter.MyValue} obj Data object.\n * @param {Interpreter.MyValue} name Name of property.\n * @return {boolean} True if property exists.\n */\npublic hasProperty(obj: Interpreter.MyValue, name: Interpreter.MyValue) {\n  if (!obj['isObject']) {\n    throw TypeError('Primitive data type has no properties');\n  }\n  name = String(name);\n  if (name === 'length' && this.isa(obj, this.STRING)) {\n    return true;\n  }\n  if (this.isa(obj, this.STRING)) {\n    var n = Interpreter.legalArrayIndex(name);\n    if (!isNaN(n) && n < String(obj).length) {\n      return true;\n    }\n  }\n  do {\n    const myObj = <Interpreter.MyObject> obj;\n    if (myObj.properties && name in myObj.properties) {\n      return true;\n    }\n  } while ((obj = this.getPrototype(obj)));\n  return false;\n};\n\n/**\n * Set a property value on a data object.\n * @param {!Interpreter.MyObject} obj Data object.\n * @param {Interpreter.MyValue} name Name of property.\n * @param {Interpreter.MyValue|ReferenceError} value New property value.\n *   Use ReferenceError if value is handled by descriptor instead.\n * @param {Object=} opt_descriptor Optional descriptor object.\n * @return {!Interpreter.MyObject|undefined} Returns a setter function if one\n *     needs to be called, otherwise undefined.\n */\npublic setProperty(obj: Interpreter.MyObject, name: Interpreter.MyValue, value: Interpreter.MyValue | ReferenceErrorConstructor, opt_descriptor?): Interpreter.MyObject {\n  name = String(name);\n  if (obj === undefined || obj === null) {\n    this.throwException(this.TYPE_ERROR,\n                        \"Cannot set property '\" + name + \"' of \" + obj);\n  }\n  if (opt_descriptor && ('get' in opt_descriptor || 'set' in opt_descriptor) &&\n      ('value' in opt_descriptor || 'writable' in opt_descriptor)) {\n    this.throwException(this.TYPE_ERROR, 'Invalid property descriptor. ' +\n        'Cannot both specify accessors and a value or writable attribute');\n  }\n  var strict = !this.stateStack || this.getScope().strict;\n  if (!obj.isObject) {\n    if (strict) {\n      this.throwException(this.TYPE_ERROR, \"Can't create property '\" + name +\n                          \"' on '\" + obj + \"'\");\n    }\n    return;\n  }\n  if (this.isa(obj, this.STRING)) {\n    var n = Interpreter.legalArrayIndex(name);\n    if (name === 'length' || (!isNaN(n) && n < String(obj).length)) {\n      // Can't set length or letters on String objects.\n      if (strict) {\n        this.throwException(this.TYPE_ERROR, \"Cannot assign to read only \" +\n            \"property '\" + name + \"' of String '\" + obj.data + \"'\");\n      }\n      return;\n    }\n  }\n  if (obj.class === 'Array') {\n    // Arrays have a magic length variable that is bound to the elements.\n    var length = obj.properties.length;\n    var i;\n    if (name === 'length') {\n      // Delete elements if length is smaller.\n      value = Interpreter.legalArrayLength(<number>value);\n      if (isNaN(value)) {\n        this.throwException(this.RANGE_ERROR, 'Invalid array length');\n      }\n      if (value < length) {\n        for (i in obj.properties) {\n          i = Interpreter.legalArrayIndex(i);\n          if (!isNaN(i) && value <= i) {\n            delete obj.properties[i];\n          }\n        }\n      }\n    } else if (!isNaN(i = Interpreter.legalArrayIndex(name))) {\n      // Increase length if this index is larger.\n      obj.properties.length = Math.max(length, i + 1);\n    }\n  }\n  if (obj.preventExtensions && !(name in obj.properties)) {\n    if (strict) {\n      this.throwException(this.TYPE_ERROR, \"Can't add property '\" + name +\n                          \"', object is not extensible\");\n    }\n    return;\n  }\n  if (opt_descriptor) {\n    // Define the property.\n    if ('get' in opt_descriptor) {\n      if (opt_descriptor.get) {\n        obj.getter[name] = opt_descriptor.get;\n      } else {\n        delete obj.getter[name];\n      }\n    }\n    if ('set' in opt_descriptor) {\n      if (opt_descriptor.set) {\n        obj.setter[name] = opt_descriptor.set;\n      } else {\n        delete obj.setter[name];\n      }\n    }\n    var descriptor: Interpreter.MyDescriptor = {};\n    if ('configurable' in opt_descriptor) {\n      descriptor.configurable = opt_descriptor.configurable;\n    }\n    if ('enumerable' in opt_descriptor) {\n      descriptor.enumerable = opt_descriptor.enumerable;\n    }\n    if ('writable' in opt_descriptor) {\n      descriptor.writable = opt_descriptor.writable;\n      delete obj.getter[name];\n      delete obj.setter[name];\n    }\n    if ('value' in opt_descriptor) {\n      descriptor.value = opt_descriptor.value;\n      delete obj.getter[name];\n      delete obj.setter[name];\n    } else if (value !== ReferenceError) {\n      descriptor.value = value;\n      delete obj.getter[name];\n      delete obj.setter[name];\n    }\n    try {\n      Object.defineProperty(obj.properties, name, <any>descriptor);\n    } catch (e) {\n      this.throwException(this.TYPE_ERROR, 'Cannot redefine property: ' + name);\n    }\n  } else {\n    // Set the property.\n    if (value === ReferenceError) {\n      throw ReferenceError('Value not specified.');\n    }\n    // Determine the parent (possibly self) where the property is defined.\n    var defObj = obj;\n    while (!(name in defObj.properties)) {\n      defObj = this.getPrototype(defObj);\n      if (!defObj) {\n        // This is a new property.\n        defObj = obj;\n        break;\n      }\n    }\n    if (defObj.setter && defObj.setter[name]) {\n      return defObj.setter[name];\n    }\n    if (defObj.getter && defObj.getter[name]) {\n      if (strict) {\n        this.throwException(this.TYPE_ERROR, \"Cannot set property '\" + name +\n            \"' of object '\" + obj + \"' which only has a getter\");\n      }\n    } else {\n      // No setter, simple assignment.\n      try {\n        obj.properties[name] = value;\n      } catch (e) {\n        if (strict) {\n          this.throwException(this.TYPE_ERROR, \"Cannot assign to read only \" +\n              \"property '\" + name + \"' of object '\" + obj + \"'\");\n        }\n      }\n    }\n  }\n};\n\n/**\n * Convenience method for adding a native function as a non-enumerable property\n * onto an object's prototype.\n * @param {!Interpreter.MyObject} obj Data object.\n * @param {Interpreter.MyValue} name Name of property.\n * @param {!Function} wrapper Function object.\n */\nprivate setNativeFunctionPrototype(obj: Interpreter.MyObject, name: Interpreter.MyValue, wrapper: Function) {\n  this.setProperty(obj.properties['prototype'], name,\n      this.createNativeFunction(wrapper, false),\n      Interpreter.NONENUMERABLE_DESCRIPTOR);\n};\n\n/**\n * Returns the current scope from the stateStack.\n * @return {!Interpreter.MyObject} Current scope dictionary.\n */\npublic getScope() {\n  var scope = this.stateStack[this.stateStack.length - 1].scope;\n  if (!scope) {\n    throw Error('No scope found.');\n  }\n  return scope;\n};\n\n/**\n * Create a new scope dictionary.\n * @param {!Object} node AST node defining the scope container\n *     (e.g. a function).\n * @param {Interpreter.MyObject} parentScope Scope to link to.\n * @return {!Interpreter.MyObject} New scope.\n */\npublic createScope(node: ESTree.Node, parentScope: Interpreter.MyObject) {\n  var scope = this.createObjectProto(null);\n  scope.parentScope = parentScope;\n  if (!parentScope) {\n    this.initGlobalScope(scope);\n  }\n  this.populateScope_(node, scope);\n\n  // Determine if this scope starts with 'use strict'.\n  scope.strict = false;\n  if (parentScope && parentScope.strict) {\n    scope.strict = true;\n  } else {\n    var firstNode = node['body'] && node['body'][0];\n    if (firstNode && firstNode.expression &&\n        firstNode.expression['type'] === 'Literal' &&\n        firstNode.expression.value === 'use strict') {\n      scope.strict = true;\n    }\n  }\n  return scope;\n};\n\n/**\n * Create a new special scope dictionary. Similar to createScope(), but\n * doesn't assume that the scope is for a function body.\n * This is used for 'catch' clauses and 'with' statements.\n * @param {!Interpreter.MyObject} parentScope Scope to link to.\n * @param {Interpreter.MyObject=} opt_scope Optional object to transform into\n *     scope.\n * @return {!Interpreter.MyObject} New scope.\n */\npublic createSpecialScope(parentScope: Interpreter.MyObject, opt_scope?: Interpreter.MyObject) {\n  if (!parentScope) {\n    throw Error('parentScope required');\n  }\n  var scope = opt_scope || this.createObjectProto(null);\n  scope.parentScope = parentScope;\n  scope.strict = parentScope.strict;\n  return scope;\n};\n\n/**\n * Retrieves a value from the scope chain.\n * @param {string} name Name of variable.\n * @return {Interpreter.MyValue} Any value.\n *   May be flagged as being a getter and thus needing immediate execution\n *   (rather than being the value of the property).\n */\npublic getValueFromScope(name: string): Interpreter.MyValue {\n  var scope = this.getScope();\n  while (scope && scope !== this.global) {\n    if (name in scope.properties) {\n      return scope.properties[name];\n    }\n    scope = scope.parentScope;\n  }\n  // The root scope is also an object which has inherited properties and\n  // could also have getters.\n  if (scope === this.global && this.hasProperty(scope, name)) {\n    return this.getProperty(scope, name);\n  }\n  // Typeof operator is unique: it can safely look at non-defined variables.\n  var prevNode = this.stateStack[this.stateStack.length - 1].node;\n  if (prevNode['type'] === 'UnaryExpression' &&\n      prevNode['operator'] === 'typeof') {\n    return undefined;\n  }\n  this.throwException(this.REFERENCE_ERROR, name + ' is not defined');\n};\n\n/**\n * Sets a value to the current scope.\n * @param {string} name Name of variable.\n * @param {Interpreter.MyValue} value Value.\n * @return {!Interpreter.MyObject|undefined} Returns a setter function if one\n *     needs to be called, otherwise undefined.\n */\npublic setValueToScope(name: string, value: Interpreter.MyValue) {\n  var scope = this.getScope();\n  var strict = scope.strict;\n  while (scope && scope !== this.global) {\n    if (name in scope.properties) {\n      scope.properties[name] = value;\n      return undefined;\n    }\n    scope = scope.parentScope;\n  }\n  // The root scope is also an object which has readonly properties and\n  // could also have setters.\n  if (scope === this.global && (!strict || this.hasProperty(scope, name))) {\n    return this.setProperty(scope, name, value);\n  }\n  this.throwException(this.REFERENCE_ERROR, name + ' is not defined');\n};\n\n/**\n * Create a new scope for the given node.\n * @param {!Object} node AST node (program or function).\n * @param {!Interpreter.MyObject} scope Scope dictionary to populate.\n * @private\n */\npublic populateScope_(node: ESTree.Node, scope: Interpreter.MyObject) {\n  if (node['type'] === 'VariableDeclaration') {\n    for (var i = 0; i < node['declarations'].length; i++) {\n      this.setProperty(scope, node['declarations'][i]['id']['name'],\n          undefined, Interpreter.VARIABLE_DESCRIPTOR);\n    }\n  } else if (node['type'] === 'FunctionDeclaration') {\n    this.setProperty(scope, node['id']['name'],\n        this.createFunction(<ESTree.FunctionDeclaration>node, scope), Interpreter.VARIABLE_DESCRIPTOR);\n    return;  // Do not recurse into function.\n  } else if (node['type'] === 'FunctionExpression') {\n    return;  // Do not recurse into function.\n  } else if (node['type'] === 'ExpressionStatement') {\n    return;  // Expressions can't contain variable/function declarations.\n  }\n  var nodeClass = node['constructor'];\n  for (var name in node) {\n    var prop = node[name];\n    if (prop && typeof prop === 'object') {\n      if (Array.isArray(prop)) {\n        for (var i = 0; i < prop.length; i++) {\n          if (prop[i] && prop[i].constructor === nodeClass) {\n            this.populateScope_(prop[i], scope);\n          }\n        }\n      } else {\n        if (prop.constructor === nodeClass) {\n          this.populateScope_(prop, scope);\n        }\n      }\n    }\n  }\n};\n\n/**\n * Remove start and end values from AST, or set start and end values to a\n * constant value.  Used to remove highlighting from polyfills and to set\n * highlighting in an eval to cover the entire eval expression.\n * @param {!Object} node AST node.\n * @param {number=} start Starting character of all nodes, or undefined.\n * @param {number=} end Ending character of all nodes, or undefined.\n * @private\n */\nprivate stripLocations_(node: ESTree.BaseNode, start: number, end: number) {\n  if (start) {\n    node['start'] = start;\n  } else {\n    delete node['start'];\n  }\n  if (end) {\n    node['end'] = end;\n  } else {\n    delete node['end'];\n  }\n  for (var name in node) {\n    if (node.hasOwnProperty(name)) {\n      var prop = node[name];\n      if (prop && typeof prop === 'object') {\n        this.stripLocations_(prop, start, end);\n      }\n    }\n  }\n};\n\n/**\n * Is the current state directly being called with as a construction with 'new'.\n * @return {boolean} True if 'new foo()', false if 'foo()'.\n */\npublic calledWithNew(): boolean {\n  return this.stateStack[this.stateStack.length - 1].isConstructor;\n};\n\n/**\n * Gets a value from the scope chain or from an object property.\n * @param {!Array} ref Name of variable or object/propname tuple.\n * @return {Interpreter.MyValue} Any value.\n *   May be flagged as being a getter and thus needing immediate execution\n *   (rather than being the value of the property).\n */\npublic getValue(ref) {\n  if (ref[0] === Interpreter.SCOPE_REFERENCE) {\n    // A null/varname variable lookup.\n    return this.getValueFromScope(ref[1]);\n  } else {\n    // An obj/prop components tuple (foo.bar).\n    return this.getProperty(ref[0], ref[1]);\n  }\n};\n\n/**\n * Sets a value to the scope chain or to an object property.\n * @param {!Array} ref Name of variable or object/propname tuple.\n * @param {Interpreter.MyValue} value Value.\n * @return {!Interpreter.MyObject|undefined} Returns a setter function if one\n *     needs to be called, otherwise undefined.\n */\npublic setValue(ref: Array<any> & { 0: Interpreter.MyObject, 1: string }, value: Interpreter.MyValue) {\n  if (ref[0] === Interpreter.SCOPE_REFERENCE) {\n    // A null/varname variable lookup.\n    return this.setValueToScope(ref[1], value);\n  } else {\n    // An obj/prop components tuple (foo.bar).\n    return this.setProperty(ref[0], ref[1], value);\n  }\n};\n\n/**\n * Throw an exception in the interpreter that can be handled by an\n * interpreter try/catch statement.  If unhandled, a real exception will\n * be thrown.  Can be called with either an error class and a message, or\n * with an actual object to be thrown.\n * @param {!Interpreter.MyObject} errorClass Type of error (if message is\n *   provided) or the value to throw (if no message).\n * @param {string=} opt_message Message being thrown.\n */\npublic throwException(errorClass: Interpreter.MyObject, opt_message?: string) {\n  if (opt_message === undefined) {\n    var error = <Interpreter.MyObject>errorClass;  // This is a value to throw, not an error class.\n  } else {\n    var error = this.createObject(errorClass);\n    this.setProperty(error, 'message', opt_message,\n        Interpreter.NONENUMERABLE_DESCRIPTOR);\n  }\n  this.executeException(error);\n  // Abort anything related to the current step.\n  throw Interpreter.STEP_ERROR;\n};\n\n/**\n * Throw an exception in the interpreter that can be handled by a\n * interpreter try/catch statement.  If unhandled, a real exception will\n * be thrown.\n * @param {!Interpreter.MyObject} error Error object to execute.\n */\npublic executeException(error: Interpreter.MyObject) {\n  // Search for a try statement.\n  const stateStack = this.stateStack.slice();\n  do {\n    this.stateStack.pop();\n    var state = this.stateStack[this.stateStack.length - 1];\n    if (state.node['type'] === 'TryStatement') {\n      state.throwValue = error;\n      return;\n    }\n  } while (state && state.node['type'] !== 'Program');\n\n  // Throw a real error.\n  var realError;\n  if (this.isa(error, this.ERROR)) {\n    var errorTable = {\n      'EvalError': EvalError,\n      'RangeError': RangeError,\n      'ReferenceError': ReferenceError,\n      'SyntaxError': SyntaxError,\n      'TypeError': TypeError,\n      'URIError': URIError\n    };\n    var name = this.getProperty(error, 'name').toString();\n    var message = this.getProperty(error, 'message').valueOf();\n    var type = errorTable[name] || Error;\n    realError = type(message);\n  } else {\n    realError = String(error);\n  }\n  this.stateStack = stateStack; // recover the original state stack\n  throw realError;\n};\n\n/**\n * Create a call to a getter function.\n * @param {!Interpreter.MyObject} func Function to execute.\n * @param {!Interpreter.MyObject|!Array} left\n *     Name of variable or object/propname tuple.\n * @private\n */\npublic createGetter_(func: Interpreter.MyObject, left: Interpreter.MyObject | Array<Interpreter.MyObject>) {\n  // Normally 'this' will be specified as the object component (o.x).\n  // Sometimes 'this' is explicitly provided (o).\n  var funcThis = Array.isArray(left) ? left[0] : left;\n  var node = new this.nodeConstructor();\n  node['type'] = 'CallExpression';\n  var state = new Interpreter.MyState(node,\n      this.stateStack[this.stateStack.length - 1].scope);\n  state.doneCallee_ = true;\n  state.funcThis_ = funcThis;\n  state.func_ = func;\n  state.doneArgs_ = true;\n  state.arguments_ = [];\n  return state;\n};\n\n/**\n * Create a call to a setter function.\n * @param {!Interpreter.MyObject} func Function to execute.\n * @param {!Interpreter.MyObject|!Array} left\n *     Name of variable or object/propname tuple.\n * @param {Interpreter.MyValue} value Value to set.\n * @private\n */\npublic createSetter_(func: Interpreter.MyObject, left: Interpreter.MyObject | Array<Interpreter.MyObject>, value: Interpreter.MyValue) {\n  // Normally 'this' will be specified as the object component (o.x).\n  // Sometimes 'this' is implicitly the global object (x).\n  var funcThis = Array.isArray(left) ? left[0] : this.global;\n  var node = new this.nodeConstructor();\n  node['type'] = 'CallExpression';\n  var state = new Interpreter.MyState(node,\n      this.stateStack[this.stateStack.length - 1].scope);\n  state.doneCallee_ = true;\n  state.funcThis_ = funcThis;\n  state.func_ = func;\n  state.doneArgs_ = true;\n  state.arguments_ = [value];\n  return state;\n};\n\n\n///////////////////////////////////////////////////////////////////////////////\n// Functions to handle each node type.\n///////////////////////////////////////////////////////////////////////////////\n\nprivate stepArrayExpression(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  var elements = node['elements'];\n  var n = state.n_ || 0;\n  if (!state.array_) {\n    state.array_ = this.createObjectProto(this.ARRAY_PROTO);\n    state.array_.properties.length = elements.length;\n  } else {\n    this.setProperty(state.array_, n, state.value);\n    n++;\n  }\n  while (n < elements.length) {\n    // Skip missing elements - they're not defined, not undefined.\n    if (elements[n]) {\n      state.n_ = n;\n      return new Interpreter.MyState(elements[n], state.scope);\n    }\n    n++;\n  }\n  stack.pop();\n  stack[stack.length - 1].value = state.array_;\n};\n\nprivate stepAssignmentExpression(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  if (!state.doneLeft_) {\n    state.doneLeft_ = true;\n    var nextState = new Interpreter.MyState(node['left'], state.scope);\n    nextState.components = true;\n    return nextState;\n  }\n  if (!state.doneRight_) {\n    if (!state.leftReference_) {\n      state.leftReference_ = state.value;\n    }\n    if (state.doneGetter_) {\n      state.leftValue_ = state.value;\n    }\n    if (!state.doneGetter_ && node['operator'] !== '=') {\n      var leftValue = this.getValue(state.leftReference_);\n      state.leftValue_ = leftValue;\n      if (leftValue && typeof leftValue === 'object' && leftValue.isGetter) {\n        // Clear the getter flag and call the getter function.\n        leftValue.isGetter = false;\n        state.doneGetter_ = true;\n        var func = /** @type {!Interpreter.Object} */ (leftValue);\n        return this.createGetter_(func, state.leftReference_);\n      }\n    }\n    state.doneRight_ = true;\n    return new Interpreter.MyState(node['right'], state.scope);\n  }\n  if (state.doneSetter_) {\n    // Return if setter function.\n    // Setter method on property has completed.\n    // Ignore its return value, and use the original set value instead.\n    stack.pop();\n    stack[stack.length - 1].value = state.doneSetter_;\n    return;\n  }\n  var value = state.leftValue_;\n  var rightValue = state.value;\n  switch (node['operator']) {\n    case '=':    value =    rightValue; break;\n    case '+=':   value +=   rightValue; break;\n    case '-=':   value -=   rightValue; break;\n    case '*=':   value *=   rightValue; break;\n    case '/=':   value /=   rightValue; break;\n    case '%=':   value %=   rightValue; break;\n    case '<<=':  value <<=  rightValue; break;\n    case '>>=':  value >>=  rightValue; break;\n    case '>>>=': value >>>= rightValue; break;\n    case '&=':   value &=   rightValue; break;\n    case '^=':   value ^=   rightValue; break;\n    case '|=':   value |=   rightValue; break;\n    default:\n      throw SyntaxError('Unknown assignment expression: ' + node['operator']);\n  }\n  var setter = this.setValue(state.leftReference_, value);\n  if (setter) {\n    state.doneSetter_ = value;\n    return this.createSetter_(setter, state.leftReference_, value);\n  }\n  // Return if no setter function.\n  stack.pop();\n  stack[stack.length - 1].value = value;\n};\n\nprivate stepBinaryExpression(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  if (!state.doneLeft_) {\n    state.doneLeft_ = true;\n    return new Interpreter.MyState(node['left'], state.scope);\n  }\n  if (!state.doneRight_) {\n    state.doneRight_ = true;\n    state.leftValue_ = state.value;\n    return new Interpreter.MyState(node['right'], state.scope);\n  }\n  stack.pop();\n  var leftValue = state.leftValue_;\n  var rightValue = state.value;\n  var value;\n  switch (node['operator']) {\n    case '==':  value = leftValue ==  rightValue; break;\n    case '!=':  value = leftValue !=  rightValue; break;\n    case '===': value = leftValue === rightValue; break;\n    case '!==': value = leftValue !== rightValue; break;\n    case '>':   value = leftValue >   rightValue; break;\n    case '>=':  value = leftValue >=  rightValue; break;\n    case '<':   value = leftValue <   rightValue; break;\n    case '<=':  value = leftValue <=  rightValue; break;\n    case '+':   value = leftValue +   rightValue; break;\n    case '-':   value = leftValue -   rightValue; break;\n    case '*':   value = leftValue *   rightValue; break;\n    case '/':   value = leftValue /   rightValue; break;\n    case '%':   value = leftValue %   rightValue; break;\n    case '&':   value = leftValue &   rightValue; break;\n    case '|':   value = leftValue |   rightValue; break;\n    case '^':   value = leftValue ^   rightValue; break;\n    case '<<':  value = leftValue <<  rightValue; break;\n    case '>>':  value = leftValue >>  rightValue; break;\n    case '>>>': value = leftValue >>> rightValue; break;\n    case 'in':\n      if (!rightValue || !rightValue.isObject) {\n        this.throwException(this.TYPE_ERROR,\n            \"'in' expects an object, not '\" + rightValue + \"'\");\n      }\n      value = this.hasProperty(rightValue, leftValue);\n      break;\n    case 'instanceof':\n      if (!this.isa(rightValue, this.FUNCTION)) {\n        this.throwException(this.TYPE_ERROR,\n            'Right-hand side of instanceof is not an object');\n      }\n      value = leftValue.isObject ? this.isa(leftValue, rightValue) : false;\n      break;\n    default:\n      throw SyntaxError('Unknown binary operator: ' + node['operator']);\n  }\n  stack[stack.length - 1].value = value;\n};\n\nprivate stepBlockStatement(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  var n = state.n_ || 0;\n  var expression = node['body'][n];\n  if (expression) {\n    state.n_ = n + 1;\n    return new Interpreter.MyState(expression, state.scope);\n  }\n  stack.pop();\n};\n\nprivate stepBreakStatement(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  stack.pop();\n  var label = null;\n  if (node['label']) {\n    label = node['label']['name'];\n  }\n  while (state &&\n         state.node['type'] !== 'CallExpression' &&\n         state.node['type'] !== 'NewExpression') {\n    if (label) {\n      if (state.labels && state.labels.indexOf(label) !== -1) {\n        return;\n      }\n    } else if (state.isLoop || state.isSwitch) {\n      return;\n    }\n    state = stack.pop();\n  }\n  // Syntax error, do not allow this error to be trapped.\n  throw SyntaxError('Illegal break statement');\n};\n\nprivate stepCallExpression(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  if (!state.doneCallee_) {\n    state.doneCallee_ = 1;\n    // Components needed to determine value of 'this'.\n    var nextState = new Interpreter.MyState(node['callee'], state.scope);\n    nextState.components = true;\n    return nextState;\n  }\n  if (state.doneCallee_ === 1) {\n    // Determine value of the function.\n    state.doneCallee_ = 2;\n    var func = state.value;\n    if (Array.isArray(func)) {\n      state.func_ = this.getValue(func);\n      if (func[0] !== Interpreter.SCOPE_REFERENCE) {\n        // Method function, 'this' is object (ignored if invoked as 'new').\n        state.funcThis_ = func[0];\n      }\n      func = state.func_;\n      if (func && typeof func === 'object' && func.isGetter) {\n        // Clear the getter flag and call the getter function.\n        func.isGetter = false;\n        state.doneCallee_ = 1;\n        return this.createGetter_(/** @type {!Interpreter.Object} */ (func),\n                         state.value);\n      }\n    } else {\n      // Already evaluated function: (function(){...})();\n      state.func_ = func;\n    }\n    state.arguments_ = [];\n    state.n_ = 0;\n  }\n  var func = state.func_;\n  if (!state.doneArgs_) {\n    if (state.n_ !== 0) {\n      state.arguments_.push(state.value);\n    }\n    if (node['arguments'][state.n_]) {\n      return new Interpreter.MyState(node['arguments'][state.n_++], state.scope);\n    }\n    // Determine value of 'this' in function.\n    if (node['type'] === 'NewExpression') {\n      if (func.illegalConstructor) {\n        // Illegal: new escape();\n        this.throwException(this.TYPE_ERROR, func + ' is not a constructor');\n      }\n      // Constructor, 'this' is new object.\n      state.funcThis_ = this.createObject(func);\n      state.isConstructor = true;\n    } else if (state.funcThis_ === undefined) {\n      // Global function, 'this' is global object (or 'undefined' if strict).\n      state.funcThis_ = state.scope.strict ? undefined : this.global;\n    }\n    state.doneArgs_ = true;\n  }\n  if (!state.doneExec_) {\n    state.doneExec_ = true;\n    if (!func || !func.isObject) {\n      this.throwException(this.TYPE_ERROR, func + ' is not a function');\n    }\n    var funcNode = func.node;\n    if (funcNode) {\n      var scope = this.createScope(funcNode['body'], func.parentScope);\n      // Add all arguments.\n      for (var i = 0; i < funcNode['params'].length; i++) {\n        var paramName = funcNode['params'][i]['name'];\n        var paramValue = state.arguments_.length > i ? state.arguments_[i] :\n            undefined;\n        this.setProperty(scope, paramName, paramValue);\n      }\n      // Build arguments variable.\n      var argsList = this.createObjectProto(this.ARRAY_PROTO);\n      for (var i = 0; i < state.arguments_.length; i++) {\n        this.setProperty(argsList, i, state.arguments_[i]);\n      }\n      this.setProperty(scope, 'arguments', argsList);\n      // Add the function's name (var x = function foo(){};)\n      var name = funcNode['id'] && funcNode['id']['name'];\n      if (name) {\n        this.setProperty(scope, name, func);\n      }\n      this.setProperty(scope, 'this', state.funcThis_,\n                       Interpreter.READONLY_DESCRIPTOR);\n      state.value = undefined;  // Default value if no explicit return.\n      return new Interpreter.MyState(funcNode['body'], scope);\n    } else if (func.eval) {\n      var code = state.arguments_[0];\n      if (typeof code !== 'string') {\n        // JS does not parse String objects:\n        // eval(new String('1 + 1')) -> '1 + 1'\n        state.value = code;\n      } else {\n        try {\n          var ast = Interpreter.acorn.parse(code.toString(), Interpreter.PARSE_OPTIONS);\n        } catch (e) {\n          // Acorn threw a SyntaxError.  Rethrow as a trappable error.\n          this.throwException(this.SYNTAX_ERROR, 'Invalid code: ' + e.message);\n        }\n        var evalNode = new this.nodeConstructor();\n        evalNode['type'] = 'EvalProgram_';\n        evalNode['body'] = ast['body'];\n        this.stripLocations_(evalNode, node['start'], node['end']);\n        // Update current scope with definitions in eval().\n        var scope = <Interpreter.MyObject>state.scope;\n        if (scope.strict) {\n          // Strict mode get its own scope in eval.\n          scope = this.createScope(ast, scope);\n        } else {\n          // Non-strict mode pollutes the current scope.\n          this.populateScope_(ast, scope);\n        }\n        this.value = undefined;  // Default value if no code.\n        return new Interpreter.MyState(evalNode, scope);\n      }\n    } else if (func.nativeFunc) {\n      state.value = func.nativeFunc.apply(state.funcThis_, state.arguments_);\n    } else if (func.asyncFunc) {\n      var thisInterpreter = this;\n      var callback = function(value) {\n        state.value = value;\n        thisInterpreter.paused_ = false;\n      };\n      var argsWithCallback = state.arguments_.concat(callback);\n      this.paused_ = true;\n      func.asyncFunc.apply(state.funcThis_, argsWithCallback);\n      return;\n    } else {\n      /* A child of a function is a function but is not callable.  For example:\n      var F = function() {};\n      F.prototype = escape;\n      var f = new F();\n      f();\n      */\n      this.throwException(this.TYPE_ERROR, func.class + ' is not a function');\n    }\n  } else {\n    // Execution complete.  Put the return value on the stack.\n    stack.pop();\n    if (state.isConstructor && typeof state.value !== 'object') {\n      stack[stack.length - 1].value = state.funcThis_;\n    } else {\n      stack[stack.length - 1].value = state.value;\n    }\n  }\n};\n\nprivate stepCatchClause(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  if (!state.done_) {\n    state.done_ = true;\n    // Create an empty scope.\n    var scope = this.createSpecialScope(state.scope);\n    // Add the argument.\n    this.setProperty(scope, node['param']['name'], state.throwValue);\n    // Execute catch clause.\n    return new Interpreter.MyState(node['body'], scope);\n  } else {\n    stack.pop();\n  }\n};\n\nprivate stepConditionalExpression(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  var mode = state.mode_ || 0;\n  if (mode === 0) {\n    state.mode_ = 1;\n    return new Interpreter.MyState(node['test'], state.scope);\n  }\n  if (mode === 1) {\n    state.mode_ = 2;\n    var value = Boolean(state.value);\n    if (value && node['consequent']) {\n      // Execute 'if' block.\n      return new Interpreter.MyState(node['consequent'], state.scope);\n    } else if (!value && node['alternate']) {\n      // Execute 'else' block.\n      return new Interpreter.MyState(node['alternate'], state.scope);\n    }\n    // eval('1;if(false){2}') -> undefined\n    this.value = undefined;\n  }\n  stack.pop();\n  if (node['type'] === 'ConditionalExpression') {\n    stack[stack.length - 1].value = state.value;\n  }\n};\n\nprivate stepContinueStatement(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  stack.pop();\n  var label = null;\n  if (node['label']) {\n    label = node['label']['name'];\n  }\n  state = stack[stack.length - 1];\n  while (state &&\n         state.node['type'] !== 'CallExpression' &&\n         state.node['type'] !== 'NewExpression') {\n    if (state.isLoop) {\n      if (!label || (state.labels && state.labels.indexOf(label) !== -1)) {\n        return;\n      }\n    }\n    stack.pop();\n    state = stack[stack.length - 1];\n  }\n  // Syntax error, do not allow this error to be trapped.\n  throw SyntaxError('Illegal continue statement');\n};\n\nprivate stepDebuggerStatement(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  // Do nothing.  May be overridden by developers.\n  stack.pop();\n};\n\nprivate stepDoWhileStatement(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  if (node['type'] === 'DoWhileStatement' && state.test_ === undefined) {\n    // First iteration of do/while executes without checking test.\n    state.value = true;\n    state.test_ = true;\n  }\n  if (!state.test_) {\n    state.test_ = true;\n    return new Interpreter.MyState(node['test'], state.scope);\n  }\n  if (!state.value) {  // Done, exit loop.\n    stack.pop();\n  } else if (node['body']) {  // Execute the body.\n    state.test_ = false;\n    state.isLoop = true;\n    return new Interpreter.MyState(node['body'], state.scope);\n  }\n};\n\nprivate stepEmptyStatement(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  stack.pop();\n};\n\nprivate stepEvalProgram_(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  var n = state.n_ || 0;\n  var expression = node['body'][n];\n  if (expression) {\n    state.n_ = n + 1;\n    return new Interpreter.MyState(expression, state.scope);\n  }\n  stack.pop();\n  stack[stack.length - 1].value = this.value;\n};\n\nprivate stepExpressionStatement(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  if (!state.done_) {\n    state.done_ = true;\n    return new Interpreter.MyState(node['expression'], state.scope);\n  }\n  stack.pop();\n  // Save this value to interpreter.value for use as a return value if\n  // this code is inside an eval function.\n  this.value = state.value;\n};\n\nprivate stepForInStatement(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  // First, initialize a variable if exists.  Only do so once, ever.\n  if (!state.doneInit_) {\n    state.doneInit_ = true;\n    if (node['left']['declarations'] &&\n        node['left']['declarations'][0]['init']) {\n      if (state.scope.strict) {\n        this.throwException(this.SYNTAX_ERROR,\n            'for-in loop variable declaration may not have an initializer.');\n      }\n      // Variable initialization: for (var x = 4 in y)\n      return new Interpreter.MyState(node['left'], state.scope);\n    }\n  }\n  // Second, look up the object.  Only do so once, ever.\n  if (!state.doneObject_) {\n    state.doneObject_ = true;\n    if (!state.variable_) {\n      state.variable_ = state.value;\n    }\n    return new Interpreter.MyState(node['right'], state.scope);\n  }\n  if (!state.isLoop) {\n    // First iteration.\n    state.isLoop = true;\n    state.object_ = state.value;\n    state.visited_ = Object.create(null);\n  }\n  // Third, find the property name for this iteration.\n  if (state.name_ === undefined) {\n    done: do {\n      if (state.object_ && state.object_.isObject) {\n        if (!state.props_) {\n          state.props_ = Object.getOwnPropertyNames(state.object_.properties);\n        }\n        do {\n          var prop = state.props_.shift();\n        } while (prop && (state.visited_[prop] ||\n            !Object.prototype.hasOwnProperty.call(state.object_.properties,\n                                                  prop)));\n        if (prop) {\n          state.visited_[prop] = true;\n          if (Object.prototype.propertyIsEnumerable.call(\n              state.object_.properties, prop)) {\n            state.name_ = prop;\n            break done;\n          }\n        }\n      } else if (state.object_ !== null) {\n        if (!state.props_) {\n          state.props_ = Object.getOwnPropertyNames(state.object_);\n        }\n        do {\n          var prop = state.props_.shift();\n        } while (prop && state.visited_[prop]);\n        if (prop) {\n          state.visited_[prop] = true;\n          state.name_ = prop;\n          break done;\n        }\n      }\n      state.object_ = this.getPrototype(state.object_);\n      state.props_ = null;\n    } while (state.object_ !== null);\n    if (state.object_ === null) {\n      // Done, exit loop.\n      stack.pop();\n      return;\n    }\n  }\n  // Fourth, find the variable\n  if (!state.doneVariable_) {\n    state.doneVariable_ = true;\n    var left = node['left'];\n    if (left['type'] === 'VariableDeclaration') {\n      // Inline variable declaration: for (var x in y)\n      state.variable_ =\n          [Interpreter.SCOPE_REFERENCE, left['declarations'][0]['id']['name']];\n    } else {\n      // Arbitrary left side: for (foo().bar in y)\n      state.variable_ = null;\n      var nextState = new Interpreter.MyState(left, state.scope);\n      nextState.components = true;\n      return nextState;\n    }\n  }\n  if (!state.variable_) {\n    state.variable_ = state.value;\n  }\n  // Fifth, set the variable.\n  if (!state.doneSetter_) {\n    state.doneSetter_ = true;\n    var value = state.name_;\n    var setter = this.setValue(state.variable_, value);\n    if (setter) {\n      return this.createSetter_(setter, state.variable_, value);\n    }\n  }\n  // Next step will be step three.\n  state.name_ = undefined;\n  // Reevaluate the variable since it could be a setter on the global object.\n  state.doneVariable_ = false;\n  state.doneSetter_ = false;\n  // Sixth and finally, execute the body if there was one.  this.\n  if (node['body']) {\n    return new Interpreter.MyState(node['body'], state.scope);\n  }\n};\n\nprivate stepForStatement(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  var mode = state.mode_ || 0;\n  if (mode === 0) {\n    state.mode_ = 1;\n    if (node['init']) {\n      return new Interpreter.MyState(node['init'], state.scope);\n    }\n  } else if (mode === 1) {\n    state.mode_ = 2;\n    if (node['test']) {\n      return new Interpreter.MyState(node['test'], state.scope);\n    }\n  } else if (mode === 2) {\n    state.mode_ = 3;\n    if (node['test'] && !state.value) {\n      // Done, exit loop.\n      stack.pop();\n    } else {  // Execute the body.\n      state.isLoop = true;\n      return new Interpreter.MyState(node['body'], state.scope);\n    }\n  } else if (mode === 3) {\n    state.mode_ = 1;\n    if (node['update']) {\n      return new Interpreter.MyState(node['update'], state.scope);\n    }\n  }\n};\n\nprivate stepFunctionDeclaration(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  // This was found and handled when the scope was populated.\n  stack.pop();\n};\n\nprivate stepFunctionExpression(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  stack.pop();\n  stack[stack.length - 1].value = this.createFunction(<ESTree.FunctionDeclaration>node, state.scope);\n};\n\nprivate stepIdentifier(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  stack.pop();\n  if (state.components) {\n    stack[stack.length - 1].value = [Interpreter.SCOPE_REFERENCE, node['name']];\n    return;\n  }\n  var value = this.getValueFromScope(node['name']);\n  // An identifier could be a getter if it's a property on the global object.\n  if (value && typeof value === 'object' && value.isGetter) {\n    // Clear the getter flag and call the getter function.\n    value.isGetter = false;\n    var scope = state.scope;\n    while (!this.hasProperty(scope, node['name'])) {\n      scope = scope.parentScope;\n    }\n    var func = /** @type {!Interpreter.Object} */ (value);\n    return this.createGetter_(func, this.global);\n  }\n  stack[stack.length - 1].value = value;\n};\n\nprivate stepIfStatement(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  return this.stepConditionalExpression(stack, state, node);\n}\n\nprivate stepLabeledStatement(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  // No need to hit this node again on the way back up the stack.\n  stack.pop();\n  // Note that a statement might have multiple labels.\n  var labels = state.labels || [];\n  labels.push(node['label']['name']);\n  var nextState = new Interpreter.MyState(node['body'], state.scope);\n  nextState.labels = labels;\n  return nextState;\n};\n\nprivate stepLiteral(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  stack.pop();\n  var value = node['value'];\n  if (value instanceof RegExp) {\n    var pseudoRegexp = this.createObjectProto(this.REGEXP_PROTO);\n    this.populateRegExp(pseudoRegexp, value);\n    value = pseudoRegexp;\n  }\n  stack[stack.length - 1].value = value;\n};\n\nprivate stepLogicalExpression(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  if (node['operator'] !== '&&' && node['operator'] !== '||') {\n    throw SyntaxError('Unknown logical operator: ' + node['operator']);\n  }\n  if (!state.doneLeft_) {\n    state.doneLeft_ = true;\n    return new Interpreter.MyState(node['left'], state.scope);\n  }\n  if (!state.doneRight_) {\n    if ((node['operator'] === '&&' && !state.value) ||\n        (node['operator'] === '||' && state.value)) {\n      // Shortcut evaluation.\n      stack.pop();\n      stack[stack.length - 1].value = state.value;\n    } else {\n      state.doneRight_ = true;\n      return new Interpreter.MyState(node['right'], state.scope);\n    }\n  } else {\n    stack.pop();\n    stack[stack.length - 1].value = state.value;\n  }\n};\n\nprivate stepMemberExpression(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  if (!state.doneObject_) {\n    state.doneObject_ = true;\n    return new Interpreter.MyState(node['object'], state.scope);\n  }\n  var propName;\n  if (!node['computed']) {\n    state.object_ = state.value;\n    // obj.foo -- Just access 'foo' directly.\n    propName = node['property']['name'];\n  } else if (!state.doneProperty_) {\n    state.object_ = state.value;\n    // obj[foo] -- Compute value of 'foo'.\n    state.doneProperty_ = true;\n    return new Interpreter.MyState(node['property'], state.scope);\n  } else {\n    propName = state.value;\n  }\n  stack.pop();\n  if (state.components) {\n    stack[stack.length - 1].value = [state.object_, propName];\n  } else {\n    var value = this.getProperty(state.object_, propName);\n    if (value && typeof value === 'object' && value.isGetter) {\n      // Clear the getter flag and call the getter function.\n      value.isGetter = false;\n      var func = /** @type {!Interpreter.Object} */ (value);\n      return this.createGetter_(func, state.object_);\n    }\n    stack[stack.length - 1].value = value;\n  }\n};\n\nprivate stepNewExpression(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  return this.stepCallExpression(stack, state, node);\n}\n\nprivate stepObjectExpression(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  var n = state.n_ || 0;\n  var property = node['properties'][n];\n  if (!state.object_) {\n    // First execution.\n    state.object_ = this.createObjectProto(this.OBJECT_PROTO);\n    state.properties_ = Object.create(null);\n  } else {\n    // Determine property name.\n    var key = <string>property['key'];\n    if (key['type'] === 'Identifier') {\n      var propName = key['name'];\n    } else if (key['type'] === 'Literal') {\n      var propName = key['value'];\n    } else {\n      throw SyntaxError('Unknown object structure: ' + key['type']);\n    }\n    // Set the property computed in the previous execution.\n    if (!state.properties_[propName]) {\n      // Create temp object to collect value, getter, and/or setter.\n      state.properties_[propName] = {};\n    }\n    state.properties_[propName][property['kind']] = state.value;\n    state.n_ = ++n;\n    property = node['properties'][n];\n  }\n  if (property) {\n    return new Interpreter.MyState(property['value'], state.scope);\n  }\n  for (var key in state.properties_) {\n    var kinds = state.properties_[key];\n    if ('get' in kinds || 'set' in kinds) {\n      // Set a property with a getter or setter.\n      var descriptor = {\n        configurable: true,\n        enumerable: true,\n        get: kinds['get'],\n        set: kinds['set']\n      };\n      this.setProperty(state.object_, key, null, descriptor);\n    } else {\n      // Set a normal property with a value.\n      this.setProperty(state.object_, key, kinds['init']);\n    }\n  }\n  stack.pop();\n  stack[stack.length - 1].value = state.object_;\n};\n\nprivate stepProgram(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  var n = state.n_ || 0;\n  var expression = node['body'][n];\n  if (expression) {\n    state.done = false;\n    state.n_ = n + 1;\n    return new Interpreter.MyState(expression, state.scope);\n  }\n  state.done = true;\n  // Don't pop the stateStack.\n  // Leave the root scope on the tree in case the program is appended to.\n};\n\nprivate stepReturnStatement(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  if (node['argument'] && !state.done_) {\n    state.done_ = true;\n    return new Interpreter.MyState(node['argument'], state.scope);\n  }\n  var value = state.value;\n  var i = stack.length - 1;\n  state = stack[i];\n  while (state.node['type'] !== 'CallExpression' &&\n         state.node['type'] !== 'NewExpression') {\n    if (state.node['type'] !== 'TryStatement') {\n      stack.splice(i, 1);\n    }\n    i--;\n    if (i < 0) {\n      // Syntax error, do not allow this error to be trapped.\n      throw SyntaxError('Illegal return statement');\n    }\n    state = stack[i];\n  }\n  state.value = value;\n};\n\nprivate stepSequenceExpression(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  var n = state.n_ || 0;\n  var expression = node['expressions'][n];\n  if (expression) {\n    state.n_ = n + 1;\n    return new Interpreter.MyState(expression, state.scope);\n  }\n  stack.pop();\n  stack[stack.length - 1].value = state.value;\n};\n\nprivate stepSwitchStatement(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  if (!state.test_) {\n    state.test_ = 1;\n    return new Interpreter.MyState(node['discriminant'], state.scope);\n  }\n  if (state.test_ === 1) {\n    state.test_ = 2;\n    // Preserve switch value between case tests.\n    state.switchValue_ = state.value;\n  }\n\n  while (true) {\n    var index = state.index_ || 0;\n    var switchCase = node['cases'][index];\n    if (!state.matched_ && switchCase && !switchCase['test']) {\n      // Test on the default case is null.\n      // Bypass (but store) the default case, and get back to it later.\n      state.defaultCase_ = index;\n      state.index_ = index + 1;\n      continue;\n    }\n    if (!switchCase && !state.matched_ && state.defaultCase_) {\n      // Ran through all cases, no match.  Jump to the default.\n      state.matched_ = true;\n      state.index_ = state.defaultCase_;\n      continue;\n    }\n    if (switchCase) {\n      if (!state.matched_ && !state.tested_ && switchCase['test']) {\n        state.tested_ = true;\n        return new Interpreter.MyState(switchCase['test'], state.scope);\n      }\n      if (state.matched_ || state.value === state.switchValue_) {\n        state.matched_ = true;\n        var n = state.n_ || 0;\n        if (switchCase['consequent'][n]) {\n          state.isSwitch = true;\n          state.n_ = n + 1;\n          return new Interpreter.MyState(switchCase['consequent'][n],\n                                       state.scope);\n        }\n      }\n      // Move on to next case.\n      state.tested_ = false;\n      state.n_ = 0;\n      state.index_ = index + 1;\n    } else {\n      stack.pop();\n      return;\n    }\n  }\n};\n\nprivate stepThisExpression(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  stack.pop();\n  stack[stack.length - 1].value = this.getValueFromScope('this');\n};\n\nprivate stepThrowStatement(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  if (!state.done_) {\n    state.done_ = true;\n    return new Interpreter.MyState(node['argument'], state.scope);\n  } else {\n    this.throwException(state.value);\n  }\n};\n\nprivate stepTryStatement(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  if (!state.doneBlock_) {\n    state.doneBlock_ = true;\n    return new Interpreter.MyState(node['block'], state.scope);\n  }\n  if (state.throwValue && !state.doneHandler_ && node['handler']) {\n    state.doneHandler_ = true;\n    var nextState = new Interpreter.MyState(node['handler'], state.scope);\n    nextState.throwValue = state.throwValue;\n    state.throwValue = null;  // This error has been handled, don't rethrow.\n    return nextState;\n  }\n  if (!state.doneFinalizer_ && node['finalizer']) {\n    state.doneFinalizer_ = true;\n    return new Interpreter.MyState(node['finalizer'], state.scope);\n  }\n  if (state.throwValue) {\n    // There was no catch handler, or the catch/finally threw an error.\n    // Throw the error up to a higher try.\n    this.executeException(state.throwValue);\n  } else {\n    stack.pop();\n  }\n};\n\nprivate stepUnaryExpression(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  if (!state.done_) {\n    state.done_ = true;\n    var nextState = new Interpreter.MyState(node['argument'], state.scope);\n    nextState.components = node['operator'] === 'delete';\n    return nextState;\n  }\n  stack.pop();\n  var value = state.value;\n  if (node['operator'] === '-') {\n    value = -value;\n  } else if (node['operator'] === '+') {\n    value = +value;\n  } else if (node['operator'] === '!') {\n    value = !value;\n  } else if (node['operator'] === '~') {\n    value = ~value;\n  } else if (node['operator'] === 'delete') {\n    var result = true;\n    // If value is not an array, then it is a primitive, or some other value.\n    // If so, skip the delete and return true.\n    if (Array.isArray(value)) {\n      var obj = value[0];\n      if (obj === Interpreter.SCOPE_REFERENCE) {\n        // 'delete foo;' is the same as 'delete window.foo'.\n        obj = state.scope;\n      }\n      var name = String(value[1]);\n      try {\n        delete obj.properties[name];\n      } catch (e) {\n        if (state.scope.strict) {\n          this.throwException(this.TYPE_ERROR, \"Cannot delete property '\" +\n                              name + \"' of '\" + obj + \"'\");\n        } else {\n          result = false;\n        }\n      }\n    }\n    value = result;\n  } else if (node['operator'] === 'typeof') {\n    value = (value && value.class === 'Function') ? 'function' : typeof value;\n  } else if (node['operator'] === 'void') {\n    value = undefined;\n  } else {\n    throw SyntaxError('Unknown unary operator: ' + node['operator']);\n  }\n  stack[stack.length - 1].value = value;\n};\n\nprivate stepUpdateExpression(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  if (!state.doneLeft_) {\n    state.doneLeft_ = true;\n    var nextState = new Interpreter.MyState(node['argument'], state.scope);\n    nextState.components = true;\n    return nextState;\n  }\n  if (!state.leftSide_) {\n    state.leftSide_ = state.value;\n  }\n  if (state.doneGetter_) {\n    state.leftValue_ = state.value;\n  }\n  if (!state.doneGetter_) {\n    var leftValue = this.getValue(state.leftSide_);\n    state.leftValue_ = leftValue;\n    if (leftValue && typeof leftValue === 'object' && leftValue.isGetter) {\n      // Clear the getter flag and call the getter function.\n      leftValue.isGetter = false;\n      state.doneGetter_ = true;\n      var func = /** @type {!Interpreter.Object} */ (leftValue);\n      return this.createGetter_(func, state.leftSide_);\n    }\n  }\n  if (state.doneSetter_) {\n    // Return if setter function.\n    // Setter method on property has completed.\n    // Ignore its return value, and use the original set value instead.\n    stack.pop();\n    stack[stack.length - 1].value = state.doneSetter_;\n    return;\n  }\n  leftValue = Number(state.leftValue_);\n  var changeValue;\n  if (node['operator'] === '++') {\n    changeValue = leftValue + 1;\n  } else if (node['operator'] === '--') {\n    changeValue = leftValue - 1;\n  } else {\n    throw SyntaxError('Unknown update expression: ' + node['operator']);\n  }\n  var returnValue = node['prefix'] ? changeValue : leftValue;\n  var setter = this.setValue(state.leftSide_, changeValue);\n  if (setter) {\n    state.doneSetter_ = returnValue;\n    return this.createSetter_(setter, state.leftSide_, changeValue);\n  }\n  // Return if no setter function.\n  stack.pop();\n  stack[stack.length - 1].value = returnValue;\n};\n\nprivate stepVariableDeclaration(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  var declarations = node['declarations'];\n  var n = state.n_ || 0;\n  var declarationNode = declarations[n];\n  if (state.init_ && declarationNode) {\n    // This setValue call never needs to deal with calling a setter function.\n    // Note that this is setting the init value, not defining the variable.\n    // Variable definition is done when scope is populated.\n    this.setValueToScope(declarationNode['id']['name'], state.value);\n    state.init_ = false;\n    declarationNode = declarations[++n];\n  }\n  while (declarationNode) {\n    // Skip any declarations that are not initialized.  They have already\n    // been defined as undefined in populateScope_.\n    if (declarationNode['init']) {\n      state.n_ = n;\n      state.init_ = true;\n      return new Interpreter.MyState(declarationNode['init'], state.scope);\n    }\n    declarationNode = declarations[++n];\n  }\n  stack.pop();\n};\n\nprivate stepWithStatement(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  if (!state.doneObject_) {\n    state.doneObject_ = true;\n    return new Interpreter.MyState(node['object'], state.scope);\n  } else if (!state.doneBody_) {\n    state.doneBody_ = true;\n    var scope = this.createSpecialScope(state.scope, state.value);\n    return new Interpreter.MyState(node['body'], scope);\n  } else {\n    stack.pop();\n  }\n};\n\nprivate stepWhileStatement(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  return this.stepDoWhileStatement(stack, state, node);\n}\n}\n\nmodule Interpreter {\n/**\n * Class for an object.\n * @param {Interpreter.MyObject} proto Prototype object or null.\n * @constructor\n */\nexport class MyObject {\n[key: string]: any;\ngetter: any;\nsetter: any;\nproperties: any;\n\nconstructor(proto) {\n  this.getter = Object.create(null);\n  this.setter = Object.create(null);\n  this.properties = Object.create(null);\n  this.proto = proto;\n}\n\n/** @type {Interpreter.MyObject} */\nproto: Interpreter.MyObject = null;\n\n/** @type {boolean} */\nisObject = true;\n\n/** @type {string} */\nclass = 'Object';\n\n/** @type {Date|RegExp|boolean|number|string|undefined|null} */\ndata: Date | RegExp | boolean | number | string | undefined | null = null;\n\n/**\n * Convert this object into a string.\n * @return {string} String value.\n * @override\n */\ntoString() {\n  if (this.class === 'Array') {\n    // Array\n    var cycles = Interpreter.toStringCycles_;\n    cycles.push(this);\n    try {\n      var strs = [];\n      for (var i = 0; i < this.properties.length; i++) {\n        var value = this.properties[i];\n        strs[i] = (value && value.isObject && cycles.indexOf(value) !== -1) ?\n            '...' : value;\n      }\n    } finally {\n      cycles.pop();\n    }\n    return strs.join(',');\n  }\n  if (this.class === 'Error') {\n    var cycles = Interpreter.toStringCycles_;\n    if (cycles.indexOf(this) !== -1) {\n      return '[object Error]';\n    }\n    var name, message;\n    // Bug: Does not support getters and setters for name or message.\n    var obj = <Interpreter.MyObject>this;\n    do {\n      if ('name' in obj.properties) {\n        name = obj.properties['name'];\n        break;\n      }\n    } while ((obj = obj.proto));\n    var obj = <Interpreter.MyObject>this;\n    do {\n      if ('message' in obj.properties) {\n        message = obj.properties['message'];\n        break;\n      }\n    } while ((obj = obj.proto));\n    cycles.push(this);\n    try {\n      name = name && name.toString();\n      message = message && message.toString();\n    } finally {\n      cycles.pop();\n    }\n    return message ? name + ': ' + message : String(name);\n  }\n\n  // RegExp, Date, and boxed primitives.\n  if (this.data !== null) {\n    return String(this.data);\n  }\n\n  return '[object ' + this.class + ']';\n}\n\n/**\n * Return the object's value.\n * @return {Interpreter.MyValue} Value.\n * @override\n */\nvalueOf() {\n  if (this.data === undefined || this.data === null ||\n      this.data instanceof RegExp) {\n    return this; // An Object.\n  }\n  if (this.data instanceof Date) {\n    return this.data.valueOf();  // Milliseconds.\n  }\n  return /** @type {(boolean|number|string)} */ (this.data);  // Boxed primitive.\n}\n}\n\n/**\n * Typedef for JS values.\n * @typedef {!Interpreter.MyObject|boolean|number|string|undefined|null}\n */\nexport type MyValue = MyObject | boolean | number | string | undefined | null;\n\n/**\n * Class for a state.\n * @param {!MyObject} node AST node for the state.\n * @param {!Interpreter.MyObject} scope Scope object for the state.\n * @constructor\n */\nexport class MyState {\n[key: string]: any;\nnode: ESTree.BaseNode;\nscope: Interpreter.MyObject;\nconstructor(node: ESTree.BaseNode, scope: Interpreter.MyObject) {\n  this.node = node;\n  this.scope = scope;\n}\n}\n\nexport interface MyValueTable {\n  pseudo: MyValue[],\n  native: any[]\n}\n\nexport interface MyDescriptor {\n  get?: MyObject;\n  set?: MyObject;\n  configurable?: boolean;\n  enumerable?: boolean;\n  writable?: boolean;\n  value?: any;\n}\n\nexport interface Acorn {\n  parse(code: string, options?: any): ESTree.Program;\n}\n\nexport interface NodeConstructor {\n  new (): ESTree.BaseNode;\n}\n\nexport interface NativeFunction extends Function {\n  id?: number;\n}\n}\n\n// These lines are added for API compatibility\nInterpreter['Object'] = Interpreter.MyObject;\nInterpreter['State'] = Interpreter.MyState;\n\n// Look for globally-defined acorn\ntry {\n  Interpreter.acorn = (self || global)['acorn'];\n} catch (e) {\n  // do nothing if we fail\n}\n\nexport = Interpreter;\n\n\n\n// WEBPACK FOOTER //\n// ./lib/interpreter.ts","var g;\r\n\r\n// This works in non-strict mode\r\ng = (function() {\r\n\treturn this;\r\n})();\r\n\r\ntry {\r\n\t// This works if eval is allowed (see CSP)\r\n\tg = g || Function(\"return this\")() || (1,eval)(\"this\");\r\n} catch(e) {\r\n\t// This works if the window reference is available\r\n\tif(typeof window === \"object\")\r\n\t\tg = window;\r\n}\r\n\r\n// g can still be undefined, but nothing to do about it...\r\n// We return undefined, instead of nothing here, so it's\r\n// easier to handle this case. if(!global) { ...}\r\n\r\nmodule.exports = g;\r\n\n\n\n//////////////////\n// WEBPACK FOOTER\n// (webpack)/buildin/global.js\n// module id = 5\n// module chunks = 0"],"sourceRoot":""}
\ No newline at end of file
diff --git a/dist/interpreter.d.ts b/dist/interpreter.d.ts
new file mode 100644
index 00000000..854b59e0
--- /dev/null
+++ b/dist/interpreter.d.ts
@@ -0,0 +1,533 @@
+/// <reference path="../lib/_estree.d.ts" />
+/**
+ * @license
+ * JavaScript Interpreter
+ *
+ * Copyright 2013-2017 Google Inc. and Jun Kato
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+/**
+ * @fileoverview Interpreting JavaScript in JavaScript.
+ * @author fraser@google.com (Neil Fraser)
+ * @author i@junkato.jp (Jun Kato)
+ */
+/**
+ * Create a new interpreter.
+ * @param {string|!Object} code Raw JavaScript text or AST.
+ * @param {Function=} opt_initFunc Optional initialization function.  Used to
+ *     define APIs.  When called it is passed the interpreter object and the
+ *     global scope object.
+ * @constructor
+ */
+declare class Interpreter {
+    static acorn: Interpreter.Acorn;
+    private nodeConstructor;
+    ast: ESTree.Program;
+    global: Interpreter.MyObject;
+    stateStack: Interpreter.MyState[];
+    value: Interpreter.MyValue;
+    private initFunc_;
+    private paused_;
+    private polyfills_;
+    private functionCounter_;
+    private stepFunctions_;
+    OBJECT: Interpreter.MyObject;
+    OBJECT_PROTO: Interpreter.MyObject;
+    FUNCTION: Interpreter.MyObject;
+    FUNCTION_PROTO: Interpreter.MyObject;
+    ARRAY: Interpreter.MyObject;
+    ARRAY_PROTO: Interpreter.MyObject;
+    REGEXP: Interpreter.MyObject;
+    REGEXP_PROTO: Interpreter.MyObject;
+    ERROR: Interpreter.MyObject;
+    EVAL_ERROR: Interpreter.MyObject;
+    RANGE_ERROR: Interpreter.MyObject;
+    REFERENCE_ERROR: Interpreter.MyObject;
+    SYNTAX_ERROR: Interpreter.MyObject;
+    TYPE_ERROR: Interpreter.MyObject;
+    URI_ERROR: Interpreter.MyObject;
+    STRING: Interpreter.MyObject;
+    BOOLEAN: Interpreter.MyObject;
+    NUMBER: Interpreter.MyObject;
+    DATE: Interpreter.MyObject;
+    UNDEFINED: Interpreter.MyObject;
+    NULL: null;
+    NAN: number;
+    TRUE: boolean;
+    FALSE: boolean;
+    STRING_EMPTY: string;
+    NUMBER_ZERO: number;
+    NUMBER_ONE: number;
+    constructor(code: string | ESTree.Program, opt_initFunc?: (i: Interpreter, scope: Interpreter.MyObject) => void);
+    /**
+     * @const {!Object} Configuration used for all Acorn parsing.
+     */
+    static PARSE_OPTIONS: {
+        ecmaVersion: number;
+    };
+    /**
+     * Property descriptor of readonly properties.
+     */
+    static READONLY_DESCRIPTOR: Interpreter.MyDescriptor;
+    /**
+     * Property descriptor of non-enumerable properties.
+     */
+    static NONENUMERABLE_DESCRIPTOR: Interpreter.MyDescriptor;
+    /**
+     * Property descriptor of readonly, non-enumerable properties.
+     */
+    static READONLY_NONENUMERABLE_DESCRIPTOR: Interpreter.MyDescriptor;
+    /**
+     * Property descriptor of variables.
+     */
+    static VARIABLE_DESCRIPTOR: Interpreter.MyDescriptor;
+    /**
+     * Unique symbol for indicating that a step has encountered an error, has
+     * added it to the stack, and will be thrown within the user's program.
+     * When STEP_ERROR is thrown in the JS-Interpreter, the error can be ignored.
+     */
+    static STEP_ERROR: {};
+    /**
+     * Unique symbol for indicating that a reference is a variable on the scope,
+     * not an object property.
+     */
+    static SCOPE_REFERENCE: {};
+    /**
+     * For cycle detection in array to string and error conversion;
+     * see spec bug github.com/tc39/ecma262/issues/289
+     * Since this is for atomic actions only, it can be a class property.
+     */
+    static toStringCycles_: any[];
+    /**
+     * Add more code to the interpreter.
+     * @param {string|!Object} code Raw JavaScript text or AST.
+     */
+    appendCode(code: string | ESTree.Node): void;
+    /**
+     * Execute one step of the interpreter.
+     * @return {boolean} True if a step was executed, false if no more instructions.
+     */
+    step(): boolean;
+    /**
+     * Execute the interpreter to program completion.  Vulnerable to infinite loops.
+     * @return {boolean} True if a execution is asynchronously blocked,
+     *     false if no more instructions.
+     */
+    run(): boolean;
+    /**
+     * Initialize the global scope with buitin properties and functions.
+     * @param {!Interpreter.MyObject} scope Global scope.
+     */
+    initGlobalScope(scope: Interpreter.MyObject): void;
+    /**
+     * Initialize the Function class.
+     * @param {!Interpreter.MyObject} scope Global scope.
+     */
+    initFunction(scope: Interpreter.MyObject): void;
+    /**
+     * Initialize the Object class.
+     * @param {!Interpreter.MyObject} scope Global scope.
+     */
+    initObject(scope: Interpreter.MyObject): void;
+    /**
+     * Initialize the Array class.
+     * @param {!Interpreter.MyObject} scope Global scope.
+     */
+    initArray(scope: Interpreter.MyObject): void;
+    /**
+     * Initialize the String class.
+     * @param {!Interpreter.MyObject} scope Global scope.
+     */
+    initString(scope: Interpreter.MyObject): void;
+    /**
+     * Initialize the Boolean class.
+     * @param {!Interpreter.MyObject} scope Global scope.
+     */
+    initBoolean(scope: Interpreter.MyObject): void;
+    /**
+     * Initialize the Number class.
+     * @param {!Interpreter.MyObject} scope Global scope.
+     */
+    initNumber(scope: Interpreter.MyObject): void;
+    /**
+     * Initialize the Date class.
+     * @param {!Interpreter.MyObject} scope Global scope.
+     */
+    initDate(scope: Interpreter.MyObject): void;
+    /**
+     * Initialize Regular Expression object.
+     * @param {!Interpreter.MyObject} scope Global scope.
+     */
+    initRegExp(scope: Interpreter.MyObject): void;
+    /**
+     * Initialize the Error class.
+     * @param {!Interpreter.MyObject} scope Global scope.
+     */
+    initError(scope: Interpreter.MyObject): void;
+    /**
+     * Initialize Math object.
+     * @param {!Interpreter.MyObject} scope Global scope.
+     */
+    initMath(scope: Interpreter.MyObject): void;
+    /**
+     * Initialize JSON object.
+     * @param {!Interpreter.MyObject} scope Global scope.
+     */
+    initJSON(scope: Interpreter.MyObject): void;
+    /**
+     * Is an object of a certain class?
+     * @param {Interpreter.MyValue} child Object to check.
+     * @param {Interpreter.MyObject} constructor Constructor of object.
+     * @return {boolean} True if object is the class or inherits from it.
+     *     False otherwise.
+     */
+    isa(child: Interpreter.MyValue, constructor: Interpreter.MyObject): boolean;
+    /**
+     * Is a value a legal integer for an array length?
+     * @param {Interpreter.MyValue} x Value to check.
+     * @return {number} Zero, or a positive integer if the value can be
+     *     converted to such.  NaN otherwise.
+     */
+    static legalArrayLength(x: Interpreter.MyValue): number;
+    /**
+     * Is a value a legal integer for an array index?
+     * @param {Interpreter.MyValue} x Value to check.
+     * @return {number} Zero, or a positive integer if the value can be
+     *     converted to such.  NaN otherwise.
+     */
+    static legalArrayIndex(x: Interpreter.MyValue): number;
+    /**
+     * Create a new data object based on a constructor's prototype.
+     * @param {Interpreter.MyObject} constructor Parent constructor function,
+     *     or null if scope object.
+     * @return {!Interpreter.MyObject} New data object.
+     */
+    createObject(constructor: Interpreter.MyObject): Interpreter.MyObject;
+    /**
+     * Create a new data object based on a prototype.
+     * @param {Interpreter.MyObject} proto Prototype object.
+     * @return {!Interpreter.MyObject} New data object.
+     */
+    createObjectProto(proto: Interpreter.MyObject): Interpreter.MyObject;
+    /**
+     * Initialize a pseudo regular expression object based on a native regular
+     * expression object.
+     * @param {!Interpreter.MyObject} pseudoRegexp The existing object to set.
+     * @param {!RegExp} nativeRegexp The native regular expression.
+     */
+    populateRegExp(pseudoRegexp: Interpreter.MyObject, nativeRegexp: RegExp): void;
+    /**
+     * Create a new function.
+     * @param {!Object} node AST node defining the function.
+     * @param {!Object} scope Parent scope.
+     * @return {!Interpreter.MyObject} New function.
+     */
+    createFunction(node: ESTree.FunctionDeclaration, scope: Interpreter.MyObject): Interpreter.MyObject;
+    /**
+     * Create a new native function.
+     * @param {!Function} nativeFunc JavaScript function.
+     * @param {boolean=} opt_constructor If true, the function's
+     * prototype will have its constructor property set to the function.
+     * If false, the function cannot be called as a constructor (e.g. escape).
+     * Defaults to undefined.
+     * @return {!Interpreter.MyObject} New function.
+     */
+    createNativeFunction(nativeFunc: Interpreter.NativeFunction, opt_constructor?: boolean): Interpreter.MyObject;
+    /**
+     * Create a new native asynchronous function.
+     * @param {!Function} asyncFunc JavaScript function.
+     * @return {!Interpreter.MyObject} New function.
+     */
+    createAsyncFunction(asyncFunc: any): Interpreter.MyObject;
+    /**
+     * Converts from a native JS object or value to a JS interpreter object.
+     * Can handle JSON-style values.
+     * @param {*} nativeObj The native JS object to be converted.
+     * @return {Interpreter.MyValue} The equivalent JS interpreter object.
+     */
+    nativeToPseudo(nativeObj: any): Interpreter.MyValue;
+    /**
+     * Converts from a JS interpreter object to native JS object.
+     * Can handle JSON-style values, plus cycles.
+     * @param {Interpreter.MyValue} pseudoObj The JS interpreter object to be
+     * converted.
+     * @param {Object=} opt_cycles Cycle detection (used in recursive calls).
+     * @return {*} The equivalent native JS object or value.
+     */
+    pseudoToNative(pseudoObj: Interpreter.MyValue, opt_cycles?: Interpreter.MyValueTable): any;
+    /**
+     * Look up the prototype for this value.
+     * @param {Interpreter.MyValue} value Data object.
+     * @return {Interpreter.MyObject} Prototype object, null if none.
+     */
+    getPrototype(value: Interpreter.MyValue): Interpreter.MyObject;
+    /**
+     * Fetch a property value from a data object.
+     * @param {Interpreter.MyValue} obj Data object.
+     * @param {Interpreter.MyValue} name Name of property.
+     * @return {Interpreter.MyValue} Property value (may be undefined).
+     */
+    getProperty(obj: Interpreter.MyValue, name: Interpreter.MyValue): Interpreter.MyValue;
+    /**
+     * Does the named property exist on a data object.
+     * @param {Interpreter.MyValue} obj Data object.
+     * @param {Interpreter.MyValue} name Name of property.
+     * @return {boolean} True if property exists.
+     */
+    hasProperty(obj: Interpreter.MyValue, name: Interpreter.MyValue): boolean;
+    /**
+     * Set a property value on a data object.
+     * @param {!Interpreter.MyObject} obj Data object.
+     * @param {Interpreter.MyValue} name Name of property.
+     * @param {Interpreter.MyValue|ReferenceError} value New property value.
+     *   Use ReferenceError if value is handled by descriptor instead.
+     * @param {Object=} opt_descriptor Optional descriptor object.
+     * @return {!Interpreter.MyObject|undefined} Returns a setter function if one
+     *     needs to be called, otherwise undefined.
+     */
+    setProperty(obj: Interpreter.MyObject, name: Interpreter.MyValue, value: Interpreter.MyValue | ReferenceErrorConstructor, opt_descriptor?: any): Interpreter.MyObject;
+    /**
+     * Convenience method for adding a native function as a non-enumerable property
+     * onto an object's prototype.
+     * @param {!Interpreter.MyObject} obj Data object.
+     * @param {Interpreter.MyValue} name Name of property.
+     * @param {!Function} wrapper Function object.
+     */
+    private setNativeFunctionPrototype(obj, name, wrapper);
+    /**
+     * Returns the current scope from the stateStack.
+     * @return {!Interpreter.MyObject} Current scope dictionary.
+     */
+    getScope(): Interpreter.MyObject;
+    /**
+     * Create a new scope dictionary.
+     * @param {!Object} node AST node defining the scope container
+     *     (e.g. a function).
+     * @param {Interpreter.MyObject} parentScope Scope to link to.
+     * @return {!Interpreter.MyObject} New scope.
+     */
+    createScope(node: ESTree.Node, parentScope: Interpreter.MyObject): Interpreter.MyObject;
+    /**
+     * Create a new special scope dictionary. Similar to createScope(), but
+     * doesn't assume that the scope is for a function body.
+     * This is used for 'catch' clauses and 'with' statements.
+     * @param {!Interpreter.MyObject} parentScope Scope to link to.
+     * @param {Interpreter.MyObject=} opt_scope Optional object to transform into
+     *     scope.
+     * @return {!Interpreter.MyObject} New scope.
+     */
+    createSpecialScope(parentScope: Interpreter.MyObject, opt_scope?: Interpreter.MyObject): Interpreter.MyObject;
+    /**
+     * Retrieves a value from the scope chain.
+     * @param {string} name Name of variable.
+     * @return {Interpreter.MyValue} Any value.
+     *   May be flagged as being a getter and thus needing immediate execution
+     *   (rather than being the value of the property).
+     */
+    getValueFromScope(name: string): Interpreter.MyValue;
+    /**
+     * Sets a value to the current scope.
+     * @param {string} name Name of variable.
+     * @param {Interpreter.MyValue} value Value.
+     * @return {!Interpreter.MyObject|undefined} Returns a setter function if one
+     *     needs to be called, otherwise undefined.
+     */
+    setValueToScope(name: string, value: Interpreter.MyValue): Interpreter.MyObject;
+    /**
+     * Create a new scope for the given node.
+     * @param {!Object} node AST node (program or function).
+     * @param {!Interpreter.MyObject} scope Scope dictionary to populate.
+     * @private
+     */
+    populateScope_(node: ESTree.Node, scope: Interpreter.MyObject): void;
+    /**
+     * Remove start and end values from AST, or set start and end values to a
+     * constant value.  Used to remove highlighting from polyfills and to set
+     * highlighting in an eval to cover the entire eval expression.
+     * @param {!Object} node AST node.
+     * @param {number=} start Starting character of all nodes, or undefined.
+     * @param {number=} end Ending character of all nodes, or undefined.
+     * @private
+     */
+    private stripLocations_(node, start, end);
+    /**
+     * Is the current state directly being called with as a construction with 'new'.
+     * @return {boolean} True if 'new foo()', false if 'foo()'.
+     */
+    calledWithNew(): boolean;
+    /**
+     * Gets a value from the scope chain or from an object property.
+     * @param {!Array} ref Name of variable or object/propname tuple.
+     * @return {Interpreter.MyValue} Any value.
+     *   May be flagged as being a getter and thus needing immediate execution
+     *   (rather than being the value of the property).
+     */
+    getValue(ref: any): Interpreter.MyValue;
+    /**
+     * Sets a value to the scope chain or to an object property.
+     * @param {!Array} ref Name of variable or object/propname tuple.
+     * @param {Interpreter.MyValue} value Value.
+     * @return {!Interpreter.MyObject|undefined} Returns a setter function if one
+     *     needs to be called, otherwise undefined.
+     */
+    setValue(ref: Array<any> & {
+        0: Interpreter.MyObject;
+        1: string;
+    }, value: Interpreter.MyValue): Interpreter.MyObject;
+    /**
+     * Throw an exception in the interpreter that can be handled by an
+     * interpreter try/catch statement.  If unhandled, a real exception will
+     * be thrown.  Can be called with either an error class and a message, or
+     * with an actual object to be thrown.
+     * @param {!Interpreter.MyObject} errorClass Type of error (if message is
+     *   provided) or the value to throw (if no message).
+     * @param {string=} opt_message Message being thrown.
+     */
+    throwException(errorClass: Interpreter.MyObject, opt_message?: string): void;
+    /**
+     * Throw an exception in the interpreter that can be handled by a
+     * interpreter try/catch statement.  If unhandled, a real exception will
+     * be thrown.
+     * @param {!Interpreter.MyObject} error Error object to execute.
+     */
+    executeException(error: Interpreter.MyObject): void;
+    /**
+     * Create a call to a getter function.
+     * @param {!Interpreter.MyObject} func Function to execute.
+     * @param {!Interpreter.MyObject|!Array} left
+     *     Name of variable or object/propname tuple.
+     * @private
+     */
+    createGetter_(func: Interpreter.MyObject, left: Interpreter.MyObject | Array<Interpreter.MyObject>): Interpreter.MyState;
+    /**
+     * Create a call to a setter function.
+     * @param {!Interpreter.MyObject} func Function to execute.
+     * @param {!Interpreter.MyObject|!Array} left
+     *     Name of variable or object/propname tuple.
+     * @param {Interpreter.MyValue} value Value to set.
+     * @private
+     */
+    createSetter_(func: Interpreter.MyObject, left: Interpreter.MyObject | Array<Interpreter.MyObject>, value: Interpreter.MyValue): Interpreter.MyState;
+    private stepArrayExpression(stack, state, node);
+    private stepAssignmentExpression(stack, state, node);
+    private stepBinaryExpression(stack, state, node);
+    private stepBlockStatement(stack, state, node);
+    private stepBreakStatement(stack, state, node);
+    private stepCallExpression(stack, state, node);
+    private stepCatchClause(stack, state, node);
+    private stepConditionalExpression(stack, state, node);
+    private stepContinueStatement(stack, state, node);
+    private stepDebuggerStatement(stack, state, node);
+    private stepDoWhileStatement(stack, state, node);
+    private stepEmptyStatement(stack, state, node);
+    private stepEvalProgram_(stack, state, node);
+    private stepExpressionStatement(stack, state, node);
+    private stepForInStatement(stack, state, node);
+    private stepForStatement(stack, state, node);
+    private stepFunctionDeclaration(stack, state, node);
+    private stepFunctionExpression(stack, state, node);
+    private stepIdentifier(stack, state, node);
+    private stepIfStatement(stack, state, node);
+    private stepLabeledStatement(stack, state, node);
+    private stepLiteral(stack, state, node);
+    private stepLogicalExpression(stack, state, node);
+    private stepMemberExpression(stack, state, node);
+    private stepNewExpression(stack, state, node);
+    private stepObjectExpression(stack, state, node);
+    private stepProgram(stack, state, node);
+    private stepReturnStatement(stack, state, node);
+    private stepSequenceExpression(stack, state, node);
+    private stepSwitchStatement(stack, state, node);
+    private stepThisExpression(stack, state, node);
+    private stepThrowStatement(stack, state, node);
+    private stepTryStatement(stack, state, node);
+    private stepUnaryExpression(stack, state, node);
+    private stepUpdateExpression(stack, state, node);
+    private stepVariableDeclaration(stack, state, node);
+    private stepWithStatement(stack, state, node);
+    private stepWhileStatement(stack, state, node);
+}
+declare module Interpreter {
+    /**
+     * Class for an object.
+     * @param {Interpreter.MyObject} proto Prototype object or null.
+     * @constructor
+     */
+    class MyObject {
+        [key: string]: any;
+        getter: any;
+        setter: any;
+        properties: any;
+        constructor(proto: any);
+        /** @type {Interpreter.MyObject} */
+        proto: Interpreter.MyObject;
+        /** @type {boolean} */
+        isObject: boolean;
+        /** @type {string} */
+        class: string;
+        /** @type {Date|RegExp|boolean|number|string|undefined|null} */
+        data: Date | RegExp | boolean | number | string | undefined | null;
+        /**
+         * Convert this object into a string.
+         * @return {string} String value.
+         * @override
+         */
+        toString(): string;
+        /**
+         * Return the object's value.
+         * @return {Interpreter.MyValue} Value.
+         * @override
+         */
+        valueOf(): string | number | boolean | this;
+    }
+    /**
+     * Typedef for JS values.
+     * @typedef {!Interpreter.MyObject|boolean|number|string|undefined|null}
+     */
+    type MyValue = MyObject | boolean | number | string | undefined | null;
+    /**
+     * Class for a state.
+     * @param {!MyObject} node AST node for the state.
+     * @param {!Interpreter.MyObject} scope Scope object for the state.
+     * @constructor
+     */
+    class MyState {
+        [key: string]: any;
+        node: ESTree.BaseNode;
+        scope: Interpreter.MyObject;
+        constructor(node: ESTree.BaseNode, scope: Interpreter.MyObject);
+    }
+    interface MyValueTable {
+        pseudo: MyValue[];
+        native: any[];
+    }
+    interface MyDescriptor {
+        get?: MyObject;
+        set?: MyObject;
+        configurable?: boolean;
+        enumerable?: boolean;
+        writable?: boolean;
+        value?: any;
+    }
+    interface Acorn {
+        parse(code: string, options?: any): ESTree.Program;
+    }
+    interface NodeConstructor {
+        new (): ESTree.BaseNode;
+    }
+    interface NativeFunction extends Function {
+        id?: number;
+    }
+}
+export = Interpreter;
diff --git a/dist/interpreter.global.js b/dist/interpreter.global.js
new file mode 100644
index 00000000..39483391
--- /dev/null
+++ b/dist/interpreter.global.js
@@ -0,0 +1,3333 @@
+var Interpreter =
+/******/ (function(modules) { // webpackBootstrap
+/******/ 	// The module cache
+/******/ 	var installedModules = {};
+/******/
+/******/ 	// The require function
+/******/ 	function __webpack_require__(moduleId) {
+/******/
+/******/ 		// Check if module is in cache
+/******/ 		if(installedModules[moduleId]) {
+/******/ 			return installedModules[moduleId].exports;
+/******/ 		}
+/******/ 		// Create a new module (and put it into the cache)
+/******/ 		var module = installedModules[moduleId] = {
+/******/ 			i: moduleId,
+/******/ 			l: false,
+/******/ 			exports: {}
+/******/ 		};
+/******/
+/******/ 		// Execute the module function
+/******/ 		modules[moduleId].call(module.exports, module, module.exports, __webpack_require__);
+/******/
+/******/ 		// Flag the module as loaded
+/******/ 		module.l = true;
+/******/
+/******/ 		// Return the exports of the module
+/******/ 		return module.exports;
+/******/ 	}
+/******/
+/******/
+/******/ 	// expose the modules object (__webpack_modules__)
+/******/ 	__webpack_require__.m = modules;
+/******/
+/******/ 	// expose the module cache
+/******/ 	__webpack_require__.c = installedModules;
+/******/
+/******/ 	// define getter function for harmony exports
+/******/ 	__webpack_require__.d = function(exports, name, getter) {
+/******/ 		if(!__webpack_require__.o(exports, name)) {
+/******/ 			Object.defineProperty(exports, name, {
+/******/ 				configurable: false,
+/******/ 				enumerable: true,
+/******/ 				get: getter
+/******/ 			});
+/******/ 		}
+/******/ 	};
+/******/
+/******/ 	// getDefaultExport function for compatibility with non-harmony modules
+/******/ 	__webpack_require__.n = function(module) {
+/******/ 		var getter = module && module.__esModule ?
+/******/ 			function getDefault() { return module['default']; } :
+/******/ 			function getModuleExports() { return module; };
+/******/ 		__webpack_require__.d(getter, 'a', getter);
+/******/ 		return getter;
+/******/ 	};
+/******/
+/******/ 	// Object.prototype.hasOwnProperty.call
+/******/ 	__webpack_require__.o = function(object, property) { return Object.prototype.hasOwnProperty.call(object, property); };
+/******/
+/******/ 	// __webpack_public_path__
+/******/ 	__webpack_require__.p = "";
+/******/
+/******/ 	// Load entry module and return exports
+/******/ 	return __webpack_require__(__webpack_require__.s = 0);
+/******/ })
+/************************************************************************/
+/******/ ([
+/* 0 */
+/***/ (function(module, exports, __webpack_require__) {
+
+/* WEBPACK VAR INJECTION */(function(global) {var __WEBPACK_AMD_DEFINE_ARRAY__, __WEBPACK_AMD_DEFINE_RESULT__;/// <reference path="./_estree.d.ts" />
+!(__WEBPACK_AMD_DEFINE_ARRAY__ = [__webpack_require__, exports], __WEBPACK_AMD_DEFINE_RESULT__ = function (require, exports) {
+    "use strict";
+    /**
+     * @license
+     * JavaScript Interpreter
+     *
+     * Copyright 2013-2017 Google Inc. and Jun Kato
+     *
+     * Licensed under the Apache License, Version 2.0 (the "License");
+     * you may not use this file except in compliance with the License.
+     * You may obtain a copy of the License at
+     *
+     *   http://www.apache.org/licenses/LICENSE-2.0
+     *
+     * Unless required by applicable law or agreed to in writing, software
+     * distributed under the License is distributed on an "AS IS" BASIS,
+     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     * See the License for the specific language governing permissions and
+     * limitations under the License.
+     */
+    /**
+     * @fileoverview Interpreting JavaScript in JavaScript.
+     * @author fraser@google.com (Neil Fraser)
+     * @author i@junkato.jp (Jun Kato)
+     */
+    /**
+     * Create a new interpreter.
+     * @param {string|!Object} code Raw JavaScript text or AST.
+     * @param {Function=} opt_initFunc Optional initialization function.  Used to
+     *     define APIs.  When called it is passed the interpreter object and the
+     *     global scope object.
+     * @constructor
+     */
+    var Interpreter = (function () {
+        function Interpreter(code, opt_initFunc) {
+            if (typeof code === 'string') {
+                code = Interpreter.acorn.parse(code, Interpreter.PARSE_OPTIONS);
+            }
+            this.ast = code;
+            this.initFunc_ = opt_initFunc;
+            this.paused_ = false;
+            this.polyfills_ = [];
+            // Unique identifier for native functions.  Used in serialization.
+            this.functionCounter_ = 0;
+            // Map node types to our step function names; a property lookup is faster
+            // than string concatenation with "step" prefix.
+            this.stepFunctions_ = Object.create(null);
+            var stepMatch = /^step([A-Z]\w*)$/;
+            var m;
+            var props = Object.getOwnPropertyNames(Interpreter.prototype);
+            for (var i = 0; i < props.length; i++) {
+                var methodName = props[i];
+                if ((typeof Interpreter.prototype[methodName] === 'function') &&
+                    (m = methodName.match(stepMatch))) {
+                    this.stepFunctions_[m[1]] = Interpreter.prototype[methodName].bind(this);
+                }
+            }
+            // Create and initialize the global scope.
+            this.global = this.createScope(this.ast, null);
+            // Run the polyfills.
+            this.ast = Interpreter.acorn.parse(this.polyfills_.join('\n'), Interpreter.PARSE_OPTIONS);
+            this.polyfills_ = undefined; // Allow polyfill strings to garbage collect.
+            this.stripLocations_(this.ast, undefined, undefined);
+            var state = new Interpreter.MyState(this.ast, this.global);
+            state.done = false;
+            this.stateStack = [state];
+            this.run();
+            this.value = undefined;
+            // Point at the main program.
+            this.ast = code;
+            var state = new Interpreter.MyState(this.ast, this.global);
+            state.done = false;
+            this.stateStack.length = 0;
+            this.stateStack[0] = state;
+            // Get a handle on Acorn's node_t object.  It's tricky to access.
+            this.nodeConstructor = state.node.constructor;
+            // Preserve publicly properties from being pruned/renamed by JS compilers.
+            // Add others as needed.
+            this['stateStack'] = this.stateStack;
+            this['OBJECT'] = this.OBJECT;
+            this['OBJECT_PROTO'] = this.OBJECT_PROTO;
+            this['FUNCTION'] = this.FUNCTION;
+            this['FUNCTION_PROTO'] = this.FUNCTION_PROTO;
+            this['ARRAY'] = this.ARRAY;
+            this['ARRAY_PROTO'] = this.ARRAY_PROTO;
+            this['REGEXP'] = this.REGEXP;
+            this['REGEXP_PROTO'] = this.REGEXP_PROTO;
+            // The following properties are obsolete.  Do not use.
+            this['UNDEFINED'] = undefined;
+            this['NULL'] = null;
+            this['NAN'] = NaN;
+            this['TRUE'] = true;
+            this['FALSE'] = false;
+            this['STRING_EMPTY'] = '';
+            this['NUMBER_ZERO'] = 0;
+            this['NUMBER_ONE'] = 1;
+        }
+        ;
+        /**
+         * Add more code to the interpreter.
+         * @param {string|!Object} code Raw JavaScript text or AST.
+         */
+        Interpreter.prototype.appendCode = function (code) {
+            var state = this.stateStack[0];
+            if (!state || state.node['type'] !== 'Program') {
+                throw Error('Expecting original AST to start with a Program node.');
+            }
+            if (typeof code === 'string') {
+                code = Interpreter.acorn.parse(code, Interpreter.PARSE_OPTIONS);
+            }
+            if (!code || code['type'] !== 'Program') {
+                throw Error('Expecting new AST to start with a Program node.');
+            }
+            this.populateScope_(code, state.scope);
+            // Append the new program to the old one.
+            for (var i = 0, node; (node = code['body'][i]); i++) {
+                state.node['body'].push(node);
+            }
+            state.done = false;
+        };
+        ;
+        /**
+         * Execute one step of the interpreter.
+         * @return {boolean} True if a step was executed, false if no more instructions.
+         */
+        Interpreter.prototype.step = function () {
+            var stack = this.stateStack;
+            var state = stack[stack.length - 1];
+            if (!state) {
+                return false;
+            }
+            var node = state.node, type = node['type'];
+            if (type === 'Program' && state.done) {
+                return false;
+            }
+            else if (this.paused_) {
+                return true;
+            }
+            try {
+                var nextState = this.stepFunctions_[type](stack, state, node);
+            }
+            catch (e) {
+                // Eat any step errors.  They have been thrown on the stack.
+                if (e !== Interpreter.STEP_ERROR) {
+                    // Uh oh.  This is a real error in the JS-Interpreter.  Rethrow.
+                    throw e;
+                }
+            }
+            if (nextState) {
+                stack.push(nextState);
+            }
+            if (!node['end']) {
+                // This is polyfill code.  Keep executing until we arrive at user code.
+                return this.step();
+            }
+            return true;
+        };
+        ;
+        /**
+         * Execute the interpreter to program completion.  Vulnerable to infinite loops.
+         * @return {boolean} True if a execution is asynchronously blocked,
+         *     false if no more instructions.
+         */
+        Interpreter.prototype.run = function () {
+            while (!this.paused_ && this.step()) { }
+            return this.paused_;
+        };
+        ;
+        /**
+         * Initialize the global scope with buitin properties and functions.
+         * @param {!Interpreter.MyObject} scope Global scope.
+         */
+        Interpreter.prototype.initGlobalScope = function (scope) {
+            // Initialize uneditable global properties.
+            this.setProperty(scope, 'NaN', NaN, Interpreter.READONLY_DESCRIPTOR);
+            this.setProperty(scope, 'Infinity', Infinity, Interpreter.READONLY_DESCRIPTOR);
+            this.setProperty(scope, 'undefined', undefined, Interpreter.READONLY_DESCRIPTOR);
+            this.setProperty(scope, 'window', scope, Interpreter.READONLY_DESCRIPTOR);
+            this.setProperty(scope, 'this', scope, Interpreter.READONLY_DESCRIPTOR);
+            this.setProperty(scope, 'self', scope); // Editable.
+            // Create the objects which will become Object.prototype and
+            // Function.prototype, which are needed to bootstrap everything else.
+            this.OBJECT_PROTO = new Interpreter.MyObject(null);
+            this.FUNCTION_PROTO = new Interpreter.MyObject(this.OBJECT_PROTO);
+            // Initialize global objects.
+            this.initFunction(scope);
+            this.initObject(scope);
+            // Unable to set scope's parent prior (OBJECT did not exist).
+            // Note that in a browser this would be 'Window', whereas in Node.js it would
+            // be 'Object'.  This interpreter is closer to Node in that it has no DOM.
+            scope.proto = this.OBJECT_PROTO;
+            this.setProperty(scope, 'constructor', this.OBJECT);
+            this.initArray(scope);
+            this.initString(scope);
+            this.initBoolean(scope);
+            this.initNumber(scope);
+            this.initDate(scope);
+            this.initRegExp(scope);
+            this.initError(scope);
+            this.initMath(scope);
+            this.initJSON(scope);
+            // Initialize global functions.
+            var thisInterpreter = this;
+            var func = this.createNativeFunction(function (x) { throw EvalError("Can't happen"); }, false);
+            func.eval = true;
+            this.setProperty(scope, 'eval', func);
+            this.setProperty(scope, 'parseInt', this.createNativeFunction(parseInt, false));
+            this.setProperty(scope, 'parseFloat', this.createNativeFunction(parseFloat, false));
+            this.setProperty(scope, 'isNaN', this.createNativeFunction(isNaN, false));
+            this.setProperty(scope, 'isFinite', this.createNativeFunction(isFinite, false));
+            var strFunctions = [
+                [escape, 'escape'], [unescape, 'unescape'],
+                [decodeURI, 'decodeURI'], [decodeURIComponent, 'decodeURIComponent'],
+                [encodeURI, 'encodeURI'], [encodeURIComponent, 'encodeURIComponent']
+            ];
+            for (var i = 0; i < strFunctions.length; i++) {
+                var wrapper = (function (nativeFunc) {
+                    return function (str) {
+                        try {
+                            return nativeFunc(str);
+                        }
+                        catch (e) {
+                            // decodeURI('%xy') will throw an error.  Catch and rethrow.
+                            thisInterpreter.throwException(thisInterpreter.URI_ERROR, e.message);
+                        }
+                    };
+                })(strFunctions[i][0]);
+                this.setProperty(scope, strFunctions[i][1], this.createNativeFunction(wrapper, false), Interpreter.NONENUMERABLE_DESCRIPTOR);
+            }
+            // Run any user-provided initialization.
+            if (this.initFunc_) {
+                this.initFunc_(this, scope);
+            }
+        };
+        ;
+        /**
+         * Initialize the Function class.
+         * @param {!Interpreter.MyObject} scope Global scope.
+         */
+        Interpreter.prototype.initFunction = function (scope) {
+            var thisInterpreter = this;
+            var wrapper;
+            var identifierRegexp = /^[A-Za-z_$][\w$]*$/;
+            // Function constructor.
+            wrapper = function (var_args) {
+                if (thisInterpreter.calledWithNew()) {
+                    // Called as new Function().
+                    var newFunc = this;
+                }
+                else {
+                    // Called as Function().
+                    var newFunc = thisInterpreter.createObjectProto(thisInterpreter.FUNCTION_PROTO);
+                }
+                if (arguments.length) {
+                    var code = String(arguments[arguments.length - 1]);
+                }
+                else {
+                    var code = '';
+                }
+                var args = [];
+                for (var i = 0; i < arguments.length - 1; i++) {
+                    var name = String(arguments[i]);
+                    if (!name.match(identifierRegexp)) {
+                        thisInterpreter.throwException(thisInterpreter.SYNTAX_ERROR, 'Invalid function argument: ' + name);
+                    }
+                    args.push(name);
+                }
+                args = args.join(', ');
+                // Interestingly, the scope for constructed functions is the global scope,
+                // even if they were constructed in some other scope.
+                newFunc.parentScope = thisInterpreter.global;
+                // Acorn needs to parse code in the context of a function or else 'return'
+                // statements will be syntax errors.
+                try {
+                    var ast = Interpreter.acorn.parse('$ = function(' + args + ') {' + code + '};', Interpreter.PARSE_OPTIONS);
+                }
+                catch (e) {
+                    // Acorn threw a SyntaxError.  Rethrow as a trappable error.
+                    thisInterpreter.throwException(thisInterpreter.SYNTAX_ERROR, 'Invalid code: ' + e.message);
+                }
+                if (ast['body'].length !== 1) {
+                    // Function('a', 'return a + 6;}; {alert(1);');
+                    thisInterpreter.throwException(thisInterpreter.SYNTAX_ERROR, 'Invalid code in function body.');
+                }
+                newFunc.node = ast['body'][0]['expression']['right'];
+                thisInterpreter.setProperty(newFunc, 'length', newFunc.node['length'], Interpreter.READONLY_DESCRIPTOR);
+                return newFunc;
+            };
+            wrapper.id = this.functionCounter_++;
+            this.FUNCTION = this.createObjectProto(this.FUNCTION_PROTO);
+            this.setProperty(scope, 'Function', this.FUNCTION);
+            // Manually setup type and prototype because createObj doesn't recognize
+            // this object as a function (this.FUNCTION did not exist).
+            this.setProperty(this.FUNCTION, 'prototype', this.FUNCTION_PROTO);
+            this.FUNCTION.nativeFunc = wrapper;
+            // Configure Function.prototype.
+            this.setProperty(this.FUNCTION_PROTO, 'constructor', this.FUNCTION, Interpreter.NONENUMERABLE_DESCRIPTOR);
+            this.FUNCTION_PROTO.nativeFunc = function () { };
+            this.FUNCTION_PROTO.nativeFunc.id = this.functionCounter_++;
+            this.setProperty(this.FUNCTION_PROTO, 'length', 0, Interpreter.READONLY_DESCRIPTOR);
+            var boxThis = function (value) {
+                // In non-strict mode 'this' must be an object.
+                if ((!value || !value.isObject) && !thisInterpreter.getScope().strict) {
+                    if (value === undefined || value === null) {
+                        // 'Undefined' and 'null' are changed to global object.
+                        value = thisInterpreter.global;
+                    }
+                    else {
+                        // Primitives must be boxed in non-strict mode.
+                        var box = thisInterpreter.createObjectProto(thisInterpreter.getPrototype(value));
+                        box.data = value;
+                        value = box;
+                    }
+                }
+                return value;
+            };
+            wrapper = function (thisArg, args) {
+                var state = thisInterpreter.stateStack[thisInterpreter.stateStack.length - 1];
+                // Rewrite the current 'CallExpression' to apply a different function.
+                state.func_ = this;
+                // Assign the 'this' object.
+                state.funcThis_ = boxThis(thisArg);
+                // Bind any provided arguments.
+                state.arguments_ = [];
+                if (args !== null && args !== undefined) {
+                    if (args.isObject) {
+                        state.arguments_ = thisInterpreter.pseudoToNative(args);
+                    }
+                    else {
+                        thisInterpreter.throwException(thisInterpreter.TYPE_ERROR, 'CreateListFromArrayLike called on non-object');
+                    }
+                }
+                state.doneExec_ = false;
+            };
+            this.setNativeFunctionPrototype(this.FUNCTION, 'apply', wrapper);
+            wrapper = function (thisArg, var_args) {
+                var state = thisInterpreter.stateStack[thisInterpreter.stateStack.length - 1];
+                // Rewrite the current 'CallExpression' to call a different function.
+                state.func_ = this;
+                // Assign the 'this' object.
+                state.funcThis_ = boxThis(thisArg);
+                // Bind any provided arguments.
+                state.arguments_ = [];
+                for (var i = 1; i < arguments.length; i++) {
+                    state.arguments_.push(arguments[i]);
+                }
+                state.doneExec_ = false;
+            };
+            this.setNativeFunctionPrototype(this.FUNCTION, 'call', wrapper);
+            this.polyfills_.push(
+            // Polyfill copied from:
+            // developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_objects/Function/bind
+            "Object.defineProperty(Function.prototype, 'bind',", "{configurable: true, writable: true, value:", "function(oThis) {", "if (typeof this !== 'function') {", "throw TypeError('What is trying to be bound is not callable');", "}", "var aArgs   = Array.prototype.slice.call(arguments, 1),", "fToBind = this,", "fNOP    = function() {},", "fBound  = function() {", "return fToBind.apply(this instanceof fNOP", "? this", ": oThis,", "aArgs.concat(Array.prototype.slice.call(arguments)));", "};", "if (this.prototype) {", "fNOP.prototype = this.prototype;", "}", "fBound.prototype = new fNOP();", "return fBound;", "}", "});", "");
+            // Function has no parent to inherit from, so it needs its own mandatory
+            // toString and valueOf functions.
+            wrapper = function () {
+                return this.toString();
+            };
+            this.setNativeFunctionPrototype(this.FUNCTION, 'toString', wrapper);
+            this.setProperty(this.FUNCTION, 'toString', this.createNativeFunction(wrapper, false), Interpreter.NONENUMERABLE_DESCRIPTOR);
+            wrapper = function () {
+                return this.valueOf();
+            };
+            this.setNativeFunctionPrototype(this.FUNCTION, 'valueOf', wrapper);
+            this.setProperty(this.FUNCTION, 'valueOf', this.createNativeFunction(wrapper, false), Interpreter.NONENUMERABLE_DESCRIPTOR);
+        };
+        ;
+        /**
+         * Initialize the Object class.
+         * @param {!Interpreter.MyObject} scope Global scope.
+         */
+        Interpreter.prototype.initObject = function (scope) {
+            var thisInterpreter = this;
+            var wrapper;
+            // Object constructor.
+            wrapper = function (value) {
+                if (value === undefined || value === null) {
+                    // Create a new object.
+                    if (thisInterpreter.calledWithNew()) {
+                        // Called as new Object().
+                        return this;
+                    }
+                    else {
+                        // Called as Object().
+                        return thisInterpreter.createObjectProto(thisInterpreter.OBJECT_PROTO);
+                    }
+                }
+                if (!value.isObject) {
+                    // Wrap the value as an object.
+                    var box = thisInterpreter.createObjectProto(thisInterpreter.getPrototype(value));
+                    box.data = value;
+                    return box;
+                }
+                // Return the provided object.
+                return value;
+            };
+            this.OBJECT = this.createNativeFunction(wrapper, true);
+            // Throw away the created prototype and use the root prototype.
+            this.setProperty(this.OBJECT, 'prototype', this.OBJECT_PROTO);
+            this.setProperty(this.OBJECT_PROTO, 'constructor', this.OBJECT);
+            this.setProperty(scope, 'Object', this.OBJECT);
+            /**
+             * Checks if the provided value is null or undefined.
+             * If so, then throw an error in the call stack.
+             * @param {Interpreter.MyValue} value Value to check.
+             */
+            var throwIfNullUndefined = function (value) {
+                if (value === undefined || value === null) {
+                    thisInterpreter.throwException(thisInterpreter.TYPE_ERROR, "Cannot convert '" + value + "' to object");
+                }
+            };
+            // Static methods on Object.
+            wrapper = function (obj) {
+                throwIfNullUndefined(obj);
+                var props = obj.isObject ? obj.properties : obj;
+                return thisInterpreter.nativeToPseudo(Object.getOwnPropertyNames(props));
+            };
+            this.setProperty(this.OBJECT, 'getOwnPropertyNames', this.createNativeFunction(wrapper, false), Interpreter.NONENUMERABLE_DESCRIPTOR);
+            wrapper = function (obj) {
+                throwIfNullUndefined(obj);
+                if (!obj.isObject) {
+                    return thisInterpreter.nativeToPseudo(Object.keys(obj));
+                }
+                return thisInterpreter.nativeToPseudo(Object.keys(obj.properties));
+            };
+            this.setProperty(this.OBJECT, 'keys', this.createNativeFunction(wrapper, false), Interpreter.NONENUMERABLE_DESCRIPTOR);
+            wrapper = function (proto) {
+                // Support for the second argument is the responsibility of a polyfill.
+                if (proto === null) {
+                    return thisInterpreter.createObjectProto(null);
+                }
+                if (proto === undefined || !proto.isObject) {
+                    thisInterpreter.throwException(thisInterpreter.TYPE_ERROR, 'Object prototype may only be an Object or null');
+                }
+                return thisInterpreter.createObjectProto(proto);
+            };
+            this.setProperty(this.OBJECT, 'create', this.createNativeFunction(wrapper, false), Interpreter.NONENUMERABLE_DESCRIPTOR);
+            // Add a polyfill to handle create's second argument.
+            this.polyfills_.push("(function() {", "var create_ = Object.create;", "Object.create = function(proto, props) {", "var obj = create_(proto);", "props && Object.defineProperties(obj, props);", "return obj;", "};", "})();", "");
+            wrapper = function (obj, prop, descriptor) {
+                prop = String(prop);
+                if (!obj || !obj.isObject) {
+                    thisInterpreter.throwException(thisInterpreter.TYPE_ERROR, 'Object.defineProperty called on non-object');
+                }
+                if (!descriptor || !descriptor.isObject) {
+                    thisInterpreter.throwException(thisInterpreter.TYPE_ERROR, 'Property description must be an object');
+                }
+                if (!obj.properties[prop] && obj.preventExtensions) {
+                    thisInterpreter.throwException(thisInterpreter.TYPE_ERROR, "Can't define property '" + prop + "', object is not extensible");
+                }
+                // The polyfill guarantees no inheritance and no getter functions.
+                // Therefore the descriptor properties map is the native object needed.
+                thisInterpreter.setProperty(obj, prop, ReferenceError, descriptor.properties);
+                return obj;
+            };
+            this.setProperty(this.OBJECT, 'defineProperty', this.createNativeFunction(wrapper, false), Interpreter.NONENUMERABLE_DESCRIPTOR);
+            this.polyfills_.push(
+            // Flatten the descriptor to remove any inheritance or getter functions.
+            "(function() {", "var defineProperty_ = Object.defineProperty;", "Object.defineProperty = function(obj, prop, d1) {", "var d2 = {};", "if ('configurable' in d1) d2.configurable = d1.configurable;", "if ('enumerable' in d1) d2.enumerable = d1.enumerable;", "if ('writable' in d1) d2.writable = d1.writable;", "if ('value' in d1) d2.value = d1.value;", "if ('get' in d1) d2.get = d1.get;", "if ('set' in d1) d2.set = d1.set;", "return defineProperty_(obj, prop, d2);", "};", "})();", "Object.defineProperty(Object, 'defineProperties',", "{configurable: true, writable: true, value:", "function(obj, props) {", "var keys = Object.keys(props);", "for (var i = 0; i < keys.length; i++) {", "Object.defineProperty(obj, keys[i], props[keys[i]]);", "}", "return obj;", "}", "});", "");
+            wrapper = function (obj, prop) {
+                if (!obj || !obj.isObject) {
+                    thisInterpreter.throwException(thisInterpreter.TYPE_ERROR, 'Object.getOwnPropertyDescriptor called on non-object');
+                }
+                prop = String(prop);
+                if (!(prop in obj.properties)) {
+                    return undefined;
+                }
+                var descriptor = Object.getOwnPropertyDescriptor(obj.properties, prop);
+                var getter = obj.getter[prop];
+                var setter = obj.setter[prop];
+                if (getter || setter) {
+                    descriptor.get = getter;
+                    descriptor.set = setter;
+                    delete descriptor.value;
+                    delete descriptor.writable;
+                }
+                var pseudoDescriptor = thisInterpreter.nativeToPseudo(descriptor);
+                if ('value' in descriptor) {
+                    thisInterpreter.setProperty(pseudoDescriptor, 'value', descriptor.value);
+                }
+                return pseudoDescriptor;
+            };
+            this.setProperty(this.OBJECT, 'getOwnPropertyDescriptor', this.createNativeFunction(wrapper, false), Interpreter.NONENUMERABLE_DESCRIPTOR);
+            wrapper = function (obj) {
+                throwIfNullUndefined(obj);
+                return thisInterpreter.getPrototype(obj);
+            };
+            this.setProperty(this.OBJECT, 'getPrototypeOf', this.createNativeFunction(wrapper, false), Interpreter.NONENUMERABLE_DESCRIPTOR);
+            wrapper = function (obj) {
+                return Boolean(obj) && !obj.preventExtensions;
+            };
+            this.setProperty(this.OBJECT, 'isExtensible', this.createNativeFunction(wrapper, false), Interpreter.NONENUMERABLE_DESCRIPTOR);
+            wrapper = function (obj) {
+                if (obj && obj.isObject) {
+                    obj.preventExtensions = true;
+                }
+                return obj;
+            };
+            this.setProperty(this.OBJECT, 'preventExtensions', this.createNativeFunction(wrapper, false), Interpreter.NONENUMERABLE_DESCRIPTOR);
+            // Instance methods on Object.
+            this.setNativeFunctionPrototype(this.OBJECT, 'toString', Interpreter.MyObject.prototype.toString);
+            this.setNativeFunctionPrototype(this.OBJECT, 'toLocaleString', Interpreter.MyObject.prototype.toString);
+            this.setNativeFunctionPrototype(this.OBJECT, 'valueOf', Interpreter.MyObject.prototype.valueOf);
+            wrapper = function (prop) {
+                throwIfNullUndefined(this);
+                if (!this.isObject) {
+                    return this.hasOwnProperty(prop);
+                }
+                return String(prop) in this.properties;
+            };
+            this.setNativeFunctionPrototype(this.OBJECT, 'hasOwnProperty', wrapper);
+            wrapper = function (prop) {
+                throwIfNullUndefined(this);
+                return Object.prototype.propertyIsEnumerable.call(this.properties, prop);
+            };
+            this.setNativeFunctionPrototype(this.OBJECT, 'propertyIsEnumerable', wrapper);
+            wrapper = function (obj) {
+                while (true) {
+                    // Note, circular loops shouldn't be possible.
+                    obj = thisInterpreter.getPrototype(obj);
+                    if (!obj) {
+                        // No parent; reached the top.
+                        return false;
+                    }
+                    if (obj === this) {
+                        return true;
+                    }
+                }
+            };
+            this.setNativeFunctionPrototype(this.OBJECT, 'isPrototypeOf', wrapper);
+        };
+        ;
+        /**
+         * Initialize the Array class.
+         * @param {!Interpreter.MyObject} scope Global scope.
+         */
+        Interpreter.prototype.initArray = function (scope) {
+            var thisInterpreter = this;
+            var getInt = function (obj, def) {
+                // Return an integer, or the default.
+                var n = obj ? Math.floor(obj) : def;
+                if (isNaN(n)) {
+                    n = def;
+                }
+                return n;
+            };
+            var wrapper;
+            // Array constructor.
+            wrapper = function (var_args) {
+                if (thisInterpreter.calledWithNew()) {
+                    // Called as new Array().
+                    var newArray = this;
+                }
+                else {
+                    // Called as Array().
+                    var newArray = thisInterpreter.createObjectProto(thisInterpreter.ARRAY_PROTO);
+                }
+                var first = arguments[0];
+                if (arguments.length === 1 && typeof first === 'number') {
+                    if (isNaN(Interpreter.legalArrayLength(first))) {
+                        thisInterpreter.throwException(thisInterpreter.RANGE_ERROR, 'Invalid array length');
+                    }
+                    newArray.properties.length = first;
+                }
+                else {
+                    for (var i = 0; i < arguments.length; i++) {
+                        newArray.properties[i] = arguments[i];
+                    }
+                    newArray.properties.length = i;
+                }
+                return newArray;
+            };
+            this.ARRAY = this.createNativeFunction(wrapper, true);
+            this.ARRAY_PROTO = this.ARRAY.properties['prototype'];
+            this.setProperty(scope, 'Array', this.ARRAY);
+            // Static methods on Array.
+            wrapper = function (obj) {
+                return obj && obj.class === 'Array';
+            };
+            this.setProperty(this.ARRAY, 'isArray', this.createNativeFunction(wrapper, false), Interpreter.NONENUMERABLE_DESCRIPTOR);
+            // Instance methods on Array.
+            wrapper = function () {
+                return Array.prototype.pop.call(this.properties);
+            };
+            this.setNativeFunctionPrototype(this.ARRAY, 'pop', wrapper);
+            wrapper = function (var_args) {
+                return Array.prototype.push.apply(this.properties, arguments);
+            };
+            this.setNativeFunctionPrototype(this.ARRAY, 'push', wrapper);
+            wrapper = function () {
+                return Array.prototype.shift.call(this.properties);
+            };
+            this.setNativeFunctionPrototype(this.ARRAY, 'shift', wrapper);
+            wrapper = function (var_args) {
+                return Array.prototype.unshift.apply(this.properties, arguments);
+            };
+            this.setNativeFunctionPrototype(this.ARRAY, 'unshift', wrapper);
+            wrapper = function () {
+                Array.prototype.reverse.call(this.properties);
+                return this;
+            };
+            this.setNativeFunctionPrototype(this.ARRAY, 'reverse', wrapper);
+            wrapper = function (index, howmany /*, var_args*/) {
+                var list = Array.prototype.splice.apply(this.properties, arguments);
+                return thisInterpreter.nativeToPseudo(list);
+            };
+            this.setNativeFunctionPrototype(this.ARRAY, 'splice', wrapper);
+            wrapper = function (opt_begin, opt_end) {
+                var list = Array.prototype.slice.call(this.properties, opt_begin, opt_end);
+                return thisInterpreter.nativeToPseudo(list);
+            };
+            this.setNativeFunctionPrototype(this.ARRAY, 'slice', wrapper);
+            wrapper = function (opt_separator) {
+                return Array.prototype.join.call(this.properties, opt_separator);
+            };
+            this.setNativeFunctionPrototype(this.ARRAY, 'join', wrapper);
+            wrapper = function (var_args) {
+                var list = [];
+                var length = 0;
+                // Start by copying the current array.
+                var iLength = thisInterpreter.getProperty(this, 'length');
+                for (var i = 0; i < iLength; i++) {
+                    if (thisInterpreter.hasProperty(this, i)) {
+                        var element = thisInterpreter.getProperty(this, i);
+                        list[length] = element;
+                    }
+                    length++;
+                }
+                // Loop through all arguments and copy them in.
+                for (var i = 0; i < arguments.length; i++) {
+                    var value = arguments[i];
+                    if (thisInterpreter.isa(value, thisInterpreter.ARRAY)) {
+                        var jLength = thisInterpreter.getProperty(value, 'length');
+                        for (var j = 0; j < jLength; j++) {
+                            if (thisInterpreter.hasProperty(value, j)) {
+                                list[length] = thisInterpreter.getProperty(value, j);
+                            }
+                            length++;
+                        }
+                    }
+                    else {
+                        list[length] = value;
+                    }
+                }
+                return thisInterpreter.nativeToPseudo(list);
+            };
+            this.setNativeFunctionPrototype(this.ARRAY, 'concat', wrapper);
+            wrapper = function (searchElement, opt_fromIndex) {
+                return Array.prototype.indexOf.apply(this.properties, arguments);
+            };
+            this.setNativeFunctionPrototype(this.ARRAY, 'indexOf', wrapper);
+            wrapper = function (searchElement, opt_fromIndex) {
+                return Array.prototype.lastIndexOf.apply(this.properties, arguments);
+            };
+            this.setNativeFunctionPrototype(this.ARRAY, 'lastIndexOf', wrapper);
+            wrapper = function () {
+                Array.prototype.sort.call(this.properties);
+                return this;
+            };
+            this.setNativeFunctionPrototype(this.ARRAY, 'sort', wrapper);
+            this.polyfills_.push(
+            // Polyfill copied from:
+            // developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Array/every
+            "Object.defineProperty(Array.prototype, 'every',", "{configurable: true, writable: true, value:", "function(callbackfn, thisArg) {", "if (!this || typeof callbackfn !== 'function') throw TypeError();", "var T, k;", "var O = Object(this);", "var len = O.length >>> 0;", "if (arguments.length > 1) T = thisArg;", "k = 0;", "while (k < len) {", "if (k in O && !callbackfn.call(T, O[k], k, O)) return false;", "k++;", "}", "return true;", "}", "});", 
+            // Polyfill copied from:
+            // developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Array/filter
+            "Object.defineProperty(Array.prototype, 'filter',", "{configurable: true, writable: true, value:", "function(fun/*, thisArg*/) {", "if (this === void 0 || this === null || typeof fun !== 'function') throw TypeError();", "var t = Object(this);", "var len = t.length >>> 0;", "var res = [];", "var thisArg = arguments.length >= 2 ? arguments[1] : void 0;", "for (var i = 0; i < len; i++) {", "if (i in t) {", "var val = t[i];", "if (fun.call(thisArg, val, i, t)) res.push(val);", "}", "}", "return res;", "}", "});", 
+            // Polyfill copied from:
+            // developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Array/forEach
+            "Object.defineProperty(Array.prototype, 'forEach',", "{configurable: true, writable: true, value:", "function(callback, thisArg) {", "if (!this || typeof callback !== 'function') throw TypeError();", "var T, k;", "var O = Object(this);", "var len = O.length >>> 0;", "if (arguments.length > 1) T = thisArg;", "k = 0;", "while (k < len) {", "if (k in O) callback.call(T, O[k], k, O);", "k++;", "}", "}", "});", 
+            // Polyfill copied from:
+            // developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Array/map
+            "Object.defineProperty(Array.prototype, 'map',", "{configurable: true, writable: true, value:", "function(callback, thisArg) {", "if (!this || typeof callback !== 'function') new TypeError;", "var T, A, k;", "var O = Object(this);", "var len = O.length >>> 0;", "if (arguments.length > 1) T = thisArg;", "A = new Array(len);", "k = 0;", "while (k < len) {", "if (k in O) A[k] = callback.call(T, O[k], k, O);", "k++;", "}", "return A;", "}", "});", 
+            // Polyfill copied from:
+            // developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Array/Reduce
+            "Object.defineProperty(Array.prototype, 'reduce',", "{configurable: true, writable: true, value:", "function(callback /*, initialValue*/) {", "if (!this || typeof callback !== 'function') throw TypeError();", "var t = Object(this), len = t.length >>> 0, k = 0, value;", "if (arguments.length === 2) {", "value = arguments[1];", "} else {", "while (k < len && !(k in t)) k++;", "if (k >= len) {", "throw TypeError('Reduce of empty array with no initial value');", "}", "value = t[k++];", "}", "for (; k < len; k++) {", "if (k in t) value = callback(value, t[k], k, t);", "}", "return value;", "}", "});", 
+            // Polyfill copied from:
+            // developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Array/ReduceRight
+            "Object.defineProperty(Array.prototype, 'reduceRight',", "{configurable: true, writable: true, value:", "function(callback /*, initialValue*/) {", "if (null === this || 'undefined' === typeof this || 'function' !== typeof callback) throw TypeError();", "var t = Object(this), len = t.length >>> 0, k = len - 1, value;", "if (arguments.length >= 2) {", "value = arguments[1];", "} else {", "while (k >= 0 && !(k in t)) k--;", "if (k < 0) {", "throw TypeError('Reduce of empty array with no initial value');", "}", "value = t[k--];", "}", "for (; k >= 0; k--) {", "if (k in t) value = callback(value, t[k], k, t);", "}", "return value;", "}", "});", 
+            // Polyfill copied from:
+            // developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Array/some
+            "Object.defineProperty(Array.prototype, 'some',", "{configurable: true, writable: true, value:", "function(fun/*, thisArg*/) {", "if (!this || typeof fun !== 'function') throw TypeError();", "var t = Object(this);", "var len = t.length >>> 0;", "var thisArg = arguments.length >= 2 ? arguments[1] : void 0;", "for (var i = 0; i < len; i++) {", "if (i in t && fun.call(thisArg, t[i], i, t)) {", "return true;", "}", "}", "return false;", "}", "});", "(function() {", "var sort_ = Array.prototype.sort;", "Array.prototype.sort = function(opt_comp) {", 
+            // Fast native sort.
+            "if (typeof opt_comp !== 'function') {", "return sort_.call(this);", "}", 
+            // Slow bubble sort.
+            "for (var i = 0; i < this.length; i++) {", "var changes = 0;", "for (var j = 0; j < this.length - i - 1; j++) {", "if (opt_comp(this[j], this[j + 1]) > 0) {", "var swap = this[j];", "this[j] = this[j + 1];", "this[j + 1] = swap;", "changes++;", "}", "}", "if (!changes) break;", "}", "return this;", "};", "})();", "Object.defineProperty(Array.prototype, 'toLocaleString',", "{configurable: true, writable: true, value:", "function() {", "var out = [];", "for (var i = 0; i < this.length; i++) {", "out[i] = (this[i] === null || this[i] === undefined) ? '' : this[i].toLocaleString();", "}", "return out.join(',');", "}", "});", "");
+        };
+        ;
+        /**
+         * Initialize the String class.
+         * @param {!Interpreter.MyObject} scope Global scope.
+         */
+        Interpreter.prototype.initString = function (scope) {
+            var thisInterpreter = this;
+            var wrapper;
+            // String constructor.
+            wrapper = function (value) {
+                value = String(value);
+                if (thisInterpreter.calledWithNew()) {
+                    // Called as new String().
+                    this.data = value;
+                    return this;
+                }
+                else {
+                    // Called as String().
+                    return value;
+                }
+            };
+            this.STRING = this.createNativeFunction(wrapper, true);
+            this.setProperty(scope, 'String', this.STRING);
+            // Static methods on String.
+            this.setProperty(this.STRING, 'fromCharCode', this.createNativeFunction(String.fromCharCode, false), Interpreter.NONENUMERABLE_DESCRIPTOR);
+            // Instance methods on String.
+            // Methods with exclusively primitive arguments.
+            var functions = ['trim', 'toLowerCase', 'toUpperCase',
+                'toLocaleLowerCase', 'toLocaleUpperCase', 'charAt', 'charCodeAt',
+                'substring', 'slice', 'substr', 'indexOf', 'lastIndexOf', 'concat'];
+            for (var i = 0; i < functions.length; i++) {
+                this.setNativeFunctionPrototype(this.STRING, functions[i], String.prototype[functions[i]]);
+            }
+            wrapper = function (compareString, locales, options) {
+                locales = locales ? thisInterpreter.pseudoToNative(locales) : undefined;
+                options = options ? thisInterpreter.pseudoToNative(options) : undefined;
+                return String(this).localeCompare(compareString, locales, options);
+            };
+            this.setNativeFunctionPrototype(this.STRING, 'localeCompare', wrapper);
+            wrapper = function (separator, limit) {
+                if (thisInterpreter.isa(separator, thisInterpreter.REGEXP)) {
+                    separator = separator.data;
+                }
+                var jsList = String(this).split(separator, limit);
+                return thisInterpreter.nativeToPseudo(jsList);
+            };
+            this.setNativeFunctionPrototype(this.STRING, 'split', wrapper);
+            wrapper = function (regexp) {
+                regexp = regexp ? regexp.data : undefined;
+                var match = String(this).match(regexp);
+                if (!match) {
+                    return null;
+                }
+                return thisInterpreter.nativeToPseudo(match);
+            };
+            this.setNativeFunctionPrototype(this.STRING, 'match', wrapper);
+            wrapper = function (regexp) {
+                if (thisInterpreter.isa(regexp, thisInterpreter.REGEXP)) {
+                    regexp = regexp.data;
+                }
+                return String(this).search(regexp);
+            };
+            this.setNativeFunctionPrototype(this.STRING, 'search', wrapper);
+            wrapper = function (substr, newSubstr) {
+                // Support for function replacements is the responsibility of a polyfill.
+                return String(this).replace(substr.data || substr, newSubstr);
+            };
+            this.setNativeFunctionPrototype(this.STRING, 'replace', wrapper);
+            // Add a polyfill to handle replace's second argument being a function.
+            this.polyfills_.push("(function() {", "var replace_ = String.prototype.replace;", "String.prototype.replace = function(substr, newSubstr) {", "if (typeof newSubstr !== 'function') {", 
+            // string.replace(string|regexp, string)
+            "return replace_.call(this, substr, newSubstr);", "}", "var str = this;", "if (substr instanceof RegExp) {", // string.replace(regexp, function)
+            "var subs = [];", "var m = substr.exec(str);", "while (m) {", "m.push(m.index, str);", "var inject = newSubstr.apply(null, m);", "subs.push([m.index, m[0].length, inject]);", "m = substr.global ? substr.exec(str) : null;", "}", "for (var i = subs.length - 1; i >= 0; i--) {", "str = str.substring(0, subs[i][0]) + subs[i][2] + " +
+                "str.substring(subs[i][0] + subs[i][1]);", "}", "} else {", // string.replace(string, function)
+            "var i = str.indexOf(substr);", "if (i !== -1) {", "var inject = newSubstr(str.substr(i, substr.length), i, str);", "str = str.substring(0, i) + inject + " +
+                "str.substring(i + substr.length);", "}", "}", "return str;", "};", "})();", "");
+        };
+        ;
+        /**
+         * Initialize the Boolean class.
+         * @param {!Interpreter.MyObject} scope Global scope.
+         */
+        Interpreter.prototype.initBoolean = function (scope) {
+            var thisInterpreter = this;
+            var wrapper;
+            // Boolean constructor.
+            wrapper = function (value) {
+                value = Boolean(value);
+                if (thisInterpreter.calledWithNew()) {
+                    // Called as new Boolean().
+                    this.data = value;
+                    return this;
+                }
+                else {
+                    // Called as Boolean().
+                    return value;
+                }
+            };
+            this.BOOLEAN = this.createNativeFunction(wrapper, true);
+            this.setProperty(scope, 'Boolean', this.BOOLEAN);
+        };
+        ;
+        /**
+         * Initialize the Number class.
+         * @param {!Interpreter.MyObject} scope Global scope.
+         */
+        Interpreter.prototype.initNumber = function (scope) {
+            var thisInterpreter = this;
+            var wrapper;
+            // Number constructor.
+            wrapper = function (value) {
+                value = Number(value);
+                if (thisInterpreter.calledWithNew()) {
+                    // Called as new Number().
+                    this.data = value;
+                    return this;
+                }
+                else {
+                    // Called as Number().
+                    return value;
+                }
+            };
+            this.NUMBER = this.createNativeFunction(wrapper, true);
+            this.setProperty(scope, 'Number', this.NUMBER);
+            var numConsts = ['MAX_VALUE', 'MIN_VALUE', 'NaN', 'NEGATIVE_INFINITY',
+                'POSITIVE_INFINITY'];
+            for (var i = 0; i < numConsts.length; i++) {
+                this.setProperty(this.NUMBER, numConsts[i], Number[numConsts[i]], Interpreter.READONLY_NONENUMERABLE_DESCRIPTOR);
+            }
+            // Instance methods on Number.
+            wrapper = function (fractionDigits) {
+                try {
+                    return Number(this).toExponential(fractionDigits);
+                }
+                catch (e) {
+                    // Throws if fractionDigits isn't within 0-20.
+                    thisInterpreter.throwException(thisInterpreter.ERROR, e.message);
+                }
+            };
+            this.setNativeFunctionPrototype(this.NUMBER, 'toExponential', wrapper);
+            wrapper = function (digits) {
+                try {
+                    return Number(this).toFixed(digits);
+                }
+                catch (e) {
+                    // Throws if digits isn't within 0-20.
+                    thisInterpreter.throwException(thisInterpreter.ERROR, e.message);
+                }
+            };
+            this.setNativeFunctionPrototype(this.NUMBER, 'toFixed', wrapper);
+            wrapper = function (precision) {
+                try {
+                    return Number(this).toPrecision(precision);
+                }
+                catch (e) {
+                    // Throws if precision isn't within range (depends on implementation).
+                    thisInterpreter.throwException(thisInterpreter.ERROR, e.message);
+                }
+            };
+            this.setNativeFunctionPrototype(this.NUMBER, 'toPrecision', wrapper);
+            wrapper = function (radix) {
+                try {
+                    return Number(this).toString(radix);
+                }
+                catch (e) {
+                    // Throws if radix isn't within 2-36.
+                    thisInterpreter.throwException(thisInterpreter.ERROR, e.message);
+                }
+            };
+            this.setNativeFunctionPrototype(this.NUMBER, 'toString', wrapper);
+            wrapper = function (locales, options) {
+                locales = locales ? thisInterpreter.pseudoToNative(locales) : undefined;
+                options = options ? thisInterpreter.pseudoToNative(options) : undefined;
+                return Number(this).toLocaleString(locales, options);
+            };
+            this.setNativeFunctionPrototype(this.NUMBER, 'toLocaleString', wrapper);
+        };
+        ;
+        /**
+         * Initialize the Date class.
+         * @param {!Interpreter.MyObject} scope Global scope.
+         */
+        Interpreter.prototype.initDate = function (scope) {
+            var thisInterpreter = this;
+            var wrapper;
+            // Date constructor.
+            wrapper = function (value, var_args) {
+                if (!thisInterpreter.calledWithNew()) {
+                    // Called as Date().
+                    // Calling Date() as a function returns a string, no arguments are heeded.
+                    return Date();
+                }
+                // Called as new Date().
+                var args = [null].concat([].slice.call(arguments));
+                this.data = new (Function.prototype.bind.apply(Date, args));
+                return this;
+            };
+            this.DATE = this.createNativeFunction(wrapper, true);
+            this.setProperty(scope, 'Date', this.DATE);
+            // Static methods on Date.
+            this.setProperty(this.DATE, 'now', this.createNativeFunction(Date.now, false), Interpreter.NONENUMERABLE_DESCRIPTOR);
+            this.setProperty(this.DATE, 'parse', this.createNativeFunction(Date.parse, false), Interpreter.NONENUMERABLE_DESCRIPTOR);
+            this.setProperty(this.DATE, 'UTC', this.createNativeFunction(Date.UTC, false), Interpreter.NONENUMERABLE_DESCRIPTOR);
+            // Instance methods on Date.
+            var functions = ['getDate', 'getDay', 'getFullYear', 'getHours',
+                'getMilliseconds', 'getMinutes', 'getMonth', 'getSeconds', 'getTime',
+                'getTimezoneOffset', 'getUTCDate', 'getUTCDay', 'getUTCFullYear',
+                'getUTCHours', 'getUTCMilliseconds', 'getUTCMinutes', 'getUTCMonth',
+                'getUTCSeconds', 'getYear',
+                'setDate', 'setFullYear', 'setHours', 'setMilliseconds',
+                'setMinutes', 'setMonth', 'setSeconds', 'setTime', 'setUTCDate',
+                'setUTCFullYear', 'setUTCHours', 'setUTCMilliseconds', 'setUTCMinutes',
+                'setUTCMonth', 'setUTCSeconds', 'setYear',
+                'toDateString', 'toISOString', 'toJSON', 'toGMTString',
+                'toLocaleDateString', 'toLocaleString', 'toLocaleTimeString',
+                'toTimeString', 'toUTCString'];
+            for (var i = 0; i < functions.length; i++) {
+                wrapper = (function (nativeFunc) {
+                    return function (var_args) {
+                        var args = [];
+                        for (var i = 0; i < arguments.length; i++) {
+                            args[i] = thisInterpreter.pseudoToNative(arguments[i]);
+                        }
+                        return this.data[nativeFunc].apply(this.data, args);
+                    };
+                })(functions[i]);
+                this.setNativeFunctionPrototype(this.DATE, functions[i], wrapper);
+            }
+        };
+        ;
+        /**
+         * Initialize Regular Expression object.
+         * @param {!Interpreter.MyObject} scope Global scope.
+         */
+        Interpreter.prototype.initRegExp = function (scope) {
+            var thisInterpreter = this;
+            var wrapper;
+            // RegExp constructor.
+            wrapper = function (pattern, flags) {
+                if (thisInterpreter.calledWithNew()) {
+                    // Called as new RegExp().
+                    var rgx = this;
+                }
+                else {
+                    // Called as RegExp().
+                    var rgx = thisInterpreter.createObjectProto(thisInterpreter.REGEXP_PROTO);
+                }
+                pattern = pattern ? pattern.toString() : '';
+                flags = flags ? flags.toString() : '';
+                thisInterpreter.populateRegExp(rgx, new RegExp(pattern, flags));
+                return rgx;
+            };
+            this.REGEXP = this.createNativeFunction(wrapper, true);
+            this.REGEXP_PROTO = this.REGEXP.properties['prototype'];
+            this.setProperty(scope, 'RegExp', this.REGEXP);
+            this.setProperty(this.REGEXP.properties['prototype'], 'global', undefined, Interpreter.READONLY_NONENUMERABLE_DESCRIPTOR);
+            this.setProperty(this.REGEXP.properties['prototype'], 'ignoreCase', undefined, Interpreter.READONLY_NONENUMERABLE_DESCRIPTOR);
+            this.setProperty(this.REGEXP.properties['prototype'], 'multiline', undefined, Interpreter.READONLY_NONENUMERABLE_DESCRIPTOR);
+            this.setProperty(this.REGEXP.properties['prototype'], 'source', '(?:)', Interpreter.READONLY_NONENUMERABLE_DESCRIPTOR);
+            wrapper = function (str) {
+                return this.data.test(str);
+            };
+            this.setNativeFunctionPrototype(this.REGEXP, 'test', wrapper);
+            wrapper = function (str) {
+                str = str.toString();
+                // Get lastIndex from wrapped regex, since this is settable.
+                this.data.lastIndex =
+                    Number(thisInterpreter.getProperty(this, 'lastIndex'));
+                var match = this.data.exec(str);
+                thisInterpreter.setProperty(this, 'lastIndex', this.data.lastIndex);
+                if (match) {
+                    var result = thisInterpreter.createObjectProto(thisInterpreter.ARRAY_PROTO);
+                    for (var i = 0; i < match.length; i++) {
+                        thisInterpreter.setProperty(result, i, match[i]);
+                    }
+                    // match has additional properties.
+                    thisInterpreter.setProperty(result, 'index', match.index);
+                    thisInterpreter.setProperty(result, 'input', match.input);
+                    return result;
+                }
+                return null;
+            };
+            this.setNativeFunctionPrototype(this.REGEXP, 'exec', wrapper);
+        };
+        ;
+        /**
+         * Initialize the Error class.
+         * @param {!Interpreter.MyObject} scope Global scope.
+         */
+        Interpreter.prototype.initError = function (scope) {
+            var thisInterpreter = this;
+            // Error constructor.
+            this.ERROR = this.createNativeFunction(function (opt_message) {
+                if (thisInterpreter.calledWithNew()) {
+                    // Called as new Error().
+                    var newError = this;
+                }
+                else {
+                    // Called as Error().
+                    var newError = thisInterpreter.createObject(thisInterpreter.ERROR);
+                }
+                if (opt_message) {
+                    thisInterpreter.setProperty(newError, 'message', String(opt_message), Interpreter.NONENUMERABLE_DESCRIPTOR);
+                }
+                return newError;
+            }, true);
+            this.setProperty(scope, 'Error', this.ERROR);
+            this.setProperty(this.ERROR.properties['prototype'], 'message', '', Interpreter.NONENUMERABLE_DESCRIPTOR);
+            this.setProperty(this.ERROR.properties['prototype'], 'name', 'Error', Interpreter.NONENUMERABLE_DESCRIPTOR);
+            var createErrorSubclass = function (name) {
+                var constructor = thisInterpreter.createNativeFunction(function (opt_message) {
+                    if (thisInterpreter.calledWithNew()) {
+                        // Called as new XyzError().
+                        var newError = this;
+                    }
+                    else {
+                        // Called as XyzError().
+                        var newError = thisInterpreter.createObject(constructor);
+                    }
+                    if (opt_message) {
+                        thisInterpreter.setProperty(newError, 'message', String(opt_message), Interpreter.NONENUMERABLE_DESCRIPTOR);
+                    }
+                    return newError;
+                }, true);
+                thisInterpreter.setProperty(constructor, 'prototype', thisInterpreter.createObject(thisInterpreter.ERROR));
+                thisInterpreter.setProperty(constructor.properties['prototype'], 'name', name, Interpreter.NONENUMERABLE_DESCRIPTOR);
+                thisInterpreter.setProperty(scope, name, constructor);
+                return constructor;
+            };
+            this.EVAL_ERROR = createErrorSubclass('EvalError');
+            this.RANGE_ERROR = createErrorSubclass('RangeError');
+            this.REFERENCE_ERROR = createErrorSubclass('ReferenceError');
+            this.SYNTAX_ERROR = createErrorSubclass('SyntaxError');
+            this.TYPE_ERROR = createErrorSubclass('TypeError');
+            this.URI_ERROR = createErrorSubclass('URIError');
+        };
+        ;
+        /**
+         * Initialize Math object.
+         * @param {!Interpreter.MyObject} scope Global scope.
+         */
+        Interpreter.prototype.initMath = function (scope) {
+            var thisInterpreter = this;
+            var myMath = this.createObjectProto(this.OBJECT_PROTO);
+            this.setProperty(scope, 'Math', myMath);
+            var mathConsts = ['E', 'LN2', 'LN10', 'LOG2E', 'LOG10E', 'PI',
+                'SQRT1_2', 'SQRT2'];
+            for (var i = 0; i < mathConsts.length; i++) {
+                this.setProperty(myMath, mathConsts[i], Math[mathConsts[i]], Interpreter.READONLY_NONENUMERABLE_DESCRIPTOR);
+            }
+            var numFunctions = ['abs', 'acos', 'asin', 'atan', 'atan2', 'ceil', 'cos',
+                'exp', 'floor', 'log', 'max', 'min', 'pow', 'random',
+                'round', 'sin', 'sqrt', 'tan'];
+            for (var i = 0; i < numFunctions.length; i++) {
+                this.setProperty(myMath, numFunctions[i], this.createNativeFunction(Math[numFunctions[i]], false), Interpreter.NONENUMERABLE_DESCRIPTOR);
+            }
+        };
+        ;
+        /**
+         * Initialize JSON object.
+         * @param {!Interpreter.MyObject} scope Global scope.
+         */
+        Interpreter.prototype.initJSON = function (scope) {
+            var thisInterpreter = this;
+            var myJSON = thisInterpreter.createObjectProto(this.OBJECT_PROTO);
+            this.setProperty(scope, 'JSON', myJSON);
+            var wrapper = function (text) {
+                try {
+                    var nativeObj = JSON.parse(text.toString());
+                }
+                catch (e) {
+                    thisInterpreter.throwException(thisInterpreter.SYNTAX_ERROR, e.message);
+                }
+                return thisInterpreter.nativeToPseudo(nativeObj);
+            };
+            this.setProperty(myJSON, 'parse', this.createNativeFunction(wrapper, false));
+            wrapper = function (value) {
+                var nativeObj = thisInterpreter.pseudoToNative(value);
+                try {
+                    var str = JSON.stringify(nativeObj);
+                }
+                catch (e) {
+                    thisInterpreter.throwException(thisInterpreter.TYPE_ERROR, e.message);
+                }
+                return str;
+            };
+            this.setProperty(myJSON, 'stringify', this.createNativeFunction(wrapper, false));
+        };
+        ;
+        /**
+         * Is an object of a certain class?
+         * @param {Interpreter.MyValue} child Object to check.
+         * @param {Interpreter.MyObject} constructor Constructor of object.
+         * @return {boolean} True if object is the class or inherits from it.
+         *     False otherwise.
+         */
+        Interpreter.prototype.isa = function (child, constructor) {
+            if (child === null || child === undefined || !constructor) {
+                return false;
+            }
+            var proto = constructor.properties['prototype'];
+            if (child === proto) {
+                return true;
+            }
+            // The first step up the prototype chain is harder since the child might be
+            // a primitive value.  Subsequent steps can just follow the .proto property.
+            var childObj = this.getPrototype(child);
+            while (childObj) {
+                if (childObj === proto) {
+                    return true;
+                }
+                childObj = childObj.proto;
+            }
+            return false;
+        };
+        ;
+        /**
+         * Is a value a legal integer for an array length?
+         * @param {Interpreter.MyValue} x Value to check.
+         * @return {number} Zero, or a positive integer if the value can be
+         *     converted to such.  NaN otherwise.
+         */
+        Interpreter.legalArrayLength = function (x) {
+            var n = x >>> 0;
+            // Array length must be between 0 and 2^32-1 (inclusive).
+            return (n === Number(x)) ? n : NaN;
+        };
+        ;
+        /**
+         * Is a value a legal integer for an array index?
+         * @param {Interpreter.MyValue} x Value to check.
+         * @return {number} Zero, or a positive integer if the value can be
+         *     converted to such.  NaN otherwise.
+         */
+        Interpreter.legalArrayIndex = function (x) {
+            var n = x >>> 0;
+            // Array index cannot be 2^32-1, otherwise length would be 2^32.
+            // 0xffffffff is 2^32-1.
+            return (String(n) === String(x) && n !== 0xffffffff) ? n : NaN;
+        };
+        ;
+        /**
+         * Create a new data object based on a constructor's prototype.
+         * @param {Interpreter.MyObject} constructor Parent constructor function,
+         *     or null if scope object.
+         * @return {!Interpreter.MyObject} New data object.
+         */
+        Interpreter.prototype.createObject = function (constructor) {
+            return this.createObjectProto(constructor &&
+                constructor.properties['prototype']);
+        };
+        ;
+        /**
+         * Create a new data object based on a prototype.
+         * @param {Interpreter.MyObject} proto Prototype object.
+         * @return {!Interpreter.MyObject} New data object.
+         */
+        Interpreter.prototype.createObjectProto = function (proto) {
+            var obj = new Interpreter.MyObject(proto);
+            // Functions have prototype objects.
+            if (this.isa(obj, this.FUNCTION)) {
+                this.setProperty(obj, 'prototype', this.createObjectProto(this.OBJECT_PROTO || null));
+                obj.class = 'Function';
+            }
+            // Arrays have length.
+            if (this.isa(obj, this.ARRAY)) {
+                this.setProperty(obj, 'length', 0, { configurable: false, enumerable: false, writable: true });
+                obj.class = 'Array';
+            }
+            if (this.isa(obj, this.ERROR)) {
+                obj.class = 'Error';
+            }
+            return obj;
+        };
+        ;
+        /**
+         * Initialize a pseudo regular expression object based on a native regular
+         * expression object.
+         * @param {!Interpreter.MyObject} pseudoRegexp The existing object to set.
+         * @param {!RegExp} nativeRegexp The native regular expression.
+         */
+        Interpreter.prototype.populateRegExp = function (pseudoRegexp, nativeRegexp) {
+            pseudoRegexp.data = nativeRegexp;
+            // lastIndex is settable, all others are read-only attributes
+            this.setProperty(pseudoRegexp, 'lastIndex', nativeRegexp.lastIndex, Interpreter.NONENUMERABLE_DESCRIPTOR);
+            this.setProperty(pseudoRegexp, 'source', nativeRegexp.source, Interpreter.READONLY_NONENUMERABLE_DESCRIPTOR);
+            this.setProperty(pseudoRegexp, 'global', nativeRegexp.global, Interpreter.READONLY_NONENUMERABLE_DESCRIPTOR);
+            this.setProperty(pseudoRegexp, 'ignoreCase', nativeRegexp.ignoreCase, Interpreter.READONLY_NONENUMERABLE_DESCRIPTOR);
+            this.setProperty(pseudoRegexp, 'multiline', nativeRegexp.multiline, Interpreter.READONLY_NONENUMERABLE_DESCRIPTOR);
+        };
+        ;
+        /**
+         * Create a new function.
+         * @param {!Object} node AST node defining the function.
+         * @param {!Object} scope Parent scope.
+         * @return {!Interpreter.MyObject} New function.
+         */
+        Interpreter.prototype.createFunction = function (node, scope) {
+            var func = this.createObjectProto(this.FUNCTION_PROTO);
+            func.parentScope = scope;
+            func.node = node;
+            this.setProperty(func, 'length', func.node['params'].length, Interpreter.READONLY_DESCRIPTOR);
+            return func;
+        };
+        ;
+        /**
+         * Create a new native function.
+         * @param {!Function} nativeFunc JavaScript function.
+         * @param {boolean=} opt_constructor If true, the function's
+         * prototype will have its constructor property set to the function.
+         * If false, the function cannot be called as a constructor (e.g. escape).
+         * Defaults to undefined.
+         * @return {!Interpreter.MyObject} New function.
+         */
+        Interpreter.prototype.createNativeFunction = function (nativeFunc, opt_constructor) {
+            var func = this.createObjectProto(this.FUNCTION_PROTO);
+            func.nativeFunc = nativeFunc;
+            nativeFunc.id = this.functionCounter_++;
+            this.setProperty(func, 'length', nativeFunc.length, Interpreter.READONLY_DESCRIPTOR);
+            if (opt_constructor) {
+                this.setProperty(func.properties['prototype'], 'constructor', func, Interpreter.NONENUMERABLE_DESCRIPTOR);
+            }
+            else if (opt_constructor === false) {
+                func.illegalConstructor = true;
+                this.setProperty(func, 'prototype', undefined);
+            }
+            return func;
+        };
+        ;
+        /**
+         * Create a new native asynchronous function.
+         * @param {!Function} asyncFunc JavaScript function.
+         * @return {!Interpreter.MyObject} New function.
+         */
+        Interpreter.prototype.createAsyncFunction = function (asyncFunc) {
+            var func = this.createObjectProto(this.FUNCTION_PROTO);
+            func.asyncFunc = asyncFunc;
+            asyncFunc.id = this.functionCounter_++;
+            this.setProperty(func, 'length', asyncFunc.length, Interpreter.READONLY_DESCRIPTOR);
+            return func;
+        };
+        ;
+        /**
+         * Converts from a native JS object or value to a JS interpreter object.
+         * Can handle JSON-style values.
+         * @param {*} nativeObj The native JS object to be converted.
+         * @return {Interpreter.MyValue} The equivalent JS interpreter object.
+         */
+        Interpreter.prototype.nativeToPseudo = function (nativeObj) {
+            if (typeof nativeObj === 'boolean' ||
+                typeof nativeObj === 'number' ||
+                typeof nativeObj === 'string' ||
+                nativeObj === null || nativeObj === undefined) {
+                return nativeObj;
+            }
+            if (nativeObj instanceof RegExp) {
+                var pseudoRegexp = this.createObjectProto(this.REGEXP_PROTO);
+                this.populateRegExp(pseudoRegexp, nativeObj);
+                return pseudoRegexp;
+            }
+            if (nativeObj instanceof Function) {
+                var interpreter = this;
+                var wrapper = function () {
+                    return interpreter.nativeToPseudo(nativeObj.apply(interpreter, Array.prototype.slice.call(arguments)
+                        .map(function (i) {
+                        return interpreter.pseudoToNative(i);
+                    })));
+                };
+                return this.createNativeFunction(wrapper, undefined);
+            }
+            var pseudoObj;
+            if (Array.isArray(nativeObj)) {
+                pseudoObj = this.createObjectProto(this.ARRAY_PROTO);
+                for (var i = 0; i < nativeObj.length; i++) {
+                    if (i in nativeObj) {
+                        this.setProperty(pseudoObj, i, this.nativeToPseudo(nativeObj[i]));
+                    }
+                }
+            }
+            else {
+                pseudoObj = this.createObjectProto(this.OBJECT_PROTO);
+                for (var key in nativeObj) {
+                    this.setProperty(pseudoObj, key, this.nativeToPseudo(nativeObj[key]));
+                }
+            }
+            return pseudoObj;
+        };
+        ;
+        /**
+         * Converts from a JS interpreter object to native JS object.
+         * Can handle JSON-style values, plus cycles.
+         * @param {Interpreter.MyValue} pseudoObj The JS interpreter object to be
+         * converted.
+         * @param {Object=} opt_cycles Cycle detection (used in recursive calls).
+         * @return {*} The equivalent native JS object or value.
+         */
+        Interpreter.prototype.pseudoToNative = function (pseudoObj, opt_cycles) {
+            if (typeof pseudoObj === 'boolean' ||
+                typeof pseudoObj === 'number' ||
+                typeof pseudoObj === 'string' ||
+                pseudoObj === null || pseudoObj === undefined) {
+                return pseudoObj;
+            }
+            if (this.isa(pseudoObj, this.REGEXP)) {
+                return pseudoObj.data;
+            }
+            var cycles = opt_cycles || {
+                pseudo: [],
+                native: []
+            };
+            var i = cycles.pseudo.indexOf(pseudoObj);
+            if (i !== -1) {
+                return cycles.native[i];
+            }
+            cycles.pseudo.push(pseudoObj);
+            var nativeObj;
+            if (this.isa(pseudoObj, this.ARRAY)) {
+                nativeObj = [];
+                cycles.native.push(nativeObj);
+                var length = this.getProperty(pseudoObj, 'length');
+                for (var i = 0; i < length; i++) {
+                    if (this.hasProperty(pseudoObj, i)) {
+                        nativeObj[i] =
+                            this.pseudoToNative(this.getProperty(pseudoObj, i), cycles);
+                    }
+                }
+            }
+            else {
+                nativeObj = {};
+                cycles.native.push(nativeObj);
+                var val;
+                for (var key in pseudoObj.properties) {
+                    val = pseudoObj.properties[key];
+                    nativeObj[key] = this.pseudoToNative(val, cycles);
+                }
+            }
+            cycles.pseudo.pop();
+            cycles.native.pop();
+            return nativeObj;
+        };
+        ;
+        /**
+         * Look up the prototype for this value.
+         * @param {Interpreter.MyValue} value Data object.
+         * @return {Interpreter.MyObject} Prototype object, null if none.
+         */
+        Interpreter.prototype.getPrototype = function (value) {
+            switch (typeof value) {
+                case 'number':
+                    return this.NUMBER.properties['prototype'];
+                case 'boolean':
+                    return this.BOOLEAN.properties['prototype'];
+                case 'string':
+                    return this.STRING.properties['prototype'];
+            }
+            if (value) {
+                return value.proto;
+            }
+            return null;
+        };
+        ;
+        /**
+         * Fetch a property value from a data object.
+         * @param {Interpreter.MyValue} obj Data object.
+         * @param {Interpreter.MyValue} name Name of property.
+         * @return {Interpreter.MyValue} Property value (may be undefined).
+         */
+        Interpreter.prototype.getProperty = function (obj, name) {
+            name = String(name);
+            if (obj === undefined || obj === null) {
+                this.throwException(this.TYPE_ERROR, "Cannot read property '" + name + "' of " + obj);
+            }
+            if (name === 'length') {
+                // Special cases for magic length property.
+                if (this.isa(obj, this.STRING)) {
+                    return String(obj).length;
+                }
+            }
+            else if (name.charCodeAt(0) < 0x40) {
+                // Might have numbers in there?
+                // Special cases for string array indexing
+                if (this.isa(obj, this.STRING)) {
+                    var n = Interpreter.legalArrayIndex(name);
+                    if (!isNaN(n) && n < String(obj).length) {
+                        return String(obj)[n];
+                    }
+                }
+            }
+            do {
+                var myObj = obj;
+                if (myObj.properties && name in myObj.properties) {
+                    var getter = myObj.getter[name];
+                    if (getter) {
+                        // Flag this function as being a getter and thus needing immediate
+                        // execution (rather than being the value of the property).
+                        getter.isGetter = true;
+                        return getter;
+                    }
+                    return myObj.properties[name];
+                }
+            } while ((obj = this.getPrototype(obj)));
+            return undefined;
+        };
+        ;
+        /**
+         * Does the named property exist on a data object.
+         * @param {Interpreter.MyValue} obj Data object.
+         * @param {Interpreter.MyValue} name Name of property.
+         * @return {boolean} True if property exists.
+         */
+        Interpreter.prototype.hasProperty = function (obj, name) {
+            if (!obj['isObject']) {
+                throw TypeError('Primitive data type has no properties');
+            }
+            name = String(name);
+            if (name === 'length' && this.isa(obj, this.STRING)) {
+                return true;
+            }
+            if (this.isa(obj, this.STRING)) {
+                var n = Interpreter.legalArrayIndex(name);
+                if (!isNaN(n) && n < String(obj).length) {
+                    return true;
+                }
+            }
+            do {
+                var myObj = obj;
+                if (myObj.properties && name in myObj.properties) {
+                    return true;
+                }
+            } while ((obj = this.getPrototype(obj)));
+            return false;
+        };
+        ;
+        /**
+         * Set a property value on a data object.
+         * @param {!Interpreter.MyObject} obj Data object.
+         * @param {Interpreter.MyValue} name Name of property.
+         * @param {Interpreter.MyValue|ReferenceError} value New property value.
+         *   Use ReferenceError if value is handled by descriptor instead.
+         * @param {Object=} opt_descriptor Optional descriptor object.
+         * @return {!Interpreter.MyObject|undefined} Returns a setter function if one
+         *     needs to be called, otherwise undefined.
+         */
+        Interpreter.prototype.setProperty = function (obj, name, value, opt_descriptor) {
+            name = String(name);
+            if (obj === undefined || obj === null) {
+                this.throwException(this.TYPE_ERROR, "Cannot set property '" + name + "' of " + obj);
+            }
+            if (opt_descriptor && ('get' in opt_descriptor || 'set' in opt_descriptor) &&
+                ('value' in opt_descriptor || 'writable' in opt_descriptor)) {
+                this.throwException(this.TYPE_ERROR, 'Invalid property descriptor. ' +
+                    'Cannot both specify accessors and a value or writable attribute');
+            }
+            var strict = !this.stateStack || this.getScope().strict;
+            if (!obj.isObject) {
+                if (strict) {
+                    this.throwException(this.TYPE_ERROR, "Can't create property '" + name +
+                        "' on '" + obj + "'");
+                }
+                return;
+            }
+            if (this.isa(obj, this.STRING)) {
+                var n = Interpreter.legalArrayIndex(name);
+                if (name === 'length' || (!isNaN(n) && n < String(obj).length)) {
+                    // Can't set length or letters on String objects.
+                    if (strict) {
+                        this.throwException(this.TYPE_ERROR, "Cannot assign to read only " +
+                            "property '" + name + "' of String '" + obj.data + "'");
+                    }
+                    return;
+                }
+            }
+            if (obj.class === 'Array') {
+                // Arrays have a magic length variable that is bound to the elements.
+                var length = obj.properties.length;
+                var i;
+                if (name === 'length') {
+                    // Delete elements if length is smaller.
+                    value = Interpreter.legalArrayLength(value);
+                    if (isNaN(value)) {
+                        this.throwException(this.RANGE_ERROR, 'Invalid array length');
+                    }
+                    if (value < length) {
+                        for (i in obj.properties) {
+                            i = Interpreter.legalArrayIndex(i);
+                            if (!isNaN(i) && value <= i) {
+                                delete obj.properties[i];
+                            }
+                        }
+                    }
+                }
+                else if (!isNaN(i = Interpreter.legalArrayIndex(name))) {
+                    // Increase length if this index is larger.
+                    obj.properties.length = Math.max(length, i + 1);
+                }
+            }
+            if (obj.preventExtensions && !(name in obj.properties)) {
+                if (strict) {
+                    this.throwException(this.TYPE_ERROR, "Can't add property '" + name +
+                        "', object is not extensible");
+                }
+                return;
+            }
+            if (opt_descriptor) {
+                // Define the property.
+                if ('get' in opt_descriptor) {
+                    if (opt_descriptor.get) {
+                        obj.getter[name] = opt_descriptor.get;
+                    }
+                    else {
+                        delete obj.getter[name];
+                    }
+                }
+                if ('set' in opt_descriptor) {
+                    if (opt_descriptor.set) {
+                        obj.setter[name] = opt_descriptor.set;
+                    }
+                    else {
+                        delete obj.setter[name];
+                    }
+                }
+                var descriptor = {};
+                if ('configurable' in opt_descriptor) {
+                    descriptor.configurable = opt_descriptor.configurable;
+                }
+                if ('enumerable' in opt_descriptor) {
+                    descriptor.enumerable = opt_descriptor.enumerable;
+                }
+                if ('writable' in opt_descriptor) {
+                    descriptor.writable = opt_descriptor.writable;
+                    delete obj.getter[name];
+                    delete obj.setter[name];
+                }
+                if ('value' in opt_descriptor) {
+                    descriptor.value = opt_descriptor.value;
+                    delete obj.getter[name];
+                    delete obj.setter[name];
+                }
+                else if (value !== ReferenceError) {
+                    descriptor.value = value;
+                    delete obj.getter[name];
+                    delete obj.setter[name];
+                }
+                try {
+                    Object.defineProperty(obj.properties, name, descriptor);
+                }
+                catch (e) {
+                    this.throwException(this.TYPE_ERROR, 'Cannot redefine property: ' + name);
+                }
+            }
+            else {
+                // Set the property.
+                if (value === ReferenceError) {
+                    throw ReferenceError('Value not specified.');
+                }
+                // Determine the parent (possibly self) where the property is defined.
+                var defObj = obj;
+                while (!(name in defObj.properties)) {
+                    defObj = this.getPrototype(defObj);
+                    if (!defObj) {
+                        // This is a new property.
+                        defObj = obj;
+                        break;
+                    }
+                }
+                if (defObj.setter && defObj.setter[name]) {
+                    return defObj.setter[name];
+                }
+                if (defObj.getter && defObj.getter[name]) {
+                    if (strict) {
+                        this.throwException(this.TYPE_ERROR, "Cannot set property '" + name +
+                            "' of object '" + obj + "' which only has a getter");
+                    }
+                }
+                else {
+                    // No setter, simple assignment.
+                    try {
+                        obj.properties[name] = value;
+                    }
+                    catch (e) {
+                        if (strict) {
+                            this.throwException(this.TYPE_ERROR, "Cannot assign to read only " +
+                                "property '" + name + "' of object '" + obj + "'");
+                        }
+                    }
+                }
+            }
+        };
+        ;
+        /**
+         * Convenience method for adding a native function as a non-enumerable property
+         * onto an object's prototype.
+         * @param {!Interpreter.MyObject} obj Data object.
+         * @param {Interpreter.MyValue} name Name of property.
+         * @param {!Function} wrapper Function object.
+         */
+        Interpreter.prototype.setNativeFunctionPrototype = function (obj, name, wrapper) {
+            this.setProperty(obj.properties['prototype'], name, this.createNativeFunction(wrapper, false), Interpreter.NONENUMERABLE_DESCRIPTOR);
+        };
+        ;
+        /**
+         * Returns the current scope from the stateStack.
+         * @return {!Interpreter.MyObject} Current scope dictionary.
+         */
+        Interpreter.prototype.getScope = function () {
+            var scope = this.stateStack[this.stateStack.length - 1].scope;
+            if (!scope) {
+                throw Error('No scope found.');
+            }
+            return scope;
+        };
+        ;
+        /**
+         * Create a new scope dictionary.
+         * @param {!Object} node AST node defining the scope container
+         *     (e.g. a function).
+         * @param {Interpreter.MyObject} parentScope Scope to link to.
+         * @return {!Interpreter.MyObject} New scope.
+         */
+        Interpreter.prototype.createScope = function (node, parentScope) {
+            var scope = this.createObjectProto(null);
+            scope.parentScope = parentScope;
+            if (!parentScope) {
+                this.initGlobalScope(scope);
+            }
+            this.populateScope_(node, scope);
+            // Determine if this scope starts with 'use strict'.
+            scope.strict = false;
+            if (parentScope && parentScope.strict) {
+                scope.strict = true;
+            }
+            else {
+                var firstNode = node['body'] && node['body'][0];
+                if (firstNode && firstNode.expression &&
+                    firstNode.expression['type'] === 'Literal' &&
+                    firstNode.expression.value === 'use strict') {
+                    scope.strict = true;
+                }
+            }
+            return scope;
+        };
+        ;
+        /**
+         * Create a new special scope dictionary. Similar to createScope(), but
+         * doesn't assume that the scope is for a function body.
+         * This is used for 'catch' clauses and 'with' statements.
+         * @param {!Interpreter.MyObject} parentScope Scope to link to.
+         * @param {Interpreter.MyObject=} opt_scope Optional object to transform into
+         *     scope.
+         * @return {!Interpreter.MyObject} New scope.
+         */
+        Interpreter.prototype.createSpecialScope = function (parentScope, opt_scope) {
+            if (!parentScope) {
+                throw Error('parentScope required');
+            }
+            var scope = opt_scope || this.createObjectProto(null);
+            scope.parentScope = parentScope;
+            scope.strict = parentScope.strict;
+            return scope;
+        };
+        ;
+        /**
+         * Retrieves a value from the scope chain.
+         * @param {string} name Name of variable.
+         * @return {Interpreter.MyValue} Any value.
+         *   May be flagged as being a getter and thus needing immediate execution
+         *   (rather than being the value of the property).
+         */
+        Interpreter.prototype.getValueFromScope = function (name) {
+            var scope = this.getScope();
+            while (scope && scope !== this.global) {
+                if (name in scope.properties) {
+                    return scope.properties[name];
+                }
+                scope = scope.parentScope;
+            }
+            // The root scope is also an object which has inherited properties and
+            // could also have getters.
+            if (scope === this.global && this.hasProperty(scope, name)) {
+                return this.getProperty(scope, name);
+            }
+            // Typeof operator is unique: it can safely look at non-defined variables.
+            var prevNode = this.stateStack[this.stateStack.length - 1].node;
+            if (prevNode['type'] === 'UnaryExpression' &&
+                prevNode['operator'] === 'typeof') {
+                return undefined;
+            }
+            this.throwException(this.REFERENCE_ERROR, name + ' is not defined');
+        };
+        ;
+        /**
+         * Sets a value to the current scope.
+         * @param {string} name Name of variable.
+         * @param {Interpreter.MyValue} value Value.
+         * @return {!Interpreter.MyObject|undefined} Returns a setter function if one
+         *     needs to be called, otherwise undefined.
+         */
+        Interpreter.prototype.setValueToScope = function (name, value) {
+            var scope = this.getScope();
+            var strict = scope.strict;
+            while (scope && scope !== this.global) {
+                if (name in scope.properties) {
+                    scope.properties[name] = value;
+                    return undefined;
+                }
+                scope = scope.parentScope;
+            }
+            // The root scope is also an object which has readonly properties and
+            // could also have setters.
+            if (scope === this.global && (!strict || this.hasProperty(scope, name))) {
+                return this.setProperty(scope, name, value);
+            }
+            this.throwException(this.REFERENCE_ERROR, name + ' is not defined');
+        };
+        ;
+        /**
+         * Create a new scope for the given node.
+         * @param {!Object} node AST node (program or function).
+         * @param {!Interpreter.MyObject} scope Scope dictionary to populate.
+         * @private
+         */
+        Interpreter.prototype.populateScope_ = function (node, scope) {
+            if (node['type'] === 'VariableDeclaration') {
+                for (var i = 0; i < node['declarations'].length; i++) {
+                    this.setProperty(scope, node['declarations'][i]['id']['name'], undefined, Interpreter.VARIABLE_DESCRIPTOR);
+                }
+            }
+            else if (node['type'] === 'FunctionDeclaration') {
+                this.setProperty(scope, node['id']['name'], this.createFunction(node, scope), Interpreter.VARIABLE_DESCRIPTOR);
+                return; // Do not recurse into function.
+            }
+            else if (node['type'] === 'FunctionExpression') {
+                return; // Do not recurse into function.
+            }
+            else if (node['type'] === 'ExpressionStatement') {
+                return; // Expressions can't contain variable/function declarations.
+            }
+            var nodeClass = node['constructor'];
+            for (var name in node) {
+                var prop = node[name];
+                if (prop && typeof prop === 'object') {
+                    if (Array.isArray(prop)) {
+                        for (var i = 0; i < prop.length; i++) {
+                            if (prop[i] && prop[i].constructor === nodeClass) {
+                                this.populateScope_(prop[i], scope);
+                            }
+                        }
+                    }
+                    else {
+                        if (prop.constructor === nodeClass) {
+                            this.populateScope_(prop, scope);
+                        }
+                    }
+                }
+            }
+        };
+        ;
+        /**
+         * Remove start and end values from AST, or set start and end values to a
+         * constant value.  Used to remove highlighting from polyfills and to set
+         * highlighting in an eval to cover the entire eval expression.
+         * @param {!Object} node AST node.
+         * @param {number=} start Starting character of all nodes, or undefined.
+         * @param {number=} end Ending character of all nodes, or undefined.
+         * @private
+         */
+        Interpreter.prototype.stripLocations_ = function (node, start, end) {
+            if (start) {
+                node['start'] = start;
+            }
+            else {
+                delete node['start'];
+            }
+            if (end) {
+                node['end'] = end;
+            }
+            else {
+                delete node['end'];
+            }
+            for (var name in node) {
+                if (node.hasOwnProperty(name)) {
+                    var prop = node[name];
+                    if (prop && typeof prop === 'object') {
+                        this.stripLocations_(prop, start, end);
+                    }
+                }
+            }
+        };
+        ;
+        /**
+         * Is the current state directly being called with as a construction with 'new'.
+         * @return {boolean} True if 'new foo()', false if 'foo()'.
+         */
+        Interpreter.prototype.calledWithNew = function () {
+            return this.stateStack[this.stateStack.length - 1].isConstructor;
+        };
+        ;
+        /**
+         * Gets a value from the scope chain or from an object property.
+         * @param {!Array} ref Name of variable or object/propname tuple.
+         * @return {Interpreter.MyValue} Any value.
+         *   May be flagged as being a getter and thus needing immediate execution
+         *   (rather than being the value of the property).
+         */
+        Interpreter.prototype.getValue = function (ref) {
+            if (ref[0] === Interpreter.SCOPE_REFERENCE) {
+                // A null/varname variable lookup.
+                return this.getValueFromScope(ref[1]);
+            }
+            else {
+                // An obj/prop components tuple (foo.bar).
+                return this.getProperty(ref[0], ref[1]);
+            }
+        };
+        ;
+        /**
+         * Sets a value to the scope chain or to an object property.
+         * @param {!Array} ref Name of variable or object/propname tuple.
+         * @param {Interpreter.MyValue} value Value.
+         * @return {!Interpreter.MyObject|undefined} Returns a setter function if one
+         *     needs to be called, otherwise undefined.
+         */
+        Interpreter.prototype.setValue = function (ref, value) {
+            if (ref[0] === Interpreter.SCOPE_REFERENCE) {
+                // A null/varname variable lookup.
+                return this.setValueToScope(ref[1], value);
+            }
+            else {
+                // An obj/prop components tuple (foo.bar).
+                return this.setProperty(ref[0], ref[1], value);
+            }
+        };
+        ;
+        /**
+         * Throw an exception in the interpreter that can be handled by an
+         * interpreter try/catch statement.  If unhandled, a real exception will
+         * be thrown.  Can be called with either an error class and a message, or
+         * with an actual object to be thrown.
+         * @param {!Interpreter.MyObject} errorClass Type of error (if message is
+         *   provided) or the value to throw (if no message).
+         * @param {string=} opt_message Message being thrown.
+         */
+        Interpreter.prototype.throwException = function (errorClass, opt_message) {
+            if (opt_message === undefined) {
+                var error = errorClass; // This is a value to throw, not an error class.
+            }
+            else {
+                var error = this.createObject(errorClass);
+                this.setProperty(error, 'message', opt_message, Interpreter.NONENUMERABLE_DESCRIPTOR);
+            }
+            this.executeException(error);
+            // Abort anything related to the current step.
+            throw Interpreter.STEP_ERROR;
+        };
+        ;
+        /**
+         * Throw an exception in the interpreter that can be handled by a
+         * interpreter try/catch statement.  If unhandled, a real exception will
+         * be thrown.
+         * @param {!Interpreter.MyObject} error Error object to execute.
+         */
+        Interpreter.prototype.executeException = function (error) {
+            // Search for a try statement.
+            var stateStack = this.stateStack.slice();
+            do {
+                this.stateStack.pop();
+                var state = this.stateStack[this.stateStack.length - 1];
+                if (state.node['type'] === 'TryStatement') {
+                    state.throwValue = error;
+                    return;
+                }
+            } while (state && state.node['type'] !== 'Program');
+            // Throw a real error.
+            var realError;
+            if (this.isa(error, this.ERROR)) {
+                var errorTable = {
+                    'EvalError': EvalError,
+                    'RangeError': RangeError,
+                    'ReferenceError': ReferenceError,
+                    'SyntaxError': SyntaxError,
+                    'TypeError': TypeError,
+                    'URIError': URIError
+                };
+                var name = this.getProperty(error, 'name').toString();
+                var message = this.getProperty(error, 'message').valueOf();
+                var type = errorTable[name] || Error;
+                realError = type(message);
+            }
+            else {
+                realError = String(error);
+            }
+            this.stateStack = stateStack; // recover the original state stack
+            throw realError;
+        };
+        ;
+        /**
+         * Create a call to a getter function.
+         * @param {!Interpreter.MyObject} func Function to execute.
+         * @param {!Interpreter.MyObject|!Array} left
+         *     Name of variable or object/propname tuple.
+         * @private
+         */
+        Interpreter.prototype.createGetter_ = function (func, left) {
+            // Normally 'this' will be specified as the object component (o.x).
+            // Sometimes 'this' is explicitly provided (o).
+            var funcThis = Array.isArray(left) ? left[0] : left;
+            var node = new this.nodeConstructor();
+            node['type'] = 'CallExpression';
+            var state = new Interpreter.MyState(node, this.stateStack[this.stateStack.length - 1].scope);
+            state.doneCallee_ = true;
+            state.funcThis_ = funcThis;
+            state.func_ = func;
+            state.doneArgs_ = true;
+            state.arguments_ = [];
+            return state;
+        };
+        ;
+        /**
+         * Create a call to a setter function.
+         * @param {!Interpreter.MyObject} func Function to execute.
+         * @param {!Interpreter.MyObject|!Array} left
+         *     Name of variable or object/propname tuple.
+         * @param {Interpreter.MyValue} value Value to set.
+         * @private
+         */
+        Interpreter.prototype.createSetter_ = function (func, left, value) {
+            // Normally 'this' will be specified as the object component (o.x).
+            // Sometimes 'this' is implicitly the global object (x).
+            var funcThis = Array.isArray(left) ? left[0] : this.global;
+            var node = new this.nodeConstructor();
+            node['type'] = 'CallExpression';
+            var state = new Interpreter.MyState(node, this.stateStack[this.stateStack.length - 1].scope);
+            state.doneCallee_ = true;
+            state.funcThis_ = funcThis;
+            state.func_ = func;
+            state.doneArgs_ = true;
+            state.arguments_ = [value];
+            return state;
+        };
+        ;
+        ///////////////////////////////////////////////////////////////////////////////
+        // Functions to handle each node type.
+        ///////////////////////////////////////////////////////////////////////////////
+        Interpreter.prototype.stepArrayExpression = function (stack, state, node) {
+            var elements = node['elements'];
+            var n = state.n_ || 0;
+            if (!state.array_) {
+                state.array_ = this.createObjectProto(this.ARRAY_PROTO);
+                state.array_.properties.length = elements.length;
+            }
+            else {
+                this.setProperty(state.array_, n, state.value);
+                n++;
+            }
+            while (n < elements.length) {
+                // Skip missing elements - they're not defined, not undefined.
+                if (elements[n]) {
+                    state.n_ = n;
+                    return new Interpreter.MyState(elements[n], state.scope);
+                }
+                n++;
+            }
+            stack.pop();
+            stack[stack.length - 1].value = state.array_;
+        };
+        ;
+        Interpreter.prototype.stepAssignmentExpression = function (stack, state, node) {
+            if (!state.doneLeft_) {
+                state.doneLeft_ = true;
+                var nextState = new Interpreter.MyState(node['left'], state.scope);
+                nextState.components = true;
+                return nextState;
+            }
+            if (!state.doneRight_) {
+                if (!state.leftReference_) {
+                    state.leftReference_ = state.value;
+                }
+                if (state.doneGetter_) {
+                    state.leftValue_ = state.value;
+                }
+                if (!state.doneGetter_ && node['operator'] !== '=') {
+                    var leftValue = this.getValue(state.leftReference_);
+                    state.leftValue_ = leftValue;
+                    if (leftValue && typeof leftValue === 'object' && leftValue.isGetter) {
+                        // Clear the getter flag and call the getter function.
+                        leftValue.isGetter = false;
+                        state.doneGetter_ = true;
+                        var func = (leftValue);
+                        return this.createGetter_(func, state.leftReference_);
+                    }
+                }
+                state.doneRight_ = true;
+                return new Interpreter.MyState(node['right'], state.scope);
+            }
+            if (state.doneSetter_) {
+                // Return if setter function.
+                // Setter method on property has completed.
+                // Ignore its return value, and use the original set value instead.
+                stack.pop();
+                stack[stack.length - 1].value = state.doneSetter_;
+                return;
+            }
+            var value = state.leftValue_;
+            var rightValue = state.value;
+            switch (node['operator']) {
+                case '=':
+                    value = rightValue;
+                    break;
+                case '+=':
+                    value += rightValue;
+                    break;
+                case '-=':
+                    value -= rightValue;
+                    break;
+                case '*=':
+                    value *= rightValue;
+                    break;
+                case '/=':
+                    value /= rightValue;
+                    break;
+                case '%=':
+                    value %= rightValue;
+                    break;
+                case '<<=':
+                    value <<= rightValue;
+                    break;
+                case '>>=':
+                    value >>= rightValue;
+                    break;
+                case '>>>=':
+                    value >>>= rightValue;
+                    break;
+                case '&=':
+                    value &= rightValue;
+                    break;
+                case '^=':
+                    value ^= rightValue;
+                    break;
+                case '|=':
+                    value |= rightValue;
+                    break;
+                default:
+                    throw SyntaxError('Unknown assignment expression: ' + node['operator']);
+            }
+            var setter = this.setValue(state.leftReference_, value);
+            if (setter) {
+                state.doneSetter_ = value;
+                return this.createSetter_(setter, state.leftReference_, value);
+            }
+            // Return if no setter function.
+            stack.pop();
+            stack[stack.length - 1].value = value;
+        };
+        ;
+        Interpreter.prototype.stepBinaryExpression = function (stack, state, node) {
+            if (!state.doneLeft_) {
+                state.doneLeft_ = true;
+                return new Interpreter.MyState(node['left'], state.scope);
+            }
+            if (!state.doneRight_) {
+                state.doneRight_ = true;
+                state.leftValue_ = state.value;
+                return new Interpreter.MyState(node['right'], state.scope);
+            }
+            stack.pop();
+            var leftValue = state.leftValue_;
+            var rightValue = state.value;
+            var value;
+            switch (node['operator']) {
+                case '==':
+                    value = leftValue == rightValue;
+                    break;
+                case '!=':
+                    value = leftValue != rightValue;
+                    break;
+                case '===':
+                    value = leftValue === rightValue;
+                    break;
+                case '!==':
+                    value = leftValue !== rightValue;
+                    break;
+                case '>':
+                    value = leftValue > rightValue;
+                    break;
+                case '>=':
+                    value = leftValue >= rightValue;
+                    break;
+                case '<':
+                    value = leftValue < rightValue;
+                    break;
+                case '<=':
+                    value = leftValue <= rightValue;
+                    break;
+                case '+':
+                    value = leftValue + rightValue;
+                    break;
+                case '-':
+                    value = leftValue - rightValue;
+                    break;
+                case '*':
+                    value = leftValue * rightValue;
+                    break;
+                case '/':
+                    value = leftValue / rightValue;
+                    break;
+                case '%':
+                    value = leftValue % rightValue;
+                    break;
+                case '&':
+                    value = leftValue & rightValue;
+                    break;
+                case '|':
+                    value = leftValue | rightValue;
+                    break;
+                case '^':
+                    value = leftValue ^ rightValue;
+                    break;
+                case '<<':
+                    value = leftValue << rightValue;
+                    break;
+                case '>>':
+                    value = leftValue >> rightValue;
+                    break;
+                case '>>>':
+                    value = leftValue >>> rightValue;
+                    break;
+                case 'in':
+                    if (!rightValue || !rightValue.isObject) {
+                        this.throwException(this.TYPE_ERROR, "'in' expects an object, not '" + rightValue + "'");
+                    }
+                    value = this.hasProperty(rightValue, leftValue);
+                    break;
+                case 'instanceof':
+                    if (!this.isa(rightValue, this.FUNCTION)) {
+                        this.throwException(this.TYPE_ERROR, 'Right-hand side of instanceof is not an object');
+                    }
+                    value = leftValue.isObject ? this.isa(leftValue, rightValue) : false;
+                    break;
+                default:
+                    throw SyntaxError('Unknown binary operator: ' + node['operator']);
+            }
+            stack[stack.length - 1].value = value;
+        };
+        ;
+        Interpreter.prototype.stepBlockStatement = function (stack, state, node) {
+            var n = state.n_ || 0;
+            var expression = node['body'][n];
+            if (expression) {
+                state.n_ = n + 1;
+                return new Interpreter.MyState(expression, state.scope);
+            }
+            stack.pop();
+        };
+        ;
+        Interpreter.prototype.stepBreakStatement = function (stack, state, node) {
+            stack.pop();
+            var label = null;
+            if (node['label']) {
+                label = node['label']['name'];
+            }
+            while (state &&
+                state.node['type'] !== 'CallExpression' &&
+                state.node['type'] !== 'NewExpression') {
+                if (label) {
+                    if (state.labels && state.labels.indexOf(label) !== -1) {
+                        return;
+                    }
+                }
+                else if (state.isLoop || state.isSwitch) {
+                    return;
+                }
+                state = stack.pop();
+            }
+            // Syntax error, do not allow this error to be trapped.
+            throw SyntaxError('Illegal break statement');
+        };
+        ;
+        Interpreter.prototype.stepCallExpression = function (stack, state, node) {
+            if (!state.doneCallee_) {
+                state.doneCallee_ = 1;
+                // Components needed to determine value of 'this'.
+                var nextState = new Interpreter.MyState(node['callee'], state.scope);
+                nextState.components = true;
+                return nextState;
+            }
+            if (state.doneCallee_ === 1) {
+                // Determine value of the function.
+                state.doneCallee_ = 2;
+                var func = state.value;
+                if (Array.isArray(func)) {
+                    state.func_ = this.getValue(func);
+                    if (func[0] !== Interpreter.SCOPE_REFERENCE) {
+                        // Method function, 'this' is object (ignored if invoked as 'new').
+                        state.funcThis_ = func[0];
+                    }
+                    func = state.func_;
+                    if (func && typeof func === 'object' && func.isGetter) {
+                        // Clear the getter flag and call the getter function.
+                        func.isGetter = false;
+                        state.doneCallee_ = 1;
+                        return this.createGetter_(/** @type {!Interpreter.Object} */ (func), state.value);
+                    }
+                }
+                else {
+                    // Already evaluated function: (function(){...})();
+                    state.func_ = func;
+                }
+                state.arguments_ = [];
+                state.n_ = 0;
+            }
+            var func = state.func_;
+            if (!state.doneArgs_) {
+                if (state.n_ !== 0) {
+                    state.arguments_.push(state.value);
+                }
+                if (node['arguments'][state.n_]) {
+                    return new Interpreter.MyState(node['arguments'][state.n_++], state.scope);
+                }
+                // Determine value of 'this' in function.
+                if (node['type'] === 'NewExpression') {
+                    if (func.illegalConstructor) {
+                        // Illegal: new escape();
+                        this.throwException(this.TYPE_ERROR, func + ' is not a constructor');
+                    }
+                    // Constructor, 'this' is new object.
+                    state.funcThis_ = this.createObject(func);
+                    state.isConstructor = true;
+                }
+                else if (state.funcThis_ === undefined) {
+                    // Global function, 'this' is global object (or 'undefined' if strict).
+                    state.funcThis_ = state.scope.strict ? undefined : this.global;
+                }
+                state.doneArgs_ = true;
+            }
+            if (!state.doneExec_) {
+                state.doneExec_ = true;
+                if (!func || !func.isObject) {
+                    this.throwException(this.TYPE_ERROR, func + ' is not a function');
+                }
+                var funcNode = func.node;
+                if (funcNode) {
+                    var scope = this.createScope(funcNode['body'], func.parentScope);
+                    // Add all arguments.
+                    for (var i = 0; i < funcNode['params'].length; i++) {
+                        var paramName = funcNode['params'][i]['name'];
+                        var paramValue = state.arguments_.length > i ? state.arguments_[i] :
+                            undefined;
+                        this.setProperty(scope, paramName, paramValue);
+                    }
+                    // Build arguments variable.
+                    var argsList = this.createObjectProto(this.ARRAY_PROTO);
+                    for (var i = 0; i < state.arguments_.length; i++) {
+                        this.setProperty(argsList, i, state.arguments_[i]);
+                    }
+                    this.setProperty(scope, 'arguments', argsList);
+                    // Add the function's name (var x = function foo(){};)
+                    var name = funcNode['id'] && funcNode['id']['name'];
+                    if (name) {
+                        this.setProperty(scope, name, func);
+                    }
+                    this.setProperty(scope, 'this', state.funcThis_, Interpreter.READONLY_DESCRIPTOR);
+                    state.value = undefined; // Default value if no explicit return.
+                    return new Interpreter.MyState(funcNode['body'], scope);
+                }
+                else if (func.eval) {
+                    var code = state.arguments_[0];
+                    if (typeof code !== 'string') {
+                        // JS does not parse String objects:
+                        // eval(new String('1 + 1')) -> '1 + 1'
+                        state.value = code;
+                    }
+                    else {
+                        try {
+                            var ast = Interpreter.acorn.parse(code.toString(), Interpreter.PARSE_OPTIONS);
+                        }
+                        catch (e) {
+                            // Acorn threw a SyntaxError.  Rethrow as a trappable error.
+                            this.throwException(this.SYNTAX_ERROR, 'Invalid code: ' + e.message);
+                        }
+                        var evalNode = new this.nodeConstructor();
+                        evalNode['type'] = 'EvalProgram_';
+                        evalNode['body'] = ast['body'];
+                        this.stripLocations_(evalNode, node['start'], node['end']);
+                        // Update current scope with definitions in eval().
+                        var scope = state.scope;
+                        if (scope.strict) {
+                            // Strict mode get its own scope in eval.
+                            scope = this.createScope(ast, scope);
+                        }
+                        else {
+                            // Non-strict mode pollutes the current scope.
+                            this.populateScope_(ast, scope);
+                        }
+                        this.value = undefined; // Default value if no code.
+                        return new Interpreter.MyState(evalNode, scope);
+                    }
+                }
+                else if (func.nativeFunc) {
+                    state.value = func.nativeFunc.apply(state.funcThis_, state.arguments_);
+                }
+                else if (func.asyncFunc) {
+                    var thisInterpreter = this;
+                    var callback = function (value) {
+                        state.value = value;
+                        thisInterpreter.paused_ = false;
+                    };
+                    var argsWithCallback = state.arguments_.concat(callback);
+                    this.paused_ = true;
+                    func.asyncFunc.apply(state.funcThis_, argsWithCallback);
+                    return;
+                }
+                else {
+                    /* A child of a function is a function but is not callable.  For example:
+                    var F = function() {};
+                    F.prototype = escape;
+                    var f = new F();
+                    f();
+                    */
+                    this.throwException(this.TYPE_ERROR, func.class + ' is not a function');
+                }
+            }
+            else {
+                // Execution complete.  Put the return value on the stack.
+                stack.pop();
+                if (state.isConstructor && typeof state.value !== 'object') {
+                    stack[stack.length - 1].value = state.funcThis_;
+                }
+                else {
+                    stack[stack.length - 1].value = state.value;
+                }
+            }
+        };
+        ;
+        Interpreter.prototype.stepCatchClause = function (stack, state, node) {
+            if (!state.done_) {
+                state.done_ = true;
+                // Create an empty scope.
+                var scope = this.createSpecialScope(state.scope);
+                // Add the argument.
+                this.setProperty(scope, node['param']['name'], state.throwValue);
+                // Execute catch clause.
+                return new Interpreter.MyState(node['body'], scope);
+            }
+            else {
+                stack.pop();
+            }
+        };
+        ;
+        Interpreter.prototype.stepConditionalExpression = function (stack, state, node) {
+            var mode = state.mode_ || 0;
+            if (mode === 0) {
+                state.mode_ = 1;
+                return new Interpreter.MyState(node['test'], state.scope);
+            }
+            if (mode === 1) {
+                state.mode_ = 2;
+                var value = Boolean(state.value);
+                if (value && node['consequent']) {
+                    // Execute 'if' block.
+                    return new Interpreter.MyState(node['consequent'], state.scope);
+                }
+                else if (!value && node['alternate']) {
+                    // Execute 'else' block.
+                    return new Interpreter.MyState(node['alternate'], state.scope);
+                }
+                // eval('1;if(false){2}') -> undefined
+                this.value = undefined;
+            }
+            stack.pop();
+            if (node['type'] === 'ConditionalExpression') {
+                stack[stack.length - 1].value = state.value;
+            }
+        };
+        ;
+        Interpreter.prototype.stepContinueStatement = function (stack, state, node) {
+            stack.pop();
+            var label = null;
+            if (node['label']) {
+                label = node['label']['name'];
+            }
+            state = stack[stack.length - 1];
+            while (state &&
+                state.node['type'] !== 'CallExpression' &&
+                state.node['type'] !== 'NewExpression') {
+                if (state.isLoop) {
+                    if (!label || (state.labels && state.labels.indexOf(label) !== -1)) {
+                        return;
+                    }
+                }
+                stack.pop();
+                state = stack[stack.length - 1];
+            }
+            // Syntax error, do not allow this error to be trapped.
+            throw SyntaxError('Illegal continue statement');
+        };
+        ;
+        Interpreter.prototype.stepDebuggerStatement = function (stack, state, node) {
+            // Do nothing.  May be overridden by developers.
+            stack.pop();
+        };
+        ;
+        Interpreter.prototype.stepDoWhileStatement = function (stack, state, node) {
+            if (node['type'] === 'DoWhileStatement' && state.test_ === undefined) {
+                // First iteration of do/while executes without checking test.
+                state.value = true;
+                state.test_ = true;
+            }
+            if (!state.test_) {
+                state.test_ = true;
+                return new Interpreter.MyState(node['test'], state.scope);
+            }
+            if (!state.value) {
+                stack.pop();
+            }
+            else if (node['body']) {
+                state.test_ = false;
+                state.isLoop = true;
+                return new Interpreter.MyState(node['body'], state.scope);
+            }
+        };
+        ;
+        Interpreter.prototype.stepEmptyStatement = function (stack, state, node) {
+            stack.pop();
+        };
+        ;
+        Interpreter.prototype.stepEvalProgram_ = function (stack, state, node) {
+            var n = state.n_ || 0;
+            var expression = node['body'][n];
+            if (expression) {
+                state.n_ = n + 1;
+                return new Interpreter.MyState(expression, state.scope);
+            }
+            stack.pop();
+            stack[stack.length - 1].value = this.value;
+        };
+        ;
+        Interpreter.prototype.stepExpressionStatement = function (stack, state, node) {
+            if (!state.done_) {
+                state.done_ = true;
+                return new Interpreter.MyState(node['expression'], state.scope);
+            }
+            stack.pop();
+            // Save this value to interpreter.value for use as a return value if
+            // this code is inside an eval function.
+            this.value = state.value;
+        };
+        ;
+        Interpreter.prototype.stepForInStatement = function (stack, state, node) {
+            // First, initialize a variable if exists.  Only do so once, ever.
+            if (!state.doneInit_) {
+                state.doneInit_ = true;
+                if (node['left']['declarations'] &&
+                    node['left']['declarations'][0]['init']) {
+                    if (state.scope.strict) {
+                        this.throwException(this.SYNTAX_ERROR, 'for-in loop variable declaration may not have an initializer.');
+                    }
+                    // Variable initialization: for (var x = 4 in y)
+                    return new Interpreter.MyState(node['left'], state.scope);
+                }
+            }
+            // Second, look up the object.  Only do so once, ever.
+            if (!state.doneObject_) {
+                state.doneObject_ = true;
+                if (!state.variable_) {
+                    state.variable_ = state.value;
+                }
+                return new Interpreter.MyState(node['right'], state.scope);
+            }
+            if (!state.isLoop) {
+                // First iteration.
+                state.isLoop = true;
+                state.object_ = state.value;
+                state.visited_ = Object.create(null);
+            }
+            // Third, find the property name for this iteration.
+            if (state.name_ === undefined) {
+                done: do {
+                    if (state.object_ && state.object_.isObject) {
+                        if (!state.props_) {
+                            state.props_ = Object.getOwnPropertyNames(state.object_.properties);
+                        }
+                        do {
+                            var prop = state.props_.shift();
+                        } while (prop && (state.visited_[prop] ||
+                            !Object.prototype.hasOwnProperty.call(state.object_.properties, prop)));
+                        if (prop) {
+                            state.visited_[prop] = true;
+                            if (Object.prototype.propertyIsEnumerable.call(state.object_.properties, prop)) {
+                                state.name_ = prop;
+                                break done;
+                            }
+                        }
+                    }
+                    else if (state.object_ !== null) {
+                        if (!state.props_) {
+                            state.props_ = Object.getOwnPropertyNames(state.object_);
+                        }
+                        do {
+                            var prop = state.props_.shift();
+                        } while (prop && state.visited_[prop]);
+                        if (prop) {
+                            state.visited_[prop] = true;
+                            state.name_ = prop;
+                            break done;
+                        }
+                    }
+                    state.object_ = this.getPrototype(state.object_);
+                    state.props_ = null;
+                } while (state.object_ !== null);
+                if (state.object_ === null) {
+                    // Done, exit loop.
+                    stack.pop();
+                    return;
+                }
+            }
+            // Fourth, find the variable
+            if (!state.doneVariable_) {
+                state.doneVariable_ = true;
+                var left = node['left'];
+                if (left['type'] === 'VariableDeclaration') {
+                    // Inline variable declaration: for (var x in y)
+                    state.variable_ =
+                        [Interpreter.SCOPE_REFERENCE, left['declarations'][0]['id']['name']];
+                }
+                else {
+                    // Arbitrary left side: for (foo().bar in y)
+                    state.variable_ = null;
+                    var nextState = new Interpreter.MyState(left, state.scope);
+                    nextState.components = true;
+                    return nextState;
+                }
+            }
+            if (!state.variable_) {
+                state.variable_ = state.value;
+            }
+            // Fifth, set the variable.
+            if (!state.doneSetter_) {
+                state.doneSetter_ = true;
+                var value = state.name_;
+                var setter = this.setValue(state.variable_, value);
+                if (setter) {
+                    return this.createSetter_(setter, state.variable_, value);
+                }
+            }
+            // Next step will be step three.
+            state.name_ = undefined;
+            // Reevaluate the variable since it could be a setter on the global object.
+            state.doneVariable_ = false;
+            state.doneSetter_ = false;
+            // Sixth and finally, execute the body if there was one.  this.
+            if (node['body']) {
+                return new Interpreter.MyState(node['body'], state.scope);
+            }
+        };
+        ;
+        Interpreter.prototype.stepForStatement = function (stack, state, node) {
+            var mode = state.mode_ || 0;
+            if (mode === 0) {
+                state.mode_ = 1;
+                if (node['init']) {
+                    return new Interpreter.MyState(node['init'], state.scope);
+                }
+            }
+            else if (mode === 1) {
+                state.mode_ = 2;
+                if (node['test']) {
+                    return new Interpreter.MyState(node['test'], state.scope);
+                }
+            }
+            else if (mode === 2) {
+                state.mode_ = 3;
+                if (node['test'] && !state.value) {
+                    // Done, exit loop.
+                    stack.pop();
+                }
+                else {
+                    state.isLoop = true;
+                    return new Interpreter.MyState(node['body'], state.scope);
+                }
+            }
+            else if (mode === 3) {
+                state.mode_ = 1;
+                if (node['update']) {
+                    return new Interpreter.MyState(node['update'], state.scope);
+                }
+            }
+        };
+        ;
+        Interpreter.prototype.stepFunctionDeclaration = function (stack, state, node) {
+            // This was found and handled when the scope was populated.
+            stack.pop();
+        };
+        ;
+        Interpreter.prototype.stepFunctionExpression = function (stack, state, node) {
+            stack.pop();
+            stack[stack.length - 1].value = this.createFunction(node, state.scope);
+        };
+        ;
+        Interpreter.prototype.stepIdentifier = function (stack, state, node) {
+            stack.pop();
+            if (state.components) {
+                stack[stack.length - 1].value = [Interpreter.SCOPE_REFERENCE, node['name']];
+                return;
+            }
+            var value = this.getValueFromScope(node['name']);
+            // An identifier could be a getter if it's a property on the global object.
+            if (value && typeof value === 'object' && value.isGetter) {
+                // Clear the getter flag and call the getter function.
+                value.isGetter = false;
+                var scope = state.scope;
+                while (!this.hasProperty(scope, node['name'])) {
+                    scope = scope.parentScope;
+                }
+                var func = (value);
+                return this.createGetter_(func, this.global);
+            }
+            stack[stack.length - 1].value = value;
+        };
+        ;
+        Interpreter.prototype.stepIfStatement = function (stack, state, node) {
+            return this.stepConditionalExpression(stack, state, node);
+        };
+        Interpreter.prototype.stepLabeledStatement = function (stack, state, node) {
+            // No need to hit this node again on the way back up the stack.
+            stack.pop();
+            // Note that a statement might have multiple labels.
+            var labels = state.labels || [];
+            labels.push(node['label']['name']);
+            var nextState = new Interpreter.MyState(node['body'], state.scope);
+            nextState.labels = labels;
+            return nextState;
+        };
+        ;
+        Interpreter.prototype.stepLiteral = function (stack, state, node) {
+            stack.pop();
+            var value = node['value'];
+            if (value instanceof RegExp) {
+                var pseudoRegexp = this.createObjectProto(this.REGEXP_PROTO);
+                this.populateRegExp(pseudoRegexp, value);
+                value = pseudoRegexp;
+            }
+            stack[stack.length - 1].value = value;
+        };
+        ;
+        Interpreter.prototype.stepLogicalExpression = function (stack, state, node) {
+            if (node['operator'] !== '&&' && node['operator'] !== '||') {
+                throw SyntaxError('Unknown logical operator: ' + node['operator']);
+            }
+            if (!state.doneLeft_) {
+                state.doneLeft_ = true;
+                return new Interpreter.MyState(node['left'], state.scope);
+            }
+            if (!state.doneRight_) {
+                if ((node['operator'] === '&&' && !state.value) ||
+                    (node['operator'] === '||' && state.value)) {
+                    // Shortcut evaluation.
+                    stack.pop();
+                    stack[stack.length - 1].value = state.value;
+                }
+                else {
+                    state.doneRight_ = true;
+                    return new Interpreter.MyState(node['right'], state.scope);
+                }
+            }
+            else {
+                stack.pop();
+                stack[stack.length - 1].value = state.value;
+            }
+        };
+        ;
+        Interpreter.prototype.stepMemberExpression = function (stack, state, node) {
+            if (!state.doneObject_) {
+                state.doneObject_ = true;
+                return new Interpreter.MyState(node['object'], state.scope);
+            }
+            var propName;
+            if (!node['computed']) {
+                state.object_ = state.value;
+                // obj.foo -- Just access 'foo' directly.
+                propName = node['property']['name'];
+            }
+            else if (!state.doneProperty_) {
+                state.object_ = state.value;
+                // obj[foo] -- Compute value of 'foo'.
+                state.doneProperty_ = true;
+                return new Interpreter.MyState(node['property'], state.scope);
+            }
+            else {
+                propName = state.value;
+            }
+            stack.pop();
+            if (state.components) {
+                stack[stack.length - 1].value = [state.object_, propName];
+            }
+            else {
+                var value = this.getProperty(state.object_, propName);
+                if (value && typeof value === 'object' && value.isGetter) {
+                    // Clear the getter flag and call the getter function.
+                    value.isGetter = false;
+                    var func = (value);
+                    return this.createGetter_(func, state.object_);
+                }
+                stack[stack.length - 1].value = value;
+            }
+        };
+        ;
+        Interpreter.prototype.stepNewExpression = function (stack, state, node) {
+            return this.stepCallExpression(stack, state, node);
+        };
+        Interpreter.prototype.stepObjectExpression = function (stack, state, node) {
+            var n = state.n_ || 0;
+            var property = node['properties'][n];
+            if (!state.object_) {
+                // First execution.
+                state.object_ = this.createObjectProto(this.OBJECT_PROTO);
+                state.properties_ = Object.create(null);
+            }
+            else {
+                // Determine property name.
+                var key = property['key'];
+                if (key['type'] === 'Identifier') {
+                    var propName = key['name'];
+                }
+                else if (key['type'] === 'Literal') {
+                    var propName = key['value'];
+                }
+                else {
+                    throw SyntaxError('Unknown object structure: ' + key['type']);
+                }
+                // Set the property computed in the previous execution.
+                if (!state.properties_[propName]) {
+                    // Create temp object to collect value, getter, and/or setter.
+                    state.properties_[propName] = {};
+                }
+                state.properties_[propName][property['kind']] = state.value;
+                state.n_ = ++n;
+                property = node['properties'][n];
+            }
+            if (property) {
+                return new Interpreter.MyState(property['value'], state.scope);
+            }
+            for (var key in state.properties_) {
+                var kinds = state.properties_[key];
+                if ('get' in kinds || 'set' in kinds) {
+                    // Set a property with a getter or setter.
+                    var descriptor = {
+                        configurable: true,
+                        enumerable: true,
+                        get: kinds['get'],
+                        set: kinds['set']
+                    };
+                    this.setProperty(state.object_, key, null, descriptor);
+                }
+                else {
+                    // Set a normal property with a value.
+                    this.setProperty(state.object_, key, kinds['init']);
+                }
+            }
+            stack.pop();
+            stack[stack.length - 1].value = state.object_;
+        };
+        ;
+        Interpreter.prototype.stepProgram = function (stack, state, node) {
+            var n = state.n_ || 0;
+            var expression = node['body'][n];
+            if (expression) {
+                state.done = false;
+                state.n_ = n + 1;
+                return new Interpreter.MyState(expression, state.scope);
+            }
+            state.done = true;
+            // Don't pop the stateStack.
+            // Leave the root scope on the tree in case the program is appended to.
+        };
+        ;
+        Interpreter.prototype.stepReturnStatement = function (stack, state, node) {
+            if (node['argument'] && !state.done_) {
+                state.done_ = true;
+                return new Interpreter.MyState(node['argument'], state.scope);
+            }
+            var value = state.value;
+            var i = stack.length - 1;
+            state = stack[i];
+            while (state.node['type'] !== 'CallExpression' &&
+                state.node['type'] !== 'NewExpression') {
+                if (state.node['type'] !== 'TryStatement') {
+                    stack.splice(i, 1);
+                }
+                i--;
+                if (i < 0) {
+                    // Syntax error, do not allow this error to be trapped.
+                    throw SyntaxError('Illegal return statement');
+                }
+                state = stack[i];
+            }
+            state.value = value;
+        };
+        ;
+        Interpreter.prototype.stepSequenceExpression = function (stack, state, node) {
+            var n = state.n_ || 0;
+            var expression = node['expressions'][n];
+            if (expression) {
+                state.n_ = n + 1;
+                return new Interpreter.MyState(expression, state.scope);
+            }
+            stack.pop();
+            stack[stack.length - 1].value = state.value;
+        };
+        ;
+        Interpreter.prototype.stepSwitchStatement = function (stack, state, node) {
+            if (!state.test_) {
+                state.test_ = 1;
+                return new Interpreter.MyState(node['discriminant'], state.scope);
+            }
+            if (state.test_ === 1) {
+                state.test_ = 2;
+                // Preserve switch value between case tests.
+                state.switchValue_ = state.value;
+            }
+            while (true) {
+                var index = state.index_ || 0;
+                var switchCase = node['cases'][index];
+                if (!state.matched_ && switchCase && !switchCase['test']) {
+                    // Test on the default case is null.
+                    // Bypass (but store) the default case, and get back to it later.
+                    state.defaultCase_ = index;
+                    state.index_ = index + 1;
+                    continue;
+                }
+                if (!switchCase && !state.matched_ && state.defaultCase_) {
+                    // Ran through all cases, no match.  Jump to the default.
+                    state.matched_ = true;
+                    state.index_ = state.defaultCase_;
+                    continue;
+                }
+                if (switchCase) {
+                    if (!state.matched_ && !state.tested_ && switchCase['test']) {
+                        state.tested_ = true;
+                        return new Interpreter.MyState(switchCase['test'], state.scope);
+                    }
+                    if (state.matched_ || state.value === state.switchValue_) {
+                        state.matched_ = true;
+                        var n = state.n_ || 0;
+                        if (switchCase['consequent'][n]) {
+                            state.isSwitch = true;
+                            state.n_ = n + 1;
+                            return new Interpreter.MyState(switchCase['consequent'][n], state.scope);
+                        }
+                    }
+                    // Move on to next case.
+                    state.tested_ = false;
+                    state.n_ = 0;
+                    state.index_ = index + 1;
+                }
+                else {
+                    stack.pop();
+                    return;
+                }
+            }
+        };
+        ;
+        Interpreter.prototype.stepThisExpression = function (stack, state, node) {
+            stack.pop();
+            stack[stack.length - 1].value = this.getValueFromScope('this');
+        };
+        ;
+        Interpreter.prototype.stepThrowStatement = function (stack, state, node) {
+            if (!state.done_) {
+                state.done_ = true;
+                return new Interpreter.MyState(node['argument'], state.scope);
+            }
+            else {
+                this.throwException(state.value);
+            }
+        };
+        ;
+        Interpreter.prototype.stepTryStatement = function (stack, state, node) {
+            if (!state.doneBlock_) {
+                state.doneBlock_ = true;
+                return new Interpreter.MyState(node['block'], state.scope);
+            }
+            if (state.throwValue && !state.doneHandler_ && node['handler']) {
+                state.doneHandler_ = true;
+                var nextState = new Interpreter.MyState(node['handler'], state.scope);
+                nextState.throwValue = state.throwValue;
+                state.throwValue = null; // This error has been handled, don't rethrow.
+                return nextState;
+            }
+            if (!state.doneFinalizer_ && node['finalizer']) {
+                state.doneFinalizer_ = true;
+                return new Interpreter.MyState(node['finalizer'], state.scope);
+            }
+            if (state.throwValue) {
+                // There was no catch handler, or the catch/finally threw an error.
+                // Throw the error up to a higher try.
+                this.executeException(state.throwValue);
+            }
+            else {
+                stack.pop();
+            }
+        };
+        ;
+        Interpreter.prototype.stepUnaryExpression = function (stack, state, node) {
+            if (!state.done_) {
+                state.done_ = true;
+                var nextState = new Interpreter.MyState(node['argument'], state.scope);
+                nextState.components = node['operator'] === 'delete';
+                return nextState;
+            }
+            stack.pop();
+            var value = state.value;
+            if (node['operator'] === '-') {
+                value = -value;
+            }
+            else if (node['operator'] === '+') {
+                value = +value;
+            }
+            else if (node['operator'] === '!') {
+                value = !value;
+            }
+            else if (node['operator'] === '~') {
+                value = ~value;
+            }
+            else if (node['operator'] === 'delete') {
+                var result = true;
+                // If value is not an array, then it is a primitive, or some other value.
+                // If so, skip the delete and return true.
+                if (Array.isArray(value)) {
+                    var obj = value[0];
+                    if (obj === Interpreter.SCOPE_REFERENCE) {
+                        // 'delete foo;' is the same as 'delete window.foo'.
+                        obj = state.scope;
+                    }
+                    var name = String(value[1]);
+                    try {
+                        delete obj.properties[name];
+                    }
+                    catch (e) {
+                        if (state.scope.strict) {
+                            this.throwException(this.TYPE_ERROR, "Cannot delete property '" +
+                                name + "' of '" + obj + "'");
+                        }
+                        else {
+                            result = false;
+                        }
+                    }
+                }
+                value = result;
+            }
+            else if (node['operator'] === 'typeof') {
+                value = (value && value.class === 'Function') ? 'function' : typeof value;
+            }
+            else if (node['operator'] === 'void') {
+                value = undefined;
+            }
+            else {
+                throw SyntaxError('Unknown unary operator: ' + node['operator']);
+            }
+            stack[stack.length - 1].value = value;
+        };
+        ;
+        Interpreter.prototype.stepUpdateExpression = function (stack, state, node) {
+            if (!state.doneLeft_) {
+                state.doneLeft_ = true;
+                var nextState = new Interpreter.MyState(node['argument'], state.scope);
+                nextState.components = true;
+                return nextState;
+            }
+            if (!state.leftSide_) {
+                state.leftSide_ = state.value;
+            }
+            if (state.doneGetter_) {
+                state.leftValue_ = state.value;
+            }
+            if (!state.doneGetter_) {
+                var leftValue = this.getValue(state.leftSide_);
+                state.leftValue_ = leftValue;
+                if (leftValue && typeof leftValue === 'object' && leftValue.isGetter) {
+                    // Clear the getter flag and call the getter function.
+                    leftValue.isGetter = false;
+                    state.doneGetter_ = true;
+                    var func = (leftValue);
+                    return this.createGetter_(func, state.leftSide_);
+                }
+            }
+            if (state.doneSetter_) {
+                // Return if setter function.
+                // Setter method on property has completed.
+                // Ignore its return value, and use the original set value instead.
+                stack.pop();
+                stack[stack.length - 1].value = state.doneSetter_;
+                return;
+            }
+            leftValue = Number(state.leftValue_);
+            var changeValue;
+            if (node['operator'] === '++') {
+                changeValue = leftValue + 1;
+            }
+            else if (node['operator'] === '--') {
+                changeValue = leftValue - 1;
+            }
+            else {
+                throw SyntaxError('Unknown update expression: ' + node['operator']);
+            }
+            var returnValue = node['prefix'] ? changeValue : leftValue;
+            var setter = this.setValue(state.leftSide_, changeValue);
+            if (setter) {
+                state.doneSetter_ = returnValue;
+                return this.createSetter_(setter, state.leftSide_, changeValue);
+            }
+            // Return if no setter function.
+            stack.pop();
+            stack[stack.length - 1].value = returnValue;
+        };
+        ;
+        Interpreter.prototype.stepVariableDeclaration = function (stack, state, node) {
+            var declarations = node['declarations'];
+            var n = state.n_ || 0;
+            var declarationNode = declarations[n];
+            if (state.init_ && declarationNode) {
+                // This setValue call never needs to deal with calling a setter function.
+                // Note that this is setting the init value, not defining the variable.
+                // Variable definition is done when scope is populated.
+                this.setValueToScope(declarationNode['id']['name'], state.value);
+                state.init_ = false;
+                declarationNode = declarations[++n];
+            }
+            while (declarationNode) {
+                // Skip any declarations that are not initialized.  They have already
+                // been defined as undefined in populateScope_.
+                if (declarationNode['init']) {
+                    state.n_ = n;
+                    state.init_ = true;
+                    return new Interpreter.MyState(declarationNode['init'], state.scope);
+                }
+                declarationNode = declarations[++n];
+            }
+            stack.pop();
+        };
+        ;
+        Interpreter.prototype.stepWithStatement = function (stack, state, node) {
+            if (!state.doneObject_) {
+                state.doneObject_ = true;
+                return new Interpreter.MyState(node['object'], state.scope);
+            }
+            else if (!state.doneBody_) {
+                state.doneBody_ = true;
+                var scope = this.createSpecialScope(state.scope, state.value);
+                return new Interpreter.MyState(node['body'], scope);
+            }
+            else {
+                stack.pop();
+            }
+        };
+        ;
+        Interpreter.prototype.stepWhileStatement = function (stack, state, node) {
+            return this.stepDoWhileStatement(stack, state, node);
+        };
+        /**
+         * @const {!Object} Configuration used for all Acorn parsing.
+         */
+        Interpreter.PARSE_OPTIONS = {
+            ecmaVersion: 5
+        };
+        /**
+         * Property descriptor of readonly properties.
+         */
+        Interpreter.READONLY_DESCRIPTOR = {
+            configurable: true,
+            enumerable: true,
+            writable: false
+        };
+        /**
+         * Property descriptor of non-enumerable properties.
+         */
+        Interpreter.NONENUMERABLE_DESCRIPTOR = {
+            configurable: true,
+            enumerable: false,
+            writable: true
+        };
+        /**
+         * Property descriptor of readonly, non-enumerable properties.
+         */
+        Interpreter.READONLY_NONENUMERABLE_DESCRIPTOR = {
+            configurable: true,
+            enumerable: false,
+            writable: false
+        };
+        /**
+         * Property descriptor of variables.
+         */
+        Interpreter.VARIABLE_DESCRIPTOR = {
+            configurable: false,
+            enumerable: true,
+            writable: true
+        };
+        /**
+         * Unique symbol for indicating that a step has encountered an error, has
+         * added it to the stack, and will be thrown within the user's program.
+         * When STEP_ERROR is thrown in the JS-Interpreter, the error can be ignored.
+         */
+        Interpreter.STEP_ERROR = {};
+        /**
+         * Unique symbol for indicating that a reference is a variable on the scope,
+         * not an object property.
+         */
+        Interpreter.SCOPE_REFERENCE = {};
+        /**
+         * For cycle detection in array to string and error conversion;
+         * see spec bug github.com/tc39/ecma262/issues/289
+         * Since this is for atomic actions only, it can be a class property.
+         */
+        Interpreter.toStringCycles_ = [];
+        return Interpreter;
+    }());
+    (function (Interpreter) {
+        /**
+         * Class for an object.
+         * @param {Interpreter.MyObject} proto Prototype object or null.
+         * @constructor
+         */
+        var MyObject = (function () {
+            function MyObject(proto) {
+                /** @type {Interpreter.MyObject} */
+                this.proto = null;
+                /** @type {boolean} */
+                this.isObject = true;
+                /** @type {string} */
+                this.class = 'Object';
+                /** @type {Date|RegExp|boolean|number|string|undefined|null} */
+                this.data = null;
+                this.getter = Object.create(null);
+                this.setter = Object.create(null);
+                this.properties = Object.create(null);
+                this.proto = proto;
+            }
+            /**
+             * Convert this object into a string.
+             * @return {string} String value.
+             * @override
+             */
+            MyObject.prototype.toString = function () {
+                if (this.class === 'Array') {
+                    // Array
+                    var cycles = Interpreter.toStringCycles_;
+                    cycles.push(this);
+                    try {
+                        var strs = [];
+                        for (var i = 0; i < this.properties.length; i++) {
+                            var value = this.properties[i];
+                            strs[i] = (value && value.isObject && cycles.indexOf(value) !== -1) ?
+                                '...' : value;
+                        }
+                    }
+                    finally {
+                        cycles.pop();
+                    }
+                    return strs.join(',');
+                }
+                if (this.class === 'Error') {
+                    var cycles = Interpreter.toStringCycles_;
+                    if (cycles.indexOf(this) !== -1) {
+                        return '[object Error]';
+                    }
+                    var name, message;
+                    // Bug: Does not support getters and setters for name or message.
+                    var obj = this;
+                    do {
+                        if ('name' in obj.properties) {
+                            name = obj.properties['name'];
+                            break;
+                        }
+                    } while ((obj = obj.proto));
+                    var obj = this;
+                    do {
+                        if ('message' in obj.properties) {
+                            message = obj.properties['message'];
+                            break;
+                        }
+                    } while ((obj = obj.proto));
+                    cycles.push(this);
+                    try {
+                        name = name && name.toString();
+                        message = message && message.toString();
+                    }
+                    finally {
+                        cycles.pop();
+                    }
+                    return message ? name + ': ' + message : String(name);
+                }
+                // RegExp, Date, and boxed primitives.
+                if (this.data !== null) {
+                    return String(this.data);
+                }
+                return '[object ' + this.class + ']';
+            };
+            /**
+             * Return the object's value.
+             * @return {Interpreter.MyValue} Value.
+             * @override
+             */
+            MyObject.prototype.valueOf = function () {
+                if (this.data === undefined || this.data === null ||
+                    this.data instanceof RegExp) {
+                    return this; // An Object.
+                }
+                if (this.data instanceof Date) {
+                    return this.data.valueOf(); // Milliseconds.
+                }
+                return (this.data); // Boxed primitive.
+            };
+            return MyObject;
+        }());
+        Interpreter.MyObject = MyObject;
+        /**
+         * Class for a state.
+         * @param {!MyObject} node AST node for the state.
+         * @param {!Interpreter.MyObject} scope Scope object for the state.
+         * @constructor
+         */
+        var MyState = (function () {
+            function MyState(node, scope) {
+                this.node = node;
+                this.scope = scope;
+            }
+            return MyState;
+        }());
+        Interpreter.MyState = MyState;
+    })(Interpreter || (Interpreter = {}));
+    // These lines are added for API compatibility
+    Interpreter['Object'] = Interpreter.MyObject;
+    Interpreter['State'] = Interpreter.MyState;
+    // Look for globally-defined acorn
+    try {
+        Interpreter.acorn = (self || global)['acorn'];
+    }
+    catch (e) {
+        // do nothing if we fail
+    }
+    return Interpreter;
+}.apply(exports, __WEBPACK_AMD_DEFINE_ARRAY__),
+				__WEBPACK_AMD_DEFINE_RESULT__ !== undefined && (module.exports = __WEBPACK_AMD_DEFINE_RESULT__));
+
+/* WEBPACK VAR INJECTION */}.call(exports, __webpack_require__(1)))
+
+/***/ }),
+/* 1 */
+/***/ (function(module, exports) {
+
+var g;
+
+// This works in non-strict mode
+g = (function() {
+	return this;
+})();
+
+try {
+	// This works if eval is allowed (see CSP)
+	g = g || Function("return this")() || (1,eval)("this");
+} catch(e) {
+	// This works if the window reference is available
+	if(typeof window === "object")
+		g = window;
+}
+
+// g can still be undefined, but nothing to do about it...
+// We return undefined, instead of nothing here, so it's
+// easier to handle this case. if(!global) { ...}
+
+module.exports = g;
+
+
+/***/ })
+/******/ ]);
+//# sourceMappingURL=interpreter.global.js.map
\ No newline at end of file
diff --git a/dist/interpreter.global.js.map b/dist/interpreter.global.js.map
new file mode 100644
index 00000000..d2082a97
--- /dev/null
+++ b/dist/interpreter.global.js.map
@@ -0,0 +1 @@
+{"version":3,"sources":["webpack:///webpack/bootstrap 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<reference path=\"./_estree.d.ts\" />\n\n// Declare missing functions\ndeclare function escape(s:string): string;\ndeclare function unescape(s:string): string;\n\n/**\n * @license\n * JavaScript Interpreter\n *\n * Copyright 2013-2017 Google Inc. and Jun Kato\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\n/**\n * @fileoverview Interpreting JavaScript in JavaScript.\n * @author fraser@google.com (Neil Fraser)\n * @author i@junkato.jp (Jun Kato)\n */\n\n/**\n * Create a new interpreter.\n * @param {string|!Object} code Raw JavaScript text or AST.\n * @param {Function=} opt_initFunc Optional initialization function.  Used to\n *     define APIs.  When called it is passed the interpreter object and the\n *     global scope object.\n * @constructor\n */\nclass Interpreter {\npublic static acorn: Interpreter.Acorn;\n\nprivate nodeConstructor: Interpreter.NodeConstructor;\npublic ast: ESTree.Program;\npublic global: Interpreter.MyObject;\npublic stateStack: Interpreter.MyState[];\npublic value: Interpreter.MyValue;\nprivate initFunc_: (i: Interpreter, scope: Interpreter.MyObject) => void;\nprivate paused_: boolean;\nprivate polyfills_: string[];\nprivate functionCounter_: number;\nprivate stepFunctions_: { [key: string]: Function };\n\npublic OBJECT: Interpreter.MyObject;\npublic OBJECT_PROTO: Interpreter.MyObject;\npublic FUNCTION: Interpreter.MyObject;\npublic FUNCTION_PROTO: Interpreter.MyObject;\npublic ARRAY: Interpreter.MyObject;\npublic ARRAY_PROTO: Interpreter.MyObject;\npublic REGEXP: Interpreter.MyObject;\npublic REGEXP_PROTO: Interpreter.MyObject;\n\npublic ERROR: Interpreter.MyObject;\npublic EVAL_ERROR: Interpreter.MyObject;\npublic RANGE_ERROR: Interpreter.MyObject;\npublic REFERENCE_ERROR: Interpreter.MyObject;\npublic SYNTAX_ERROR: Interpreter.MyObject;\npublic TYPE_ERROR: Interpreter.MyObject;\npublic URI_ERROR: Interpreter.MyObject;\n\npublic STRING: Interpreter.MyObject;\npublic BOOLEAN: Interpreter.MyObject;\npublic NUMBER: Interpreter.MyObject;\npublic DATE: Interpreter.MyObject;\n\n// The following properties are obsolete.  Do not use.\npublic UNDEFINED: Interpreter.MyObject;\npublic NULL: null;\npublic NAN: number;\npublic TRUE: boolean;\npublic FALSE: boolean;\npublic STRING_EMPTY: string;\npublic NUMBER_ZERO: number;\npublic NUMBER_ONE: number;\n\nconstructor(code: string | ESTree.Program\n    , opt_initFunc?: (i: Interpreter, scope: Interpreter.MyObject) => void) {\n  if (typeof code === 'string') {\n    code = Interpreter.acorn.parse(code, Interpreter.PARSE_OPTIONS);\n  }\n  this.ast = code;\n  this.initFunc_ = opt_initFunc;\n  this.paused_ = false;\n  this.polyfills_ = [];\n  // Unique identifier for native functions.  Used in serialization.\n  this.functionCounter_ = 0;\n  // Map node types to our step function names; a property lookup is faster\n  // than string concatenation with \"step\" prefix.\n  this.stepFunctions_ = Object.create(null);\n  var stepMatch = /^step([A-Z]\\w*)$/;\n  var m;\n  var props = Object.getOwnPropertyNames(Interpreter.prototype);\n  for (var i = 0; i < props.length; i ++) {\n    var methodName = props[i];\n    if ((typeof Interpreter.prototype[methodName] === 'function') &&\n        (m = methodName.match(stepMatch))) {\n      this.stepFunctions_[m[1]] = (<Function>Interpreter.prototype[methodName]).bind(this);\n    }\n  }\n  // Create and initialize the global scope.\n  this.global = this.createScope(this.ast, null);\n  // Run the polyfills.\n  this.ast = Interpreter.acorn.parse(this.polyfills_.join('\\n'), Interpreter.PARSE_OPTIONS);\n  this.polyfills_ = undefined;  // Allow polyfill strings to garbage collect.\n  this.stripLocations_(this.ast, undefined, undefined);\n  var state = new Interpreter.MyState(this.ast, this.global);\n  state.done = false;\n  this.stateStack = [state];\n  this.run();\n  this.value = undefined;\n  // Point at the main program.\n  this.ast = code;\n  var state = new Interpreter.MyState(this.ast, this.global);\n  state.done = false;\n  this.stateStack.length = 0;\n  this.stateStack[0] = state;\n  // Get a handle on Acorn's node_t object.  It's tricky to access.\n  this.nodeConstructor = <Interpreter.NodeConstructor>state.node.constructor;\n  // Preserve publicly properties from being pruned/renamed by JS compilers.\n  // Add others as needed.\n  this['stateStack'] = this.stateStack;\n  this['OBJECT'] = this.OBJECT; this['OBJECT_PROTO'] = this.OBJECT_PROTO;\n  this['FUNCTION'] = this.FUNCTION; this['FUNCTION_PROTO'] = this.FUNCTION_PROTO;\n  this['ARRAY'] = this.ARRAY; this['ARRAY_PROTO'] = this.ARRAY_PROTO;\n  this['REGEXP'] = this.REGEXP; this['REGEXP_PROTO'] = this.REGEXP_PROTO;\n  // The following properties are obsolete.  Do not use.\n  this['UNDEFINED'] = undefined; this['NULL'] = null; this['NAN'] = NaN;\n  this['TRUE'] = true; this['FALSE'] = false; this['STRING_EMPTY'] = '';\n  this['NUMBER_ZERO'] = 0; this['NUMBER_ONE'] = 1;\n};\n\n/**\n * @const {!Object} Configuration used for all Acorn parsing.\n */\nstatic PARSE_OPTIONS = {\n  ecmaVersion: 5\n};\n\n/**\n * Property descriptor of readonly properties.\n */\nstatic READONLY_DESCRIPTOR: Interpreter.MyDescriptor = {\n  configurable: true,\n  enumerable: true,\n  writable: false\n};\n\n/**\n * Property descriptor of non-enumerable properties.\n */\nstatic NONENUMERABLE_DESCRIPTOR: Interpreter.MyDescriptor = {\n  configurable: true,\n  enumerable: false,\n  writable: true\n};\n\n/**\n * Property descriptor of readonly, non-enumerable properties.\n */\nstatic READONLY_NONENUMERABLE_DESCRIPTOR: Interpreter.MyDescriptor = {\n  configurable: true,\n  enumerable: false,\n  writable: false\n};\n\n/**\n * Property descriptor of variables.\n */\nstatic VARIABLE_DESCRIPTOR: Interpreter.MyDescriptor = {\n  configurable: false,\n  enumerable: true,\n  writable: true\n};\n\n/**\n * Unique symbol for indicating that a step has encountered an error, has\n * added it to the stack, and will be thrown within the user's program.\n * When STEP_ERROR is thrown in the JS-Interpreter, the error can be ignored.\n */\nstatic STEP_ERROR = {};\n\n/**\n * Unique symbol for indicating that a reference is a variable on the scope,\n * not an object property.\n */\nstatic SCOPE_REFERENCE = {};\n\n/**\n * For cycle detection in array to string and error conversion;\n * see spec bug github.com/tc39/ecma262/issues/289\n * Since this is for atomic actions only, it can be a class property.\n */\nstatic toStringCycles_ = [];\n\n/**\n * Add more code to the interpreter.\n * @param {string|!Object} code Raw JavaScript text or AST.\n */\npublic appendCode(code: string | ESTree.Node) {\n  var state = this.stateStack[0];\n  if (!state || state.node['type'] !== 'Program') {\n    throw Error('Expecting original AST to start with a Program node.');\n  }\n  if (typeof code === 'string') {\n    code = Interpreter.acorn.parse(code, Interpreter.PARSE_OPTIONS);\n  }\n  if (!code || code['type'] !== 'Program') {\n    throw Error('Expecting new AST to start with a Program node.');\n  }\n  this.populateScope_(code, state.scope);\n  // Append the new program to the old one.\n  for (var i = 0, node; (node = code['body'][i]); i++) {\n    state.node['body'].push(node);\n  }\n  state.done = false;\n};\n\n/**\n * Execute one step of the interpreter.\n * @return {boolean} True if a step was executed, false if no more instructions.\n */\npublic step(): boolean {\n  var stack = this.stateStack;\n  var state = stack[stack.length - 1];\n  if (!state) {\n    return false;\n  }\n  var node = state.node, type = node['type'];\n  if (type === 'Program' && state.done) {\n    return false;\n  } else if (this.paused_) {\n    return true;\n  }\n  try {\n    var nextState = this.stepFunctions_[type](stack, state, node);\n  } catch (e) {\n    // Eat any step errors.  They have been thrown on the stack.\n    if (e !== Interpreter.STEP_ERROR) {\n      // Uh oh.  This is a real error in the JS-Interpreter.  Rethrow.\n      throw e;\n    }\n  }\n  if (nextState) {\n    stack.push(nextState);\n  }\n  if (!node['end']) {\n    // This is polyfill code.  Keep executing until we arrive at user code.\n    return this.step();\n  }\n  return true;\n};\n\n/**\n * Execute the interpreter to program completion.  Vulnerable to infinite loops.\n * @return {boolean} True if a execution is asynchronously blocked,\n *     false if no more instructions.\n */\npublic run() {\n  while (!this.paused_ && this.step()) {}\n  return this.paused_;\n};\n\n/**\n * Initialize the global scope with buitin properties and functions.\n * @param {!Interpreter.MyObject} scope Global scope.\n */\npublic initGlobalScope(scope: Interpreter.MyObject) {\n  // Initialize uneditable global properties.\n  this.setProperty(scope, 'NaN', NaN,\n                   Interpreter.READONLY_DESCRIPTOR);\n  this.setProperty(scope, 'Infinity', Infinity,\n                   Interpreter.READONLY_DESCRIPTOR);\n  this.setProperty(scope, 'undefined', undefined,\n                   Interpreter.READONLY_DESCRIPTOR);\n  this.setProperty(scope, 'window', scope,\n                   Interpreter.READONLY_DESCRIPTOR);\n  this.setProperty(scope, 'this', scope,\n                   Interpreter.READONLY_DESCRIPTOR);\n  this.setProperty(scope, 'self', scope); // Editable.\n\n  // Create the objects which will become Object.prototype and\n  // Function.prototype, which are needed to bootstrap everything else.\n  this.OBJECT_PROTO = new Interpreter.MyObject(null);\n  this.FUNCTION_PROTO = new Interpreter.MyObject(this.OBJECT_PROTO);\n  // Initialize global objects.\n  this.initFunction(scope);\n  this.initObject(scope);\n  // Unable to set scope's parent prior (OBJECT did not exist).\n  // Note that in a browser this would be 'Window', whereas in Node.js it would\n  // be 'Object'.  This interpreter is closer to Node in that it has no DOM.\n  scope.proto = this.OBJECT_PROTO;\n  this.setProperty(scope, 'constructor', this.OBJECT);\n  this.initArray(scope);\n  this.initString(scope);\n  this.initBoolean(scope);\n  this.initNumber(scope);\n  this.initDate(scope);\n  this.initRegExp(scope);\n  this.initError(scope);\n  this.initMath(scope);\n  this.initJSON(scope);\n\n  // Initialize global functions.\n  var thisInterpreter = this;\n  var func = this.createNativeFunction(\n      function(x) {throw EvalError(\"Can't happen\");}, false);\n  func.eval = true;\n  this.setProperty(scope, 'eval', func);\n\n  this.setProperty(scope, 'parseInt',\n      this.createNativeFunction(parseInt, false));\n  this.setProperty(scope, 'parseFloat',\n      this.createNativeFunction(parseFloat, false));\n\n  this.setProperty(scope, 'isNaN',\n      this.createNativeFunction(isNaN, false));\n\n  this.setProperty(scope, 'isFinite',\n      this.createNativeFunction(isFinite, false));\n\n  var strFunctions: any[] = [\n    [escape, 'escape'], [unescape, 'unescape'],\n    [decodeURI, 'decodeURI'], [decodeURIComponent, 'decodeURIComponent'],\n    [encodeURI, 'encodeURI'], [encodeURIComponent, 'encodeURIComponent']\n  ];\n  for (var i = 0; i < strFunctions.length; i++) {\n    var wrapper = (function(nativeFunc: (s: string) => string) {\n      return function(str) {\n        try {\n          return nativeFunc(str);\n        } catch (e) {\n          // decodeURI('%xy') will throw an error.  Catch and rethrow.\n          thisInterpreter.throwException(thisInterpreter.URI_ERROR, e.message);\n        }\n      };\n    })(strFunctions[i][0]);\n    this.setProperty(scope, strFunctions[i][1],\n        this.createNativeFunction(wrapper, false),\n        Interpreter.NONENUMERABLE_DESCRIPTOR);\n  }\n\n  // Run any user-provided initialization.\n  if (this.initFunc_) {\n    this.initFunc_(this, scope);\n  }\n};\n\n/**\n * Initialize the Function class.\n * @param {!Interpreter.MyObject} scope Global scope.\n */\npublic initFunction(scope: Interpreter.MyObject) {\n  var thisInterpreter = this;\n  var wrapper;\n  var identifierRegexp = /^[A-Za-z_$][\\w$]*$/;\n  // Function constructor.\n  wrapper = function(var_args) {\n    if (thisInterpreter.calledWithNew()) {\n      // Called as new Function().\n      var newFunc = <Interpreter.MyObject>this;\n    } else {\n      // Called as Function().\n      var newFunc =\n          thisInterpreter.createObjectProto(thisInterpreter.FUNCTION_PROTO);\n    }\n    if (arguments.length) {\n      var code = String(arguments[arguments.length - 1]);\n    } else {\n      var code = '';\n    }\n    var args: string[] | string = [];\n    for (var i = 0; i < arguments.length - 1; i++) {\n      var name = String(arguments[i]);\n      if (!name.match(identifierRegexp)) {\n        thisInterpreter.throwException(thisInterpreter.SYNTAX_ERROR,\n            'Invalid function argument: ' + name);\n      }\n      args.push(name);\n    }\n    args = args.join(', ');\n    // Interestingly, the scope for constructed functions is the global scope,\n    // even if they were constructed in some other scope.\n    newFunc.parentScope = thisInterpreter.global;\n    // Acorn needs to parse code in the context of a function or else 'return'\n    // statements will be syntax errors.\n    try {\n    var ast = Interpreter.acorn.parse('$ = function(' + args + ') {' + code + '};',\n        Interpreter.PARSE_OPTIONS);\n    } catch (e) {\n      // Acorn threw a SyntaxError.  Rethrow as a trappable error.\n      thisInterpreter.throwException(thisInterpreter.SYNTAX_ERROR,\n          'Invalid code: ' + e.message);\n    }\n    if (ast['body'].length !== 1) {\n      // Function('a', 'return a + 6;}; {alert(1);');\n      thisInterpreter.throwException(thisInterpreter.SYNTAX_ERROR,\n          'Invalid code in function body.');\n    }\n    newFunc.node = ast['body'][0]['expression']['right'];\n    thisInterpreter.setProperty(newFunc, 'length', newFunc.node['length'],\n        Interpreter.READONLY_DESCRIPTOR);\n    return newFunc;\n  };\n  wrapper.id = this.functionCounter_++;\n  this.FUNCTION = this.createObjectProto(this.FUNCTION_PROTO);\n\n  this.setProperty(scope, 'Function', this.FUNCTION);\n  // Manually setup type and prototype because createObj doesn't recognize\n  // this object as a function (this.FUNCTION did not exist).\n  this.setProperty(this.FUNCTION, 'prototype', this.FUNCTION_PROTO);\n  this.FUNCTION.nativeFunc = wrapper;\n\n  // Configure Function.prototype.\n  this.setProperty(this.FUNCTION_PROTO, 'constructor', this.FUNCTION,\n                   Interpreter.NONENUMERABLE_DESCRIPTOR);\n  this.FUNCTION_PROTO.nativeFunc = function() {};\n  this.FUNCTION_PROTO.nativeFunc.id = this.functionCounter_++;\n  this.setProperty(this.FUNCTION_PROTO, 'length', 0,\n      Interpreter.READONLY_DESCRIPTOR);\n\n  var boxThis = function(value) {\n    // In non-strict mode 'this' must be an object.\n    if ((!value || !value.isObject) && !thisInterpreter.getScope().strict) {\n      if (value === undefined || value === null) {\n        // 'Undefined' and 'null' are changed to global object.\n        value = thisInterpreter.global;\n      } else {\n        // Primitives must be boxed in non-strict mode.\n        var box = thisInterpreter.createObjectProto(\n            thisInterpreter.getPrototype(value));\n        box.data = value;\n        value = box;\n      }\n    }\n    return value;\n  };\n\n  wrapper = function(thisArg, args) {\n    var state =\n        thisInterpreter.stateStack[thisInterpreter.stateStack.length - 1];\n    // Rewrite the current 'CallExpression' to apply a different function.\n    state.func_ = this;\n    // Assign the 'this' object.\n    state.funcThis_ = boxThis(thisArg);\n    // Bind any provided arguments.\n    state.arguments_ = [];\n    if (args !== null && args !== undefined) {\n      if (args.isObject) {\n        state.arguments_ = thisInterpreter.pseudoToNative(args);\n      } else {\n        thisInterpreter.throwException(thisInterpreter.TYPE_ERROR,\n            'CreateListFromArrayLike called on non-object');\n      }\n    }\n    state.doneExec_ = false;\n  };\n  this.setNativeFunctionPrototype(this.FUNCTION, 'apply', wrapper);\n\n  wrapper = function(thisArg, var_args) {\n    var state =\n        thisInterpreter.stateStack[thisInterpreter.stateStack.length - 1];\n    // Rewrite the current 'CallExpression' to call a different function.\n    state.func_ = this;\n    // Assign the 'this' object.\n    state.funcThis_ = boxThis(thisArg);\n    // Bind any provided arguments.\n    state.arguments_ = [];\n    for (var i = 1; i < arguments.length; i++) {\n      state.arguments_.push(arguments[i]);\n    }\n    state.doneExec_ = false;\n  };\n  this.setNativeFunctionPrototype(this.FUNCTION, 'call', wrapper);\n\n  this.polyfills_.push(\n// Polyfill copied from:\n// developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_objects/Function/bind\n\"Object.defineProperty(Function.prototype, 'bind',\",\n    \"{configurable: true, writable: true, value:\",\n  \"function(oThis) {\",\n    \"if (typeof this !== 'function') {\",\n      \"throw TypeError('What is trying to be bound is not callable');\",\n    \"}\",\n    \"var aArgs   = Array.prototype.slice.call(arguments, 1),\",\n        \"fToBind = this,\",\n        \"fNOP    = function() {},\",\n        \"fBound  = function() {\",\n          \"return fToBind.apply(this instanceof fNOP\",\n                 \"? this\",\n                 \": oThis,\",\n                 \"aArgs.concat(Array.prototype.slice.call(arguments)));\",\n        \"};\",\n    \"if (this.prototype) {\",\n      \"fNOP.prototype = this.prototype;\",\n    \"}\",\n    \"fBound.prototype = new fNOP();\",\n    \"return fBound;\",\n  \"}\",\n\"});\",\n\"\");\n\n  // Function has no parent to inherit from, so it needs its own mandatory\n  // toString and valueOf functions.\n  wrapper = function() {\n    return this.toString();\n  };\n  this.setNativeFunctionPrototype(this.FUNCTION, 'toString', wrapper);\n  this.setProperty(this.FUNCTION, 'toString',\n      this.createNativeFunction(wrapper, false),\n      Interpreter.NONENUMERABLE_DESCRIPTOR);\n  wrapper = function() {\n    return this.valueOf();\n  };\n  this.setNativeFunctionPrototype(this.FUNCTION, 'valueOf', wrapper);\n  this.setProperty(this.FUNCTION, 'valueOf',\n      this.createNativeFunction(wrapper, false),\n      Interpreter.NONENUMERABLE_DESCRIPTOR);\n};\n\n/**\n * Initialize the Object class.\n * @param {!Interpreter.MyObject} scope Global scope.\n */\npublic initObject(scope: Interpreter.MyObject) {\n  var thisInterpreter = this;\n  var wrapper;\n  // Object constructor.\n  wrapper = function(value) {\n    if (value === undefined || value === null) {\n      // Create a new object.\n      if (thisInterpreter.calledWithNew()) {\n        // Called as new Object().\n        return this;\n      } else {\n        // Called as Object().\n        return thisInterpreter.createObjectProto(thisInterpreter.OBJECT_PROTO);\n      }\n    }\n    if (!value.isObject) {\n      // Wrap the value as an object.\n      var box = thisInterpreter.createObjectProto(\n          thisInterpreter.getPrototype(value));\n      box.data = value;\n      return box;\n    }\n    // Return the provided object.\n    return value;\n  };\n  this.OBJECT = this.createNativeFunction(wrapper, true);\n  // Throw away the created prototype and use the root prototype.\n  this.setProperty(this.OBJECT, 'prototype', this.OBJECT_PROTO);\n  this.setProperty(this.OBJECT_PROTO, 'constructor', this.OBJECT);\n  this.setProperty(scope, 'Object', this.OBJECT);\n\n  /**\n   * Checks if the provided value is null or undefined.\n   * If so, then throw an error in the call stack.\n   * @param {Interpreter.MyValue} value Value to check.\n   */\n  var throwIfNullUndefined = function(value) {\n    if (value === undefined || value === null) {\n      thisInterpreter.throwException(thisInterpreter.TYPE_ERROR,\n          \"Cannot convert '\" + value + \"' to object\");\n    }\n  };\n\n  // Static methods on Object.\n  wrapper = function(obj) {\n    throwIfNullUndefined(obj);\n    var props = obj.isObject ? obj.properties : obj;\n    return thisInterpreter.nativeToPseudo(Object.getOwnPropertyNames(props));\n  };\n  this.setProperty(this.OBJECT, 'getOwnPropertyNames',\n      this.createNativeFunction(wrapper, false),\n      Interpreter.NONENUMERABLE_DESCRIPTOR);\n\n  wrapper = function(obj) {\n    throwIfNullUndefined(obj);\n    if (!obj.isObject) {\n      return thisInterpreter.nativeToPseudo(Object.keys(obj));\n    }\n    return thisInterpreter.nativeToPseudo(Object.keys(obj.properties));\n  };\n  this.setProperty(this.OBJECT, 'keys',\n      this.createNativeFunction(wrapper, false),\n      Interpreter.NONENUMERABLE_DESCRIPTOR);\n\n  wrapper = function(proto) {\n    // Support for the second argument is the responsibility of a polyfill.\n    if (proto === null) {\n      return thisInterpreter.createObjectProto(null);\n    }\n    if (proto === undefined || !proto.isObject) {\n      thisInterpreter.throwException(thisInterpreter.TYPE_ERROR,\n          'Object prototype may only be an Object or null');\n    }\n    return thisInterpreter.createObjectProto(proto);\n  };\n  this.setProperty(this.OBJECT, 'create',\n      this.createNativeFunction(wrapper, false),\n      Interpreter.NONENUMERABLE_DESCRIPTOR);\n\n  // Add a polyfill to handle create's second argument.\n  this.polyfills_.push(\n\"(function() {\",\n  \"var create_ = Object.create;\",\n  \"Object.create = function(proto, props) {\",\n    \"var obj = create_(proto);\",\n    \"props && Object.defineProperties(obj, props);\",\n    \"return obj;\",\n  \"};\",\n\"})();\",\n\"\");\n\n  wrapper = function(obj, prop, descriptor) {\n    prop = String(prop);\n    if (!obj || !obj.isObject) {\n      thisInterpreter.throwException(thisInterpreter.TYPE_ERROR,\n          'Object.defineProperty called on non-object');\n    }\n    if (!descriptor || !descriptor.isObject) {\n      thisInterpreter.throwException(thisInterpreter.TYPE_ERROR,\n          'Property description must be an object');\n    }\n    if (!obj.properties[prop] && obj.preventExtensions) {\n      thisInterpreter.throwException(thisInterpreter.TYPE_ERROR,\n          \"Can't define property '\" + prop + \"', object is not extensible\");\n    }\n    // The polyfill guarantees no inheritance and no getter functions.\n    // Therefore the descriptor properties map is the native object needed.\n    thisInterpreter.setProperty(obj, prop, ReferenceError,\n                                descriptor.properties);\n    return obj;\n  };\n  this.setProperty(this.OBJECT, 'defineProperty',\n      this.createNativeFunction(wrapper, false),\n      Interpreter.NONENUMERABLE_DESCRIPTOR);\n\n  this.polyfills_.push(\n// Flatten the descriptor to remove any inheritance or getter functions.\n\"(function() {\",\n  \"var defineProperty_ = Object.defineProperty;\",\n  \"Object.defineProperty = function(obj, prop, d1) {\",\n    \"var d2 = {};\",\n    \"if ('configurable' in d1) d2.configurable = d1.configurable;\",\n    \"if ('enumerable' in d1) d2.enumerable = d1.enumerable;\",\n    \"if ('writable' in d1) d2.writable = d1.writable;\",\n    \"if ('value' in d1) d2.value = d1.value;\",\n    \"if ('get' in d1) d2.get = d1.get;\",\n    \"if ('set' in d1) d2.set = d1.set;\",\n    \"return defineProperty_(obj, prop, d2);\",\n  \"};\",\n\"})();\",\n\n\"Object.defineProperty(Object, 'defineProperties',\",\n    \"{configurable: true, writable: true, value:\",\n  \"function(obj, props) {\",\n    \"var keys = Object.keys(props);\",\n    \"for (var i = 0; i < keys.length; i++) {\",\n      \"Object.defineProperty(obj, keys[i], props[keys[i]]);\",\n    \"}\",\n    \"return obj;\",\n  \"}\",\n\"});\",\n\"\");\n\n  wrapper = function(obj, prop) {\n    if (!obj || !obj.isObject) {\n      thisInterpreter.throwException(thisInterpreter.TYPE_ERROR,\n          'Object.getOwnPropertyDescriptor called on non-object');\n    }\n    prop = String(prop);\n    if (!(prop in obj.properties)) {\n      return undefined;\n    }\n    var descriptor = Object.getOwnPropertyDescriptor(obj.properties, prop);\n    var getter = obj.getter[prop];\n    var setter = obj.setter[prop];\n\n    if (getter || setter) {\n      descriptor.get = getter;\n      descriptor.set = setter;\n      delete descriptor.value;\n      delete descriptor.writable;\n    }\n    var pseudoDescriptor = <Interpreter.MyObject>thisInterpreter.nativeToPseudo(descriptor);\n    if ('value' in descriptor) {\n      thisInterpreter.setProperty(pseudoDescriptor, 'value', descriptor.value);\n    }\n    return pseudoDescriptor;\n  };\n  this.setProperty(this.OBJECT, 'getOwnPropertyDescriptor',\n      this.createNativeFunction(wrapper, false),\n      Interpreter.NONENUMERABLE_DESCRIPTOR);\n\n  wrapper = function(obj) {\n    throwIfNullUndefined(obj);\n    return thisInterpreter.getPrototype(obj);\n  };\n  this.setProperty(this.OBJECT, 'getPrototypeOf',\n      this.createNativeFunction(wrapper, false),\n      Interpreter.NONENUMERABLE_DESCRIPTOR);\n\n  wrapper = function(obj) {\n    return Boolean(obj) && !obj.preventExtensions;\n  };\n  this.setProperty(this.OBJECT, 'isExtensible',\n      this.createNativeFunction(wrapper, false),\n      Interpreter.NONENUMERABLE_DESCRIPTOR);\n\n  wrapper = function(obj) {\n    if (obj && obj.isObject) {\n      obj.preventExtensions = true;\n    }\n    return obj;\n  };\n  this.setProperty(this.OBJECT, 'preventExtensions',\n      this.createNativeFunction(wrapper, false),\n      Interpreter.NONENUMERABLE_DESCRIPTOR);\n\n  // Instance methods on Object.\n  this.setNativeFunctionPrototype(this.OBJECT, 'toString',\n      Interpreter.MyObject.prototype.toString);\n  this.setNativeFunctionPrototype(this.OBJECT, 'toLocaleString',\n      Interpreter.MyObject.prototype.toString);\n  this.setNativeFunctionPrototype(this.OBJECT, 'valueOf',\n      Interpreter.MyObject.prototype.valueOf);\n\n  wrapper = function(prop) {\n    throwIfNullUndefined(this);\n    if (!this.isObject) {\n      return this.hasOwnProperty(prop);\n    }\n    return String(prop) in this.properties;\n  };\n  this.setNativeFunctionPrototype(this.OBJECT, 'hasOwnProperty', wrapper);\n\n  wrapper = function(prop) {\n    throwIfNullUndefined(this);\n    return Object.prototype.propertyIsEnumerable.call(this.properties, prop);\n  };\n  this.setNativeFunctionPrototype(this.OBJECT, 'propertyIsEnumerable', wrapper);\n\n  wrapper = function(obj) {\n    while (true) {\n      // Note, circular loops shouldn't be possible.\n      obj = thisInterpreter.getPrototype(obj);\n      if (!obj) {\n        // No parent; reached the top.\n        return false;\n      }\n      if (obj === this) {\n        return true;\n      }\n    }\n  };\n  this.setNativeFunctionPrototype(this.OBJECT, 'isPrototypeOf',  wrapper);\n};\n\n/**\n * Initialize the Array class.\n * @param {!Interpreter.MyObject} scope Global scope.\n */\npublic initArray(scope: Interpreter.MyObject) {\n  var thisInterpreter = this;\n  var getInt = function(obj, def) {\n    // Return an integer, or the default.\n    var n = obj ? Math.floor(obj) : def;\n    if (isNaN(n)) {\n      n = def;\n    }\n    return n;\n  };\n  var wrapper;\n  // Array constructor.\n  wrapper = function(var_args) {\n    if (thisInterpreter.calledWithNew()) {\n      // Called as new Array().\n      var newArray = <Interpreter.MyObject>this;\n    } else {\n      // Called as Array().\n      var newArray =\n          thisInterpreter.createObjectProto(thisInterpreter.ARRAY_PROTO);\n    }\n    var first = arguments[0];\n    if (arguments.length === 1 && typeof first === 'number') {\n      if (isNaN(Interpreter.legalArrayLength(first))) {\n        thisInterpreter.throwException(thisInterpreter.RANGE_ERROR,\n                                       'Invalid array length');\n      }\n      newArray.properties.length = first;\n    } else {\n      for (var i = 0; i < arguments.length; i++) {\n        newArray.properties[i] = arguments[i];\n      }\n      newArray.properties.length = i;\n    }\n    return newArray;\n  };\n  this.ARRAY = this.createNativeFunction(wrapper, true);\n  this.ARRAY_PROTO = this.ARRAY.properties['prototype'];\n  this.setProperty(scope, 'Array', this.ARRAY);\n\n  // Static methods on Array.\n  wrapper = function(obj) {\n    return obj && obj.class === 'Array';\n  };\n  this.setProperty(this.ARRAY, 'isArray',\n                   this.createNativeFunction(wrapper, false),\n                   Interpreter.NONENUMERABLE_DESCRIPTOR);\n\n  // Instance methods on Array.\n  wrapper = function() {\n    return Array.prototype.pop.call(this.properties);\n  };\n  this.setNativeFunctionPrototype(this.ARRAY, 'pop', wrapper);\n\n  wrapper = function(var_args) {\n    return Array.prototype.push.apply(this.properties, arguments);\n  };\n  this.setNativeFunctionPrototype(this.ARRAY, 'push', wrapper);\n\n  wrapper = function() {\n    return Array.prototype.shift.call(this.properties);\n  };\n  this.setNativeFunctionPrototype(this.ARRAY, 'shift', wrapper);\n\n  wrapper = function(var_args) {\n    return Array.prototype.unshift.apply(this.properties, arguments);\n  };\n  this.setNativeFunctionPrototype(this.ARRAY, 'unshift', wrapper);\n\n  wrapper = function() {\n    Array.prototype.reverse.call(this.properties);\n    return this;\n  };\n  this.setNativeFunctionPrototype(this.ARRAY, 'reverse', wrapper);\n\n  wrapper = function(index, howmany /*, var_args*/) {\n    var list = Array.prototype.splice.apply(this.properties, arguments);\n    return thisInterpreter.nativeToPseudo(list);\n  };\n  this.setNativeFunctionPrototype(this.ARRAY, 'splice', wrapper);\n\n  wrapper = function(opt_begin, opt_end) {\n    var list = Array.prototype.slice.call(this.properties, opt_begin, opt_end);\n    return thisInterpreter.nativeToPseudo(list);\n  };\n  this.setNativeFunctionPrototype(this.ARRAY, 'slice', wrapper);\n\n  wrapper = function(opt_separator) {\n    return Array.prototype.join.call(this.properties, opt_separator);\n  };\n  this.setNativeFunctionPrototype(this.ARRAY, 'join', wrapper);\n\n  wrapper = function(var_args) {\n    var list = [];\n    var length = 0;\n    // Start by copying the current array.\n    var iLength = thisInterpreter.getProperty(this, 'length');\n    for (var i = 0; i < iLength; i++) {\n      if (thisInterpreter.hasProperty(this, i)) {\n        var element = thisInterpreter.getProperty(this, i);\n        list[length] = element;\n      }\n      length++;\n    }\n    // Loop through all arguments and copy them in.\n    for (var i = 0; i < arguments.length; i++) {\n      var value = arguments[i];\n      if (thisInterpreter.isa(value, thisInterpreter.ARRAY)) {\n        var jLength = thisInterpreter.getProperty(value, 'length');\n        for (var j = 0; j < jLength; j++) {\n          if (thisInterpreter.hasProperty(value, j)) {\n            list[length] = thisInterpreter.getProperty(value, j);\n          }\n          length++;\n        }\n      } else {\n        list[length] = value;\n      }\n    }\n    return thisInterpreter.nativeToPseudo(list);\n  };\n  this.setNativeFunctionPrototype(this.ARRAY, 'concat', wrapper);\n\n  wrapper = function(searchElement, opt_fromIndex) {\n    return Array.prototype.indexOf.apply(this.properties, arguments);\n  };\n  this.setNativeFunctionPrototype(this.ARRAY, 'indexOf', wrapper);\n\n  wrapper = function(searchElement, opt_fromIndex) {\n    return Array.prototype.lastIndexOf.apply(this.properties, arguments);\n  };\n  this.setNativeFunctionPrototype(this.ARRAY, 'lastIndexOf', wrapper);\n\n  wrapper = function() {\n    Array.prototype.sort.call(this.properties);\n    return this;\n  };\n  this.setNativeFunctionPrototype(this.ARRAY, 'sort', wrapper);\n\n  this.polyfills_.push(\n// Polyfill copied from:\n// developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Array/every\n\"Object.defineProperty(Array.prototype, 'every',\",\n    \"{configurable: true, writable: true, value:\",\n  \"function(callbackfn, thisArg) {\",\n    \"if (!this || typeof callbackfn !== 'function') throw TypeError();\",\n    \"var T, k;\",\n    \"var O = Object(this);\",\n    \"var len = O.length >>> 0;\",\n    \"if (arguments.length > 1) T = thisArg;\",\n    \"k = 0;\",\n    \"while (k < len) {\",\n      \"if (k in O && !callbackfn.call(T, O[k], k, O)) return false;\",\n      \"k++;\",\n    \"}\",\n    \"return true;\",\n  \"}\",\n\"});\",\n\n// Polyfill copied from:\n// developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Array/filter\n\"Object.defineProperty(Array.prototype, 'filter',\",\n    \"{configurable: true, writable: true, value:\",\n  \"function(fun/*, thisArg*/) {\",\n    \"if (this === void 0 || this === null || typeof fun !== 'function') throw TypeError();\",\n    \"var t = Object(this);\",\n    \"var len = t.length >>> 0;\",\n    \"var res = [];\",\n    \"var thisArg = arguments.length >= 2 ? arguments[1] : void 0;\",\n    \"for (var i = 0; i < len; i++) {\",\n      \"if (i in t) {\",\n        \"var val = t[i];\",\n        \"if (fun.call(thisArg, val, i, t)) res.push(val);\",\n      \"}\",\n    \"}\",\n    \"return res;\",\n  \"}\",\n\"});\",\n\n// Polyfill copied from:\n// developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Array/forEach\n\"Object.defineProperty(Array.prototype, 'forEach',\",\n    \"{configurable: true, writable: true, value:\",\n  \"function(callback, thisArg) {\",\n    \"if (!this || typeof callback !== 'function') throw TypeError();\",\n    \"var T, k;\",\n    \"var O = Object(this);\",\n    \"var len = O.length >>> 0;\",\n    \"if (arguments.length > 1) T = thisArg;\",\n    \"k = 0;\",\n    \"while (k < len) {\",\n      \"if (k in O) callback.call(T, O[k], k, O);\",\n      \"k++;\",\n    \"}\",\n  \"}\",\n\"});\",\n\n// Polyfill copied from:\n// developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Array/map\n\"Object.defineProperty(Array.prototype, 'map',\",\n    \"{configurable: true, writable: true, value:\",\n  \"function(callback, thisArg) {\",\n    \"if (!this || typeof callback !== 'function') new TypeError;\",\n    \"var T, A, k;\",\n    \"var O = Object(this);\",\n    \"var len = O.length >>> 0;\",\n    \"if (arguments.length > 1) T = thisArg;\",\n    \"A = new Array(len);\",\n    \"k = 0;\",\n    \"while (k < len) {\",\n      \"if (k in O) A[k] = callback.call(T, O[k], k, O);\",\n      \"k++;\",\n    \"}\",\n    \"return A;\",\n  \"}\",\n\"});\",\n\n// Polyfill copied from:\n// developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Array/Reduce\n\"Object.defineProperty(Array.prototype, 'reduce',\",\n    \"{configurable: true, writable: true, value:\",\n  \"function(callback /*, initialValue*/) {\",\n    \"if (!this || typeof callback !== 'function') throw TypeError();\",\n    \"var t = Object(this), len = t.length >>> 0, k = 0, value;\",\n    \"if (arguments.length === 2) {\",\n      \"value = arguments[1];\",\n    \"} else {\",\n      \"while (k < len && !(k in t)) k++;\",\n      \"if (k >= len) {\",\n        \"throw TypeError('Reduce of empty array with no initial value');\",\n      \"}\",\n      \"value = t[k++];\",\n    \"}\",\n    \"for (; k < len; k++) {\",\n      \"if (k in t) value = callback(value, t[k], k, t);\",\n    \"}\",\n    \"return value;\",\n  \"}\",\n\"});\",\n\n// Polyfill copied from:\n// developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Array/ReduceRight\n\"Object.defineProperty(Array.prototype, 'reduceRight',\",\n    \"{configurable: true, writable: true, value:\",\n  \"function(callback /*, initialValue*/) {\",\n    \"if (null === this || 'undefined' === typeof this || 'function' !== typeof callback) throw TypeError();\",\n    \"var t = Object(this), len = t.length >>> 0, k = len - 1, value;\",\n    \"if (arguments.length >= 2) {\",\n      \"value = arguments[1];\",\n    \"} else {\",\n      \"while (k >= 0 && !(k in t)) k--;\",\n      \"if (k < 0) {\",\n        \"throw TypeError('Reduce of empty array with no initial value');\",\n      \"}\",\n      \"value = t[k--];\",\n    \"}\",\n    \"for (; k >= 0; k--) {\",\n      \"if (k in t) value = callback(value, t[k], k, t);\",\n    \"}\",\n    \"return value;\",\n  \"}\",\n\"});\",\n\n// Polyfill copied from:\n// developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Array/some\n\"Object.defineProperty(Array.prototype, 'some',\",\n    \"{configurable: true, writable: true, value:\",\n  \"function(fun/*, thisArg*/) {\",\n    \"if (!this || typeof fun !== 'function') throw TypeError();\",\n    \"var t = Object(this);\",\n    \"var len = t.length >>> 0;\",\n    \"var thisArg = arguments.length >= 2 ? arguments[1] : void 0;\",\n    \"for (var i = 0; i < len; i++) {\",\n      \"if (i in t && fun.call(thisArg, t[i], i, t)) {\",\n        \"return true;\",\n      \"}\",\n    \"}\",\n    \"return false;\",\n  \"}\",\n\"});\",\n\n\n\"(function() {\",\n  \"var sort_ = Array.prototype.sort;\",\n  \"Array.prototype.sort = function(opt_comp) {\",\n    // Fast native sort.\n    \"if (typeof opt_comp !== 'function') {\",\n      \"return sort_.call(this);\",\n    \"}\",\n    // Slow bubble sort.\n    \"for (var i = 0; i < this.length; i++) {\",\n      \"var changes = 0;\",\n      \"for (var j = 0; j < this.length - i - 1; j++) {\",\n        \"if (opt_comp(this[j], this[j + 1]) > 0) {\",\n          \"var swap = this[j];\",\n          \"this[j] = this[j + 1];\",\n          \"this[j + 1] = swap;\",\n          \"changes++;\",\n        \"}\",\n      \"}\",\n      \"if (!changes) break;\",\n    \"}\",\n    \"return this;\",\n  \"};\",\n\"})();\",\n\n\"Object.defineProperty(Array.prototype, 'toLocaleString',\",\n    \"{configurable: true, writable: true, value:\",\n  \"function() {\",\n    \"var out = [];\",\n    \"for (var i = 0; i < this.length; i++) {\",\n      \"out[i] = (this[i] === null || this[i] === undefined) ? '' : this[i].toLocaleString();\",\n    \"}\",\n    \"return out.join(',');\",\n  \"}\",\n\"});\",\n\"\");\n};\n\n/**\n * Initialize the String class.\n * @param {!Interpreter.MyObject} scope Global scope.\n */\npublic initString(scope: Interpreter.MyObject) {\n  var thisInterpreter = this;\n  var wrapper;\n  // String constructor.\n  wrapper = function(value) {\n    value = String(value);\n    if (thisInterpreter.calledWithNew()) {\n      // Called as new String().\n      this.data = value;\n      return this;\n    } else {\n      // Called as String().\n      return value;\n    }\n  };\n  this.STRING = this.createNativeFunction(wrapper, true);\n  this.setProperty(scope, 'String', this.STRING);\n\n  // Static methods on String.\n  this.setProperty(this.STRING, 'fromCharCode',\n      this.createNativeFunction(String.fromCharCode, false),\n      Interpreter.NONENUMERABLE_DESCRIPTOR);\n\n  // Instance methods on String.\n  // Methods with exclusively primitive arguments.\n  var functions = ['trim', 'toLowerCase', 'toUpperCase',\n      'toLocaleLowerCase', 'toLocaleUpperCase', 'charAt', 'charCodeAt',\n      'substring', 'slice', 'substr', 'indexOf', 'lastIndexOf', 'concat'];\n  for (var i = 0; i < functions.length; i++) {\n    this.setNativeFunctionPrototype(this.STRING, functions[i],\n                                    String.prototype[functions[i]]);\n  }\n\n  wrapper = function(compareString, locales, options) {\n    locales = locales ? thisInterpreter.pseudoToNative(locales) : undefined;\n    options = options ? thisInterpreter.pseudoToNative(options) : undefined;\n    return String(this).localeCompare(compareString, locales, options);\n  };\n  this.setNativeFunctionPrototype(this.STRING, 'localeCompare', wrapper);\n\n  wrapper = function(separator, limit) {\n    if (thisInterpreter.isa(separator, thisInterpreter.REGEXP)) {\n      separator = separator.data;\n    }\n    var jsList = String(this).split(separator, limit);\n    return thisInterpreter.nativeToPseudo(jsList);\n  };\n  this.setNativeFunctionPrototype(this.STRING, 'split', wrapper);\n\n  wrapper = function(regexp) {\n    regexp = regexp ? regexp.data : undefined;\n    var match = String(this).match(regexp);\n    if (!match) {\n      return null;\n    }\n    return thisInterpreter.nativeToPseudo(match);\n  };\n  this.setNativeFunctionPrototype(this.STRING, 'match', wrapper);\n\n  wrapper = function(regexp) {\n    if (thisInterpreter.isa(regexp, thisInterpreter.REGEXP)) {\n      regexp = regexp.data;\n    }\n    return String(this).search(regexp);\n  };\n  this.setNativeFunctionPrototype(this.STRING, 'search', wrapper);\n\n  wrapper = function(substr, newSubstr) {\n    // Support for function replacements is the responsibility of a polyfill.\n    return String(this).replace(substr.data || substr, newSubstr);\n  };\n  this.setNativeFunctionPrototype(this.STRING, 'replace', wrapper);\n  // Add a polyfill to handle replace's second argument being a function.\n  this.polyfills_.push(\n\"(function() {\",\n  \"var replace_ = String.prototype.replace;\",\n  \"String.prototype.replace = function(substr, newSubstr) {\",\n    \"if (typeof newSubstr !== 'function') {\",\n      // string.replace(string|regexp, string)\n      \"return replace_.call(this, substr, newSubstr);\",\n    \"}\",\n    \"var str = this;\",\n    \"if (substr instanceof RegExp) {\",  // string.replace(regexp, function)\n      \"var subs = [];\",\n      \"var m = substr.exec(str);\",\n      \"while (m) {\",\n        \"m.push(m.index, str);\",\n        \"var inject = newSubstr.apply(null, m);\",\n        \"subs.push([m.index, m[0].length, inject]);\",\n        \"m = substr.global ? substr.exec(str) : null;\",\n      \"}\",\n      \"for (var i = subs.length - 1; i >= 0; i--) {\",\n        \"str = str.substring(0, subs[i][0]) + subs[i][2] + \" +\n            \"str.substring(subs[i][0] + subs[i][1]);\",\n      \"}\",\n    \"} else {\",                         // string.replace(string, function)\n      \"var i = str.indexOf(substr);\",\n      \"if (i !== -1) {\",\n        \"var inject = newSubstr(str.substr(i, substr.length), i, str);\",\n        \"str = str.substring(0, i) + inject + \" +\n            \"str.substring(i + substr.length);\",\n      \"}\",\n    \"}\",\n    \"return str;\",\n  \"};\",\n\"})();\",\n\"\");\n};\n\n/**\n * Initialize the Boolean class.\n * @param {!Interpreter.MyObject} scope Global scope.\n */\npublic initBoolean(scope: Interpreter.MyObject) {\n  var thisInterpreter = this;\n  var wrapper;\n  // Boolean constructor.\n  wrapper = function(value) {\n    value = Boolean(value);\n    if (thisInterpreter.calledWithNew()) {\n      // Called as new Boolean().\n      this.data = value;\n      return this;\n    } else {\n      // Called as Boolean().\n      return value;\n    }\n  };\n  this.BOOLEAN = this.createNativeFunction(wrapper, true);\n  this.setProperty(scope, 'Boolean', this.BOOLEAN);\n};\n\n/**\n * Initialize the Number class.\n * @param {!Interpreter.MyObject} scope Global scope.\n */\npublic initNumber(scope: Interpreter.MyObject) {\n  var thisInterpreter = this;\n  var wrapper;\n  // Number constructor.\n  wrapper = function(value) {\n    value = Number(value);\n    if (thisInterpreter.calledWithNew()) {\n      // Called as new Number().\n      this.data = value;\n      return this;\n    } else {\n      // Called as Number().\n      return value;\n    }\n  };\n  this.NUMBER = this.createNativeFunction(wrapper, true);\n  this.setProperty(scope, 'Number', this.NUMBER);\n\n  var numConsts = ['MAX_VALUE', 'MIN_VALUE', 'NaN', 'NEGATIVE_INFINITY',\n                   'POSITIVE_INFINITY'];\n  for (var i = 0; i < numConsts.length; i++) {\n    this.setProperty(this.NUMBER, numConsts[i], Number[numConsts[i]],\n        Interpreter.READONLY_NONENUMERABLE_DESCRIPTOR);\n  }\n\n  // Instance methods on Number.\n  wrapper = function(fractionDigits) {\n    try {\n      return Number(this).toExponential(fractionDigits);\n    } catch (e) {\n      // Throws if fractionDigits isn't within 0-20.\n      thisInterpreter.throwException(thisInterpreter.ERROR, e.message);\n    }\n  };\n  this.setNativeFunctionPrototype(this.NUMBER, 'toExponential', wrapper);\n\n  wrapper = function(digits) {\n    try {\n      return Number(this).toFixed(digits);\n    } catch (e) {\n      // Throws if digits isn't within 0-20.\n      thisInterpreter.throwException(thisInterpreter.ERROR, e.message);\n    }\n  };\n  this.setNativeFunctionPrototype(this.NUMBER, 'toFixed', wrapper);\n\n  wrapper = function(precision) {\n    try {\n      return Number(this).toPrecision(precision);\n    } catch (e) {\n      // Throws if precision isn't within range (depends on implementation).\n      thisInterpreter.throwException(thisInterpreter.ERROR, e.message);\n    }\n  };\n  this.setNativeFunctionPrototype(this.NUMBER, 'toPrecision', wrapper);\n\n  wrapper = function(radix) {\n    try {\n      return Number(this).toString(radix);\n    } catch (e) {\n      // Throws if radix isn't within 2-36.\n      thisInterpreter.throwException(thisInterpreter.ERROR, e.message);\n    }\n  };\n  this.setNativeFunctionPrototype(this.NUMBER, 'toString', wrapper);\n\n  wrapper = function(locales, options) {\n    locales = locales ? thisInterpreter.pseudoToNative(locales) : undefined;\n    options = options ? thisInterpreter.pseudoToNative(options) : undefined;\n    return Number(this).toLocaleString(locales, options);\n  };\n  this.setNativeFunctionPrototype(this.NUMBER, 'toLocaleString', wrapper);\n};\n\n/**\n * Initialize the Date class.\n * @param {!Interpreter.MyObject} scope Global scope.\n */\npublic initDate(scope: Interpreter.MyObject) {\n  var thisInterpreter = this;\n  var wrapper;\n  // Date constructor.\n  wrapper = function(value, var_args) {\n    if (!thisInterpreter.calledWithNew()) {\n      // Called as Date().\n      // Calling Date() as a function returns a string, no arguments are heeded.\n      return Date();\n    }\n    // Called as new Date().\n    var args = [null].concat([].slice.call(arguments));\n    this.data = new (Function.prototype.bind.apply(Date, args));\n    return this;\n  };\n  this.DATE = this.createNativeFunction(wrapper, true);\n  this.setProperty(scope, 'Date', this.DATE);\n\n  // Static methods on Date.\n  this.setProperty(this.DATE, 'now', this.createNativeFunction(Date.now, false),\n      Interpreter.NONENUMERABLE_DESCRIPTOR);\n\n  this.setProperty(this.DATE, 'parse',\n      this.createNativeFunction(Date.parse, false),\n      Interpreter.NONENUMERABLE_DESCRIPTOR);\n\n  this.setProperty(this.DATE, 'UTC', this.createNativeFunction(Date.UTC, false),\n      Interpreter.NONENUMERABLE_DESCRIPTOR);\n\n  // Instance methods on Date.\n  var functions = ['getDate', 'getDay', 'getFullYear', 'getHours',\n      'getMilliseconds', 'getMinutes', 'getMonth', 'getSeconds', 'getTime',\n      'getTimezoneOffset', 'getUTCDate', 'getUTCDay', 'getUTCFullYear',\n      'getUTCHours', 'getUTCMilliseconds', 'getUTCMinutes', 'getUTCMonth',\n      'getUTCSeconds', 'getYear',\n      'setDate', 'setFullYear', 'setHours', 'setMilliseconds',\n      'setMinutes', 'setMonth', 'setSeconds', 'setTime', 'setUTCDate',\n      'setUTCFullYear', 'setUTCHours', 'setUTCMilliseconds', 'setUTCMinutes',\n      'setUTCMonth', 'setUTCSeconds', 'setYear',\n      'toDateString', 'toISOString', 'toJSON', 'toGMTString',\n      'toLocaleDateString', 'toLocaleString', 'toLocaleTimeString',\n      'toTimeString', 'toUTCString'];\n  for (var i = 0; i < functions.length; i++) {\n    wrapper = (function(nativeFunc) {\n      return function(var_args) {\n        var args = [];\n        for (var i = 0; i < arguments.length; i++) {\n          args[i] = thisInterpreter.pseudoToNative(arguments[i]);\n        }\n        return this.data[nativeFunc].apply(this.data, args);\n      };\n    })(functions[i]);\n    this.setNativeFunctionPrototype(this.DATE, functions[i], wrapper);\n  }\n};\n\n/**\n * Initialize Regular Expression object.\n * @param {!Interpreter.MyObject} scope Global scope.\n */\npublic initRegExp(scope: Interpreter.MyObject) {\n  var thisInterpreter = this;\n  var wrapper;\n  // RegExp constructor.\n  wrapper = function(pattern, flags) {\n    if (thisInterpreter.calledWithNew()) {\n      // Called as new RegExp().\n      var rgx = <Interpreter.MyObject>this;\n    } else {\n      // Called as RegExp().\n      var rgx = thisInterpreter.createObjectProto(thisInterpreter.REGEXP_PROTO);\n    }\n    pattern = pattern ? pattern.toString() : '';\n    flags = flags ? flags.toString() : '';\n    thisInterpreter.populateRegExp(rgx, new RegExp(pattern, flags));\n    return rgx;\n  };\n  this.REGEXP = this.createNativeFunction(wrapper, true);\n  this.REGEXP_PROTO = this.REGEXP.properties['prototype'];\n  this.setProperty(scope, 'RegExp', this.REGEXP);\n\n  this.setProperty(this.REGEXP.properties['prototype'], 'global', undefined,\n      Interpreter.READONLY_NONENUMERABLE_DESCRIPTOR);\n  this.setProperty(this.REGEXP.properties['prototype'], 'ignoreCase', undefined,\n      Interpreter.READONLY_NONENUMERABLE_DESCRIPTOR);\n  this.setProperty(this.REGEXP.properties['prototype'], 'multiline', undefined,\n      Interpreter.READONLY_NONENUMERABLE_DESCRIPTOR);\n  this.setProperty(this.REGEXP.properties['prototype'], 'source', '(?:)',\n      Interpreter.READONLY_NONENUMERABLE_DESCRIPTOR);\n\n  wrapper = function(str) {\n    return this.data.test(str);\n  };\n  this.setNativeFunctionPrototype(this.REGEXP, 'test', wrapper);\n\n  wrapper = function(str) {\n    str = str.toString();\n    // Get lastIndex from wrapped regex, since this is settable.\n    this.data.lastIndex =\n        Number(thisInterpreter.getProperty(this, 'lastIndex'));\n    var match = this.data.exec(str);\n    thisInterpreter.setProperty(this, 'lastIndex', this.data.lastIndex);\n\n    if (match) {\n      var result =\n          thisInterpreter.createObjectProto(thisInterpreter.ARRAY_PROTO);\n      for (var i = 0; i < match.length; i++) {\n        thisInterpreter.setProperty(result, i, match[i]);\n      }\n      // match has additional properties.\n      thisInterpreter.setProperty(result, 'index', match.index);\n      thisInterpreter.setProperty(result, 'input', match.input);\n      return result;\n    }\n    return null;\n  };\n  this.setNativeFunctionPrototype(this.REGEXP, 'exec', wrapper);\n};\n\n/**\n * Initialize the Error class.\n * @param {!Interpreter.MyObject} scope Global scope.\n */\npublic initError(scope: Interpreter.MyObject) {\n  var thisInterpreter = this;\n  // Error constructor.\n  this.ERROR = this.createNativeFunction(function(opt_message) {\n    if (thisInterpreter.calledWithNew()) {\n      // Called as new Error().\n      var newError = <Interpreter.MyObject>this;\n    } else {\n      // Called as Error().\n      var newError = thisInterpreter.createObject(thisInterpreter.ERROR);\n    }\n    if (opt_message) {\n      thisInterpreter.setProperty(newError, 'message', String(opt_message),\n          Interpreter.NONENUMERABLE_DESCRIPTOR);\n    }\n    return newError;\n  }, true);\n  this.setProperty(scope, 'Error', this.ERROR);\n  this.setProperty(this.ERROR.properties['prototype'], 'message', '',\n      Interpreter.NONENUMERABLE_DESCRIPTOR);\n  this.setProperty(this.ERROR.properties['prototype'], 'name', 'Error',\n      Interpreter.NONENUMERABLE_DESCRIPTOR);\n\n  var createErrorSubclass = function(name) {\n    var constructor = thisInterpreter.createNativeFunction(\n        function(opt_message) {\n          if (thisInterpreter.calledWithNew()) {\n            // Called as new XyzError().\n            var newError = <Interpreter.MyObject>this;\n          } else {\n            // Called as XyzError().\n            var newError = thisInterpreter.createObject(constructor);\n          }\n          if (opt_message) {\n            thisInterpreter.setProperty(newError, 'message',\n                String(opt_message), Interpreter.NONENUMERABLE_DESCRIPTOR);\n          }\n          return newError;\n        }, true);\n    thisInterpreter.setProperty(constructor, 'prototype',\n        thisInterpreter.createObject(thisInterpreter.ERROR));\n    thisInterpreter.setProperty(constructor.properties['prototype'], 'name',\n        name, Interpreter.NONENUMERABLE_DESCRIPTOR);\n    thisInterpreter.setProperty(scope, name, constructor);\n\n    return constructor;\n  };\n\n  this.EVAL_ERROR = createErrorSubclass('EvalError');\n  this.RANGE_ERROR = createErrorSubclass('RangeError');\n  this.REFERENCE_ERROR = createErrorSubclass('ReferenceError');\n  this.SYNTAX_ERROR = createErrorSubclass('SyntaxError');\n  this.TYPE_ERROR = createErrorSubclass('TypeError');\n  this.URI_ERROR = createErrorSubclass('URIError');\n};\n\n/**\n * Initialize Math object.\n * @param {!Interpreter.MyObject} scope Global scope.\n */\npublic initMath(scope: Interpreter.MyObject) {\n  var thisInterpreter = this;\n  var myMath = this.createObjectProto(this.OBJECT_PROTO);\n  this.setProperty(scope, 'Math', myMath);\n  var mathConsts = ['E', 'LN2', 'LN10', 'LOG2E', 'LOG10E', 'PI',\n                    'SQRT1_2', 'SQRT2'];\n  for (var i = 0; i < mathConsts.length; i++) {\n    this.setProperty(myMath, mathConsts[i], Math[mathConsts[i]],\n        Interpreter.READONLY_NONENUMERABLE_DESCRIPTOR);\n  }\n  var numFunctions = ['abs', 'acos', 'asin', 'atan', 'atan2', 'ceil', 'cos',\n                      'exp', 'floor', 'log', 'max', 'min', 'pow', 'random',\n                      'round', 'sin', 'sqrt', 'tan'];\n  for (var i = 0; i < numFunctions.length; i++) {\n    this.setProperty(myMath, numFunctions[i],\n        this.createNativeFunction(Math[numFunctions[i]], false),\n        Interpreter.NONENUMERABLE_DESCRIPTOR);\n  }\n};\n\n/**\n * Initialize JSON object.\n * @param {!Interpreter.MyObject} scope Global scope.\n */\npublic initJSON(scope: Interpreter.MyObject) {\n  var thisInterpreter = this;\n  var myJSON = thisInterpreter.createObjectProto(this.OBJECT_PROTO);\n  this.setProperty(scope, 'JSON', myJSON);\n\n  var wrapper = function(text) {\n    try {\n      var nativeObj = JSON.parse(text.toString());\n    } catch (e) {\n      thisInterpreter.throwException(thisInterpreter.SYNTAX_ERROR, e.message);\n    }\n    return thisInterpreter.nativeToPseudo(nativeObj);\n  };\n  this.setProperty(myJSON, 'parse', this.createNativeFunction(wrapper, false));\n\n  wrapper = function(value) {\n    var nativeObj = thisInterpreter.pseudoToNative(value);\n    try {\n      var str = JSON.stringify(nativeObj);\n    } catch (e) {\n      thisInterpreter.throwException(thisInterpreter.TYPE_ERROR, e.message);\n    }\n    return str;\n  };\n  this.setProperty(myJSON, 'stringify',\n      this.createNativeFunction(wrapper, false));\n};\n\n/**\n * Is an object of a certain class?\n * @param {Interpreter.MyValue} child Object to check.\n * @param {Interpreter.MyObject} constructor Constructor of object.\n * @return {boolean} True if object is the class or inherits from it.\n *     False otherwise.\n */\npublic isa(child: Interpreter.MyValue, constructor: Interpreter.MyObject) {\n  if (child === null || child === undefined || !constructor) {\n    return false;\n  }\n  var proto = constructor.properties['prototype'];\n  if (child === proto) {\n    return true;\n  }\n  // The first step up the prototype chain is harder since the child might be\n  // a primitive value.  Subsequent steps can just follow the .proto property.\n  var childObj = this.getPrototype(child);\n  while (childObj) {\n    if (childObj === proto) {\n      return true;\n    }\n    childObj = childObj.proto;\n  }\n  return false;\n};\n\n/**\n * Is a value a legal integer for an array length?\n * @param {Interpreter.MyValue} x Value to check.\n * @return {number} Zero, or a positive integer if the value can be\n *     converted to such.  NaN otherwise.\n */\nstatic legalArrayLength(x: Interpreter.MyValue) {\n  var n = <number>x >>> 0;\n  // Array length must be between 0 and 2^32-1 (inclusive).\n  return (n === Number(x)) ? n : NaN;\n};\n\n/**\n * Is a value a legal integer for an array index?\n * @param {Interpreter.MyValue} x Value to check.\n * @return {number} Zero, or a positive integer if the value can be\n *     converted to such.  NaN otherwise.\n */\nstatic legalArrayIndex(x: Interpreter.MyValue) {\n  var n = <number>x >>> 0;\n  // Array index cannot be 2^32-1, otherwise length would be 2^32.\n  // 0xffffffff is 2^32-1.\n  return (String(n) === String(x) && n !== 0xffffffff) ? n : NaN;\n};\n\n/**\n * Create a new data object based on a constructor's prototype.\n * @param {Interpreter.MyObject} constructor Parent constructor function,\n *     or null if scope object.\n * @return {!Interpreter.MyObject} New data object.\n */\npublic createObject(constructor: Interpreter.MyObject) {\n  return this.createObjectProto(constructor &&\n                                constructor.properties['prototype']);\n};\n\n/**\n * Create a new data object based on a prototype.\n * @param {Interpreter.MyObject} proto Prototype object.\n * @return {!Interpreter.MyObject} New data object.\n */\npublic createObjectProto(proto: Interpreter.MyObject) {\n  var obj = new Interpreter.MyObject(proto);\n  // Functions have prototype objects.\n  if (this.isa(obj, this.FUNCTION)) {\n    this.setProperty(obj, 'prototype',\n                     this.createObjectProto(this.OBJECT_PROTO || null));\n    obj.class = 'Function';\n  }\n  // Arrays have length.\n  if (this.isa(obj, this.ARRAY)) {\n    this.setProperty(obj, 'length', 0,\n        {configurable: false, enumerable: false, writable: true});\n    obj.class = 'Array';\n  }\n  if (this.isa(obj, this.ERROR)) {\n    obj.class = 'Error';\n  }\n  return obj;\n};\n\n/**\n * Initialize a pseudo regular expression object based on a native regular\n * expression object.\n * @param {!Interpreter.MyObject} pseudoRegexp The existing object to set.\n * @param {!RegExp} nativeRegexp The native regular expression.\n */\npublic populateRegExp(pseudoRegexp: Interpreter.MyObject, nativeRegexp: RegExp) {\n  pseudoRegexp.data = nativeRegexp;\n  // lastIndex is settable, all others are read-only attributes\n  this.setProperty(pseudoRegexp, 'lastIndex', nativeRegexp.lastIndex,\n      Interpreter.NONENUMERABLE_DESCRIPTOR);\n  this.setProperty(pseudoRegexp, 'source', nativeRegexp.source,\n      Interpreter.READONLY_NONENUMERABLE_DESCRIPTOR);\n  this.setProperty(pseudoRegexp, 'global', nativeRegexp.global,\n      Interpreter.READONLY_NONENUMERABLE_DESCRIPTOR);\n  this.setProperty(pseudoRegexp, 'ignoreCase', nativeRegexp.ignoreCase,\n      Interpreter.READONLY_NONENUMERABLE_DESCRIPTOR);\n  this.setProperty(pseudoRegexp, 'multiline', nativeRegexp.multiline,\n      Interpreter.READONLY_NONENUMERABLE_DESCRIPTOR);\n};\n\n/**\n * Create a new function.\n * @param {!Object} node AST node defining the function.\n * @param {!Object} scope Parent scope.\n * @return {!Interpreter.MyObject} New function.\n */\npublic createFunction(node: ESTree.FunctionDeclaration, scope: Interpreter.MyObject) {\n  var func = this.createObjectProto(this.FUNCTION_PROTO);\n  func.parentScope = scope;\n  func.node = node;\n  this.setProperty(func, 'length', func.node['params'].length,\n      Interpreter.READONLY_DESCRIPTOR);\n  return func;\n};\n\n/**\n * Create a new native function.\n * @param {!Function} nativeFunc JavaScript function.\n * @param {boolean=} opt_constructor If true, the function's\n * prototype will have its constructor property set to the function.\n * If false, the function cannot be called as a constructor (e.g. escape).\n * Defaults to undefined.\n * @return {!Interpreter.MyObject} New function.\n */\npublic createNativeFunction(nativeFunc: Interpreter.NativeFunction, opt_constructor?: boolean) {\n  var func = this.createObjectProto(this.FUNCTION_PROTO);\n  func.nativeFunc = nativeFunc;\n  nativeFunc.id = this.functionCounter_++;\n  this.setProperty(func, 'length', nativeFunc.length,\n      Interpreter.READONLY_DESCRIPTOR);\n  if (opt_constructor) {\n    this.setProperty(func.properties['prototype'], 'constructor',\n        func, Interpreter.NONENUMERABLE_DESCRIPTOR);\n  } else if (opt_constructor === false) {\n    func.illegalConstructor = true;\n    this.setProperty(func, 'prototype', undefined);\n  }\n  return func;\n};\n\n/**\n * Create a new native asynchronous function.\n * @param {!Function} asyncFunc JavaScript function.\n * @return {!Interpreter.MyObject} New function.\n */\npublic createAsyncFunction(asyncFunc) {\n  var func = this.createObjectProto(this.FUNCTION_PROTO);\n  func.asyncFunc = asyncFunc;\n  asyncFunc.id = this.functionCounter_++;\n  this.setProperty(func, 'length', asyncFunc.length,\n      Interpreter.READONLY_DESCRIPTOR);\n  return func;\n};\n\n/**\n * Converts from a native JS object or value to a JS interpreter object.\n * Can handle JSON-style values.\n * @param {*} nativeObj The native JS object to be converted.\n * @return {Interpreter.MyValue} The equivalent JS interpreter object.\n */\npublic nativeToPseudo(nativeObj: any): Interpreter.MyValue {\n  if (typeof nativeObj === 'boolean' ||\n      typeof nativeObj === 'number' ||\n      typeof nativeObj === 'string' ||\n      nativeObj === null || nativeObj === undefined) {\n    return nativeObj;\n  }\n\n  if (nativeObj instanceof RegExp) {\n    var pseudoRegexp = this.createObjectProto(this.REGEXP_PROTO);\n    this.populateRegExp(pseudoRegexp, nativeObj);\n    return pseudoRegexp;\n  }\n\n  if (nativeObj instanceof Function) {\n    var interpreter = this;\n    var wrapper = function() {\n      return interpreter.nativeToPseudo(\n        nativeObj.apply(interpreter,\n          Array.prototype.slice.call(arguments)\n          .map(function(i) {\n            return interpreter.pseudoToNative(i);\n          })\n        )\n      );\n    };\n    return this.createNativeFunction(wrapper, undefined);\n  }\n\n  var pseudoObj: Interpreter.MyObject;\n  if (Array.isArray(nativeObj)) {  // Array.\n    pseudoObj = this.createObjectProto(this.ARRAY_PROTO);\n    for (var i = 0; i < nativeObj.length; i++) {\n      if (i in nativeObj) {\n        this.setProperty(pseudoObj, i, this.nativeToPseudo(nativeObj[i]));\n      }\n    }\n  } else {  // Object.\n    pseudoObj = this.createObjectProto(this.OBJECT_PROTO);\n    for (var key in nativeObj) {\n      this.setProperty(pseudoObj, key, this.nativeToPseudo(nativeObj[key]));\n    }\n  }\n  return pseudoObj;\n};\n\n/**\n * Converts from a JS interpreter object to native JS object.\n * Can handle JSON-style values, plus cycles.\n * @param {Interpreter.MyValue} pseudoObj The JS interpreter object to be\n * converted.\n * @param {Object=} opt_cycles Cycle detection (used in recursive calls).\n * @return {*} The equivalent native JS object or value.\n */\npublic pseudoToNative(pseudoObj: Interpreter.MyValue, opt_cycles?: Interpreter.MyValueTable) {\n  if (typeof pseudoObj === 'boolean' ||\n      typeof pseudoObj === 'number' ||\n      typeof pseudoObj === 'string' ||\n      pseudoObj === null || pseudoObj === undefined) {\n    return pseudoObj;\n  }\n\n  if (this.isa(pseudoObj, this.REGEXP)) {  // Regular expression.\n    return pseudoObj.data;\n  }\n\n  var cycles = opt_cycles || {\n    pseudo: [],\n    native: []\n  };\n  var i = cycles.pseudo.indexOf(pseudoObj);\n  if (i !== -1) {\n    return cycles.native[i];\n  }\n  cycles.pseudo.push(pseudoObj);\n  var nativeObj;\n  if (this.isa(pseudoObj, this.ARRAY)) {  // Array.\n    nativeObj = [];\n    cycles.native.push(nativeObj);\n    var length = this.getProperty(pseudoObj, 'length');\n    for (var i = 0; i < length; i++) {\n      if (this.hasProperty(pseudoObj, i)) {\n        nativeObj[i] =\n            this.pseudoToNative(this.getProperty(pseudoObj, i), cycles);\n      }\n    }\n  } else {  // Object.\n    nativeObj = {};\n    cycles.native.push(nativeObj);\n    var val;\n    for (var key in pseudoObj.properties) {\n      val = pseudoObj.properties[key];\n      nativeObj[key] = this.pseudoToNative(val, cycles);\n    }\n  }\n  cycles.pseudo.pop();\n  cycles.native.pop();\n  return nativeObj;\n};\n\n/**\n * Look up the prototype for this value.\n * @param {Interpreter.MyValue} value Data object.\n * @return {Interpreter.MyObject} Prototype object, null if none.\n */\npublic getPrototype(value: Interpreter.MyValue): Interpreter.MyObject {\n  switch (typeof value) {\n    case 'number':\n      return this.NUMBER.properties['prototype'];\n    case 'boolean':\n      return this.BOOLEAN.properties['prototype'];\n    case 'string':\n      return this.STRING.properties['prototype'];\n  }\n  if (value) {\n    return (<Interpreter.MyObject>value).proto;\n  }\n  return null;\n};\n\n/**\n * Fetch a property value from a data object.\n * @param {Interpreter.MyValue} obj Data object.\n * @param {Interpreter.MyValue} name Name of property.\n * @return {Interpreter.MyValue} Property value (may be undefined).\n */\npublic getProperty(obj: Interpreter.MyValue, name: Interpreter.MyValue): Interpreter.MyValue {\n  name = String(name);\n  if (obj === undefined || obj === null) {\n    this.throwException(this.TYPE_ERROR,\n                        \"Cannot read property '\" + name + \"' of \" + obj);\n  }\n  if (name === 'length') {\n    // Special cases for magic length property.\n    if (this.isa(obj, this.STRING)) {\n      return String(obj).length;\n    }\n  } else if (name.charCodeAt(0) < 0x40) {\n    // Might have numbers in there?\n    // Special cases for string array indexing\n    if (this.isa(obj, this.STRING)) {\n      var n = Interpreter.legalArrayIndex(name);\n      if (!isNaN(n) && n < String(obj).length) {\n        return String(obj)[n];\n      }\n    }\n  }\n  do {\n    const myObj = <Interpreter.MyObject>obj;\n    if (myObj.properties && name in myObj.properties) {\n      var getter = myObj.getter[name];\n      if (getter) {\n        // Flag this function as being a getter and thus needing immediate\n        // execution (rather than being the value of the property).\n        getter.isGetter = true;\n        return getter;\n      }\n      return myObj.properties[name];\n    }\n  } while ((obj = this.getPrototype(obj)));\n  return undefined;\n};\n\n/**\n * Does the named property exist on a data object.\n * @param {Interpreter.MyValue} obj Data object.\n * @param {Interpreter.MyValue} name Name of property.\n * @return {boolean} True if property exists.\n */\npublic hasProperty(obj: Interpreter.MyValue, name: Interpreter.MyValue) {\n  if (!obj['isObject']) {\n    throw TypeError('Primitive data type has no properties');\n  }\n  name = String(name);\n  if (name === 'length' && this.isa(obj, this.STRING)) {\n    return true;\n  }\n  if (this.isa(obj, this.STRING)) {\n    var n = Interpreter.legalArrayIndex(name);\n    if (!isNaN(n) && n < String(obj).length) {\n      return true;\n    }\n  }\n  do {\n    const myObj = <Interpreter.MyObject> obj;\n    if (myObj.properties && name in myObj.properties) {\n      return true;\n    }\n  } while ((obj = this.getPrototype(obj)));\n  return false;\n};\n\n/**\n * Set a property value on a data object.\n * @param {!Interpreter.MyObject} obj Data object.\n * @param {Interpreter.MyValue} name Name of property.\n * @param {Interpreter.MyValue|ReferenceError} value New property value.\n *   Use ReferenceError if value is handled by descriptor instead.\n * @param {Object=} opt_descriptor Optional descriptor object.\n * @return {!Interpreter.MyObject|undefined} Returns a setter function if one\n *     needs to be called, otherwise undefined.\n */\npublic setProperty(obj: Interpreter.MyObject, name: Interpreter.MyValue, value: Interpreter.MyValue | ReferenceErrorConstructor, opt_descriptor?): Interpreter.MyObject {\n  name = String(name);\n  if (obj === undefined || obj === null) {\n    this.throwException(this.TYPE_ERROR,\n                        \"Cannot set property '\" + name + \"' of \" + obj);\n  }\n  if (opt_descriptor && ('get' in opt_descriptor || 'set' in opt_descriptor) &&\n      ('value' in opt_descriptor || 'writable' in opt_descriptor)) {\n    this.throwException(this.TYPE_ERROR, 'Invalid property descriptor. ' +\n        'Cannot both specify accessors and a value or writable attribute');\n  }\n  var strict = !this.stateStack || this.getScope().strict;\n  if (!obj.isObject) {\n    if (strict) {\n      this.throwException(this.TYPE_ERROR, \"Can't create property '\" + name +\n                          \"' on '\" + obj + \"'\");\n    }\n    return;\n  }\n  if (this.isa(obj, this.STRING)) {\n    var n = Interpreter.legalArrayIndex(name);\n    if (name === 'length' || (!isNaN(n) && n < String(obj).length)) {\n      // Can't set length or letters on String objects.\n      if (strict) {\n        this.throwException(this.TYPE_ERROR, \"Cannot assign to read only \" +\n            \"property '\" + name + \"' of String '\" + obj.data + \"'\");\n      }\n      return;\n    }\n  }\n  if (obj.class === 'Array') {\n    // Arrays have a magic length variable that is bound to the elements.\n    var length = obj.properties.length;\n    var i;\n    if (name === 'length') {\n      // Delete elements if length is smaller.\n      value = Interpreter.legalArrayLength(<number>value);\n      if (isNaN(value)) {\n        this.throwException(this.RANGE_ERROR, 'Invalid array length');\n      }\n      if (value < length) {\n        for (i in obj.properties) {\n          i = Interpreter.legalArrayIndex(i);\n          if (!isNaN(i) && value <= i) {\n            delete obj.properties[i];\n          }\n        }\n      }\n    } else if (!isNaN(i = Interpreter.legalArrayIndex(name))) {\n      // Increase length if this index is larger.\n      obj.properties.length = Math.max(length, i + 1);\n    }\n  }\n  if (obj.preventExtensions && !(name in obj.properties)) {\n    if (strict) {\n      this.throwException(this.TYPE_ERROR, \"Can't add property '\" + name +\n                          \"', object is not extensible\");\n    }\n    return;\n  }\n  if (opt_descriptor) {\n    // Define the property.\n    if ('get' in opt_descriptor) {\n      if (opt_descriptor.get) {\n        obj.getter[name] = opt_descriptor.get;\n      } else {\n        delete obj.getter[name];\n      }\n    }\n    if ('set' in opt_descriptor) {\n      if (opt_descriptor.set) {\n        obj.setter[name] = opt_descriptor.set;\n      } else {\n        delete obj.setter[name];\n      }\n    }\n    var descriptor: Interpreter.MyDescriptor = {};\n    if ('configurable' in opt_descriptor) {\n      descriptor.configurable = opt_descriptor.configurable;\n    }\n    if ('enumerable' in opt_descriptor) {\n      descriptor.enumerable = opt_descriptor.enumerable;\n    }\n    if ('writable' in opt_descriptor) {\n      descriptor.writable = opt_descriptor.writable;\n      delete obj.getter[name];\n      delete obj.setter[name];\n    }\n    if ('value' in opt_descriptor) {\n      descriptor.value = opt_descriptor.value;\n      delete obj.getter[name];\n      delete obj.setter[name];\n    } else if (value !== ReferenceError) {\n      descriptor.value = value;\n      delete obj.getter[name];\n      delete obj.setter[name];\n    }\n    try {\n      Object.defineProperty(obj.properties, name, <any>descriptor);\n    } catch (e) {\n      this.throwException(this.TYPE_ERROR, 'Cannot redefine property: ' + name);\n    }\n  } else {\n    // Set the property.\n    if (value === ReferenceError) {\n      throw ReferenceError('Value not specified.');\n    }\n    // Determine the parent (possibly self) where the property is defined.\n    var defObj = obj;\n    while (!(name in defObj.properties)) {\n      defObj = this.getPrototype(defObj);\n      if (!defObj) {\n        // This is a new property.\n        defObj = obj;\n        break;\n      }\n    }\n    if (defObj.setter && defObj.setter[name]) {\n      return defObj.setter[name];\n    }\n    if (defObj.getter && defObj.getter[name]) {\n      if (strict) {\n        this.throwException(this.TYPE_ERROR, \"Cannot set property '\" + name +\n            \"' of object '\" + obj + \"' which only has a getter\");\n      }\n    } else {\n      // No setter, simple assignment.\n      try {\n        obj.properties[name] = value;\n      } catch (e) {\n        if (strict) {\n          this.throwException(this.TYPE_ERROR, \"Cannot assign to read only \" +\n              \"property '\" + name + \"' of object '\" + obj + \"'\");\n        }\n      }\n    }\n  }\n};\n\n/**\n * Convenience method for adding a native function as a non-enumerable property\n * onto an object's prototype.\n * @param {!Interpreter.MyObject} obj Data object.\n * @param {Interpreter.MyValue} name Name of property.\n * @param {!Function} wrapper Function object.\n */\nprivate setNativeFunctionPrototype(obj: Interpreter.MyObject, name: Interpreter.MyValue, wrapper: Function) {\n  this.setProperty(obj.properties['prototype'], name,\n      this.createNativeFunction(wrapper, false),\n      Interpreter.NONENUMERABLE_DESCRIPTOR);\n};\n\n/**\n * Returns the current scope from the stateStack.\n * @return {!Interpreter.MyObject} Current scope dictionary.\n */\npublic getScope() {\n  var scope = this.stateStack[this.stateStack.length - 1].scope;\n  if (!scope) {\n    throw Error('No scope found.');\n  }\n  return scope;\n};\n\n/**\n * Create a new scope dictionary.\n * @param {!Object} node AST node defining the scope container\n *     (e.g. a function).\n * @param {Interpreter.MyObject} parentScope Scope to link to.\n * @return {!Interpreter.MyObject} New scope.\n */\npublic createScope(node: ESTree.Node, parentScope: Interpreter.MyObject) {\n  var scope = this.createObjectProto(null);\n  scope.parentScope = parentScope;\n  if (!parentScope) {\n    this.initGlobalScope(scope);\n  }\n  this.populateScope_(node, scope);\n\n  // Determine if this scope starts with 'use strict'.\n  scope.strict = false;\n  if (parentScope && parentScope.strict) {\n    scope.strict = true;\n  } else {\n    var firstNode = node['body'] && node['body'][0];\n    if (firstNode && firstNode.expression &&\n        firstNode.expression['type'] === 'Literal' &&\n        firstNode.expression.value === 'use strict') {\n      scope.strict = true;\n    }\n  }\n  return scope;\n};\n\n/**\n * Create a new special scope dictionary. Similar to createScope(), but\n * doesn't assume that the scope is for a function body.\n * This is used for 'catch' clauses and 'with' statements.\n * @param {!Interpreter.MyObject} parentScope Scope to link to.\n * @param {Interpreter.MyObject=} opt_scope Optional object to transform into\n *     scope.\n * @return {!Interpreter.MyObject} New scope.\n */\npublic createSpecialScope(parentScope: Interpreter.MyObject, opt_scope?: Interpreter.MyObject) {\n  if (!parentScope) {\n    throw Error('parentScope required');\n  }\n  var scope = opt_scope || this.createObjectProto(null);\n  scope.parentScope = parentScope;\n  scope.strict = parentScope.strict;\n  return scope;\n};\n\n/**\n * Retrieves a value from the scope chain.\n * @param {string} name Name of variable.\n * @return {Interpreter.MyValue} Any value.\n *   May be flagged as being a getter and thus needing immediate execution\n *   (rather than being the value of the property).\n */\npublic getValueFromScope(name: string): Interpreter.MyValue {\n  var scope = this.getScope();\n  while (scope && scope !== this.global) {\n    if (name in scope.properties) {\n      return scope.properties[name];\n    }\n    scope = scope.parentScope;\n  }\n  // The root scope is also an object which has inherited properties and\n  // could also have getters.\n  if (scope === this.global && this.hasProperty(scope, name)) {\n    return this.getProperty(scope, name);\n  }\n  // Typeof operator is unique: it can safely look at non-defined variables.\n  var prevNode = this.stateStack[this.stateStack.length - 1].node;\n  if (prevNode['type'] === 'UnaryExpression' &&\n      prevNode['operator'] === 'typeof') {\n    return undefined;\n  }\n  this.throwException(this.REFERENCE_ERROR, name + ' is not defined');\n};\n\n/**\n * Sets a value to the current scope.\n * @param {string} name Name of variable.\n * @param {Interpreter.MyValue} value Value.\n * @return {!Interpreter.MyObject|undefined} Returns a setter function if one\n *     needs to be called, otherwise undefined.\n */\npublic setValueToScope(name: string, value: Interpreter.MyValue) {\n  var scope = this.getScope();\n  var strict = scope.strict;\n  while (scope && scope !== this.global) {\n    if (name in scope.properties) {\n      scope.properties[name] = value;\n      return undefined;\n    }\n    scope = scope.parentScope;\n  }\n  // The root scope is also an object which has readonly properties and\n  // could also have setters.\n  if (scope === this.global && (!strict || this.hasProperty(scope, name))) {\n    return this.setProperty(scope, name, value);\n  }\n  this.throwException(this.REFERENCE_ERROR, name + ' is not defined');\n};\n\n/**\n * Create a new scope for the given node.\n * @param {!Object} node AST node (program or function).\n * @param {!Interpreter.MyObject} scope Scope dictionary to populate.\n * @private\n */\npublic populateScope_(node: ESTree.Node, scope: Interpreter.MyObject) {\n  if (node['type'] === 'VariableDeclaration') {\n    for (var i = 0; i < node['declarations'].length; i++) {\n      this.setProperty(scope, node['declarations'][i]['id']['name'],\n          undefined, Interpreter.VARIABLE_DESCRIPTOR);\n    }\n  } else if (node['type'] === 'FunctionDeclaration') {\n    this.setProperty(scope, node['id']['name'],\n        this.createFunction(<ESTree.FunctionDeclaration>node, scope), Interpreter.VARIABLE_DESCRIPTOR);\n    return;  // Do not recurse into function.\n  } else if (node['type'] === 'FunctionExpression') {\n    return;  // Do not recurse into function.\n  } else if (node['type'] === 'ExpressionStatement') {\n    return;  // Expressions can't contain variable/function declarations.\n  }\n  var nodeClass = node['constructor'];\n  for (var name in node) {\n    var prop = node[name];\n    if (prop && typeof prop === 'object') {\n      if (Array.isArray(prop)) {\n        for (var i = 0; i < prop.length; i++) {\n          if (prop[i] && prop[i].constructor === nodeClass) {\n            this.populateScope_(prop[i], scope);\n          }\n        }\n      } else {\n        if (prop.constructor === nodeClass) {\n          this.populateScope_(prop, scope);\n        }\n      }\n    }\n  }\n};\n\n/**\n * Remove start and end values from AST, or set start and end values to a\n * constant value.  Used to remove highlighting from polyfills and to set\n * highlighting in an eval to cover the entire eval expression.\n * @param {!Object} node AST node.\n * @param {number=} start Starting character of all nodes, or undefined.\n * @param {number=} end Ending character of all nodes, or undefined.\n * @private\n */\nprivate stripLocations_(node: ESTree.BaseNode, start: number, end: number) {\n  if (start) {\n    node['start'] = start;\n  } else {\n    delete node['start'];\n  }\n  if (end) {\n    node['end'] = end;\n  } else {\n    delete node['end'];\n  }\n  for (var name in node) {\n    if (node.hasOwnProperty(name)) {\n      var prop = node[name];\n      if (prop && typeof prop === 'object') {\n        this.stripLocations_(prop, start, end);\n      }\n    }\n  }\n};\n\n/**\n * Is the current state directly being called with as a construction with 'new'.\n * @return {boolean} True if 'new foo()', false if 'foo()'.\n */\npublic calledWithNew(): boolean {\n  return this.stateStack[this.stateStack.length - 1].isConstructor;\n};\n\n/**\n * Gets a value from the scope chain or from an object property.\n * @param {!Array} ref Name of variable or object/propname tuple.\n * @return {Interpreter.MyValue} Any value.\n *   May be flagged as being a getter and thus needing immediate execution\n *   (rather than being the value of the property).\n */\npublic getValue(ref) {\n  if (ref[0] === Interpreter.SCOPE_REFERENCE) {\n    // A null/varname variable lookup.\n    return this.getValueFromScope(ref[1]);\n  } else {\n    // An obj/prop components tuple (foo.bar).\n    return this.getProperty(ref[0], ref[1]);\n  }\n};\n\n/**\n * Sets a value to the scope chain or to an object property.\n * @param {!Array} ref Name of variable or object/propname tuple.\n * @param {Interpreter.MyValue} value Value.\n * @return {!Interpreter.MyObject|undefined} Returns a setter function if one\n *     needs to be called, otherwise undefined.\n */\npublic setValue(ref: Array<any> & { 0: Interpreter.MyObject, 1: string }, value: Interpreter.MyValue) {\n  if (ref[0] === Interpreter.SCOPE_REFERENCE) {\n    // A null/varname variable lookup.\n    return this.setValueToScope(ref[1], value);\n  } else {\n    // An obj/prop components tuple (foo.bar).\n    return this.setProperty(ref[0], ref[1], value);\n  }\n};\n\n/**\n * Throw an exception in the interpreter that can be handled by an\n * interpreter try/catch statement.  If unhandled, a real exception will\n * be thrown.  Can be called with either an error class and a message, or\n * with an actual object to be thrown.\n * @param {!Interpreter.MyObject} errorClass Type of error (if message is\n *   provided) or the value to throw (if no message).\n * @param {string=} opt_message Message being thrown.\n */\npublic throwException(errorClass: Interpreter.MyObject, opt_message?: string) {\n  if (opt_message === undefined) {\n    var error = <Interpreter.MyObject>errorClass;  // This is a value to throw, not an error class.\n  } else {\n    var error = this.createObject(errorClass);\n    this.setProperty(error, 'message', opt_message,\n        Interpreter.NONENUMERABLE_DESCRIPTOR);\n  }\n  this.executeException(error);\n  // Abort anything related to the current step.\n  throw Interpreter.STEP_ERROR;\n};\n\n/**\n * Throw an exception in the interpreter that can be handled by a\n * interpreter try/catch statement.  If unhandled, a real exception will\n * be thrown.\n * @param {!Interpreter.MyObject} error Error object to execute.\n */\npublic executeException(error: Interpreter.MyObject) {\n  // Search for a try statement.\n  const stateStack = this.stateStack.slice();\n  do {\n    this.stateStack.pop();\n    var state = this.stateStack[this.stateStack.length - 1];\n    if (state.node['type'] === 'TryStatement') {\n      state.throwValue = error;\n      return;\n    }\n  } while (state && state.node['type'] !== 'Program');\n\n  // Throw a real error.\n  var realError;\n  if (this.isa(error, this.ERROR)) {\n    var errorTable = {\n      'EvalError': EvalError,\n      'RangeError': RangeError,\n      'ReferenceError': ReferenceError,\n      'SyntaxError': SyntaxError,\n      'TypeError': TypeError,\n      'URIError': URIError\n    };\n    var name = this.getProperty(error, 'name').toString();\n    var message = this.getProperty(error, 'message').valueOf();\n    var type = errorTable[name] || Error;\n    realError = type(message);\n  } else {\n    realError = String(error);\n  }\n  this.stateStack = stateStack; // recover the original state stack\n  throw realError;\n};\n\n/**\n * Create a call to a getter function.\n * @param {!Interpreter.MyObject} func Function to execute.\n * @param {!Interpreter.MyObject|!Array} left\n *     Name of variable or object/propname tuple.\n * @private\n */\npublic createGetter_(func: Interpreter.MyObject, left: Interpreter.MyObject | Array<Interpreter.MyObject>) {\n  // Normally 'this' will be specified as the object component (o.x).\n  // Sometimes 'this' is explicitly provided (o).\n  var funcThis = Array.isArray(left) ? left[0] : left;\n  var node = new this.nodeConstructor();\n  node['type'] = 'CallExpression';\n  var state = new Interpreter.MyState(node,\n      this.stateStack[this.stateStack.length - 1].scope);\n  state.doneCallee_ = true;\n  state.funcThis_ = funcThis;\n  state.func_ = func;\n  state.doneArgs_ = true;\n  state.arguments_ = [];\n  return state;\n};\n\n/**\n * Create a call to a setter function.\n * @param {!Interpreter.MyObject} func Function to execute.\n * @param {!Interpreter.MyObject|!Array} left\n *     Name of variable or object/propname tuple.\n * @param {Interpreter.MyValue} value Value to set.\n * @private\n */\npublic createSetter_(func: Interpreter.MyObject, left: Interpreter.MyObject | Array<Interpreter.MyObject>, value: Interpreter.MyValue) {\n  // Normally 'this' will be specified as the object component (o.x).\n  // Sometimes 'this' is implicitly the global object (x).\n  var funcThis = Array.isArray(left) ? left[0] : this.global;\n  var node = new this.nodeConstructor();\n  node['type'] = 'CallExpression';\n  var state = new Interpreter.MyState(node,\n      this.stateStack[this.stateStack.length - 1].scope);\n  state.doneCallee_ = true;\n  state.funcThis_ = funcThis;\n  state.func_ = func;\n  state.doneArgs_ = true;\n  state.arguments_ = [value];\n  return state;\n};\n\n\n///////////////////////////////////////////////////////////////////////////////\n// Functions to handle each node type.\n///////////////////////////////////////////////////////////////////////////////\n\nprivate stepArrayExpression(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  var elements = node['elements'];\n  var n = state.n_ || 0;\n  if (!state.array_) {\n    state.array_ = this.createObjectProto(this.ARRAY_PROTO);\n    state.array_.properties.length = elements.length;\n  } else {\n    this.setProperty(state.array_, n, state.value);\n    n++;\n  }\n  while (n < elements.length) {\n    // Skip missing elements - they're not defined, not undefined.\n    if (elements[n]) {\n      state.n_ = n;\n      return new Interpreter.MyState(elements[n], state.scope);\n    }\n    n++;\n  }\n  stack.pop();\n  stack[stack.length - 1].value = state.array_;\n};\n\nprivate stepAssignmentExpression(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  if (!state.doneLeft_) {\n    state.doneLeft_ = true;\n    var nextState = new Interpreter.MyState(node['left'], state.scope);\n    nextState.components = true;\n    return nextState;\n  }\n  if (!state.doneRight_) {\n    if (!state.leftReference_) {\n      state.leftReference_ = state.value;\n    }\n    if (state.doneGetter_) {\n      state.leftValue_ = state.value;\n    }\n    if (!state.doneGetter_ && node['operator'] !== '=') {\n      var leftValue = this.getValue(state.leftReference_);\n      state.leftValue_ = leftValue;\n      if (leftValue && typeof leftValue === 'object' && leftValue.isGetter) {\n        // Clear the getter flag and call the getter function.\n        leftValue.isGetter = false;\n        state.doneGetter_ = true;\n        var func = /** @type {!Interpreter.Object} */ (leftValue);\n        return this.createGetter_(func, state.leftReference_);\n      }\n    }\n    state.doneRight_ = true;\n    return new Interpreter.MyState(node['right'], state.scope);\n  }\n  if (state.doneSetter_) {\n    // Return if setter function.\n    // Setter method on property has completed.\n    // Ignore its return value, and use the original set value instead.\n    stack.pop();\n    stack[stack.length - 1].value = state.doneSetter_;\n    return;\n  }\n  var value = state.leftValue_;\n  var rightValue = state.value;\n  switch (node['operator']) {\n    case '=':    value =    rightValue; break;\n    case '+=':   value +=   rightValue; break;\n    case '-=':   value -=   rightValue; break;\n    case '*=':   value *=   rightValue; break;\n    case '/=':   value /=   rightValue; break;\n    case '%=':   value %=   rightValue; break;\n    case '<<=':  value <<=  rightValue; break;\n    case '>>=':  value >>=  rightValue; break;\n    case '>>>=': value >>>= rightValue; break;\n    case '&=':   value &=   rightValue; break;\n    case '^=':   value ^=   rightValue; break;\n    case '|=':   value |=   rightValue; break;\n    default:\n      throw SyntaxError('Unknown assignment expression: ' + node['operator']);\n  }\n  var setter = this.setValue(state.leftReference_, value);\n  if (setter) {\n    state.doneSetter_ = value;\n    return this.createSetter_(setter, state.leftReference_, value);\n  }\n  // Return if no setter function.\n  stack.pop();\n  stack[stack.length - 1].value = value;\n};\n\nprivate stepBinaryExpression(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  if (!state.doneLeft_) {\n    state.doneLeft_ = true;\n    return new Interpreter.MyState(node['left'], state.scope);\n  }\n  if (!state.doneRight_) {\n    state.doneRight_ = true;\n    state.leftValue_ = state.value;\n    return new Interpreter.MyState(node['right'], state.scope);\n  }\n  stack.pop();\n  var leftValue = state.leftValue_;\n  var rightValue = state.value;\n  var value;\n  switch (node['operator']) {\n    case '==':  value = leftValue ==  rightValue; break;\n    case '!=':  value = leftValue !=  rightValue; break;\n    case '===': value = leftValue === rightValue; break;\n    case '!==': value = leftValue !== rightValue; break;\n    case '>':   value = leftValue >   rightValue; break;\n    case '>=':  value = leftValue >=  rightValue; break;\n    case '<':   value = leftValue <   rightValue; break;\n    case '<=':  value = leftValue <=  rightValue; break;\n    case '+':   value = leftValue +   rightValue; break;\n    case '-':   value = leftValue -   rightValue; break;\n    case '*':   value = leftValue *   rightValue; break;\n    case '/':   value = leftValue /   rightValue; break;\n    case '%':   value = leftValue %   rightValue; break;\n    case '&':   value = leftValue &   rightValue; break;\n    case '|':   value = leftValue |   rightValue; break;\n    case '^':   value = leftValue ^   rightValue; break;\n    case '<<':  value = leftValue <<  rightValue; break;\n    case '>>':  value = leftValue >>  rightValue; break;\n    case '>>>': value = leftValue >>> rightValue; break;\n    case 'in':\n      if (!rightValue || !rightValue.isObject) {\n        this.throwException(this.TYPE_ERROR,\n            \"'in' expects an object, not '\" + rightValue + \"'\");\n      }\n      value = this.hasProperty(rightValue, leftValue);\n      break;\n    case 'instanceof':\n      if (!this.isa(rightValue, this.FUNCTION)) {\n        this.throwException(this.TYPE_ERROR,\n            'Right-hand side of instanceof is not an object');\n      }\n      value = leftValue.isObject ? this.isa(leftValue, rightValue) : false;\n      break;\n    default:\n      throw SyntaxError('Unknown binary operator: ' + node['operator']);\n  }\n  stack[stack.length - 1].value = value;\n};\n\nprivate stepBlockStatement(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  var n = state.n_ || 0;\n  var expression = node['body'][n];\n  if (expression) {\n    state.n_ = n + 1;\n    return new Interpreter.MyState(expression, state.scope);\n  }\n  stack.pop();\n};\n\nprivate stepBreakStatement(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  stack.pop();\n  var label = null;\n  if (node['label']) {\n    label = node['label']['name'];\n  }\n  while (state &&\n         state.node['type'] !== 'CallExpression' &&\n         state.node['type'] !== 'NewExpression') {\n    if (label) {\n      if (state.labels && state.labels.indexOf(label) !== -1) {\n        return;\n      }\n    } else if (state.isLoop || state.isSwitch) {\n      return;\n    }\n    state = stack.pop();\n  }\n  // Syntax error, do not allow this error to be trapped.\n  throw SyntaxError('Illegal break statement');\n};\n\nprivate stepCallExpression(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  if (!state.doneCallee_) {\n    state.doneCallee_ = 1;\n    // Components needed to determine value of 'this'.\n    var nextState = new Interpreter.MyState(node['callee'], state.scope);\n    nextState.components = true;\n    return nextState;\n  }\n  if (state.doneCallee_ === 1) {\n    // Determine value of the function.\n    state.doneCallee_ = 2;\n    var func = state.value;\n    if (Array.isArray(func)) {\n      state.func_ = this.getValue(func);\n      if (func[0] !== Interpreter.SCOPE_REFERENCE) {\n        // Method function, 'this' is object (ignored if invoked as 'new').\n        state.funcThis_ = func[0];\n      }\n      func = state.func_;\n      if (func && typeof func === 'object' && func.isGetter) {\n        // Clear the getter flag and call the getter function.\n        func.isGetter = false;\n        state.doneCallee_ = 1;\n        return this.createGetter_(/** @type {!Interpreter.Object} */ (func),\n                         state.value);\n      }\n    } else {\n      // Already evaluated function: (function(){...})();\n      state.func_ = func;\n    }\n    state.arguments_ = [];\n    state.n_ = 0;\n  }\n  var func = state.func_;\n  if (!state.doneArgs_) {\n    if (state.n_ !== 0) {\n      state.arguments_.push(state.value);\n    }\n    if (node['arguments'][state.n_]) {\n      return new Interpreter.MyState(node['arguments'][state.n_++], state.scope);\n    }\n    // Determine value of 'this' in function.\n    if (node['type'] === 'NewExpression') {\n      if (func.illegalConstructor) {\n        // Illegal: new escape();\n        this.throwException(this.TYPE_ERROR, func + ' is not a constructor');\n      }\n      // Constructor, 'this' is new object.\n      state.funcThis_ = this.createObject(func);\n      state.isConstructor = true;\n    } else if (state.funcThis_ === undefined) {\n      // Global function, 'this' is global object (or 'undefined' if strict).\n      state.funcThis_ = state.scope.strict ? undefined : this.global;\n    }\n    state.doneArgs_ = true;\n  }\n  if (!state.doneExec_) {\n    state.doneExec_ = true;\n    if (!func || !func.isObject) {\n      this.throwException(this.TYPE_ERROR, func + ' is not a function');\n    }\n    var funcNode = func.node;\n    if (funcNode) {\n      var scope = this.createScope(funcNode['body'], func.parentScope);\n      // Add all arguments.\n      for (var i = 0; i < funcNode['params'].length; i++) {\n        var paramName = funcNode['params'][i]['name'];\n        var paramValue = state.arguments_.length > i ? state.arguments_[i] :\n            undefined;\n        this.setProperty(scope, paramName, paramValue);\n      }\n      // Build arguments variable.\n      var argsList = this.createObjectProto(this.ARRAY_PROTO);\n      for (var i = 0; i < state.arguments_.length; i++) {\n        this.setProperty(argsList, i, state.arguments_[i]);\n      }\n      this.setProperty(scope, 'arguments', argsList);\n      // Add the function's name (var x = function foo(){};)\n      var name = funcNode['id'] && funcNode['id']['name'];\n      if (name) {\n        this.setProperty(scope, name, func);\n      }\n      this.setProperty(scope, 'this', state.funcThis_,\n                       Interpreter.READONLY_DESCRIPTOR);\n      state.value = undefined;  // Default value if no explicit return.\n      return new Interpreter.MyState(funcNode['body'], scope);\n    } else if (func.eval) {\n      var code = state.arguments_[0];\n      if (typeof code !== 'string') {\n        // JS does not parse String objects:\n        // eval(new String('1 + 1')) -> '1 + 1'\n        state.value = code;\n      } else {\n        try {\n          var ast = Interpreter.acorn.parse(code.toString(), Interpreter.PARSE_OPTIONS);\n        } catch (e) {\n          // Acorn threw a SyntaxError.  Rethrow as a trappable error.\n          this.throwException(this.SYNTAX_ERROR, 'Invalid code: ' + e.message);\n        }\n        var evalNode = new this.nodeConstructor();\n        evalNode['type'] = 'EvalProgram_';\n        evalNode['body'] = ast['body'];\n        this.stripLocations_(evalNode, node['start'], node['end']);\n        // Update current scope with definitions in eval().\n        var scope = <Interpreter.MyObject>state.scope;\n        if (scope.strict) {\n          // Strict mode get its own scope in eval.\n          scope = this.createScope(ast, scope);\n        } else {\n          // Non-strict mode pollutes the current scope.\n          this.populateScope_(ast, scope);\n        }\n        this.value = undefined;  // Default value if no code.\n        return new Interpreter.MyState(evalNode, scope);\n      }\n    } else if (func.nativeFunc) {\n      state.value = func.nativeFunc.apply(state.funcThis_, state.arguments_);\n    } else if (func.asyncFunc) {\n      var thisInterpreter = this;\n      var callback = function(value) {\n        state.value = value;\n        thisInterpreter.paused_ = false;\n      };\n      var argsWithCallback = state.arguments_.concat(callback);\n      this.paused_ = true;\n      func.asyncFunc.apply(state.funcThis_, argsWithCallback);\n      return;\n    } else {\n      /* A child of a function is a function but is not callable.  For example:\n      var F = function() {};\n      F.prototype = escape;\n      var f = new F();\n      f();\n      */\n      this.throwException(this.TYPE_ERROR, func.class + ' is not a function');\n    }\n  } else {\n    // Execution complete.  Put the return value on the stack.\n    stack.pop();\n    if (state.isConstructor && typeof state.value !== 'object') {\n      stack[stack.length - 1].value = state.funcThis_;\n    } else {\n      stack[stack.length - 1].value = state.value;\n    }\n  }\n};\n\nprivate stepCatchClause(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  if (!state.done_) {\n    state.done_ = true;\n    // Create an empty scope.\n    var scope = this.createSpecialScope(state.scope);\n    // Add the argument.\n    this.setProperty(scope, node['param']['name'], state.throwValue);\n    // Execute catch clause.\n    return new Interpreter.MyState(node['body'], scope);\n  } else {\n    stack.pop();\n  }\n};\n\nprivate stepConditionalExpression(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  var mode = state.mode_ || 0;\n  if (mode === 0) {\n    state.mode_ = 1;\n    return new Interpreter.MyState(node['test'], state.scope);\n  }\n  if (mode === 1) {\n    state.mode_ = 2;\n    var value = Boolean(state.value);\n    if (value && node['consequent']) {\n      // Execute 'if' block.\n      return new Interpreter.MyState(node['consequent'], state.scope);\n    } else if (!value && node['alternate']) {\n      // Execute 'else' block.\n      return new Interpreter.MyState(node['alternate'], state.scope);\n    }\n    // eval('1;if(false){2}') -> undefined\n    this.value = undefined;\n  }\n  stack.pop();\n  if (node['type'] === 'ConditionalExpression') {\n    stack[stack.length - 1].value = state.value;\n  }\n};\n\nprivate stepContinueStatement(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  stack.pop();\n  var label = null;\n  if (node['label']) {\n    label = node['label']['name'];\n  }\n  state = stack[stack.length - 1];\n  while (state &&\n         state.node['type'] !== 'CallExpression' &&\n         state.node['type'] !== 'NewExpression') {\n    if (state.isLoop) {\n      if (!label || (state.labels && state.labels.indexOf(label) !== -1)) {\n        return;\n      }\n    }\n    stack.pop();\n    state = stack[stack.length - 1];\n  }\n  // Syntax error, do not allow this error to be trapped.\n  throw SyntaxError('Illegal continue statement');\n};\n\nprivate stepDebuggerStatement(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  // Do nothing.  May be overridden by developers.\n  stack.pop();\n};\n\nprivate stepDoWhileStatement(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  if (node['type'] === 'DoWhileStatement' && state.test_ === undefined) {\n    // First iteration of do/while executes without checking test.\n    state.value = true;\n    state.test_ = true;\n  }\n  if (!state.test_) {\n    state.test_ = true;\n    return new Interpreter.MyState(node['test'], state.scope);\n  }\n  if (!state.value) {  // Done, exit loop.\n    stack.pop();\n  } else if (node['body']) {  // Execute the body.\n    state.test_ = false;\n    state.isLoop = true;\n    return new Interpreter.MyState(node['body'], state.scope);\n  }\n};\n\nprivate stepEmptyStatement(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  stack.pop();\n};\n\nprivate stepEvalProgram_(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  var n = state.n_ || 0;\n  var expression = node['body'][n];\n  if (expression) {\n    state.n_ = n + 1;\n    return new Interpreter.MyState(expression, state.scope);\n  }\n  stack.pop();\n  stack[stack.length - 1].value = this.value;\n};\n\nprivate stepExpressionStatement(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  if (!state.done_) {\n    state.done_ = true;\n    return new Interpreter.MyState(node['expression'], state.scope);\n  }\n  stack.pop();\n  // Save this value to interpreter.value for use as a return value if\n  // this code is inside an eval function.\n  this.value = state.value;\n};\n\nprivate stepForInStatement(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  // First, initialize a variable if exists.  Only do so once, ever.\n  if (!state.doneInit_) {\n    state.doneInit_ = true;\n    if (node['left']['declarations'] &&\n        node['left']['declarations'][0]['init']) {\n      if (state.scope.strict) {\n        this.throwException(this.SYNTAX_ERROR,\n            'for-in loop variable declaration may not have an initializer.');\n      }\n      // Variable initialization: for (var x = 4 in y)\n      return new Interpreter.MyState(node['left'], state.scope);\n    }\n  }\n  // Second, look up the object.  Only do so once, ever.\n  if (!state.doneObject_) {\n    state.doneObject_ = true;\n    if (!state.variable_) {\n      state.variable_ = state.value;\n    }\n    return new Interpreter.MyState(node['right'], state.scope);\n  }\n  if (!state.isLoop) {\n    // First iteration.\n    state.isLoop = true;\n    state.object_ = state.value;\n    state.visited_ = Object.create(null);\n  }\n  // Third, find the property name for this iteration.\n  if (state.name_ === undefined) {\n    done: do {\n      if (state.object_ && state.object_.isObject) {\n        if (!state.props_) {\n          state.props_ = Object.getOwnPropertyNames(state.object_.properties);\n        }\n        do {\n          var prop = state.props_.shift();\n        } while (prop && (state.visited_[prop] ||\n            !Object.prototype.hasOwnProperty.call(state.object_.properties,\n                                                  prop)));\n        if (prop) {\n          state.visited_[prop] = true;\n          if (Object.prototype.propertyIsEnumerable.call(\n              state.object_.properties, prop)) {\n            state.name_ = prop;\n            break done;\n          }\n        }\n      } else if (state.object_ !== null) {\n        if (!state.props_) {\n          state.props_ = Object.getOwnPropertyNames(state.object_);\n        }\n        do {\n          var prop = state.props_.shift();\n        } while (prop && state.visited_[prop]);\n        if (prop) {\n          state.visited_[prop] = true;\n          state.name_ = prop;\n          break done;\n        }\n      }\n      state.object_ = this.getPrototype(state.object_);\n      state.props_ = null;\n    } while (state.object_ !== null);\n    if (state.object_ === null) {\n      // Done, exit loop.\n      stack.pop();\n      return;\n    }\n  }\n  // Fourth, find the variable\n  if (!state.doneVariable_) {\n    state.doneVariable_ = true;\n    var left = node['left'];\n    if (left['type'] === 'VariableDeclaration') {\n      // Inline variable declaration: for (var x in y)\n      state.variable_ =\n          [Interpreter.SCOPE_REFERENCE, left['declarations'][0]['id']['name']];\n    } else {\n      // Arbitrary left side: for (foo().bar in y)\n      state.variable_ = null;\n      var nextState = new Interpreter.MyState(left, state.scope);\n      nextState.components = true;\n      return nextState;\n    }\n  }\n  if (!state.variable_) {\n    state.variable_ = state.value;\n  }\n  // Fifth, set the variable.\n  if (!state.doneSetter_) {\n    state.doneSetter_ = true;\n    var value = state.name_;\n    var setter = this.setValue(state.variable_, value);\n    if (setter) {\n      return this.createSetter_(setter, state.variable_, value);\n    }\n  }\n  // Next step will be step three.\n  state.name_ = undefined;\n  // Reevaluate the variable since it could be a setter on the global object.\n  state.doneVariable_ = false;\n  state.doneSetter_ = false;\n  // Sixth and finally, execute the body if there was one.  this.\n  if (node['body']) {\n    return new Interpreter.MyState(node['body'], state.scope);\n  }\n};\n\nprivate stepForStatement(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  var mode = state.mode_ || 0;\n  if (mode === 0) {\n    state.mode_ = 1;\n    if (node['init']) {\n      return new Interpreter.MyState(node['init'], state.scope);\n    }\n  } else if (mode === 1) {\n    state.mode_ = 2;\n    if (node['test']) {\n      return new Interpreter.MyState(node['test'], state.scope);\n    }\n  } else if (mode === 2) {\n    state.mode_ = 3;\n    if (node['test'] && !state.value) {\n      // Done, exit loop.\n      stack.pop();\n    } else {  // Execute the body.\n      state.isLoop = true;\n      return new Interpreter.MyState(node['body'], state.scope);\n    }\n  } else if (mode === 3) {\n    state.mode_ = 1;\n    if (node['update']) {\n      return new Interpreter.MyState(node['update'], state.scope);\n    }\n  }\n};\n\nprivate stepFunctionDeclaration(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  // This was found and handled when the scope was populated.\n  stack.pop();\n};\n\nprivate stepFunctionExpression(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  stack.pop();\n  stack[stack.length - 1].value = this.createFunction(<ESTree.FunctionDeclaration>node, state.scope);\n};\n\nprivate stepIdentifier(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  stack.pop();\n  if (state.components) {\n    stack[stack.length - 1].value = [Interpreter.SCOPE_REFERENCE, node['name']];\n    return;\n  }\n  var value = this.getValueFromScope(node['name']);\n  // An identifier could be a getter if it's a property on the global object.\n  if (value && typeof value === 'object' && value.isGetter) {\n    // Clear the getter flag and call the getter function.\n    value.isGetter = false;\n    var scope = state.scope;\n    while (!this.hasProperty(scope, node['name'])) {\n      scope = scope.parentScope;\n    }\n    var func = /** @type {!Interpreter.Object} */ (value);\n    return this.createGetter_(func, this.global);\n  }\n  stack[stack.length - 1].value = value;\n};\n\nprivate stepIfStatement(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  return this.stepConditionalExpression(stack, state, node);\n}\n\nprivate stepLabeledStatement(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  // No need to hit this node again on the way back up the stack.\n  stack.pop();\n  // Note that a statement might have multiple labels.\n  var labels = state.labels || [];\n  labels.push(node['label']['name']);\n  var nextState = new Interpreter.MyState(node['body'], state.scope);\n  nextState.labels = labels;\n  return nextState;\n};\n\nprivate stepLiteral(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  stack.pop();\n  var value = node['value'];\n  if (value instanceof RegExp) {\n    var pseudoRegexp = this.createObjectProto(this.REGEXP_PROTO);\n    this.populateRegExp(pseudoRegexp, value);\n    value = pseudoRegexp;\n  }\n  stack[stack.length - 1].value = value;\n};\n\nprivate stepLogicalExpression(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  if (node['operator'] !== '&&' && node['operator'] !== '||') {\n    throw SyntaxError('Unknown logical operator: ' + node['operator']);\n  }\n  if (!state.doneLeft_) {\n    state.doneLeft_ = true;\n    return new Interpreter.MyState(node['left'], state.scope);\n  }\n  if (!state.doneRight_) {\n    if ((node['operator'] === '&&' && !state.value) ||\n        (node['operator'] === '||' && state.value)) {\n      // Shortcut evaluation.\n      stack.pop();\n      stack[stack.length - 1].value = state.value;\n    } else {\n      state.doneRight_ = true;\n      return new Interpreter.MyState(node['right'], state.scope);\n    }\n  } else {\n    stack.pop();\n    stack[stack.length - 1].value = state.value;\n  }\n};\n\nprivate stepMemberExpression(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  if (!state.doneObject_) {\n    state.doneObject_ = true;\n    return new Interpreter.MyState(node['object'], state.scope);\n  }\n  var propName;\n  if (!node['computed']) {\n    state.object_ = state.value;\n    // obj.foo -- Just access 'foo' directly.\n    propName = node['property']['name'];\n  } else if (!state.doneProperty_) {\n    state.object_ = state.value;\n    // obj[foo] -- Compute value of 'foo'.\n    state.doneProperty_ = true;\n    return new Interpreter.MyState(node['property'], state.scope);\n  } else {\n    propName = state.value;\n  }\n  stack.pop();\n  if (state.components) {\n    stack[stack.length - 1].value = [state.object_, propName];\n  } else {\n    var value = this.getProperty(state.object_, propName);\n    if (value && typeof value === 'object' && value.isGetter) {\n      // Clear the getter flag and call the getter function.\n      value.isGetter = false;\n      var func = /** @type {!Interpreter.Object} */ (value);\n      return this.createGetter_(func, state.object_);\n    }\n    stack[stack.length - 1].value = value;\n  }\n};\n\nprivate stepNewExpression(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  return this.stepCallExpression(stack, state, node);\n}\n\nprivate stepObjectExpression(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  var n = state.n_ || 0;\n  var property = node['properties'][n];\n  if (!state.object_) {\n    // First execution.\n    state.object_ = this.createObjectProto(this.OBJECT_PROTO);\n    state.properties_ = Object.create(null);\n  } else {\n    // Determine property name.\n    var key = <string>property['key'];\n    if (key['type'] === 'Identifier') {\n      var propName = key['name'];\n    } else if (key['type'] === 'Literal') {\n      var propName = key['value'];\n    } else {\n      throw SyntaxError('Unknown object structure: ' + key['type']);\n    }\n    // Set the property computed in the previous execution.\n    if (!state.properties_[propName]) {\n      // Create temp object to collect value, getter, and/or setter.\n      state.properties_[propName] = {};\n    }\n    state.properties_[propName][property['kind']] = state.value;\n    state.n_ = ++n;\n    property = node['properties'][n];\n  }\n  if (property) {\n    return new Interpreter.MyState(property['value'], state.scope);\n  }\n  for (var key in state.properties_) {\n    var kinds = state.properties_[key];\n    if ('get' in kinds || 'set' in kinds) {\n      // Set a property with a getter or setter.\n      var descriptor = {\n        configurable: true,\n        enumerable: true,\n        get: kinds['get'],\n        set: kinds['set']\n      };\n      this.setProperty(state.object_, key, null, descriptor);\n    } else {\n      // Set a normal property with a value.\n      this.setProperty(state.object_, key, kinds['init']);\n    }\n  }\n  stack.pop();\n  stack[stack.length - 1].value = state.object_;\n};\n\nprivate stepProgram(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  var n = state.n_ || 0;\n  var expression = node['body'][n];\n  if (expression) {\n    state.done = false;\n    state.n_ = n + 1;\n    return new Interpreter.MyState(expression, state.scope);\n  }\n  state.done = true;\n  // Don't pop the stateStack.\n  // Leave the root scope on the tree in case the program is appended to.\n};\n\nprivate stepReturnStatement(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  if (node['argument'] && !state.done_) {\n    state.done_ = true;\n    return new Interpreter.MyState(node['argument'], state.scope);\n  }\n  var value = state.value;\n  var i = stack.length - 1;\n  state = stack[i];\n  while (state.node['type'] !== 'CallExpression' &&\n         state.node['type'] !== 'NewExpression') {\n    if (state.node['type'] !== 'TryStatement') {\n      stack.splice(i, 1);\n    }\n    i--;\n    if (i < 0) {\n      // Syntax error, do not allow this error to be trapped.\n      throw SyntaxError('Illegal return statement');\n    }\n    state = stack[i];\n  }\n  state.value = value;\n};\n\nprivate stepSequenceExpression(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  var n = state.n_ || 0;\n  var expression = node['expressions'][n];\n  if (expression) {\n    state.n_ = n + 1;\n    return new Interpreter.MyState(expression, state.scope);\n  }\n  stack.pop();\n  stack[stack.length - 1].value = state.value;\n};\n\nprivate stepSwitchStatement(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  if (!state.test_) {\n    state.test_ = 1;\n    return new Interpreter.MyState(node['discriminant'], state.scope);\n  }\n  if (state.test_ === 1) {\n    state.test_ = 2;\n    // Preserve switch value between case tests.\n    state.switchValue_ = state.value;\n  }\n\n  while (true) {\n    var index = state.index_ || 0;\n    var switchCase = node['cases'][index];\n    if (!state.matched_ && switchCase && !switchCase['test']) {\n      // Test on the default case is null.\n      // Bypass (but store) the default case, and get back to it later.\n      state.defaultCase_ = index;\n      state.index_ = index + 1;\n      continue;\n    }\n    if (!switchCase && !state.matched_ && state.defaultCase_) {\n      // Ran through all cases, no match.  Jump to the default.\n      state.matched_ = true;\n      state.index_ = state.defaultCase_;\n      continue;\n    }\n    if (switchCase) {\n      if (!state.matched_ && !state.tested_ && switchCase['test']) {\n        state.tested_ = true;\n        return new Interpreter.MyState(switchCase['test'], state.scope);\n      }\n      if (state.matched_ || state.value === state.switchValue_) {\n        state.matched_ = true;\n        var n = state.n_ || 0;\n        if (switchCase['consequent'][n]) {\n          state.isSwitch = true;\n          state.n_ = n + 1;\n          return new Interpreter.MyState(switchCase['consequent'][n],\n                                       state.scope);\n        }\n      }\n      // Move on to next case.\n      state.tested_ = false;\n      state.n_ = 0;\n      state.index_ = index + 1;\n    } else {\n      stack.pop();\n      return;\n    }\n  }\n};\n\nprivate stepThisExpression(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  stack.pop();\n  stack[stack.length - 1].value = this.getValueFromScope('this');\n};\n\nprivate stepThrowStatement(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  if (!state.done_) {\n    state.done_ = true;\n    return new Interpreter.MyState(node['argument'], state.scope);\n  } else {\n    this.throwException(state.value);\n  }\n};\n\nprivate stepTryStatement(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  if (!state.doneBlock_) {\n    state.doneBlock_ = true;\n    return new Interpreter.MyState(node['block'], state.scope);\n  }\n  if (state.throwValue && !state.doneHandler_ && node['handler']) {\n    state.doneHandler_ = true;\n    var nextState = new Interpreter.MyState(node['handler'], state.scope);\n    nextState.throwValue = state.throwValue;\n    state.throwValue = null;  // This error has been handled, don't rethrow.\n    return nextState;\n  }\n  if (!state.doneFinalizer_ && node['finalizer']) {\n    state.doneFinalizer_ = true;\n    return new Interpreter.MyState(node['finalizer'], state.scope);\n  }\n  if (state.throwValue) {\n    // There was no catch handler, or the catch/finally threw an error.\n    // Throw the error up to a higher try.\n    this.executeException(state.throwValue);\n  } else {\n    stack.pop();\n  }\n};\n\nprivate stepUnaryExpression(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  if (!state.done_) {\n    state.done_ = true;\n    var nextState = new Interpreter.MyState(node['argument'], state.scope);\n    nextState.components = node['operator'] === 'delete';\n    return nextState;\n  }\n  stack.pop();\n  var value = state.value;\n  if (node['operator'] === '-') {\n    value = -value;\n  } else if (node['operator'] === '+') {\n    value = +value;\n  } else if (node['operator'] === '!') {\n    value = !value;\n  } else if (node['operator'] === '~') {\n    value = ~value;\n  } else if (node['operator'] === 'delete') {\n    var result = true;\n    // If value is not an array, then it is a primitive, or some other value.\n    // If so, skip the delete and return true.\n    if (Array.isArray(value)) {\n      var obj = value[0];\n      if (obj === Interpreter.SCOPE_REFERENCE) {\n        // 'delete foo;' is the same as 'delete window.foo'.\n        obj = state.scope;\n      }\n      var name = String(value[1]);\n      try {\n        delete obj.properties[name];\n      } catch (e) {\n        if (state.scope.strict) {\n          this.throwException(this.TYPE_ERROR, \"Cannot delete property '\" +\n                              name + \"' of '\" + obj + \"'\");\n        } else {\n          result = false;\n        }\n      }\n    }\n    value = result;\n  } else if (node['operator'] === 'typeof') {\n    value = (value && value.class === 'Function') ? 'function' : typeof value;\n  } else if (node['operator'] === 'void') {\n    value = undefined;\n  } else {\n    throw SyntaxError('Unknown unary operator: ' + node['operator']);\n  }\n  stack[stack.length - 1].value = value;\n};\n\nprivate stepUpdateExpression(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  if (!state.doneLeft_) {\n    state.doneLeft_ = true;\n    var nextState = new Interpreter.MyState(node['argument'], state.scope);\n    nextState.components = true;\n    return nextState;\n  }\n  if (!state.leftSide_) {\n    state.leftSide_ = state.value;\n  }\n  if (state.doneGetter_) {\n    state.leftValue_ = state.value;\n  }\n  if (!state.doneGetter_) {\n    var leftValue = this.getValue(state.leftSide_);\n    state.leftValue_ = leftValue;\n    if (leftValue && typeof leftValue === 'object' && leftValue.isGetter) {\n      // Clear the getter flag and call the getter function.\n      leftValue.isGetter = false;\n      state.doneGetter_ = true;\n      var func = /** @type {!Interpreter.Object} */ (leftValue);\n      return this.createGetter_(func, state.leftSide_);\n    }\n  }\n  if (state.doneSetter_) {\n    // Return if setter function.\n    // Setter method on property has completed.\n    // Ignore its return value, and use the original set value instead.\n    stack.pop();\n    stack[stack.length - 1].value = state.doneSetter_;\n    return;\n  }\n  leftValue = Number(state.leftValue_);\n  var changeValue;\n  if (node['operator'] === '++') {\n    changeValue = leftValue + 1;\n  } else if (node['operator'] === '--') {\n    changeValue = leftValue - 1;\n  } else {\n    throw SyntaxError('Unknown update expression: ' + node['operator']);\n  }\n  var returnValue = node['prefix'] ? changeValue : leftValue;\n  var setter = this.setValue(state.leftSide_, changeValue);\n  if (setter) {\n    state.doneSetter_ = returnValue;\n    return this.createSetter_(setter, state.leftSide_, changeValue);\n  }\n  // Return if no setter function.\n  stack.pop();\n  stack[stack.length - 1].value = returnValue;\n};\n\nprivate stepVariableDeclaration(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  var declarations = node['declarations'];\n  var n = state.n_ || 0;\n  var declarationNode = declarations[n];\n  if (state.init_ && declarationNode) {\n    // This setValue call never needs to deal with calling a setter function.\n    // Note that this is setting the init value, not defining the variable.\n    // Variable definition is done when scope is populated.\n    this.setValueToScope(declarationNode['id']['name'], state.value);\n    state.init_ = false;\n    declarationNode = declarations[++n];\n  }\n  while (declarationNode) {\n    // Skip any declarations that are not initialized.  They have already\n    // been defined as undefined in populateScope_.\n    if (declarationNode['init']) {\n      state.n_ = n;\n      state.init_ = true;\n      return new Interpreter.MyState(declarationNode['init'], state.scope);\n    }\n    declarationNode = declarations[++n];\n  }\n  stack.pop();\n};\n\nprivate stepWithStatement(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  if (!state.doneObject_) {\n    state.doneObject_ = true;\n    return new Interpreter.MyState(node['object'], state.scope);\n  } else if (!state.doneBody_) {\n    state.doneBody_ = true;\n    var scope = this.createSpecialScope(state.scope, state.value);\n    return new Interpreter.MyState(node['body'], scope);\n  } else {\n    stack.pop();\n  }\n};\n\nprivate stepWhileStatement(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {\n  return this.stepDoWhileStatement(stack, state, node);\n}\n}\n\nmodule Interpreter {\n/**\n * Class for an object.\n * @param {Interpreter.MyObject} proto Prototype object or null.\n * @constructor\n */\nexport class MyObject {\n[key: string]: any;\ngetter: any;\nsetter: any;\nproperties: any;\n\nconstructor(proto) {\n  this.getter = Object.create(null);\n  this.setter = Object.create(null);\n  this.properties = Object.create(null);\n  this.proto = proto;\n}\n\n/** @type {Interpreter.MyObject} */\nproto: Interpreter.MyObject = null;\n\n/** @type {boolean} */\nisObject = true;\n\n/** @type {string} */\nclass = 'Object';\n\n/** @type {Date|RegExp|boolean|number|string|undefined|null} */\ndata: Date | RegExp | boolean | number | string | undefined | null = null;\n\n/**\n * Convert this object into a string.\n * @return {string} String value.\n * @override\n */\ntoString() {\n  if (this.class === 'Array') {\n    // Array\n    var cycles = Interpreter.toStringCycles_;\n    cycles.push(this);\n    try {\n      var strs = [];\n      for (var i = 0; i < this.properties.length; i++) {\n        var value = this.properties[i];\n        strs[i] = (value && value.isObject && cycles.indexOf(value) !== -1) ?\n            '...' : value;\n      }\n    } finally {\n      cycles.pop();\n    }\n    return strs.join(',');\n  }\n  if (this.class === 'Error') {\n    var cycles = Interpreter.toStringCycles_;\n    if (cycles.indexOf(this) !== -1) {\n      return '[object Error]';\n    }\n    var name, message;\n    // Bug: Does not support getters and setters for name or message.\n    var obj = <Interpreter.MyObject>this;\n    do {\n      if ('name' in obj.properties) {\n        name = obj.properties['name'];\n        break;\n      }\n    } while ((obj = obj.proto));\n    var obj = <Interpreter.MyObject>this;\n    do {\n      if ('message' in obj.properties) {\n        message = obj.properties['message'];\n        break;\n      }\n    } while ((obj = obj.proto));\n    cycles.push(this);\n    try {\n      name = name && name.toString();\n      message = message && message.toString();\n    } finally {\n      cycles.pop();\n    }\n    return message ? name + ': ' + message : String(name);\n  }\n\n  // RegExp, Date, and boxed primitives.\n  if (this.data !== null) {\n    return String(this.data);\n  }\n\n  return '[object ' + this.class + ']';\n}\n\n/**\n * Return the object's value.\n * @return {Interpreter.MyValue} Value.\n * @override\n */\nvalueOf() {\n  if (this.data === undefined || this.data === null ||\n      this.data instanceof RegExp) {\n    return this; // An Object.\n  }\n  if (this.data instanceof Date) {\n    return this.data.valueOf();  // Milliseconds.\n  }\n  return /** @type {(boolean|number|string)} */ (this.data);  // Boxed primitive.\n}\n}\n\n/**\n * Typedef for JS values.\n * @typedef {!Interpreter.MyObject|boolean|number|string|undefined|null}\n */\nexport type MyValue = MyObject | boolean | number | string | undefined | null;\n\n/**\n * Class for a state.\n * @param {!MyObject} node AST node for the state.\n * @param {!Interpreter.MyObject} scope Scope object for the state.\n * @constructor\n */\nexport class MyState {\n[key: string]: any;\nnode: ESTree.BaseNode;\nscope: Interpreter.MyObject;\nconstructor(node: ESTree.BaseNode, scope: Interpreter.MyObject) {\n  this.node = node;\n  this.scope = scope;\n}\n}\n\nexport interface MyValueTable {\n  pseudo: MyValue[],\n  native: any[]\n}\n\nexport interface MyDescriptor {\n  get?: MyObject;\n  set?: MyObject;\n  configurable?: boolean;\n  enumerable?: boolean;\n  writable?: boolean;\n  value?: any;\n}\n\nexport interface Acorn {\n  parse(code: string, options?: any): ESTree.Program;\n}\n\nexport interface NodeConstructor {\n  new (): ESTree.BaseNode;\n}\n\nexport interface NativeFunction extends Function {\n  id?: number;\n}\n}\n\n// These lines are added for API compatibility\nInterpreter['Object'] = Interpreter.MyObject;\nInterpreter['State'] = Interpreter.MyState;\n\n// Look for globally-defined acorn\ntry {\n  Interpreter.acorn = (self || global)['acorn'];\n} catch (e) {\n  // do nothing if we fail\n}\n\nexport = Interpreter;\n\n\n\n// WEBPACK FOOTER //\n// ./lib/interpreter.ts","var g;\r\n\r\n// This works in non-strict mode\r\ng = (function() {\r\n\treturn this;\r\n})();\r\n\r\ntry {\r\n\t// This works if eval is allowed (see CSP)\r\n\tg = g || Function(\"return this\")() || (1,eval)(\"this\");\r\n} catch(e) {\r\n\t// This works if the window reference is available\r\n\tif(typeof window === \"object\")\r\n\t\tg = window;\r\n}\r\n\r\n// g can still be undefined, but nothing to do about it...\r\n// We return undefined, instead of nothing here, so it's\r\n// easier to handle this case. if(!global) { ...}\r\n\r\nmodule.exports = g;\r\n\n\n\n//////////////////\n// WEBPACK FOOTER\n// (webpack)/buildin/global.js\n// module id = 1\n// module chunks = 0"],"sourceRoot":""}
\ No newline at end of file
diff --git a/dist/interpreter.js b/dist/interpreter.js
new file mode 100644
index 00000000..ffcfcf32
--- /dev/null
+++ b/dist/interpreter.js
@@ -0,0 +1,3238 @@
+/// <reference path="./_estree.d.ts" />
+(function (factory) {
+    if (typeof module === "object" && typeof module.exports === "object") {
+        var v = factory(require, exports);
+        if (v !== undefined) module.exports = v;
+    }
+    else if (typeof define === "function" && define.amd) {
+        define(["require", "exports"], factory);
+    }
+})(function (require, exports) {
+    "use strict";
+    /**
+     * @license
+     * JavaScript Interpreter
+     *
+     * Copyright 2013-2017 Google Inc. and Jun Kato
+     *
+     * Licensed under the Apache License, Version 2.0 (the "License");
+     * you may not use this file except in compliance with the License.
+     * You may obtain a copy of the License at
+     *
+     *   http://www.apache.org/licenses/LICENSE-2.0
+     *
+     * Unless required by applicable law or agreed to in writing, software
+     * distributed under the License is distributed on an "AS IS" BASIS,
+     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     * See the License for the specific language governing permissions and
+     * limitations under the License.
+     */
+    /**
+     * @fileoverview Interpreting JavaScript in JavaScript.
+     * @author fraser@google.com (Neil Fraser)
+     * @author i@junkato.jp (Jun Kato)
+     */
+    /**
+     * Create a new interpreter.
+     * @param {string|!Object} code Raw JavaScript text or AST.
+     * @param {Function=} opt_initFunc Optional initialization function.  Used to
+     *     define APIs.  When called it is passed the interpreter object and the
+     *     global scope object.
+     * @constructor
+     */
+    var Interpreter = (function () {
+        function Interpreter(code, opt_initFunc) {
+            if (typeof code === 'string') {
+                code = Interpreter.acorn.parse(code, Interpreter.PARSE_OPTIONS);
+            }
+            this.ast = code;
+            this.initFunc_ = opt_initFunc;
+            this.paused_ = false;
+            this.polyfills_ = [];
+            // Unique identifier for native functions.  Used in serialization.
+            this.functionCounter_ = 0;
+            // Map node types to our step function names; a property lookup is faster
+            // than string concatenation with "step" prefix.
+            this.stepFunctions_ = Object.create(null);
+            var stepMatch = /^step([A-Z]\w*)$/;
+            var m;
+            var props = Object.getOwnPropertyNames(Interpreter.prototype);
+            for (var i = 0; i < props.length; i++) {
+                var methodName = props[i];
+                if ((typeof Interpreter.prototype[methodName] === 'function') &&
+                    (m = methodName.match(stepMatch))) {
+                    this.stepFunctions_[m[1]] = Interpreter.prototype[methodName].bind(this);
+                }
+            }
+            // Create and initialize the global scope.
+            this.global = this.createScope(this.ast, null);
+            // Run the polyfills.
+            this.ast = Interpreter.acorn.parse(this.polyfills_.join('\n'), Interpreter.PARSE_OPTIONS);
+            this.polyfills_ = undefined; // Allow polyfill strings to garbage collect.
+            this.stripLocations_(this.ast, undefined, undefined);
+            var state = new Interpreter.MyState(this.ast, this.global);
+            state.done = false;
+            this.stateStack = [state];
+            this.run();
+            this.value = undefined;
+            // Point at the main program.
+            this.ast = code;
+            var state = new Interpreter.MyState(this.ast, this.global);
+            state.done = false;
+            this.stateStack.length = 0;
+            this.stateStack[0] = state;
+            // Get a handle on Acorn's node_t object.  It's tricky to access.
+            this.nodeConstructor = state.node.constructor;
+            // Preserve publicly properties from being pruned/renamed by JS compilers.
+            // Add others as needed.
+            this['stateStack'] = this.stateStack;
+            this['OBJECT'] = this.OBJECT;
+            this['OBJECT_PROTO'] = this.OBJECT_PROTO;
+            this['FUNCTION'] = this.FUNCTION;
+            this['FUNCTION_PROTO'] = this.FUNCTION_PROTO;
+            this['ARRAY'] = this.ARRAY;
+            this['ARRAY_PROTO'] = this.ARRAY_PROTO;
+            this['REGEXP'] = this.REGEXP;
+            this['REGEXP_PROTO'] = this.REGEXP_PROTO;
+            // The following properties are obsolete.  Do not use.
+            this['UNDEFINED'] = undefined;
+            this['NULL'] = null;
+            this['NAN'] = NaN;
+            this['TRUE'] = true;
+            this['FALSE'] = false;
+            this['STRING_EMPTY'] = '';
+            this['NUMBER_ZERO'] = 0;
+            this['NUMBER_ONE'] = 1;
+        }
+        ;
+        /**
+         * Add more code to the interpreter.
+         * @param {string|!Object} code Raw JavaScript text or AST.
+         */
+        Interpreter.prototype.appendCode = function (code) {
+            var state = this.stateStack[0];
+            if (!state || state.node['type'] !== 'Program') {
+                throw Error('Expecting original AST to start with a Program node.');
+            }
+            if (typeof code === 'string') {
+                code = Interpreter.acorn.parse(code, Interpreter.PARSE_OPTIONS);
+            }
+            if (!code || code['type'] !== 'Program') {
+                throw Error('Expecting new AST to start with a Program node.');
+            }
+            this.populateScope_(code, state.scope);
+            // Append the new program to the old one.
+            for (var i = 0, node; (node = code['body'][i]); i++) {
+                state.node['body'].push(node);
+            }
+            state.done = false;
+        };
+        ;
+        /**
+         * Execute one step of the interpreter.
+         * @return {boolean} True if a step was executed, false if no more instructions.
+         */
+        Interpreter.prototype.step = function () {
+            var stack = this.stateStack;
+            var state = stack[stack.length - 1];
+            if (!state) {
+                return false;
+            }
+            var node = state.node, type = node['type'];
+            if (type === 'Program' && state.done) {
+                return false;
+            }
+            else if (this.paused_) {
+                return true;
+            }
+            try {
+                var nextState = this.stepFunctions_[type](stack, state, node);
+            }
+            catch (e) {
+                // Eat any step errors.  They have been thrown on the stack.
+                if (e !== Interpreter.STEP_ERROR) {
+                    // Uh oh.  This is a real error in the JS-Interpreter.  Rethrow.
+                    throw e;
+                }
+            }
+            if (nextState) {
+                stack.push(nextState);
+            }
+            if (!node['end']) {
+                // This is polyfill code.  Keep executing until we arrive at user code.
+                return this.step();
+            }
+            return true;
+        };
+        ;
+        /**
+         * Execute the interpreter to program completion.  Vulnerable to infinite loops.
+         * @return {boolean} True if a execution is asynchronously blocked,
+         *     false if no more instructions.
+         */
+        Interpreter.prototype.run = function () {
+            while (!this.paused_ && this.step()) { }
+            return this.paused_;
+        };
+        ;
+        /**
+         * Initialize the global scope with buitin properties and functions.
+         * @param {!Interpreter.MyObject} scope Global scope.
+         */
+        Interpreter.prototype.initGlobalScope = function (scope) {
+            // Initialize uneditable global properties.
+            this.setProperty(scope, 'NaN', NaN, Interpreter.READONLY_DESCRIPTOR);
+            this.setProperty(scope, 'Infinity', Infinity, Interpreter.READONLY_DESCRIPTOR);
+            this.setProperty(scope, 'undefined', undefined, Interpreter.READONLY_DESCRIPTOR);
+            this.setProperty(scope, 'window', scope, Interpreter.READONLY_DESCRIPTOR);
+            this.setProperty(scope, 'this', scope, Interpreter.READONLY_DESCRIPTOR);
+            this.setProperty(scope, 'self', scope); // Editable.
+            // Create the objects which will become Object.prototype and
+            // Function.prototype, which are needed to bootstrap everything else.
+            this.OBJECT_PROTO = new Interpreter.MyObject(null);
+            this.FUNCTION_PROTO = new Interpreter.MyObject(this.OBJECT_PROTO);
+            // Initialize global objects.
+            this.initFunction(scope);
+            this.initObject(scope);
+            // Unable to set scope's parent prior (OBJECT did not exist).
+            // Note that in a browser this would be 'Window', whereas in Node.js it would
+            // be 'Object'.  This interpreter is closer to Node in that it has no DOM.
+            scope.proto = this.OBJECT_PROTO;
+            this.setProperty(scope, 'constructor', this.OBJECT);
+            this.initArray(scope);
+            this.initString(scope);
+            this.initBoolean(scope);
+            this.initNumber(scope);
+            this.initDate(scope);
+            this.initRegExp(scope);
+            this.initError(scope);
+            this.initMath(scope);
+            this.initJSON(scope);
+            // Initialize global functions.
+            var thisInterpreter = this;
+            var func = this.createNativeFunction(function (x) { throw EvalError("Can't happen"); }, false);
+            func.eval = true;
+            this.setProperty(scope, 'eval', func);
+            this.setProperty(scope, 'parseInt', this.createNativeFunction(parseInt, false));
+            this.setProperty(scope, 'parseFloat', this.createNativeFunction(parseFloat, false));
+            this.setProperty(scope, 'isNaN', this.createNativeFunction(isNaN, false));
+            this.setProperty(scope, 'isFinite', this.createNativeFunction(isFinite, false));
+            var strFunctions = [
+                [escape, 'escape'], [unescape, 'unescape'],
+                [decodeURI, 'decodeURI'], [decodeURIComponent, 'decodeURIComponent'],
+                [encodeURI, 'encodeURI'], [encodeURIComponent, 'encodeURIComponent']
+            ];
+            for (var i = 0; i < strFunctions.length; i++) {
+                var wrapper = (function (nativeFunc) {
+                    return function (str) {
+                        try {
+                            return nativeFunc(str);
+                        }
+                        catch (e) {
+                            // decodeURI('%xy') will throw an error.  Catch and rethrow.
+                            thisInterpreter.throwException(thisInterpreter.URI_ERROR, e.message);
+                        }
+                    };
+                })(strFunctions[i][0]);
+                this.setProperty(scope, strFunctions[i][1], this.createNativeFunction(wrapper, false), Interpreter.NONENUMERABLE_DESCRIPTOR);
+            }
+            // Run any user-provided initialization.
+            if (this.initFunc_) {
+                this.initFunc_(this, scope);
+            }
+        };
+        ;
+        /**
+         * Initialize the Function class.
+         * @param {!Interpreter.MyObject} scope Global scope.
+         */
+        Interpreter.prototype.initFunction = function (scope) {
+            var thisInterpreter = this;
+            var wrapper;
+            var identifierRegexp = /^[A-Za-z_$][\w$]*$/;
+            // Function constructor.
+            wrapper = function (var_args) {
+                if (thisInterpreter.calledWithNew()) {
+                    // Called as new Function().
+                    var newFunc = this;
+                }
+                else {
+                    // Called as Function().
+                    var newFunc = thisInterpreter.createObjectProto(thisInterpreter.FUNCTION_PROTO);
+                }
+                if (arguments.length) {
+                    var code = String(arguments[arguments.length - 1]);
+                }
+                else {
+                    var code = '';
+                }
+                var args = [];
+                for (var i = 0; i < arguments.length - 1; i++) {
+                    var name = String(arguments[i]);
+                    if (!name.match(identifierRegexp)) {
+                        thisInterpreter.throwException(thisInterpreter.SYNTAX_ERROR, 'Invalid function argument: ' + name);
+                    }
+                    args.push(name);
+                }
+                args = args.join(', ');
+                // Interestingly, the scope for constructed functions is the global scope,
+                // even if they were constructed in some other scope.
+                newFunc.parentScope = thisInterpreter.global;
+                // Acorn needs to parse code in the context of a function or else 'return'
+                // statements will be syntax errors.
+                try {
+                    var ast = Interpreter.acorn.parse('$ = function(' + args + ') {' + code + '};', Interpreter.PARSE_OPTIONS);
+                }
+                catch (e) {
+                    // Acorn threw a SyntaxError.  Rethrow as a trappable error.
+                    thisInterpreter.throwException(thisInterpreter.SYNTAX_ERROR, 'Invalid code: ' + e.message);
+                }
+                if (ast['body'].length !== 1) {
+                    // Function('a', 'return a + 6;}; {alert(1);');
+                    thisInterpreter.throwException(thisInterpreter.SYNTAX_ERROR, 'Invalid code in function body.');
+                }
+                newFunc.node = ast['body'][0]['expression']['right'];
+                thisInterpreter.setProperty(newFunc, 'length', newFunc.node['length'], Interpreter.READONLY_DESCRIPTOR);
+                return newFunc;
+            };
+            wrapper.id = this.functionCounter_++;
+            this.FUNCTION = this.createObjectProto(this.FUNCTION_PROTO);
+            this.setProperty(scope, 'Function', this.FUNCTION);
+            // Manually setup type and prototype because createObj doesn't recognize
+            // this object as a function (this.FUNCTION did not exist).
+            this.setProperty(this.FUNCTION, 'prototype', this.FUNCTION_PROTO);
+            this.FUNCTION.nativeFunc = wrapper;
+            // Configure Function.prototype.
+            this.setProperty(this.FUNCTION_PROTO, 'constructor', this.FUNCTION, Interpreter.NONENUMERABLE_DESCRIPTOR);
+            this.FUNCTION_PROTO.nativeFunc = function () { };
+            this.FUNCTION_PROTO.nativeFunc.id = this.functionCounter_++;
+            this.setProperty(this.FUNCTION_PROTO, 'length', 0, Interpreter.READONLY_DESCRIPTOR);
+            var boxThis = function (value) {
+                // In non-strict mode 'this' must be an object.
+                if ((!value || !value.isObject) && !thisInterpreter.getScope().strict) {
+                    if (value === undefined || value === null) {
+                        // 'Undefined' and 'null' are changed to global object.
+                        value = thisInterpreter.global;
+                    }
+                    else {
+                        // Primitives must be boxed in non-strict mode.
+                        var box = thisInterpreter.createObjectProto(thisInterpreter.getPrototype(value));
+                        box.data = value;
+                        value = box;
+                    }
+                }
+                return value;
+            };
+            wrapper = function (thisArg, args) {
+                var state = thisInterpreter.stateStack[thisInterpreter.stateStack.length - 1];
+                // Rewrite the current 'CallExpression' to apply a different function.
+                state.func_ = this;
+                // Assign the 'this' object.
+                state.funcThis_ = boxThis(thisArg);
+                // Bind any provided arguments.
+                state.arguments_ = [];
+                if (args !== null && args !== undefined) {
+                    if (args.isObject) {
+                        state.arguments_ = thisInterpreter.pseudoToNative(args);
+                    }
+                    else {
+                        thisInterpreter.throwException(thisInterpreter.TYPE_ERROR, 'CreateListFromArrayLike called on non-object');
+                    }
+                }
+                state.doneExec_ = false;
+            };
+            this.setNativeFunctionPrototype(this.FUNCTION, 'apply', wrapper);
+            wrapper = function (thisArg, var_args) {
+                var state = thisInterpreter.stateStack[thisInterpreter.stateStack.length - 1];
+                // Rewrite the current 'CallExpression' to call a different function.
+                state.func_ = this;
+                // Assign the 'this' object.
+                state.funcThis_ = boxThis(thisArg);
+                // Bind any provided arguments.
+                state.arguments_ = [];
+                for (var i = 1; i < arguments.length; i++) {
+                    state.arguments_.push(arguments[i]);
+                }
+                state.doneExec_ = false;
+            };
+            this.setNativeFunctionPrototype(this.FUNCTION, 'call', wrapper);
+            this.polyfills_.push(
+            // Polyfill copied from:
+            // developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_objects/Function/bind
+            "Object.defineProperty(Function.prototype, 'bind',", "{configurable: true, writable: true, value:", "function(oThis) {", "if (typeof this !== 'function') {", "throw TypeError('What is trying to be bound is not callable');", "}", "var aArgs   = Array.prototype.slice.call(arguments, 1),", "fToBind = this,", "fNOP    = function() {},", "fBound  = function() {", "return fToBind.apply(this instanceof fNOP", "? this", ": oThis,", "aArgs.concat(Array.prototype.slice.call(arguments)));", "};", "if (this.prototype) {", "fNOP.prototype = this.prototype;", "}", "fBound.prototype = new fNOP();", "return fBound;", "}", "});", "");
+            // Function has no parent to inherit from, so it needs its own mandatory
+            // toString and valueOf functions.
+            wrapper = function () {
+                return this.toString();
+            };
+            this.setNativeFunctionPrototype(this.FUNCTION, 'toString', wrapper);
+            this.setProperty(this.FUNCTION, 'toString', this.createNativeFunction(wrapper, false), Interpreter.NONENUMERABLE_DESCRIPTOR);
+            wrapper = function () {
+                return this.valueOf();
+            };
+            this.setNativeFunctionPrototype(this.FUNCTION, 'valueOf', wrapper);
+            this.setProperty(this.FUNCTION, 'valueOf', this.createNativeFunction(wrapper, false), Interpreter.NONENUMERABLE_DESCRIPTOR);
+        };
+        ;
+        /**
+         * Initialize the Object class.
+         * @param {!Interpreter.MyObject} scope Global scope.
+         */
+        Interpreter.prototype.initObject = function (scope) {
+            var thisInterpreter = this;
+            var wrapper;
+            // Object constructor.
+            wrapper = function (value) {
+                if (value === undefined || value === null) {
+                    // Create a new object.
+                    if (thisInterpreter.calledWithNew()) {
+                        // Called as new Object().
+                        return this;
+                    }
+                    else {
+                        // Called as Object().
+                        return thisInterpreter.createObjectProto(thisInterpreter.OBJECT_PROTO);
+                    }
+                }
+                if (!value.isObject) {
+                    // Wrap the value as an object.
+                    var box = thisInterpreter.createObjectProto(thisInterpreter.getPrototype(value));
+                    box.data = value;
+                    return box;
+                }
+                // Return the provided object.
+                return value;
+            };
+            this.OBJECT = this.createNativeFunction(wrapper, true);
+            // Throw away the created prototype and use the root prototype.
+            this.setProperty(this.OBJECT, 'prototype', this.OBJECT_PROTO);
+            this.setProperty(this.OBJECT_PROTO, 'constructor', this.OBJECT);
+            this.setProperty(scope, 'Object', this.OBJECT);
+            /**
+             * Checks if the provided value is null or undefined.
+             * If so, then throw an error in the call stack.
+             * @param {Interpreter.MyValue} value Value to check.
+             */
+            var throwIfNullUndefined = function (value) {
+                if (value === undefined || value === null) {
+                    thisInterpreter.throwException(thisInterpreter.TYPE_ERROR, "Cannot convert '" + value + "' to object");
+                }
+            };
+            // Static methods on Object.
+            wrapper = function (obj) {
+                throwIfNullUndefined(obj);
+                var props = obj.isObject ? obj.properties : obj;
+                return thisInterpreter.nativeToPseudo(Object.getOwnPropertyNames(props));
+            };
+            this.setProperty(this.OBJECT, 'getOwnPropertyNames', this.createNativeFunction(wrapper, false), Interpreter.NONENUMERABLE_DESCRIPTOR);
+            wrapper = function (obj) {
+                throwIfNullUndefined(obj);
+                if (!obj.isObject) {
+                    return thisInterpreter.nativeToPseudo(Object.keys(obj));
+                }
+                return thisInterpreter.nativeToPseudo(Object.keys(obj.properties));
+            };
+            this.setProperty(this.OBJECT, 'keys', this.createNativeFunction(wrapper, false), Interpreter.NONENUMERABLE_DESCRIPTOR);
+            wrapper = function (proto) {
+                // Support for the second argument is the responsibility of a polyfill.
+                if (proto === null) {
+                    return thisInterpreter.createObjectProto(null);
+                }
+                if (proto === undefined || !proto.isObject) {
+                    thisInterpreter.throwException(thisInterpreter.TYPE_ERROR, 'Object prototype may only be an Object or null');
+                }
+                return thisInterpreter.createObjectProto(proto);
+            };
+            this.setProperty(this.OBJECT, 'create', this.createNativeFunction(wrapper, false), Interpreter.NONENUMERABLE_DESCRIPTOR);
+            // Add a polyfill to handle create's second argument.
+            this.polyfills_.push("(function() {", "var create_ = Object.create;", "Object.create = function(proto, props) {", "var obj = create_(proto);", "props && Object.defineProperties(obj, props);", "return obj;", "};", "})();", "");
+            wrapper = function (obj, prop, descriptor) {
+                prop = String(prop);
+                if (!obj || !obj.isObject) {
+                    thisInterpreter.throwException(thisInterpreter.TYPE_ERROR, 'Object.defineProperty called on non-object');
+                }
+                if (!descriptor || !descriptor.isObject) {
+                    thisInterpreter.throwException(thisInterpreter.TYPE_ERROR, 'Property description must be an object');
+                }
+                if (!obj.properties[prop] && obj.preventExtensions) {
+                    thisInterpreter.throwException(thisInterpreter.TYPE_ERROR, "Can't define property '" + prop + "', object is not extensible");
+                }
+                // The polyfill guarantees no inheritance and no getter functions.
+                // Therefore the descriptor properties map is the native object needed.
+                thisInterpreter.setProperty(obj, prop, ReferenceError, descriptor.properties);
+                return obj;
+            };
+            this.setProperty(this.OBJECT, 'defineProperty', this.createNativeFunction(wrapper, false), Interpreter.NONENUMERABLE_DESCRIPTOR);
+            this.polyfills_.push(
+            // Flatten the descriptor to remove any inheritance or getter functions.
+            "(function() {", "var defineProperty_ = Object.defineProperty;", "Object.defineProperty = function(obj, prop, d1) {", "var d2 = {};", "if ('configurable' in d1) d2.configurable = d1.configurable;", "if ('enumerable' in d1) d2.enumerable = d1.enumerable;", "if ('writable' in d1) d2.writable = d1.writable;", "if ('value' in d1) d2.value = d1.value;", "if ('get' in d1) d2.get = d1.get;", "if ('set' in d1) d2.set = d1.set;", "return defineProperty_(obj, prop, d2);", "};", "})();", "Object.defineProperty(Object, 'defineProperties',", "{configurable: true, writable: true, value:", "function(obj, props) {", "var keys = Object.keys(props);", "for (var i = 0; i < keys.length; i++) {", "Object.defineProperty(obj, keys[i], props[keys[i]]);", "}", "return obj;", "}", "});", "");
+            wrapper = function (obj, prop) {
+                if (!obj || !obj.isObject) {
+                    thisInterpreter.throwException(thisInterpreter.TYPE_ERROR, 'Object.getOwnPropertyDescriptor called on non-object');
+                }
+                prop = String(prop);
+                if (!(prop in obj.properties)) {
+                    return undefined;
+                }
+                var descriptor = Object.getOwnPropertyDescriptor(obj.properties, prop);
+                var getter = obj.getter[prop];
+                var setter = obj.setter[prop];
+                if (getter || setter) {
+                    descriptor.get = getter;
+                    descriptor.set = setter;
+                    delete descriptor.value;
+                    delete descriptor.writable;
+                }
+                var pseudoDescriptor = thisInterpreter.nativeToPseudo(descriptor);
+                if ('value' in descriptor) {
+                    thisInterpreter.setProperty(pseudoDescriptor, 'value', descriptor.value);
+                }
+                return pseudoDescriptor;
+            };
+            this.setProperty(this.OBJECT, 'getOwnPropertyDescriptor', this.createNativeFunction(wrapper, false), Interpreter.NONENUMERABLE_DESCRIPTOR);
+            wrapper = function (obj) {
+                throwIfNullUndefined(obj);
+                return thisInterpreter.getPrototype(obj);
+            };
+            this.setProperty(this.OBJECT, 'getPrototypeOf', this.createNativeFunction(wrapper, false), Interpreter.NONENUMERABLE_DESCRIPTOR);
+            wrapper = function (obj) {
+                return Boolean(obj) && !obj.preventExtensions;
+            };
+            this.setProperty(this.OBJECT, 'isExtensible', this.createNativeFunction(wrapper, false), Interpreter.NONENUMERABLE_DESCRIPTOR);
+            wrapper = function (obj) {
+                if (obj && obj.isObject) {
+                    obj.preventExtensions = true;
+                }
+                return obj;
+            };
+            this.setProperty(this.OBJECT, 'preventExtensions', this.createNativeFunction(wrapper, false), Interpreter.NONENUMERABLE_DESCRIPTOR);
+            // Instance methods on Object.
+            this.setNativeFunctionPrototype(this.OBJECT, 'toString', Interpreter.MyObject.prototype.toString);
+            this.setNativeFunctionPrototype(this.OBJECT, 'toLocaleString', Interpreter.MyObject.prototype.toString);
+            this.setNativeFunctionPrototype(this.OBJECT, 'valueOf', Interpreter.MyObject.prototype.valueOf);
+            wrapper = function (prop) {
+                throwIfNullUndefined(this);
+                if (!this.isObject) {
+                    return this.hasOwnProperty(prop);
+                }
+                return String(prop) in this.properties;
+            };
+            this.setNativeFunctionPrototype(this.OBJECT, 'hasOwnProperty', wrapper);
+            wrapper = function (prop) {
+                throwIfNullUndefined(this);
+                return Object.prototype.propertyIsEnumerable.call(this.properties, prop);
+            };
+            this.setNativeFunctionPrototype(this.OBJECT, 'propertyIsEnumerable', wrapper);
+            wrapper = function (obj) {
+                while (true) {
+                    // Note, circular loops shouldn't be possible.
+                    obj = thisInterpreter.getPrototype(obj);
+                    if (!obj) {
+                        // No parent; reached the top.
+                        return false;
+                    }
+                    if (obj === this) {
+                        return true;
+                    }
+                }
+            };
+            this.setNativeFunctionPrototype(this.OBJECT, 'isPrototypeOf', wrapper);
+        };
+        ;
+        /**
+         * Initialize the Array class.
+         * @param {!Interpreter.MyObject} scope Global scope.
+         */
+        Interpreter.prototype.initArray = function (scope) {
+            var thisInterpreter = this;
+            var getInt = function (obj, def) {
+                // Return an integer, or the default.
+                var n = obj ? Math.floor(obj) : def;
+                if (isNaN(n)) {
+                    n = def;
+                }
+                return n;
+            };
+            var wrapper;
+            // Array constructor.
+            wrapper = function (var_args) {
+                if (thisInterpreter.calledWithNew()) {
+                    // Called as new Array().
+                    var newArray = this;
+                }
+                else {
+                    // Called as Array().
+                    var newArray = thisInterpreter.createObjectProto(thisInterpreter.ARRAY_PROTO);
+                }
+                var first = arguments[0];
+                if (arguments.length === 1 && typeof first === 'number') {
+                    if (isNaN(Interpreter.legalArrayLength(first))) {
+                        thisInterpreter.throwException(thisInterpreter.RANGE_ERROR, 'Invalid array length');
+                    }
+                    newArray.properties.length = first;
+                }
+                else {
+                    for (var i = 0; i < arguments.length; i++) {
+                        newArray.properties[i] = arguments[i];
+                    }
+                    newArray.properties.length = i;
+                }
+                return newArray;
+            };
+            this.ARRAY = this.createNativeFunction(wrapper, true);
+            this.ARRAY_PROTO = this.ARRAY.properties['prototype'];
+            this.setProperty(scope, 'Array', this.ARRAY);
+            // Static methods on Array.
+            wrapper = function (obj) {
+                return obj && obj.class === 'Array';
+            };
+            this.setProperty(this.ARRAY, 'isArray', this.createNativeFunction(wrapper, false), Interpreter.NONENUMERABLE_DESCRIPTOR);
+            // Instance methods on Array.
+            wrapper = function () {
+                return Array.prototype.pop.call(this.properties);
+            };
+            this.setNativeFunctionPrototype(this.ARRAY, 'pop', wrapper);
+            wrapper = function (var_args) {
+                return Array.prototype.push.apply(this.properties, arguments);
+            };
+            this.setNativeFunctionPrototype(this.ARRAY, 'push', wrapper);
+            wrapper = function () {
+                return Array.prototype.shift.call(this.properties);
+            };
+            this.setNativeFunctionPrototype(this.ARRAY, 'shift', wrapper);
+            wrapper = function (var_args) {
+                return Array.prototype.unshift.apply(this.properties, arguments);
+            };
+            this.setNativeFunctionPrototype(this.ARRAY, 'unshift', wrapper);
+            wrapper = function () {
+                Array.prototype.reverse.call(this.properties);
+                return this;
+            };
+            this.setNativeFunctionPrototype(this.ARRAY, 'reverse', wrapper);
+            wrapper = function (index, howmany /*, var_args*/) {
+                var list = Array.prototype.splice.apply(this.properties, arguments);
+                return thisInterpreter.nativeToPseudo(list);
+            };
+            this.setNativeFunctionPrototype(this.ARRAY, 'splice', wrapper);
+            wrapper = function (opt_begin, opt_end) {
+                var list = Array.prototype.slice.call(this.properties, opt_begin, opt_end);
+                return thisInterpreter.nativeToPseudo(list);
+            };
+            this.setNativeFunctionPrototype(this.ARRAY, 'slice', wrapper);
+            wrapper = function (opt_separator) {
+                return Array.prototype.join.call(this.properties, opt_separator);
+            };
+            this.setNativeFunctionPrototype(this.ARRAY, 'join', wrapper);
+            wrapper = function (var_args) {
+                var list = [];
+                var length = 0;
+                // Start by copying the current array.
+                var iLength = thisInterpreter.getProperty(this, 'length');
+                for (var i = 0; i < iLength; i++) {
+                    if (thisInterpreter.hasProperty(this, i)) {
+                        var element = thisInterpreter.getProperty(this, i);
+                        list[length] = element;
+                    }
+                    length++;
+                }
+                // Loop through all arguments and copy them in.
+                for (var i = 0; i < arguments.length; i++) {
+                    var value = arguments[i];
+                    if (thisInterpreter.isa(value, thisInterpreter.ARRAY)) {
+                        var jLength = thisInterpreter.getProperty(value, 'length');
+                        for (var j = 0; j < jLength; j++) {
+                            if (thisInterpreter.hasProperty(value, j)) {
+                                list[length] = thisInterpreter.getProperty(value, j);
+                            }
+                            length++;
+                        }
+                    }
+                    else {
+                        list[length] = value;
+                    }
+                }
+                return thisInterpreter.nativeToPseudo(list);
+            };
+            this.setNativeFunctionPrototype(this.ARRAY, 'concat', wrapper);
+            wrapper = function (searchElement, opt_fromIndex) {
+                return Array.prototype.indexOf.apply(this.properties, arguments);
+            };
+            this.setNativeFunctionPrototype(this.ARRAY, 'indexOf', wrapper);
+            wrapper = function (searchElement, opt_fromIndex) {
+                return Array.prototype.lastIndexOf.apply(this.properties, arguments);
+            };
+            this.setNativeFunctionPrototype(this.ARRAY, 'lastIndexOf', wrapper);
+            wrapper = function () {
+                Array.prototype.sort.call(this.properties);
+                return this;
+            };
+            this.setNativeFunctionPrototype(this.ARRAY, 'sort', wrapper);
+            this.polyfills_.push(
+            // Polyfill copied from:
+            // developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Array/every
+            "Object.defineProperty(Array.prototype, 'every',", "{configurable: true, writable: true, value:", "function(callbackfn, thisArg) {", "if (!this || typeof callbackfn !== 'function') throw TypeError();", "var T, k;", "var O = Object(this);", "var len = O.length >>> 0;", "if (arguments.length > 1) T = thisArg;", "k = 0;", "while (k < len) {", "if (k in O && !callbackfn.call(T, O[k], k, O)) return false;", "k++;", "}", "return true;", "}", "});", 
+            // Polyfill copied from:
+            // developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Array/filter
+            "Object.defineProperty(Array.prototype, 'filter',", "{configurable: true, writable: true, value:", "function(fun/*, thisArg*/) {", "if (this === void 0 || this === null || typeof fun !== 'function') throw TypeError();", "var t = Object(this);", "var len = t.length >>> 0;", "var res = [];", "var thisArg = arguments.length >= 2 ? arguments[1] : void 0;", "for (var i = 0; i < len; i++) {", "if (i in t) {", "var val = t[i];", "if (fun.call(thisArg, val, i, t)) res.push(val);", "}", "}", "return res;", "}", "});", 
+            // Polyfill copied from:
+            // developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Array/forEach
+            "Object.defineProperty(Array.prototype, 'forEach',", "{configurable: true, writable: true, value:", "function(callback, thisArg) {", "if (!this || typeof callback !== 'function') throw TypeError();", "var T, k;", "var O = Object(this);", "var len = O.length >>> 0;", "if (arguments.length > 1) T = thisArg;", "k = 0;", "while (k < len) {", "if (k in O) callback.call(T, O[k], k, O);", "k++;", "}", "}", "});", 
+            // Polyfill copied from:
+            // developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Array/map
+            "Object.defineProperty(Array.prototype, 'map',", "{configurable: true, writable: true, value:", "function(callback, thisArg) {", "if (!this || typeof callback !== 'function') new TypeError;", "var T, A, k;", "var O = Object(this);", "var len = O.length >>> 0;", "if (arguments.length > 1) T = thisArg;", "A = new Array(len);", "k = 0;", "while (k < len) {", "if (k in O) A[k] = callback.call(T, O[k], k, O);", "k++;", "}", "return A;", "}", "});", 
+            // Polyfill copied from:
+            // developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Array/Reduce
+            "Object.defineProperty(Array.prototype, 'reduce',", "{configurable: true, writable: true, value:", "function(callback /*, initialValue*/) {", "if (!this || typeof callback !== 'function') throw TypeError();", "var t = Object(this), len = t.length >>> 0, k = 0, value;", "if (arguments.length === 2) {", "value = arguments[1];", "} else {", "while (k < len && !(k in t)) k++;", "if (k >= len) {", "throw TypeError('Reduce of empty array with no initial value');", "}", "value = t[k++];", "}", "for (; k < len; k++) {", "if (k in t) value = callback(value, t[k], k, t);", "}", "return value;", "}", "});", 
+            // Polyfill copied from:
+            // developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Array/ReduceRight
+            "Object.defineProperty(Array.prototype, 'reduceRight',", "{configurable: true, writable: true, value:", "function(callback /*, initialValue*/) {", "if (null === this || 'undefined' === typeof this || 'function' !== typeof callback) throw TypeError();", "var t = Object(this), len = t.length >>> 0, k = len - 1, value;", "if (arguments.length >= 2) {", "value = arguments[1];", "} else {", "while (k >= 0 && !(k in t)) k--;", "if (k < 0) {", "throw TypeError('Reduce of empty array with no initial value');", "}", "value = t[k--];", "}", "for (; k >= 0; k--) {", "if (k in t) value = callback(value, t[k], k, t);", "}", "return value;", "}", "});", 
+            // Polyfill copied from:
+            // developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Array/some
+            "Object.defineProperty(Array.prototype, 'some',", "{configurable: true, writable: true, value:", "function(fun/*, thisArg*/) {", "if (!this || typeof fun !== 'function') throw TypeError();", "var t = Object(this);", "var len = t.length >>> 0;", "var thisArg = arguments.length >= 2 ? arguments[1] : void 0;", "for (var i = 0; i < len; i++) {", "if (i in t && fun.call(thisArg, t[i], i, t)) {", "return true;", "}", "}", "return false;", "}", "});", "(function() {", "var sort_ = Array.prototype.sort;", "Array.prototype.sort = function(opt_comp) {", 
+            // Fast native sort.
+            "if (typeof opt_comp !== 'function') {", "return sort_.call(this);", "}", 
+            // Slow bubble sort.
+            "for (var i = 0; i < this.length; i++) {", "var changes = 0;", "for (var j = 0; j < this.length - i - 1; j++) {", "if (opt_comp(this[j], this[j + 1]) > 0) {", "var swap = this[j];", "this[j] = this[j + 1];", "this[j + 1] = swap;", "changes++;", "}", "}", "if (!changes) break;", "}", "return this;", "};", "})();", "Object.defineProperty(Array.prototype, 'toLocaleString',", "{configurable: true, writable: true, value:", "function() {", "var out = [];", "for (var i = 0; i < this.length; i++) {", "out[i] = (this[i] === null || this[i] === undefined) ? '' : this[i].toLocaleString();", "}", "return out.join(',');", "}", "});", "");
+        };
+        ;
+        /**
+         * Initialize the String class.
+         * @param {!Interpreter.MyObject} scope Global scope.
+         */
+        Interpreter.prototype.initString = function (scope) {
+            var thisInterpreter = this;
+            var wrapper;
+            // String constructor.
+            wrapper = function (value) {
+                value = String(value);
+                if (thisInterpreter.calledWithNew()) {
+                    // Called as new String().
+                    this.data = value;
+                    return this;
+                }
+                else {
+                    // Called as String().
+                    return value;
+                }
+            };
+            this.STRING = this.createNativeFunction(wrapper, true);
+            this.setProperty(scope, 'String', this.STRING);
+            // Static methods on String.
+            this.setProperty(this.STRING, 'fromCharCode', this.createNativeFunction(String.fromCharCode, false), Interpreter.NONENUMERABLE_DESCRIPTOR);
+            // Instance methods on String.
+            // Methods with exclusively primitive arguments.
+            var functions = ['trim', 'toLowerCase', 'toUpperCase',
+                'toLocaleLowerCase', 'toLocaleUpperCase', 'charAt', 'charCodeAt',
+                'substring', 'slice', 'substr', 'indexOf', 'lastIndexOf', 'concat'];
+            for (var i = 0; i < functions.length; i++) {
+                this.setNativeFunctionPrototype(this.STRING, functions[i], String.prototype[functions[i]]);
+            }
+            wrapper = function (compareString, locales, options) {
+                locales = locales ? thisInterpreter.pseudoToNative(locales) : undefined;
+                options = options ? thisInterpreter.pseudoToNative(options) : undefined;
+                return String(this).localeCompare(compareString, locales, options);
+            };
+            this.setNativeFunctionPrototype(this.STRING, 'localeCompare', wrapper);
+            wrapper = function (separator, limit) {
+                if (thisInterpreter.isa(separator, thisInterpreter.REGEXP)) {
+                    separator = separator.data;
+                }
+                var jsList = String(this).split(separator, limit);
+                return thisInterpreter.nativeToPseudo(jsList);
+            };
+            this.setNativeFunctionPrototype(this.STRING, 'split', wrapper);
+            wrapper = function (regexp) {
+                regexp = regexp ? regexp.data : undefined;
+                var match = String(this).match(regexp);
+                if (!match) {
+                    return null;
+                }
+                return thisInterpreter.nativeToPseudo(match);
+            };
+            this.setNativeFunctionPrototype(this.STRING, 'match', wrapper);
+            wrapper = function (regexp) {
+                if (thisInterpreter.isa(regexp, thisInterpreter.REGEXP)) {
+                    regexp = regexp.data;
+                }
+                return String(this).search(regexp);
+            };
+            this.setNativeFunctionPrototype(this.STRING, 'search', wrapper);
+            wrapper = function (substr, newSubstr) {
+                // Support for function replacements is the responsibility of a polyfill.
+                return String(this).replace(substr.data || substr, newSubstr);
+            };
+            this.setNativeFunctionPrototype(this.STRING, 'replace', wrapper);
+            // Add a polyfill to handle replace's second argument being a function.
+            this.polyfills_.push("(function() {", "var replace_ = String.prototype.replace;", "String.prototype.replace = function(substr, newSubstr) {", "if (typeof newSubstr !== 'function') {", 
+            // string.replace(string|regexp, string)
+            "return replace_.call(this, substr, newSubstr);", "}", "var str = this;", "if (substr instanceof RegExp) {", // string.replace(regexp, function)
+            "var subs = [];", "var m = substr.exec(str);", "while (m) {", "m.push(m.index, str);", "var inject = newSubstr.apply(null, m);", "subs.push([m.index, m[0].length, inject]);", "m = substr.global ? substr.exec(str) : null;", "}", "for (var i = subs.length - 1; i >= 0; i--) {", "str = str.substring(0, subs[i][0]) + subs[i][2] + " +
+                "str.substring(subs[i][0] + subs[i][1]);", "}", "} else {", // string.replace(string, function)
+            "var i = str.indexOf(substr);", "if (i !== -1) {", "var inject = newSubstr(str.substr(i, substr.length), i, str);", "str = str.substring(0, i) + inject + " +
+                "str.substring(i + substr.length);", "}", "}", "return str;", "};", "})();", "");
+        };
+        ;
+        /**
+         * Initialize the Boolean class.
+         * @param {!Interpreter.MyObject} scope Global scope.
+         */
+        Interpreter.prototype.initBoolean = function (scope) {
+            var thisInterpreter = this;
+            var wrapper;
+            // Boolean constructor.
+            wrapper = function (value) {
+                value = Boolean(value);
+                if (thisInterpreter.calledWithNew()) {
+                    // Called as new Boolean().
+                    this.data = value;
+                    return this;
+                }
+                else {
+                    // Called as Boolean().
+                    return value;
+                }
+            };
+            this.BOOLEAN = this.createNativeFunction(wrapper, true);
+            this.setProperty(scope, 'Boolean', this.BOOLEAN);
+        };
+        ;
+        /**
+         * Initialize the Number class.
+         * @param {!Interpreter.MyObject} scope Global scope.
+         */
+        Interpreter.prototype.initNumber = function (scope) {
+            var thisInterpreter = this;
+            var wrapper;
+            // Number constructor.
+            wrapper = function (value) {
+                value = Number(value);
+                if (thisInterpreter.calledWithNew()) {
+                    // Called as new Number().
+                    this.data = value;
+                    return this;
+                }
+                else {
+                    // Called as Number().
+                    return value;
+                }
+            };
+            this.NUMBER = this.createNativeFunction(wrapper, true);
+            this.setProperty(scope, 'Number', this.NUMBER);
+            var numConsts = ['MAX_VALUE', 'MIN_VALUE', 'NaN', 'NEGATIVE_INFINITY',
+                'POSITIVE_INFINITY'];
+            for (var i = 0; i < numConsts.length; i++) {
+                this.setProperty(this.NUMBER, numConsts[i], Number[numConsts[i]], Interpreter.READONLY_NONENUMERABLE_DESCRIPTOR);
+            }
+            // Instance methods on Number.
+            wrapper = function (fractionDigits) {
+                try {
+                    return Number(this).toExponential(fractionDigits);
+                }
+                catch (e) {
+                    // Throws if fractionDigits isn't within 0-20.
+                    thisInterpreter.throwException(thisInterpreter.ERROR, e.message);
+                }
+            };
+            this.setNativeFunctionPrototype(this.NUMBER, 'toExponential', wrapper);
+            wrapper = function (digits) {
+                try {
+                    return Number(this).toFixed(digits);
+                }
+                catch (e) {
+                    // Throws if digits isn't within 0-20.
+                    thisInterpreter.throwException(thisInterpreter.ERROR, e.message);
+                }
+            };
+            this.setNativeFunctionPrototype(this.NUMBER, 'toFixed', wrapper);
+            wrapper = function (precision) {
+                try {
+                    return Number(this).toPrecision(precision);
+                }
+                catch (e) {
+                    // Throws if precision isn't within range (depends on implementation).
+                    thisInterpreter.throwException(thisInterpreter.ERROR, e.message);
+                }
+            };
+            this.setNativeFunctionPrototype(this.NUMBER, 'toPrecision', wrapper);
+            wrapper = function (radix) {
+                try {
+                    return Number(this).toString(radix);
+                }
+                catch (e) {
+                    // Throws if radix isn't within 2-36.
+                    thisInterpreter.throwException(thisInterpreter.ERROR, e.message);
+                }
+            };
+            this.setNativeFunctionPrototype(this.NUMBER, 'toString', wrapper);
+            wrapper = function (locales, options) {
+                locales = locales ? thisInterpreter.pseudoToNative(locales) : undefined;
+                options = options ? thisInterpreter.pseudoToNative(options) : undefined;
+                return Number(this).toLocaleString(locales, options);
+            };
+            this.setNativeFunctionPrototype(this.NUMBER, 'toLocaleString', wrapper);
+        };
+        ;
+        /**
+         * Initialize the Date class.
+         * @param {!Interpreter.MyObject} scope Global scope.
+         */
+        Interpreter.prototype.initDate = function (scope) {
+            var thisInterpreter = this;
+            var wrapper;
+            // Date constructor.
+            wrapper = function (value, var_args) {
+                if (!thisInterpreter.calledWithNew()) {
+                    // Called as Date().
+                    // Calling Date() as a function returns a string, no arguments are heeded.
+                    return Date();
+                }
+                // Called as new Date().
+                var args = [null].concat([].slice.call(arguments));
+                this.data = new (Function.prototype.bind.apply(Date, args));
+                return this;
+            };
+            this.DATE = this.createNativeFunction(wrapper, true);
+            this.setProperty(scope, 'Date', this.DATE);
+            // Static methods on Date.
+            this.setProperty(this.DATE, 'now', this.createNativeFunction(Date.now, false), Interpreter.NONENUMERABLE_DESCRIPTOR);
+            this.setProperty(this.DATE, 'parse', this.createNativeFunction(Date.parse, false), Interpreter.NONENUMERABLE_DESCRIPTOR);
+            this.setProperty(this.DATE, 'UTC', this.createNativeFunction(Date.UTC, false), Interpreter.NONENUMERABLE_DESCRIPTOR);
+            // Instance methods on Date.
+            var functions = ['getDate', 'getDay', 'getFullYear', 'getHours',
+                'getMilliseconds', 'getMinutes', 'getMonth', 'getSeconds', 'getTime',
+                'getTimezoneOffset', 'getUTCDate', 'getUTCDay', 'getUTCFullYear',
+                'getUTCHours', 'getUTCMilliseconds', 'getUTCMinutes', 'getUTCMonth',
+                'getUTCSeconds', 'getYear',
+                'setDate', 'setFullYear', 'setHours', 'setMilliseconds',
+                'setMinutes', 'setMonth', 'setSeconds', 'setTime', 'setUTCDate',
+                'setUTCFullYear', 'setUTCHours', 'setUTCMilliseconds', 'setUTCMinutes',
+                'setUTCMonth', 'setUTCSeconds', 'setYear',
+                'toDateString', 'toISOString', 'toJSON', 'toGMTString',
+                'toLocaleDateString', 'toLocaleString', 'toLocaleTimeString',
+                'toTimeString', 'toUTCString'];
+            for (var i = 0; i < functions.length; i++) {
+                wrapper = (function (nativeFunc) {
+                    return function (var_args) {
+                        var args = [];
+                        for (var i = 0; i < arguments.length; i++) {
+                            args[i] = thisInterpreter.pseudoToNative(arguments[i]);
+                        }
+                        return this.data[nativeFunc].apply(this.data, args);
+                    };
+                })(functions[i]);
+                this.setNativeFunctionPrototype(this.DATE, functions[i], wrapper);
+            }
+        };
+        ;
+        /**
+         * Initialize Regular Expression object.
+         * @param {!Interpreter.MyObject} scope Global scope.
+         */
+        Interpreter.prototype.initRegExp = function (scope) {
+            var thisInterpreter = this;
+            var wrapper;
+            // RegExp constructor.
+            wrapper = function (pattern, flags) {
+                if (thisInterpreter.calledWithNew()) {
+                    // Called as new RegExp().
+                    var rgx = this;
+                }
+                else {
+                    // Called as RegExp().
+                    var rgx = thisInterpreter.createObjectProto(thisInterpreter.REGEXP_PROTO);
+                }
+                pattern = pattern ? pattern.toString() : '';
+                flags = flags ? flags.toString() : '';
+                thisInterpreter.populateRegExp(rgx, new RegExp(pattern, flags));
+                return rgx;
+            };
+            this.REGEXP = this.createNativeFunction(wrapper, true);
+            this.REGEXP_PROTO = this.REGEXP.properties['prototype'];
+            this.setProperty(scope, 'RegExp', this.REGEXP);
+            this.setProperty(this.REGEXP.properties['prototype'], 'global', undefined, Interpreter.READONLY_NONENUMERABLE_DESCRIPTOR);
+            this.setProperty(this.REGEXP.properties['prototype'], 'ignoreCase', undefined, Interpreter.READONLY_NONENUMERABLE_DESCRIPTOR);
+            this.setProperty(this.REGEXP.properties['prototype'], 'multiline', undefined, Interpreter.READONLY_NONENUMERABLE_DESCRIPTOR);
+            this.setProperty(this.REGEXP.properties['prototype'], 'source', '(?:)', Interpreter.READONLY_NONENUMERABLE_DESCRIPTOR);
+            wrapper = function (str) {
+                return this.data.test(str);
+            };
+            this.setNativeFunctionPrototype(this.REGEXP, 'test', wrapper);
+            wrapper = function (str) {
+                str = str.toString();
+                // Get lastIndex from wrapped regex, since this is settable.
+                this.data.lastIndex =
+                    Number(thisInterpreter.getProperty(this, 'lastIndex'));
+                var match = this.data.exec(str);
+                thisInterpreter.setProperty(this, 'lastIndex', this.data.lastIndex);
+                if (match) {
+                    var result = thisInterpreter.createObjectProto(thisInterpreter.ARRAY_PROTO);
+                    for (var i = 0; i < match.length; i++) {
+                        thisInterpreter.setProperty(result, i, match[i]);
+                    }
+                    // match has additional properties.
+                    thisInterpreter.setProperty(result, 'index', match.index);
+                    thisInterpreter.setProperty(result, 'input', match.input);
+                    return result;
+                }
+                return null;
+            };
+            this.setNativeFunctionPrototype(this.REGEXP, 'exec', wrapper);
+        };
+        ;
+        /**
+         * Initialize the Error class.
+         * @param {!Interpreter.MyObject} scope Global scope.
+         */
+        Interpreter.prototype.initError = function (scope) {
+            var thisInterpreter = this;
+            // Error constructor.
+            this.ERROR = this.createNativeFunction(function (opt_message) {
+                if (thisInterpreter.calledWithNew()) {
+                    // Called as new Error().
+                    var newError = this;
+                }
+                else {
+                    // Called as Error().
+                    var newError = thisInterpreter.createObject(thisInterpreter.ERROR);
+                }
+                if (opt_message) {
+                    thisInterpreter.setProperty(newError, 'message', String(opt_message), Interpreter.NONENUMERABLE_DESCRIPTOR);
+                }
+                return newError;
+            }, true);
+            this.setProperty(scope, 'Error', this.ERROR);
+            this.setProperty(this.ERROR.properties['prototype'], 'message', '', Interpreter.NONENUMERABLE_DESCRIPTOR);
+            this.setProperty(this.ERROR.properties['prototype'], 'name', 'Error', Interpreter.NONENUMERABLE_DESCRIPTOR);
+            var createErrorSubclass = function (name) {
+                var constructor = thisInterpreter.createNativeFunction(function (opt_message) {
+                    if (thisInterpreter.calledWithNew()) {
+                        // Called as new XyzError().
+                        var newError = this;
+                    }
+                    else {
+                        // Called as XyzError().
+                        var newError = thisInterpreter.createObject(constructor);
+                    }
+                    if (opt_message) {
+                        thisInterpreter.setProperty(newError, 'message', String(opt_message), Interpreter.NONENUMERABLE_DESCRIPTOR);
+                    }
+                    return newError;
+                }, true);
+                thisInterpreter.setProperty(constructor, 'prototype', thisInterpreter.createObject(thisInterpreter.ERROR));
+                thisInterpreter.setProperty(constructor.properties['prototype'], 'name', name, Interpreter.NONENUMERABLE_DESCRIPTOR);
+                thisInterpreter.setProperty(scope, name, constructor);
+                return constructor;
+            };
+            this.EVAL_ERROR = createErrorSubclass('EvalError');
+            this.RANGE_ERROR = createErrorSubclass('RangeError');
+            this.REFERENCE_ERROR = createErrorSubclass('ReferenceError');
+            this.SYNTAX_ERROR = createErrorSubclass('SyntaxError');
+            this.TYPE_ERROR = createErrorSubclass('TypeError');
+            this.URI_ERROR = createErrorSubclass('URIError');
+        };
+        ;
+        /**
+         * Initialize Math object.
+         * @param {!Interpreter.MyObject} scope Global scope.
+         */
+        Interpreter.prototype.initMath = function (scope) {
+            var thisInterpreter = this;
+            var myMath = this.createObjectProto(this.OBJECT_PROTO);
+            this.setProperty(scope, 'Math', myMath);
+            var mathConsts = ['E', 'LN2', 'LN10', 'LOG2E', 'LOG10E', 'PI',
+                'SQRT1_2', 'SQRT2'];
+            for (var i = 0; i < mathConsts.length; i++) {
+                this.setProperty(myMath, mathConsts[i], Math[mathConsts[i]], Interpreter.READONLY_NONENUMERABLE_DESCRIPTOR);
+            }
+            var numFunctions = ['abs', 'acos', 'asin', 'atan', 'atan2', 'ceil', 'cos',
+                'exp', 'floor', 'log', 'max', 'min', 'pow', 'random',
+                'round', 'sin', 'sqrt', 'tan'];
+            for (var i = 0; i < numFunctions.length; i++) {
+                this.setProperty(myMath, numFunctions[i], this.createNativeFunction(Math[numFunctions[i]], false), Interpreter.NONENUMERABLE_DESCRIPTOR);
+            }
+        };
+        ;
+        /**
+         * Initialize JSON object.
+         * @param {!Interpreter.MyObject} scope Global scope.
+         */
+        Interpreter.prototype.initJSON = function (scope) {
+            var thisInterpreter = this;
+            var myJSON = thisInterpreter.createObjectProto(this.OBJECT_PROTO);
+            this.setProperty(scope, 'JSON', myJSON);
+            var wrapper = function (text) {
+                try {
+                    var nativeObj = JSON.parse(text.toString());
+                }
+                catch (e) {
+                    thisInterpreter.throwException(thisInterpreter.SYNTAX_ERROR, e.message);
+                }
+                return thisInterpreter.nativeToPseudo(nativeObj);
+            };
+            this.setProperty(myJSON, 'parse', this.createNativeFunction(wrapper, false));
+            wrapper = function (value) {
+                var nativeObj = thisInterpreter.pseudoToNative(value);
+                try {
+                    var str = JSON.stringify(nativeObj);
+                }
+                catch (e) {
+                    thisInterpreter.throwException(thisInterpreter.TYPE_ERROR, e.message);
+                }
+                return str;
+            };
+            this.setProperty(myJSON, 'stringify', this.createNativeFunction(wrapper, false));
+        };
+        ;
+        /**
+         * Is an object of a certain class?
+         * @param {Interpreter.MyValue} child Object to check.
+         * @param {Interpreter.MyObject} constructor Constructor of object.
+         * @return {boolean} True if object is the class or inherits from it.
+         *     False otherwise.
+         */
+        Interpreter.prototype.isa = function (child, constructor) {
+            if (child === null || child === undefined || !constructor) {
+                return false;
+            }
+            var proto = constructor.properties['prototype'];
+            if (child === proto) {
+                return true;
+            }
+            // The first step up the prototype chain is harder since the child might be
+            // a primitive value.  Subsequent steps can just follow the .proto property.
+            var childObj = this.getPrototype(child);
+            while (childObj) {
+                if (childObj === proto) {
+                    return true;
+                }
+                childObj = childObj.proto;
+            }
+            return false;
+        };
+        ;
+        /**
+         * Is a value a legal integer for an array length?
+         * @param {Interpreter.MyValue} x Value to check.
+         * @return {number} Zero, or a positive integer if the value can be
+         *     converted to such.  NaN otherwise.
+         */
+        Interpreter.legalArrayLength = function (x) {
+            var n = x >>> 0;
+            // Array length must be between 0 and 2^32-1 (inclusive).
+            return (n === Number(x)) ? n : NaN;
+        };
+        ;
+        /**
+         * Is a value a legal integer for an array index?
+         * @param {Interpreter.MyValue} x Value to check.
+         * @return {number} Zero, or a positive integer if the value can be
+         *     converted to such.  NaN otherwise.
+         */
+        Interpreter.legalArrayIndex = function (x) {
+            var n = x >>> 0;
+            // Array index cannot be 2^32-1, otherwise length would be 2^32.
+            // 0xffffffff is 2^32-1.
+            return (String(n) === String(x) && n !== 0xffffffff) ? n : NaN;
+        };
+        ;
+        /**
+         * Create a new data object based on a constructor's prototype.
+         * @param {Interpreter.MyObject} constructor Parent constructor function,
+         *     or null if scope object.
+         * @return {!Interpreter.MyObject} New data object.
+         */
+        Interpreter.prototype.createObject = function (constructor) {
+            return this.createObjectProto(constructor &&
+                constructor.properties['prototype']);
+        };
+        ;
+        /**
+         * Create a new data object based on a prototype.
+         * @param {Interpreter.MyObject} proto Prototype object.
+         * @return {!Interpreter.MyObject} New data object.
+         */
+        Interpreter.prototype.createObjectProto = function (proto) {
+            var obj = new Interpreter.MyObject(proto);
+            // Functions have prototype objects.
+            if (this.isa(obj, this.FUNCTION)) {
+                this.setProperty(obj, 'prototype', this.createObjectProto(this.OBJECT_PROTO || null));
+                obj.class = 'Function';
+            }
+            // Arrays have length.
+            if (this.isa(obj, this.ARRAY)) {
+                this.setProperty(obj, 'length', 0, { configurable: false, enumerable: false, writable: true });
+                obj.class = 'Array';
+            }
+            if (this.isa(obj, this.ERROR)) {
+                obj.class = 'Error';
+            }
+            return obj;
+        };
+        ;
+        /**
+         * Initialize a pseudo regular expression object based on a native regular
+         * expression object.
+         * @param {!Interpreter.MyObject} pseudoRegexp The existing object to set.
+         * @param {!RegExp} nativeRegexp The native regular expression.
+         */
+        Interpreter.prototype.populateRegExp = function (pseudoRegexp, nativeRegexp) {
+            pseudoRegexp.data = nativeRegexp;
+            // lastIndex is settable, all others are read-only attributes
+            this.setProperty(pseudoRegexp, 'lastIndex', nativeRegexp.lastIndex, Interpreter.NONENUMERABLE_DESCRIPTOR);
+            this.setProperty(pseudoRegexp, 'source', nativeRegexp.source, Interpreter.READONLY_NONENUMERABLE_DESCRIPTOR);
+            this.setProperty(pseudoRegexp, 'global', nativeRegexp.global, Interpreter.READONLY_NONENUMERABLE_DESCRIPTOR);
+            this.setProperty(pseudoRegexp, 'ignoreCase', nativeRegexp.ignoreCase, Interpreter.READONLY_NONENUMERABLE_DESCRIPTOR);
+            this.setProperty(pseudoRegexp, 'multiline', nativeRegexp.multiline, Interpreter.READONLY_NONENUMERABLE_DESCRIPTOR);
+        };
+        ;
+        /**
+         * Create a new function.
+         * @param {!Object} node AST node defining the function.
+         * @param {!Object} scope Parent scope.
+         * @return {!Interpreter.MyObject} New function.
+         */
+        Interpreter.prototype.createFunction = function (node, scope) {
+            var func = this.createObjectProto(this.FUNCTION_PROTO);
+            func.parentScope = scope;
+            func.node = node;
+            this.setProperty(func, 'length', func.node['params'].length, Interpreter.READONLY_DESCRIPTOR);
+            return func;
+        };
+        ;
+        /**
+         * Create a new native function.
+         * @param {!Function} nativeFunc JavaScript function.
+         * @param {boolean=} opt_constructor If true, the function's
+         * prototype will have its constructor property set to the function.
+         * If false, the function cannot be called as a constructor (e.g. escape).
+         * Defaults to undefined.
+         * @return {!Interpreter.MyObject} New function.
+         */
+        Interpreter.prototype.createNativeFunction = function (nativeFunc, opt_constructor) {
+            var func = this.createObjectProto(this.FUNCTION_PROTO);
+            func.nativeFunc = nativeFunc;
+            nativeFunc.id = this.functionCounter_++;
+            this.setProperty(func, 'length', nativeFunc.length, Interpreter.READONLY_DESCRIPTOR);
+            if (opt_constructor) {
+                this.setProperty(func.properties['prototype'], 'constructor', func, Interpreter.NONENUMERABLE_DESCRIPTOR);
+            }
+            else if (opt_constructor === false) {
+                func.illegalConstructor = true;
+                this.setProperty(func, 'prototype', undefined);
+            }
+            return func;
+        };
+        ;
+        /**
+         * Create a new native asynchronous function.
+         * @param {!Function} asyncFunc JavaScript function.
+         * @return {!Interpreter.MyObject} New function.
+         */
+        Interpreter.prototype.createAsyncFunction = function (asyncFunc) {
+            var func = this.createObjectProto(this.FUNCTION_PROTO);
+            func.asyncFunc = asyncFunc;
+            asyncFunc.id = this.functionCounter_++;
+            this.setProperty(func, 'length', asyncFunc.length, Interpreter.READONLY_DESCRIPTOR);
+            return func;
+        };
+        ;
+        /**
+         * Converts from a native JS object or value to a JS interpreter object.
+         * Can handle JSON-style values.
+         * @param {*} nativeObj The native JS object to be converted.
+         * @return {Interpreter.MyValue} The equivalent JS interpreter object.
+         */
+        Interpreter.prototype.nativeToPseudo = function (nativeObj) {
+            if (typeof nativeObj === 'boolean' ||
+                typeof nativeObj === 'number' ||
+                typeof nativeObj === 'string' ||
+                nativeObj === null || nativeObj === undefined) {
+                return nativeObj;
+            }
+            if (nativeObj instanceof RegExp) {
+                var pseudoRegexp = this.createObjectProto(this.REGEXP_PROTO);
+                this.populateRegExp(pseudoRegexp, nativeObj);
+                return pseudoRegexp;
+            }
+            if (nativeObj instanceof Function) {
+                var interpreter = this;
+                var wrapper = function () {
+                    return interpreter.nativeToPseudo(nativeObj.apply(interpreter, Array.prototype.slice.call(arguments)
+                        .map(function (i) {
+                        return interpreter.pseudoToNative(i);
+                    })));
+                };
+                return this.createNativeFunction(wrapper, undefined);
+            }
+            var pseudoObj;
+            if (Array.isArray(nativeObj)) {
+                pseudoObj = this.createObjectProto(this.ARRAY_PROTO);
+                for (var i = 0; i < nativeObj.length; i++) {
+                    if (i in nativeObj) {
+                        this.setProperty(pseudoObj, i, this.nativeToPseudo(nativeObj[i]));
+                    }
+                }
+            }
+            else {
+                pseudoObj = this.createObjectProto(this.OBJECT_PROTO);
+                for (var key in nativeObj) {
+                    this.setProperty(pseudoObj, key, this.nativeToPseudo(nativeObj[key]));
+                }
+            }
+            return pseudoObj;
+        };
+        ;
+        /**
+         * Converts from a JS interpreter object to native JS object.
+         * Can handle JSON-style values, plus cycles.
+         * @param {Interpreter.MyValue} pseudoObj The JS interpreter object to be
+         * converted.
+         * @param {Object=} opt_cycles Cycle detection (used in recursive calls).
+         * @return {*} The equivalent native JS object or value.
+         */
+        Interpreter.prototype.pseudoToNative = function (pseudoObj, opt_cycles) {
+            if (typeof pseudoObj === 'boolean' ||
+                typeof pseudoObj === 'number' ||
+                typeof pseudoObj === 'string' ||
+                pseudoObj === null || pseudoObj === undefined) {
+                return pseudoObj;
+            }
+            if (this.isa(pseudoObj, this.REGEXP)) {
+                return pseudoObj.data;
+            }
+            var cycles = opt_cycles || {
+                pseudo: [],
+                native: []
+            };
+            var i = cycles.pseudo.indexOf(pseudoObj);
+            if (i !== -1) {
+                return cycles.native[i];
+            }
+            cycles.pseudo.push(pseudoObj);
+            var nativeObj;
+            if (this.isa(pseudoObj, this.ARRAY)) {
+                nativeObj = [];
+                cycles.native.push(nativeObj);
+                var length = this.getProperty(pseudoObj, 'length');
+                for (var i = 0; i < length; i++) {
+                    if (this.hasProperty(pseudoObj, i)) {
+                        nativeObj[i] =
+                            this.pseudoToNative(this.getProperty(pseudoObj, i), cycles);
+                    }
+                }
+            }
+            else {
+                nativeObj = {};
+                cycles.native.push(nativeObj);
+                var val;
+                for (var key in pseudoObj.properties) {
+                    val = pseudoObj.properties[key];
+                    nativeObj[key] = this.pseudoToNative(val, cycles);
+                }
+            }
+            cycles.pseudo.pop();
+            cycles.native.pop();
+            return nativeObj;
+        };
+        ;
+        /**
+         * Look up the prototype for this value.
+         * @param {Interpreter.MyValue} value Data object.
+         * @return {Interpreter.MyObject} Prototype object, null if none.
+         */
+        Interpreter.prototype.getPrototype = function (value) {
+            switch (typeof value) {
+                case 'number':
+                    return this.NUMBER.properties['prototype'];
+                case 'boolean':
+                    return this.BOOLEAN.properties['prototype'];
+                case 'string':
+                    return this.STRING.properties['prototype'];
+            }
+            if (value) {
+                return value.proto;
+            }
+            return null;
+        };
+        ;
+        /**
+         * Fetch a property value from a data object.
+         * @param {Interpreter.MyValue} obj Data object.
+         * @param {Interpreter.MyValue} name Name of property.
+         * @return {Interpreter.MyValue} Property value (may be undefined).
+         */
+        Interpreter.prototype.getProperty = function (obj, name) {
+            name = String(name);
+            if (obj === undefined || obj === null) {
+                this.throwException(this.TYPE_ERROR, "Cannot read property '" + name + "' of " + obj);
+            }
+            if (name === 'length') {
+                // Special cases for magic length property.
+                if (this.isa(obj, this.STRING)) {
+                    return String(obj).length;
+                }
+            }
+            else if (name.charCodeAt(0) < 0x40) {
+                // Might have numbers in there?
+                // Special cases for string array indexing
+                if (this.isa(obj, this.STRING)) {
+                    var n = Interpreter.legalArrayIndex(name);
+                    if (!isNaN(n) && n < String(obj).length) {
+                        return String(obj)[n];
+                    }
+                }
+            }
+            do {
+                var myObj = obj;
+                if (myObj.properties && name in myObj.properties) {
+                    var getter = myObj.getter[name];
+                    if (getter) {
+                        // Flag this function as being a getter and thus needing immediate
+                        // execution (rather than being the value of the property).
+                        getter.isGetter = true;
+                        return getter;
+                    }
+                    return myObj.properties[name];
+                }
+            } while ((obj = this.getPrototype(obj)));
+            return undefined;
+        };
+        ;
+        /**
+         * Does the named property exist on a data object.
+         * @param {Interpreter.MyValue} obj Data object.
+         * @param {Interpreter.MyValue} name Name of property.
+         * @return {boolean} True if property exists.
+         */
+        Interpreter.prototype.hasProperty = function (obj, name) {
+            if (!obj['isObject']) {
+                throw TypeError('Primitive data type has no properties');
+            }
+            name = String(name);
+            if (name === 'length' && this.isa(obj, this.STRING)) {
+                return true;
+            }
+            if (this.isa(obj, this.STRING)) {
+                var n = Interpreter.legalArrayIndex(name);
+                if (!isNaN(n) && n < String(obj).length) {
+                    return true;
+                }
+            }
+            do {
+                var myObj = obj;
+                if (myObj.properties && name in myObj.properties) {
+                    return true;
+                }
+            } while ((obj = this.getPrototype(obj)));
+            return false;
+        };
+        ;
+        /**
+         * Set a property value on a data object.
+         * @param {!Interpreter.MyObject} obj Data object.
+         * @param {Interpreter.MyValue} name Name of property.
+         * @param {Interpreter.MyValue|ReferenceError} value New property value.
+         *   Use ReferenceError if value is handled by descriptor instead.
+         * @param {Object=} opt_descriptor Optional descriptor object.
+         * @return {!Interpreter.MyObject|undefined} Returns a setter function if one
+         *     needs to be called, otherwise undefined.
+         */
+        Interpreter.prototype.setProperty = function (obj, name, value, opt_descriptor) {
+            name = String(name);
+            if (obj === undefined || obj === null) {
+                this.throwException(this.TYPE_ERROR, "Cannot set property '" + name + "' of " + obj);
+            }
+            if (opt_descriptor && ('get' in opt_descriptor || 'set' in opt_descriptor) &&
+                ('value' in opt_descriptor || 'writable' in opt_descriptor)) {
+                this.throwException(this.TYPE_ERROR, 'Invalid property descriptor. ' +
+                    'Cannot both specify accessors and a value or writable attribute');
+            }
+            var strict = !this.stateStack || this.getScope().strict;
+            if (!obj.isObject) {
+                if (strict) {
+                    this.throwException(this.TYPE_ERROR, "Can't create property '" + name +
+                        "' on '" + obj + "'");
+                }
+                return;
+            }
+            if (this.isa(obj, this.STRING)) {
+                var n = Interpreter.legalArrayIndex(name);
+                if (name === 'length' || (!isNaN(n) && n < String(obj).length)) {
+                    // Can't set length or letters on String objects.
+                    if (strict) {
+                        this.throwException(this.TYPE_ERROR, "Cannot assign to read only " +
+                            "property '" + name + "' of String '" + obj.data + "'");
+                    }
+                    return;
+                }
+            }
+            if (obj.class === 'Array') {
+                // Arrays have a magic length variable that is bound to the elements.
+                var length = obj.properties.length;
+                var i;
+                if (name === 'length') {
+                    // Delete elements if length is smaller.
+                    value = Interpreter.legalArrayLength(value);
+                    if (isNaN(value)) {
+                        this.throwException(this.RANGE_ERROR, 'Invalid array length');
+                    }
+                    if (value < length) {
+                        for (i in obj.properties) {
+                            i = Interpreter.legalArrayIndex(i);
+                            if (!isNaN(i) && value <= i) {
+                                delete obj.properties[i];
+                            }
+                        }
+                    }
+                }
+                else if (!isNaN(i = Interpreter.legalArrayIndex(name))) {
+                    // Increase length if this index is larger.
+                    obj.properties.length = Math.max(length, i + 1);
+                }
+            }
+            if (obj.preventExtensions && !(name in obj.properties)) {
+                if (strict) {
+                    this.throwException(this.TYPE_ERROR, "Can't add property '" + name +
+                        "', object is not extensible");
+                }
+                return;
+            }
+            if (opt_descriptor) {
+                // Define the property.
+                if ('get' in opt_descriptor) {
+                    if (opt_descriptor.get) {
+                        obj.getter[name] = opt_descriptor.get;
+                    }
+                    else {
+                        delete obj.getter[name];
+                    }
+                }
+                if ('set' in opt_descriptor) {
+                    if (opt_descriptor.set) {
+                        obj.setter[name] = opt_descriptor.set;
+                    }
+                    else {
+                        delete obj.setter[name];
+                    }
+                }
+                var descriptor = {};
+                if ('configurable' in opt_descriptor) {
+                    descriptor.configurable = opt_descriptor.configurable;
+                }
+                if ('enumerable' in opt_descriptor) {
+                    descriptor.enumerable = opt_descriptor.enumerable;
+                }
+                if ('writable' in opt_descriptor) {
+                    descriptor.writable = opt_descriptor.writable;
+                    delete obj.getter[name];
+                    delete obj.setter[name];
+                }
+                if ('value' in opt_descriptor) {
+                    descriptor.value = opt_descriptor.value;
+                    delete obj.getter[name];
+                    delete obj.setter[name];
+                }
+                else if (value !== ReferenceError) {
+                    descriptor.value = value;
+                    delete obj.getter[name];
+                    delete obj.setter[name];
+                }
+                try {
+                    Object.defineProperty(obj.properties, name, descriptor);
+                }
+                catch (e) {
+                    this.throwException(this.TYPE_ERROR, 'Cannot redefine property: ' + name);
+                }
+            }
+            else {
+                // Set the property.
+                if (value === ReferenceError) {
+                    throw ReferenceError('Value not specified.');
+                }
+                // Determine the parent (possibly self) where the property is defined.
+                var defObj = obj;
+                while (!(name in defObj.properties)) {
+                    defObj = this.getPrototype(defObj);
+                    if (!defObj) {
+                        // This is a new property.
+                        defObj = obj;
+                        break;
+                    }
+                }
+                if (defObj.setter && defObj.setter[name]) {
+                    return defObj.setter[name];
+                }
+                if (defObj.getter && defObj.getter[name]) {
+                    if (strict) {
+                        this.throwException(this.TYPE_ERROR, "Cannot set property '" + name +
+                            "' of object '" + obj + "' which only has a getter");
+                    }
+                }
+                else {
+                    // No setter, simple assignment.
+                    try {
+                        obj.properties[name] = value;
+                    }
+                    catch (e) {
+                        if (strict) {
+                            this.throwException(this.TYPE_ERROR, "Cannot assign to read only " +
+                                "property '" + name + "' of object '" + obj + "'");
+                        }
+                    }
+                }
+            }
+        };
+        ;
+        /**
+         * Convenience method for adding a native function as a non-enumerable property
+         * onto an object's prototype.
+         * @param {!Interpreter.MyObject} obj Data object.
+         * @param {Interpreter.MyValue} name Name of property.
+         * @param {!Function} wrapper Function object.
+         */
+        Interpreter.prototype.setNativeFunctionPrototype = function (obj, name, wrapper) {
+            this.setProperty(obj.properties['prototype'], name, this.createNativeFunction(wrapper, false), Interpreter.NONENUMERABLE_DESCRIPTOR);
+        };
+        ;
+        /**
+         * Returns the current scope from the stateStack.
+         * @return {!Interpreter.MyObject} Current scope dictionary.
+         */
+        Interpreter.prototype.getScope = function () {
+            var scope = this.stateStack[this.stateStack.length - 1].scope;
+            if (!scope) {
+                throw Error('No scope found.');
+            }
+            return scope;
+        };
+        ;
+        /**
+         * Create a new scope dictionary.
+         * @param {!Object} node AST node defining the scope container
+         *     (e.g. a function).
+         * @param {Interpreter.MyObject} parentScope Scope to link to.
+         * @return {!Interpreter.MyObject} New scope.
+         */
+        Interpreter.prototype.createScope = function (node, parentScope) {
+            var scope = this.createObjectProto(null);
+            scope.parentScope = parentScope;
+            if (!parentScope) {
+                this.initGlobalScope(scope);
+            }
+            this.populateScope_(node, scope);
+            // Determine if this scope starts with 'use strict'.
+            scope.strict = false;
+            if (parentScope && parentScope.strict) {
+                scope.strict = true;
+            }
+            else {
+                var firstNode = node['body'] && node['body'][0];
+                if (firstNode && firstNode.expression &&
+                    firstNode.expression['type'] === 'Literal' &&
+                    firstNode.expression.value === 'use strict') {
+                    scope.strict = true;
+                }
+            }
+            return scope;
+        };
+        ;
+        /**
+         * Create a new special scope dictionary. Similar to createScope(), but
+         * doesn't assume that the scope is for a function body.
+         * This is used for 'catch' clauses and 'with' statements.
+         * @param {!Interpreter.MyObject} parentScope Scope to link to.
+         * @param {Interpreter.MyObject=} opt_scope Optional object to transform into
+         *     scope.
+         * @return {!Interpreter.MyObject} New scope.
+         */
+        Interpreter.prototype.createSpecialScope = function (parentScope, opt_scope) {
+            if (!parentScope) {
+                throw Error('parentScope required');
+            }
+            var scope = opt_scope || this.createObjectProto(null);
+            scope.parentScope = parentScope;
+            scope.strict = parentScope.strict;
+            return scope;
+        };
+        ;
+        /**
+         * Retrieves a value from the scope chain.
+         * @param {string} name Name of variable.
+         * @return {Interpreter.MyValue} Any value.
+         *   May be flagged as being a getter and thus needing immediate execution
+         *   (rather than being the value of the property).
+         */
+        Interpreter.prototype.getValueFromScope = function (name) {
+            var scope = this.getScope();
+            while (scope && scope !== this.global) {
+                if (name in scope.properties) {
+                    return scope.properties[name];
+                }
+                scope = scope.parentScope;
+            }
+            // The root scope is also an object which has inherited properties and
+            // could also have getters.
+            if (scope === this.global && this.hasProperty(scope, name)) {
+                return this.getProperty(scope, name);
+            }
+            // Typeof operator is unique: it can safely look at non-defined variables.
+            var prevNode = this.stateStack[this.stateStack.length - 1].node;
+            if (prevNode['type'] === 'UnaryExpression' &&
+                prevNode['operator'] === 'typeof') {
+                return undefined;
+            }
+            this.throwException(this.REFERENCE_ERROR, name + ' is not defined');
+        };
+        ;
+        /**
+         * Sets a value to the current scope.
+         * @param {string} name Name of variable.
+         * @param {Interpreter.MyValue} value Value.
+         * @return {!Interpreter.MyObject|undefined} Returns a setter function if one
+         *     needs to be called, otherwise undefined.
+         */
+        Interpreter.prototype.setValueToScope = function (name, value) {
+            var scope = this.getScope();
+            var strict = scope.strict;
+            while (scope && scope !== this.global) {
+                if (name in scope.properties) {
+                    scope.properties[name] = value;
+                    return undefined;
+                }
+                scope = scope.parentScope;
+            }
+            // The root scope is also an object which has readonly properties and
+            // could also have setters.
+            if (scope === this.global && (!strict || this.hasProperty(scope, name))) {
+                return this.setProperty(scope, name, value);
+            }
+            this.throwException(this.REFERENCE_ERROR, name + ' is not defined');
+        };
+        ;
+        /**
+         * Create a new scope for the given node.
+         * @param {!Object} node AST node (program or function).
+         * @param {!Interpreter.MyObject} scope Scope dictionary to populate.
+         * @private
+         */
+        Interpreter.prototype.populateScope_ = function (node, scope) {
+            if (node['type'] === 'VariableDeclaration') {
+                for (var i = 0; i < node['declarations'].length; i++) {
+                    this.setProperty(scope, node['declarations'][i]['id']['name'], undefined, Interpreter.VARIABLE_DESCRIPTOR);
+                }
+            }
+            else if (node['type'] === 'FunctionDeclaration') {
+                this.setProperty(scope, node['id']['name'], this.createFunction(node, scope), Interpreter.VARIABLE_DESCRIPTOR);
+                return; // Do not recurse into function.
+            }
+            else if (node['type'] === 'FunctionExpression') {
+                return; // Do not recurse into function.
+            }
+            else if (node['type'] === 'ExpressionStatement') {
+                return; // Expressions can't contain variable/function declarations.
+            }
+            var nodeClass = node['constructor'];
+            for (var name in node) {
+                var prop = node[name];
+                if (prop && typeof prop === 'object') {
+                    if (Array.isArray(prop)) {
+                        for (var i = 0; i < prop.length; i++) {
+                            if (prop[i] && prop[i].constructor === nodeClass) {
+                                this.populateScope_(prop[i], scope);
+                            }
+                        }
+                    }
+                    else {
+                        if (prop.constructor === nodeClass) {
+                            this.populateScope_(prop, scope);
+                        }
+                    }
+                }
+            }
+        };
+        ;
+        /**
+         * Remove start and end values from AST, or set start and end values to a
+         * constant value.  Used to remove highlighting from polyfills and to set
+         * highlighting in an eval to cover the entire eval expression.
+         * @param {!Object} node AST node.
+         * @param {number=} start Starting character of all nodes, or undefined.
+         * @param {number=} end Ending character of all nodes, or undefined.
+         * @private
+         */
+        Interpreter.prototype.stripLocations_ = function (node, start, end) {
+            if (start) {
+                node['start'] = start;
+            }
+            else {
+                delete node['start'];
+            }
+            if (end) {
+                node['end'] = end;
+            }
+            else {
+                delete node['end'];
+            }
+            for (var name in node) {
+                if (node.hasOwnProperty(name)) {
+                    var prop = node[name];
+                    if (prop && typeof prop === 'object') {
+                        this.stripLocations_(prop, start, end);
+                    }
+                }
+            }
+        };
+        ;
+        /**
+         * Is the current state directly being called with as a construction with 'new'.
+         * @return {boolean} True if 'new foo()', false if 'foo()'.
+         */
+        Interpreter.prototype.calledWithNew = function () {
+            return this.stateStack[this.stateStack.length - 1].isConstructor;
+        };
+        ;
+        /**
+         * Gets a value from the scope chain or from an object property.
+         * @param {!Array} ref Name of variable or object/propname tuple.
+         * @return {Interpreter.MyValue} Any value.
+         *   May be flagged as being a getter and thus needing immediate execution
+         *   (rather than being the value of the property).
+         */
+        Interpreter.prototype.getValue = function (ref) {
+            if (ref[0] === Interpreter.SCOPE_REFERENCE) {
+                // A null/varname variable lookup.
+                return this.getValueFromScope(ref[1]);
+            }
+            else {
+                // An obj/prop components tuple (foo.bar).
+                return this.getProperty(ref[0], ref[1]);
+            }
+        };
+        ;
+        /**
+         * Sets a value to the scope chain or to an object property.
+         * @param {!Array} ref Name of variable or object/propname tuple.
+         * @param {Interpreter.MyValue} value Value.
+         * @return {!Interpreter.MyObject|undefined} Returns a setter function if one
+         *     needs to be called, otherwise undefined.
+         */
+        Interpreter.prototype.setValue = function (ref, value) {
+            if (ref[0] === Interpreter.SCOPE_REFERENCE) {
+                // A null/varname variable lookup.
+                return this.setValueToScope(ref[1], value);
+            }
+            else {
+                // An obj/prop components tuple (foo.bar).
+                return this.setProperty(ref[0], ref[1], value);
+            }
+        };
+        ;
+        /**
+         * Throw an exception in the interpreter that can be handled by an
+         * interpreter try/catch statement.  If unhandled, a real exception will
+         * be thrown.  Can be called with either an error class and a message, or
+         * with an actual object to be thrown.
+         * @param {!Interpreter.MyObject} errorClass Type of error (if message is
+         *   provided) or the value to throw (if no message).
+         * @param {string=} opt_message Message being thrown.
+         */
+        Interpreter.prototype.throwException = function (errorClass, opt_message) {
+            if (opt_message === undefined) {
+                var error = errorClass; // This is a value to throw, not an error class.
+            }
+            else {
+                var error = this.createObject(errorClass);
+                this.setProperty(error, 'message', opt_message, Interpreter.NONENUMERABLE_DESCRIPTOR);
+            }
+            this.executeException(error);
+            // Abort anything related to the current step.
+            throw Interpreter.STEP_ERROR;
+        };
+        ;
+        /**
+         * Throw an exception in the interpreter that can be handled by a
+         * interpreter try/catch statement.  If unhandled, a real exception will
+         * be thrown.
+         * @param {!Interpreter.MyObject} error Error object to execute.
+         */
+        Interpreter.prototype.executeException = function (error) {
+            // Search for a try statement.
+            var stateStack = this.stateStack.slice();
+            do {
+                this.stateStack.pop();
+                var state = this.stateStack[this.stateStack.length - 1];
+                if (state.node['type'] === 'TryStatement') {
+                    state.throwValue = error;
+                    return;
+                }
+            } while (state && state.node['type'] !== 'Program');
+            // Throw a real error.
+            var realError;
+            if (this.isa(error, this.ERROR)) {
+                var errorTable = {
+                    'EvalError': EvalError,
+                    'RangeError': RangeError,
+                    'ReferenceError': ReferenceError,
+                    'SyntaxError': SyntaxError,
+                    'TypeError': TypeError,
+                    'URIError': URIError
+                };
+                var name = this.getProperty(error, 'name').toString();
+                var message = this.getProperty(error, 'message').valueOf();
+                var type = errorTable[name] || Error;
+                realError = type(message);
+            }
+            else {
+                realError = String(error);
+            }
+            this.stateStack = stateStack; // recover the original state stack
+            throw realError;
+        };
+        ;
+        /**
+         * Create a call to a getter function.
+         * @param {!Interpreter.MyObject} func Function to execute.
+         * @param {!Interpreter.MyObject|!Array} left
+         *     Name of variable or object/propname tuple.
+         * @private
+         */
+        Interpreter.prototype.createGetter_ = function (func, left) {
+            // Normally 'this' will be specified as the object component (o.x).
+            // Sometimes 'this' is explicitly provided (o).
+            var funcThis = Array.isArray(left) ? left[0] : left;
+            var node = new this.nodeConstructor();
+            node['type'] = 'CallExpression';
+            var state = new Interpreter.MyState(node, this.stateStack[this.stateStack.length - 1].scope);
+            state.doneCallee_ = true;
+            state.funcThis_ = funcThis;
+            state.func_ = func;
+            state.doneArgs_ = true;
+            state.arguments_ = [];
+            return state;
+        };
+        ;
+        /**
+         * Create a call to a setter function.
+         * @param {!Interpreter.MyObject} func Function to execute.
+         * @param {!Interpreter.MyObject|!Array} left
+         *     Name of variable or object/propname tuple.
+         * @param {Interpreter.MyValue} value Value to set.
+         * @private
+         */
+        Interpreter.prototype.createSetter_ = function (func, left, value) {
+            // Normally 'this' will be specified as the object component (o.x).
+            // Sometimes 'this' is implicitly the global object (x).
+            var funcThis = Array.isArray(left) ? left[0] : this.global;
+            var node = new this.nodeConstructor();
+            node['type'] = 'CallExpression';
+            var state = new Interpreter.MyState(node, this.stateStack[this.stateStack.length - 1].scope);
+            state.doneCallee_ = true;
+            state.funcThis_ = funcThis;
+            state.func_ = func;
+            state.doneArgs_ = true;
+            state.arguments_ = [value];
+            return state;
+        };
+        ;
+        ///////////////////////////////////////////////////////////////////////////////
+        // Functions to handle each node type.
+        ///////////////////////////////////////////////////////////////////////////////
+        Interpreter.prototype.stepArrayExpression = function (stack, state, node) {
+            var elements = node['elements'];
+            var n = state.n_ || 0;
+            if (!state.array_) {
+                state.array_ = this.createObjectProto(this.ARRAY_PROTO);
+                state.array_.properties.length = elements.length;
+            }
+            else {
+                this.setProperty(state.array_, n, state.value);
+                n++;
+            }
+            while (n < elements.length) {
+                // Skip missing elements - they're not defined, not undefined.
+                if (elements[n]) {
+                    state.n_ = n;
+                    return new Interpreter.MyState(elements[n], state.scope);
+                }
+                n++;
+            }
+            stack.pop();
+            stack[stack.length - 1].value = state.array_;
+        };
+        ;
+        Interpreter.prototype.stepAssignmentExpression = function (stack, state, node) {
+            if (!state.doneLeft_) {
+                state.doneLeft_ = true;
+                var nextState = new Interpreter.MyState(node['left'], state.scope);
+                nextState.components = true;
+                return nextState;
+            }
+            if (!state.doneRight_) {
+                if (!state.leftReference_) {
+                    state.leftReference_ = state.value;
+                }
+                if (state.doneGetter_) {
+                    state.leftValue_ = state.value;
+                }
+                if (!state.doneGetter_ && node['operator'] !== '=') {
+                    var leftValue = this.getValue(state.leftReference_);
+                    state.leftValue_ = leftValue;
+                    if (leftValue && typeof leftValue === 'object' && leftValue.isGetter) {
+                        // Clear the getter flag and call the getter function.
+                        leftValue.isGetter = false;
+                        state.doneGetter_ = true;
+                        var func = (leftValue);
+                        return this.createGetter_(func, state.leftReference_);
+                    }
+                }
+                state.doneRight_ = true;
+                return new Interpreter.MyState(node['right'], state.scope);
+            }
+            if (state.doneSetter_) {
+                // Return if setter function.
+                // Setter method on property has completed.
+                // Ignore its return value, and use the original set value instead.
+                stack.pop();
+                stack[stack.length - 1].value = state.doneSetter_;
+                return;
+            }
+            var value = state.leftValue_;
+            var rightValue = state.value;
+            switch (node['operator']) {
+                case '=':
+                    value = rightValue;
+                    break;
+                case '+=':
+                    value += rightValue;
+                    break;
+                case '-=':
+                    value -= rightValue;
+                    break;
+                case '*=':
+                    value *= rightValue;
+                    break;
+                case '/=':
+                    value /= rightValue;
+                    break;
+                case '%=':
+                    value %= rightValue;
+                    break;
+                case '<<=':
+                    value <<= rightValue;
+                    break;
+                case '>>=':
+                    value >>= rightValue;
+                    break;
+                case '>>>=':
+                    value >>>= rightValue;
+                    break;
+                case '&=':
+                    value &= rightValue;
+                    break;
+                case '^=':
+                    value ^= rightValue;
+                    break;
+                case '|=':
+                    value |= rightValue;
+                    break;
+                default:
+                    throw SyntaxError('Unknown assignment expression: ' + node['operator']);
+            }
+            var setter = this.setValue(state.leftReference_, value);
+            if (setter) {
+                state.doneSetter_ = value;
+                return this.createSetter_(setter, state.leftReference_, value);
+            }
+            // Return if no setter function.
+            stack.pop();
+            stack[stack.length - 1].value = value;
+        };
+        ;
+        Interpreter.prototype.stepBinaryExpression = function (stack, state, node) {
+            if (!state.doneLeft_) {
+                state.doneLeft_ = true;
+                return new Interpreter.MyState(node['left'], state.scope);
+            }
+            if (!state.doneRight_) {
+                state.doneRight_ = true;
+                state.leftValue_ = state.value;
+                return new Interpreter.MyState(node['right'], state.scope);
+            }
+            stack.pop();
+            var leftValue = state.leftValue_;
+            var rightValue = state.value;
+            var value;
+            switch (node['operator']) {
+                case '==':
+                    value = leftValue == rightValue;
+                    break;
+                case '!=':
+                    value = leftValue != rightValue;
+                    break;
+                case '===':
+                    value = leftValue === rightValue;
+                    break;
+                case '!==':
+                    value = leftValue !== rightValue;
+                    break;
+                case '>':
+                    value = leftValue > rightValue;
+                    break;
+                case '>=':
+                    value = leftValue >= rightValue;
+                    break;
+                case '<':
+                    value = leftValue < rightValue;
+                    break;
+                case '<=':
+                    value = leftValue <= rightValue;
+                    break;
+                case '+':
+                    value = leftValue + rightValue;
+                    break;
+                case '-':
+                    value = leftValue - rightValue;
+                    break;
+                case '*':
+                    value = leftValue * rightValue;
+                    break;
+                case '/':
+                    value = leftValue / rightValue;
+                    break;
+                case '%':
+                    value = leftValue % rightValue;
+                    break;
+                case '&':
+                    value = leftValue & rightValue;
+                    break;
+                case '|':
+                    value = leftValue | rightValue;
+                    break;
+                case '^':
+                    value = leftValue ^ rightValue;
+                    break;
+                case '<<':
+                    value = leftValue << rightValue;
+                    break;
+                case '>>':
+                    value = leftValue >> rightValue;
+                    break;
+                case '>>>':
+                    value = leftValue >>> rightValue;
+                    break;
+                case 'in':
+                    if (!rightValue || !rightValue.isObject) {
+                        this.throwException(this.TYPE_ERROR, "'in' expects an object, not '" + rightValue + "'");
+                    }
+                    value = this.hasProperty(rightValue, leftValue);
+                    break;
+                case 'instanceof':
+                    if (!this.isa(rightValue, this.FUNCTION)) {
+                        this.throwException(this.TYPE_ERROR, 'Right-hand side of instanceof is not an object');
+                    }
+                    value = leftValue.isObject ? this.isa(leftValue, rightValue) : false;
+                    break;
+                default:
+                    throw SyntaxError('Unknown binary operator: ' + node['operator']);
+            }
+            stack[stack.length - 1].value = value;
+        };
+        ;
+        Interpreter.prototype.stepBlockStatement = function (stack, state, node) {
+            var n = state.n_ || 0;
+            var expression = node['body'][n];
+            if (expression) {
+                state.n_ = n + 1;
+                return new Interpreter.MyState(expression, state.scope);
+            }
+            stack.pop();
+        };
+        ;
+        Interpreter.prototype.stepBreakStatement = function (stack, state, node) {
+            stack.pop();
+            var label = null;
+            if (node['label']) {
+                label = node['label']['name'];
+            }
+            while (state &&
+                state.node['type'] !== 'CallExpression' &&
+                state.node['type'] !== 'NewExpression') {
+                if (label) {
+                    if (state.labels && state.labels.indexOf(label) !== -1) {
+                        return;
+                    }
+                }
+                else if (state.isLoop || state.isSwitch) {
+                    return;
+                }
+                state = stack.pop();
+            }
+            // Syntax error, do not allow this error to be trapped.
+            throw SyntaxError('Illegal break statement');
+        };
+        ;
+        Interpreter.prototype.stepCallExpression = function (stack, state, node) {
+            if (!state.doneCallee_) {
+                state.doneCallee_ = 1;
+                // Components needed to determine value of 'this'.
+                var nextState = new Interpreter.MyState(node['callee'], state.scope);
+                nextState.components = true;
+                return nextState;
+            }
+            if (state.doneCallee_ === 1) {
+                // Determine value of the function.
+                state.doneCallee_ = 2;
+                var func = state.value;
+                if (Array.isArray(func)) {
+                    state.func_ = this.getValue(func);
+                    if (func[0] !== Interpreter.SCOPE_REFERENCE) {
+                        // Method function, 'this' is object (ignored if invoked as 'new').
+                        state.funcThis_ = func[0];
+                    }
+                    func = state.func_;
+                    if (func && typeof func === 'object' && func.isGetter) {
+                        // Clear the getter flag and call the getter function.
+                        func.isGetter = false;
+                        state.doneCallee_ = 1;
+                        return this.createGetter_(/** @type {!Interpreter.Object} */ (func), state.value);
+                    }
+                }
+                else {
+                    // Already evaluated function: (function(){...})();
+                    state.func_ = func;
+                }
+                state.arguments_ = [];
+                state.n_ = 0;
+            }
+            var func = state.func_;
+            if (!state.doneArgs_) {
+                if (state.n_ !== 0) {
+                    state.arguments_.push(state.value);
+                }
+                if (node['arguments'][state.n_]) {
+                    return new Interpreter.MyState(node['arguments'][state.n_++], state.scope);
+                }
+                // Determine value of 'this' in function.
+                if (node['type'] === 'NewExpression') {
+                    if (func.illegalConstructor) {
+                        // Illegal: new escape();
+                        this.throwException(this.TYPE_ERROR, func + ' is not a constructor');
+                    }
+                    // Constructor, 'this' is new object.
+                    state.funcThis_ = this.createObject(func);
+                    state.isConstructor = true;
+                }
+                else if (state.funcThis_ === undefined) {
+                    // Global function, 'this' is global object (or 'undefined' if strict).
+                    state.funcThis_ = state.scope.strict ? undefined : this.global;
+                }
+                state.doneArgs_ = true;
+            }
+            if (!state.doneExec_) {
+                state.doneExec_ = true;
+                if (!func || !func.isObject) {
+                    this.throwException(this.TYPE_ERROR, func + ' is not a function');
+                }
+                var funcNode = func.node;
+                if (funcNode) {
+                    var scope = this.createScope(funcNode['body'], func.parentScope);
+                    // Add all arguments.
+                    for (var i = 0; i < funcNode['params'].length; i++) {
+                        var paramName = funcNode['params'][i]['name'];
+                        var paramValue = state.arguments_.length > i ? state.arguments_[i] :
+                            undefined;
+                        this.setProperty(scope, paramName, paramValue);
+                    }
+                    // Build arguments variable.
+                    var argsList = this.createObjectProto(this.ARRAY_PROTO);
+                    for (var i = 0; i < state.arguments_.length; i++) {
+                        this.setProperty(argsList, i, state.arguments_[i]);
+                    }
+                    this.setProperty(scope, 'arguments', argsList);
+                    // Add the function's name (var x = function foo(){};)
+                    var name = funcNode['id'] && funcNode['id']['name'];
+                    if (name) {
+                        this.setProperty(scope, name, func);
+                    }
+                    this.setProperty(scope, 'this', state.funcThis_, Interpreter.READONLY_DESCRIPTOR);
+                    state.value = undefined; // Default value if no explicit return.
+                    return new Interpreter.MyState(funcNode['body'], scope);
+                }
+                else if (func.eval) {
+                    var code = state.arguments_[0];
+                    if (typeof code !== 'string') {
+                        // JS does not parse String objects:
+                        // eval(new String('1 + 1')) -> '1 + 1'
+                        state.value = code;
+                    }
+                    else {
+                        try {
+                            var ast = Interpreter.acorn.parse(code.toString(), Interpreter.PARSE_OPTIONS);
+                        }
+                        catch (e) {
+                            // Acorn threw a SyntaxError.  Rethrow as a trappable error.
+                            this.throwException(this.SYNTAX_ERROR, 'Invalid code: ' + e.message);
+                        }
+                        var evalNode = new this.nodeConstructor();
+                        evalNode['type'] = 'EvalProgram_';
+                        evalNode['body'] = ast['body'];
+                        this.stripLocations_(evalNode, node['start'], node['end']);
+                        // Update current scope with definitions in eval().
+                        var scope = state.scope;
+                        if (scope.strict) {
+                            // Strict mode get its own scope in eval.
+                            scope = this.createScope(ast, scope);
+                        }
+                        else {
+                            // Non-strict mode pollutes the current scope.
+                            this.populateScope_(ast, scope);
+                        }
+                        this.value = undefined; // Default value if no code.
+                        return new Interpreter.MyState(evalNode, scope);
+                    }
+                }
+                else if (func.nativeFunc) {
+                    state.value = func.nativeFunc.apply(state.funcThis_, state.arguments_);
+                }
+                else if (func.asyncFunc) {
+                    var thisInterpreter = this;
+                    var callback = function (value) {
+                        state.value = value;
+                        thisInterpreter.paused_ = false;
+                    };
+                    var argsWithCallback = state.arguments_.concat(callback);
+                    this.paused_ = true;
+                    func.asyncFunc.apply(state.funcThis_, argsWithCallback);
+                    return;
+                }
+                else {
+                    /* A child of a function is a function but is not callable.  For example:
+                    var F = function() {};
+                    F.prototype = escape;
+                    var f = new F();
+                    f();
+                    */
+                    this.throwException(this.TYPE_ERROR, func.class + ' is not a function');
+                }
+            }
+            else {
+                // Execution complete.  Put the return value on the stack.
+                stack.pop();
+                if (state.isConstructor && typeof state.value !== 'object') {
+                    stack[stack.length - 1].value = state.funcThis_;
+                }
+                else {
+                    stack[stack.length - 1].value = state.value;
+                }
+            }
+        };
+        ;
+        Interpreter.prototype.stepCatchClause = function (stack, state, node) {
+            if (!state.done_) {
+                state.done_ = true;
+                // Create an empty scope.
+                var scope = this.createSpecialScope(state.scope);
+                // Add the argument.
+                this.setProperty(scope, node['param']['name'], state.throwValue);
+                // Execute catch clause.
+                return new Interpreter.MyState(node['body'], scope);
+            }
+            else {
+                stack.pop();
+            }
+        };
+        ;
+        Interpreter.prototype.stepConditionalExpression = function (stack, state, node) {
+            var mode = state.mode_ || 0;
+            if (mode === 0) {
+                state.mode_ = 1;
+                return new Interpreter.MyState(node['test'], state.scope);
+            }
+            if (mode === 1) {
+                state.mode_ = 2;
+                var value = Boolean(state.value);
+                if (value && node['consequent']) {
+                    // Execute 'if' block.
+                    return new Interpreter.MyState(node['consequent'], state.scope);
+                }
+                else if (!value && node['alternate']) {
+                    // Execute 'else' block.
+                    return new Interpreter.MyState(node['alternate'], state.scope);
+                }
+                // eval('1;if(false){2}') -> undefined
+                this.value = undefined;
+            }
+            stack.pop();
+            if (node['type'] === 'ConditionalExpression') {
+                stack[stack.length - 1].value = state.value;
+            }
+        };
+        ;
+        Interpreter.prototype.stepContinueStatement = function (stack, state, node) {
+            stack.pop();
+            var label = null;
+            if (node['label']) {
+                label = node['label']['name'];
+            }
+            state = stack[stack.length - 1];
+            while (state &&
+                state.node['type'] !== 'CallExpression' &&
+                state.node['type'] !== 'NewExpression') {
+                if (state.isLoop) {
+                    if (!label || (state.labels && state.labels.indexOf(label) !== -1)) {
+                        return;
+                    }
+                }
+                stack.pop();
+                state = stack[stack.length - 1];
+            }
+            // Syntax error, do not allow this error to be trapped.
+            throw SyntaxError('Illegal continue statement');
+        };
+        ;
+        Interpreter.prototype.stepDebuggerStatement = function (stack, state, node) {
+            // Do nothing.  May be overridden by developers.
+            stack.pop();
+        };
+        ;
+        Interpreter.prototype.stepDoWhileStatement = function (stack, state, node) {
+            if (node['type'] === 'DoWhileStatement' && state.test_ === undefined) {
+                // First iteration of do/while executes without checking test.
+                state.value = true;
+                state.test_ = true;
+            }
+            if (!state.test_) {
+                state.test_ = true;
+                return new Interpreter.MyState(node['test'], state.scope);
+            }
+            if (!state.value) {
+                stack.pop();
+            }
+            else if (node['body']) {
+                state.test_ = false;
+                state.isLoop = true;
+                return new Interpreter.MyState(node['body'], state.scope);
+            }
+        };
+        ;
+        Interpreter.prototype.stepEmptyStatement = function (stack, state, node) {
+            stack.pop();
+        };
+        ;
+        Interpreter.prototype.stepEvalProgram_ = function (stack, state, node) {
+            var n = state.n_ || 0;
+            var expression = node['body'][n];
+            if (expression) {
+                state.n_ = n + 1;
+                return new Interpreter.MyState(expression, state.scope);
+            }
+            stack.pop();
+            stack[stack.length - 1].value = this.value;
+        };
+        ;
+        Interpreter.prototype.stepExpressionStatement = function (stack, state, node) {
+            if (!state.done_) {
+                state.done_ = true;
+                return new Interpreter.MyState(node['expression'], state.scope);
+            }
+            stack.pop();
+            // Save this value to interpreter.value for use as a return value if
+            // this code is inside an eval function.
+            this.value = state.value;
+        };
+        ;
+        Interpreter.prototype.stepForInStatement = function (stack, state, node) {
+            // First, initialize a variable if exists.  Only do so once, ever.
+            if (!state.doneInit_) {
+                state.doneInit_ = true;
+                if (node['left']['declarations'] &&
+                    node['left']['declarations'][0]['init']) {
+                    if (state.scope.strict) {
+                        this.throwException(this.SYNTAX_ERROR, 'for-in loop variable declaration may not have an initializer.');
+                    }
+                    // Variable initialization: for (var x = 4 in y)
+                    return new Interpreter.MyState(node['left'], state.scope);
+                }
+            }
+            // Second, look up the object.  Only do so once, ever.
+            if (!state.doneObject_) {
+                state.doneObject_ = true;
+                if (!state.variable_) {
+                    state.variable_ = state.value;
+                }
+                return new Interpreter.MyState(node['right'], state.scope);
+            }
+            if (!state.isLoop) {
+                // First iteration.
+                state.isLoop = true;
+                state.object_ = state.value;
+                state.visited_ = Object.create(null);
+            }
+            // Third, find the property name for this iteration.
+            if (state.name_ === undefined) {
+                done: do {
+                    if (state.object_ && state.object_.isObject) {
+                        if (!state.props_) {
+                            state.props_ = Object.getOwnPropertyNames(state.object_.properties);
+                        }
+                        do {
+                            var prop = state.props_.shift();
+                        } while (prop && (state.visited_[prop] ||
+                            !Object.prototype.hasOwnProperty.call(state.object_.properties, prop)));
+                        if (prop) {
+                            state.visited_[prop] = true;
+                            if (Object.prototype.propertyIsEnumerable.call(state.object_.properties, prop)) {
+                                state.name_ = prop;
+                                break done;
+                            }
+                        }
+                    }
+                    else if (state.object_ !== null) {
+                        if (!state.props_) {
+                            state.props_ = Object.getOwnPropertyNames(state.object_);
+                        }
+                        do {
+                            var prop = state.props_.shift();
+                        } while (prop && state.visited_[prop]);
+                        if (prop) {
+                            state.visited_[prop] = true;
+                            state.name_ = prop;
+                            break done;
+                        }
+                    }
+                    state.object_ = this.getPrototype(state.object_);
+                    state.props_ = null;
+                } while (state.object_ !== null);
+                if (state.object_ === null) {
+                    // Done, exit loop.
+                    stack.pop();
+                    return;
+                }
+            }
+            // Fourth, find the variable
+            if (!state.doneVariable_) {
+                state.doneVariable_ = true;
+                var left = node['left'];
+                if (left['type'] === 'VariableDeclaration') {
+                    // Inline variable declaration: for (var x in y)
+                    state.variable_ =
+                        [Interpreter.SCOPE_REFERENCE, left['declarations'][0]['id']['name']];
+                }
+                else {
+                    // Arbitrary left side: for (foo().bar in y)
+                    state.variable_ = null;
+                    var nextState = new Interpreter.MyState(left, state.scope);
+                    nextState.components = true;
+                    return nextState;
+                }
+            }
+            if (!state.variable_) {
+                state.variable_ = state.value;
+            }
+            // Fifth, set the variable.
+            if (!state.doneSetter_) {
+                state.doneSetter_ = true;
+                var value = state.name_;
+                var setter = this.setValue(state.variable_, value);
+                if (setter) {
+                    return this.createSetter_(setter, state.variable_, value);
+                }
+            }
+            // Next step will be step three.
+            state.name_ = undefined;
+            // Reevaluate the variable since it could be a setter on the global object.
+            state.doneVariable_ = false;
+            state.doneSetter_ = false;
+            // Sixth and finally, execute the body if there was one.  this.
+            if (node['body']) {
+                return new Interpreter.MyState(node['body'], state.scope);
+            }
+        };
+        ;
+        Interpreter.prototype.stepForStatement = function (stack, state, node) {
+            var mode = state.mode_ || 0;
+            if (mode === 0) {
+                state.mode_ = 1;
+                if (node['init']) {
+                    return new Interpreter.MyState(node['init'], state.scope);
+                }
+            }
+            else if (mode === 1) {
+                state.mode_ = 2;
+                if (node['test']) {
+                    return new Interpreter.MyState(node['test'], state.scope);
+                }
+            }
+            else if (mode === 2) {
+                state.mode_ = 3;
+                if (node['test'] && !state.value) {
+                    // Done, exit loop.
+                    stack.pop();
+                }
+                else {
+                    state.isLoop = true;
+                    return new Interpreter.MyState(node['body'], state.scope);
+                }
+            }
+            else if (mode === 3) {
+                state.mode_ = 1;
+                if (node['update']) {
+                    return new Interpreter.MyState(node['update'], state.scope);
+                }
+            }
+        };
+        ;
+        Interpreter.prototype.stepFunctionDeclaration = function (stack, state, node) {
+            // This was found and handled when the scope was populated.
+            stack.pop();
+        };
+        ;
+        Interpreter.prototype.stepFunctionExpression = function (stack, state, node) {
+            stack.pop();
+            stack[stack.length - 1].value = this.createFunction(node, state.scope);
+        };
+        ;
+        Interpreter.prototype.stepIdentifier = function (stack, state, node) {
+            stack.pop();
+            if (state.components) {
+                stack[stack.length - 1].value = [Interpreter.SCOPE_REFERENCE, node['name']];
+                return;
+            }
+            var value = this.getValueFromScope(node['name']);
+            // An identifier could be a getter if it's a property on the global object.
+            if (value && typeof value === 'object' && value.isGetter) {
+                // Clear the getter flag and call the getter function.
+                value.isGetter = false;
+                var scope = state.scope;
+                while (!this.hasProperty(scope, node['name'])) {
+                    scope = scope.parentScope;
+                }
+                var func = (value);
+                return this.createGetter_(func, this.global);
+            }
+            stack[stack.length - 1].value = value;
+        };
+        ;
+        Interpreter.prototype.stepIfStatement = function (stack, state, node) {
+            return this.stepConditionalExpression(stack, state, node);
+        };
+        Interpreter.prototype.stepLabeledStatement = function (stack, state, node) {
+            // No need to hit this node again on the way back up the stack.
+            stack.pop();
+            // Note that a statement might have multiple labels.
+            var labels = state.labels || [];
+            labels.push(node['label']['name']);
+            var nextState = new Interpreter.MyState(node['body'], state.scope);
+            nextState.labels = labels;
+            return nextState;
+        };
+        ;
+        Interpreter.prototype.stepLiteral = function (stack, state, node) {
+            stack.pop();
+            var value = node['value'];
+            if (value instanceof RegExp) {
+                var pseudoRegexp = this.createObjectProto(this.REGEXP_PROTO);
+                this.populateRegExp(pseudoRegexp, value);
+                value = pseudoRegexp;
+            }
+            stack[stack.length - 1].value = value;
+        };
+        ;
+        Interpreter.prototype.stepLogicalExpression = function (stack, state, node) {
+            if (node['operator'] !== '&&' && node['operator'] !== '||') {
+                throw SyntaxError('Unknown logical operator: ' + node['operator']);
+            }
+            if (!state.doneLeft_) {
+                state.doneLeft_ = true;
+                return new Interpreter.MyState(node['left'], state.scope);
+            }
+            if (!state.doneRight_) {
+                if ((node['operator'] === '&&' && !state.value) ||
+                    (node['operator'] === '||' && state.value)) {
+                    // Shortcut evaluation.
+                    stack.pop();
+                    stack[stack.length - 1].value = state.value;
+                }
+                else {
+                    state.doneRight_ = true;
+                    return new Interpreter.MyState(node['right'], state.scope);
+                }
+            }
+            else {
+                stack.pop();
+                stack[stack.length - 1].value = state.value;
+            }
+        };
+        ;
+        Interpreter.prototype.stepMemberExpression = function (stack, state, node) {
+            if (!state.doneObject_) {
+                state.doneObject_ = true;
+                return new Interpreter.MyState(node['object'], state.scope);
+            }
+            var propName;
+            if (!node['computed']) {
+                state.object_ = state.value;
+                // obj.foo -- Just access 'foo' directly.
+                propName = node['property']['name'];
+            }
+            else if (!state.doneProperty_) {
+                state.object_ = state.value;
+                // obj[foo] -- Compute value of 'foo'.
+                state.doneProperty_ = true;
+                return new Interpreter.MyState(node['property'], state.scope);
+            }
+            else {
+                propName = state.value;
+            }
+            stack.pop();
+            if (state.components) {
+                stack[stack.length - 1].value = [state.object_, propName];
+            }
+            else {
+                var value = this.getProperty(state.object_, propName);
+                if (value && typeof value === 'object' && value.isGetter) {
+                    // Clear the getter flag and call the getter function.
+                    value.isGetter = false;
+                    var func = (value);
+                    return this.createGetter_(func, state.object_);
+                }
+                stack[stack.length - 1].value = value;
+            }
+        };
+        ;
+        Interpreter.prototype.stepNewExpression = function (stack, state, node) {
+            return this.stepCallExpression(stack, state, node);
+        };
+        Interpreter.prototype.stepObjectExpression = function (stack, state, node) {
+            var n = state.n_ || 0;
+            var property = node['properties'][n];
+            if (!state.object_) {
+                // First execution.
+                state.object_ = this.createObjectProto(this.OBJECT_PROTO);
+                state.properties_ = Object.create(null);
+            }
+            else {
+                // Determine property name.
+                var key = property['key'];
+                if (key['type'] === 'Identifier') {
+                    var propName = key['name'];
+                }
+                else if (key['type'] === 'Literal') {
+                    var propName = key['value'];
+                }
+                else {
+                    throw SyntaxError('Unknown object structure: ' + key['type']);
+                }
+                // Set the property computed in the previous execution.
+                if (!state.properties_[propName]) {
+                    // Create temp object to collect value, getter, and/or setter.
+                    state.properties_[propName] = {};
+                }
+                state.properties_[propName][property['kind']] = state.value;
+                state.n_ = ++n;
+                property = node['properties'][n];
+            }
+            if (property) {
+                return new Interpreter.MyState(property['value'], state.scope);
+            }
+            for (var key in state.properties_) {
+                var kinds = state.properties_[key];
+                if ('get' in kinds || 'set' in kinds) {
+                    // Set a property with a getter or setter.
+                    var descriptor = {
+                        configurable: true,
+                        enumerable: true,
+                        get: kinds['get'],
+                        set: kinds['set']
+                    };
+                    this.setProperty(state.object_, key, null, descriptor);
+                }
+                else {
+                    // Set a normal property with a value.
+                    this.setProperty(state.object_, key, kinds['init']);
+                }
+            }
+            stack.pop();
+            stack[stack.length - 1].value = state.object_;
+        };
+        ;
+        Interpreter.prototype.stepProgram = function (stack, state, node) {
+            var n = state.n_ || 0;
+            var expression = node['body'][n];
+            if (expression) {
+                state.done = false;
+                state.n_ = n + 1;
+                return new Interpreter.MyState(expression, state.scope);
+            }
+            state.done = true;
+            // Don't pop the stateStack.
+            // Leave the root scope on the tree in case the program is appended to.
+        };
+        ;
+        Interpreter.prototype.stepReturnStatement = function (stack, state, node) {
+            if (node['argument'] && !state.done_) {
+                state.done_ = true;
+                return new Interpreter.MyState(node['argument'], state.scope);
+            }
+            var value = state.value;
+            var i = stack.length - 1;
+            state = stack[i];
+            while (state.node['type'] !== 'CallExpression' &&
+                state.node['type'] !== 'NewExpression') {
+                if (state.node['type'] !== 'TryStatement') {
+                    stack.splice(i, 1);
+                }
+                i--;
+                if (i < 0) {
+                    // Syntax error, do not allow this error to be trapped.
+                    throw SyntaxError('Illegal return statement');
+                }
+                state = stack[i];
+            }
+            state.value = value;
+        };
+        ;
+        Interpreter.prototype.stepSequenceExpression = function (stack, state, node) {
+            var n = state.n_ || 0;
+            var expression = node['expressions'][n];
+            if (expression) {
+                state.n_ = n + 1;
+                return new Interpreter.MyState(expression, state.scope);
+            }
+            stack.pop();
+            stack[stack.length - 1].value = state.value;
+        };
+        ;
+        Interpreter.prototype.stepSwitchStatement = function (stack, state, node) {
+            if (!state.test_) {
+                state.test_ = 1;
+                return new Interpreter.MyState(node['discriminant'], state.scope);
+            }
+            if (state.test_ === 1) {
+                state.test_ = 2;
+                // Preserve switch value between case tests.
+                state.switchValue_ = state.value;
+            }
+            while (true) {
+                var index = state.index_ || 0;
+                var switchCase = node['cases'][index];
+                if (!state.matched_ && switchCase && !switchCase['test']) {
+                    // Test on the default case is null.
+                    // Bypass (but store) the default case, and get back to it later.
+                    state.defaultCase_ = index;
+                    state.index_ = index + 1;
+                    continue;
+                }
+                if (!switchCase && !state.matched_ && state.defaultCase_) {
+                    // Ran through all cases, no match.  Jump to the default.
+                    state.matched_ = true;
+                    state.index_ = state.defaultCase_;
+                    continue;
+                }
+                if (switchCase) {
+                    if (!state.matched_ && !state.tested_ && switchCase['test']) {
+                        state.tested_ = true;
+                        return new Interpreter.MyState(switchCase['test'], state.scope);
+                    }
+                    if (state.matched_ || state.value === state.switchValue_) {
+                        state.matched_ = true;
+                        var n = state.n_ || 0;
+                        if (switchCase['consequent'][n]) {
+                            state.isSwitch = true;
+                            state.n_ = n + 1;
+                            return new Interpreter.MyState(switchCase['consequent'][n], state.scope);
+                        }
+                    }
+                    // Move on to next case.
+                    state.tested_ = false;
+                    state.n_ = 0;
+                    state.index_ = index + 1;
+                }
+                else {
+                    stack.pop();
+                    return;
+                }
+            }
+        };
+        ;
+        Interpreter.prototype.stepThisExpression = function (stack, state, node) {
+            stack.pop();
+            stack[stack.length - 1].value = this.getValueFromScope('this');
+        };
+        ;
+        Interpreter.prototype.stepThrowStatement = function (stack, state, node) {
+            if (!state.done_) {
+                state.done_ = true;
+                return new Interpreter.MyState(node['argument'], state.scope);
+            }
+            else {
+                this.throwException(state.value);
+            }
+        };
+        ;
+        Interpreter.prototype.stepTryStatement = function (stack, state, node) {
+            if (!state.doneBlock_) {
+                state.doneBlock_ = true;
+                return new Interpreter.MyState(node['block'], state.scope);
+            }
+            if (state.throwValue && !state.doneHandler_ && node['handler']) {
+                state.doneHandler_ = true;
+                var nextState = new Interpreter.MyState(node['handler'], state.scope);
+                nextState.throwValue = state.throwValue;
+                state.throwValue = null; // This error has been handled, don't rethrow.
+                return nextState;
+            }
+            if (!state.doneFinalizer_ && node['finalizer']) {
+                state.doneFinalizer_ = true;
+                return new Interpreter.MyState(node['finalizer'], state.scope);
+            }
+            if (state.throwValue) {
+                // There was no catch handler, or the catch/finally threw an error.
+                // Throw the error up to a higher try.
+                this.executeException(state.throwValue);
+            }
+            else {
+                stack.pop();
+            }
+        };
+        ;
+        Interpreter.prototype.stepUnaryExpression = function (stack, state, node) {
+            if (!state.done_) {
+                state.done_ = true;
+                var nextState = new Interpreter.MyState(node['argument'], state.scope);
+                nextState.components = node['operator'] === 'delete';
+                return nextState;
+            }
+            stack.pop();
+            var value = state.value;
+            if (node['operator'] === '-') {
+                value = -value;
+            }
+            else if (node['operator'] === '+') {
+                value = +value;
+            }
+            else if (node['operator'] === '!') {
+                value = !value;
+            }
+            else if (node['operator'] === '~') {
+                value = ~value;
+            }
+            else if (node['operator'] === 'delete') {
+                var result = true;
+                // If value is not an array, then it is a primitive, or some other value.
+                // If so, skip the delete and return true.
+                if (Array.isArray(value)) {
+                    var obj = value[0];
+                    if (obj === Interpreter.SCOPE_REFERENCE) {
+                        // 'delete foo;' is the same as 'delete window.foo'.
+                        obj = state.scope;
+                    }
+                    var name = String(value[1]);
+                    try {
+                        delete obj.properties[name];
+                    }
+                    catch (e) {
+                        if (state.scope.strict) {
+                            this.throwException(this.TYPE_ERROR, "Cannot delete property '" +
+                                name + "' of '" + obj + "'");
+                        }
+                        else {
+                            result = false;
+                        }
+                    }
+                }
+                value = result;
+            }
+            else if (node['operator'] === 'typeof') {
+                value = (value && value.class === 'Function') ? 'function' : typeof value;
+            }
+            else if (node['operator'] === 'void') {
+                value = undefined;
+            }
+            else {
+                throw SyntaxError('Unknown unary operator: ' + node['operator']);
+            }
+            stack[stack.length - 1].value = value;
+        };
+        ;
+        Interpreter.prototype.stepUpdateExpression = function (stack, state, node) {
+            if (!state.doneLeft_) {
+                state.doneLeft_ = true;
+                var nextState = new Interpreter.MyState(node['argument'], state.scope);
+                nextState.components = true;
+                return nextState;
+            }
+            if (!state.leftSide_) {
+                state.leftSide_ = state.value;
+            }
+            if (state.doneGetter_) {
+                state.leftValue_ = state.value;
+            }
+            if (!state.doneGetter_) {
+                var leftValue = this.getValue(state.leftSide_);
+                state.leftValue_ = leftValue;
+                if (leftValue && typeof leftValue === 'object' && leftValue.isGetter) {
+                    // Clear the getter flag and call the getter function.
+                    leftValue.isGetter = false;
+                    state.doneGetter_ = true;
+                    var func = (leftValue);
+                    return this.createGetter_(func, state.leftSide_);
+                }
+            }
+            if (state.doneSetter_) {
+                // Return if setter function.
+                // Setter method on property has completed.
+                // Ignore its return value, and use the original set value instead.
+                stack.pop();
+                stack[stack.length - 1].value = state.doneSetter_;
+                return;
+            }
+            leftValue = Number(state.leftValue_);
+            var changeValue;
+            if (node['operator'] === '++') {
+                changeValue = leftValue + 1;
+            }
+            else if (node['operator'] === '--') {
+                changeValue = leftValue - 1;
+            }
+            else {
+                throw SyntaxError('Unknown update expression: ' + node['operator']);
+            }
+            var returnValue = node['prefix'] ? changeValue : leftValue;
+            var setter = this.setValue(state.leftSide_, changeValue);
+            if (setter) {
+                state.doneSetter_ = returnValue;
+                return this.createSetter_(setter, state.leftSide_, changeValue);
+            }
+            // Return if no setter function.
+            stack.pop();
+            stack[stack.length - 1].value = returnValue;
+        };
+        ;
+        Interpreter.prototype.stepVariableDeclaration = function (stack, state, node) {
+            var declarations = node['declarations'];
+            var n = state.n_ || 0;
+            var declarationNode = declarations[n];
+            if (state.init_ && declarationNode) {
+                // This setValue call never needs to deal with calling a setter function.
+                // Note that this is setting the init value, not defining the variable.
+                // Variable definition is done when scope is populated.
+                this.setValueToScope(declarationNode['id']['name'], state.value);
+                state.init_ = false;
+                declarationNode = declarations[++n];
+            }
+            while (declarationNode) {
+                // Skip any declarations that are not initialized.  They have already
+                // been defined as undefined in populateScope_.
+                if (declarationNode['init']) {
+                    state.n_ = n;
+                    state.init_ = true;
+                    return new Interpreter.MyState(declarationNode['init'], state.scope);
+                }
+                declarationNode = declarations[++n];
+            }
+            stack.pop();
+        };
+        ;
+        Interpreter.prototype.stepWithStatement = function (stack, state, node) {
+            if (!state.doneObject_) {
+                state.doneObject_ = true;
+                return new Interpreter.MyState(node['object'], state.scope);
+            }
+            else if (!state.doneBody_) {
+                state.doneBody_ = true;
+                var scope = this.createSpecialScope(state.scope, state.value);
+                return new Interpreter.MyState(node['body'], scope);
+            }
+            else {
+                stack.pop();
+            }
+        };
+        ;
+        Interpreter.prototype.stepWhileStatement = function (stack, state, node) {
+            return this.stepDoWhileStatement(stack, state, node);
+        };
+        /**
+         * @const {!Object} Configuration used for all Acorn parsing.
+         */
+        Interpreter.PARSE_OPTIONS = {
+            ecmaVersion: 5
+        };
+        /**
+         * Property descriptor of readonly properties.
+         */
+        Interpreter.READONLY_DESCRIPTOR = {
+            configurable: true,
+            enumerable: true,
+            writable: false
+        };
+        /**
+         * Property descriptor of non-enumerable properties.
+         */
+        Interpreter.NONENUMERABLE_DESCRIPTOR = {
+            configurable: true,
+            enumerable: false,
+            writable: true
+        };
+        /**
+         * Property descriptor of readonly, non-enumerable properties.
+         */
+        Interpreter.READONLY_NONENUMERABLE_DESCRIPTOR = {
+            configurable: true,
+            enumerable: false,
+            writable: false
+        };
+        /**
+         * Property descriptor of variables.
+         */
+        Interpreter.VARIABLE_DESCRIPTOR = {
+            configurable: false,
+            enumerable: true,
+            writable: true
+        };
+        /**
+         * Unique symbol for indicating that a step has encountered an error, has
+         * added it to the stack, and will be thrown within the user's program.
+         * When STEP_ERROR is thrown in the JS-Interpreter, the error can be ignored.
+         */
+        Interpreter.STEP_ERROR = {};
+        /**
+         * Unique symbol for indicating that a reference is a variable on the scope,
+         * not an object property.
+         */
+        Interpreter.SCOPE_REFERENCE = {};
+        /**
+         * For cycle detection in array to string and error conversion;
+         * see spec bug github.com/tc39/ecma262/issues/289
+         * Since this is for atomic actions only, it can be a class property.
+         */
+        Interpreter.toStringCycles_ = [];
+        return Interpreter;
+    }());
+    (function (Interpreter) {
+        /**
+         * Class for an object.
+         * @param {Interpreter.MyObject} proto Prototype object or null.
+         * @constructor
+         */
+        var MyObject = (function () {
+            function MyObject(proto) {
+                /** @type {Interpreter.MyObject} */
+                this.proto = null;
+                /** @type {boolean} */
+                this.isObject = true;
+                /** @type {string} */
+                this.class = 'Object';
+                /** @type {Date|RegExp|boolean|number|string|undefined|null} */
+                this.data = null;
+                this.getter = Object.create(null);
+                this.setter = Object.create(null);
+                this.properties = Object.create(null);
+                this.proto = proto;
+            }
+            /**
+             * Convert this object into a string.
+             * @return {string} String value.
+             * @override
+             */
+            MyObject.prototype.toString = function () {
+                if (this.class === 'Array') {
+                    // Array
+                    var cycles = Interpreter.toStringCycles_;
+                    cycles.push(this);
+                    try {
+                        var strs = [];
+                        for (var i = 0; i < this.properties.length; i++) {
+                            var value = this.properties[i];
+                            strs[i] = (value && value.isObject && cycles.indexOf(value) !== -1) ?
+                                '...' : value;
+                        }
+                    }
+                    finally {
+                        cycles.pop();
+                    }
+                    return strs.join(',');
+                }
+                if (this.class === 'Error') {
+                    var cycles = Interpreter.toStringCycles_;
+                    if (cycles.indexOf(this) !== -1) {
+                        return '[object Error]';
+                    }
+                    var name, message;
+                    // Bug: Does not support getters and setters for name or message.
+                    var obj = this;
+                    do {
+                        if ('name' in obj.properties) {
+                            name = obj.properties['name'];
+                            break;
+                        }
+                    } while ((obj = obj.proto));
+                    var obj = this;
+                    do {
+                        if ('message' in obj.properties) {
+                            message = obj.properties['message'];
+                            break;
+                        }
+                    } while ((obj = obj.proto));
+                    cycles.push(this);
+                    try {
+                        name = name && name.toString();
+                        message = message && message.toString();
+                    }
+                    finally {
+                        cycles.pop();
+                    }
+                    return message ? name + ': ' + message : String(name);
+                }
+                // RegExp, Date, and boxed primitives.
+                if (this.data !== null) {
+                    return String(this.data);
+                }
+                return '[object ' + this.class + ']';
+            };
+            /**
+             * Return the object's value.
+             * @return {Interpreter.MyValue} Value.
+             * @override
+             */
+            MyObject.prototype.valueOf = function () {
+                if (this.data === undefined || this.data === null ||
+                    this.data instanceof RegExp) {
+                    return this; // An Object.
+                }
+                if (this.data instanceof Date) {
+                    return this.data.valueOf(); // Milliseconds.
+                }
+                return (this.data); // Boxed primitive.
+            };
+            return MyObject;
+        }());
+        Interpreter.MyObject = MyObject;
+        /**
+         * Class for a state.
+         * @param {!MyObject} node AST node for the state.
+         * @param {!Interpreter.MyObject} scope Scope object for the state.
+         * @constructor
+         */
+        var MyState = (function () {
+            function MyState(node, scope) {
+                this.node = node;
+                this.scope = scope;
+            }
+            return MyState;
+        }());
+        Interpreter.MyState = MyState;
+    })(Interpreter || (Interpreter = {}));
+    // These lines are added for API compatibility
+    Interpreter['Object'] = Interpreter.MyObject;
+    Interpreter['State'] = Interpreter.MyState;
+    // Look for globally-defined acorn
+    try {
+        Interpreter.acorn = (self || global)['acorn'];
+    }
+    catch (e) {
+        // do nothing if we fail
+    }
+    return Interpreter;
+});
+//# sourceMappingURL=interpreter.js.map
\ No newline at end of file
diff --git a/dist/interpreter.js.map b/dist/interpreter.js.map
new file mode 100644
index 00000000..431a75f5
--- /dev/null
+++ b/dist/interpreter.js.map
@@ -0,0 +1 @@
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\ No newline at end of file
diff --git a/docs.html b/docs.html
index bf8429b5..b0edd823 100644
--- a/docs.html
+++ b/docs.html
@@ -17,7 +17,7 @@ <h1>JS-Interpreter Documentation</h1>
 
   <p>Play with the <a href="index.html">JS-Interpreter demo</a>.</p>
 
-  <p>Get the <a href="https://github.com/NeilFraser/JS-Interpreter">source code</a>.</p>
+  <p>Get the <a href="https://github.com/arcatdmz/JS-Interpreter">source code</a>.</p>
 
   <h2>Usage</h2>
 
diff --git a/index.html b/index.html
index df0db99d..140ea668 100644
--- a/index.html
+++ b/index.html
@@ -7,12 +7,16 @@
 
   <script>
     // Depending on the URL argument, test the compressed or uncompressed version.
-    var compressed = (document.location.search == '?compressed');
-    if (compressed) {
-      document.write('<scr'+'ipt src="acorn_interpreter.js"></scr'+'ipt>');
+    var compressed = (document.location.search == '?compressed')
+      , required = (document.location.search == '?required');
+    if (required) {
+      document.write('<scr'+'ipt src="lib/acorn.js"></scr'+'ipt>');
+      document.write('<scr'+'ipt src="lib/require.js"></scr'+'ipt>');
+    } else if (compressed) {
+      document.write('<scr'+'ipt src="dist/acorn_interpreter.js"></scr'+'ipt>');
     } else {
-      document.write('<scr'+'ipt src="acorn.js"></scr'+'ipt>');
-      document.write('<scr'+'ipt src="interpreter.js"></scr'+'ipt>');
+      document.write('<scr'+'ipt src="lib/acorn.js"></scr'+'ipt>');
+      document.write('<scr'+'ipt src="dist/interpreter.global.js"></scr'+'ipt>');
     }
 
     var myInterpreter;
@@ -26,6 +30,13 @@
 
     function parseButton() {
       var code = document.getElementById('code').value
+      if (typeof Interpreter === 'undefined') {
+        requirejs(['dist/interpreter'], function (Interpreter) {
+          myInterpreter = new Interpreter(code, initAlert);
+          disable('');
+        });
+        return;
+      }
       myInterpreter = new Interpreter(code, initAlert);
       disable('');
     }
@@ -105,17 +116,19 @@ <h1>JS-Interpreter Demo</h1>
 
   <p><small>
   <script>
-    if (compressed) {
+    if (required) {
+      document.write('[ Running AMD bundled library dynamically loaded with RequireJS.  Switch to <A HREF="?uncompressed">raw sources</A>. ]');
+    } else if (compressed) {
       document.write('[ Running compressed bundle.  Switch to <A HREF="?uncompressed">raw sources</A>. ]');
     } else {
-      document.write('[ Running raw sources.  Switch to <A HREF="?compressed">compressed bundle</A>. ]');
+      document.write('[ Running raw sources.  Switch to <A HREF="?compressed">compressed bundle</A> or <A HREF="?required">dynamically loaded library</A>. ]');
     }
     disable('disabled');
   </script>
   </small></p>
 
   <p>Read the <a href="docs.html">JS-Interpreter documentation</a>.</p>
-  <p>Get the <a href="https://github.com/NeilFraser/JS-Interpreter">source code</a>.</p>
+  <p>Get the <a href="https://github.com/arcatdmz/JS-Interpreter">source code</a>.</p>
 
 </body>
 </html>
diff --git a/lib/_estree.d.ts b/lib/_estree.d.ts
new file mode 100644
index 00000000..307750a6
--- /dev/null
+++ b/lib/_estree.d.ts
@@ -0,0 +1,5 @@
+/// <reference types="estree" />
+
+import * as _ESTree from 'estree';
+export as namespace ESTree;
+export = _ESTree;
diff --git a/acorn.js b/lib/acorn.js
similarity index 100%
rename from acorn.js
rename to lib/acorn.js
diff --git a/lib/acorn_interpreter.ts b/lib/acorn_interpreter.ts
new file mode 100644
index 00000000..c82d55b4
--- /dev/null
+++ b/lib/acorn_interpreter.ts
@@ -0,0 +1,30 @@
+import acorn = require('./acorn');
+import Interpreter = require('./interpreter');
+
+/*!
+ * @license
+ * JavaScript Interpreter bundled with acorn v0.4.1
+ *
+ * Copyright 2013-2017 Google Inc. and Jun Kato
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @fileoverview Interpreting JavaScript in JavaScript (concatenated with acorn)
+ * @author fraser@google.com (Neil Fraser)
+ * @author i@junkato.jp (Jun Kato)
+ */
+
+Interpreter.acorn = acorn;
+export = Interpreter;
diff --git a/interpreter.js b/lib/interpreter.ts
similarity index 82%
rename from interpreter.js
rename to lib/interpreter.ts
index 8833c2cd..b421a4be 100644
--- a/interpreter.js
+++ b/lib/interpreter.ts
@@ -1,8 +1,14 @@
+/// <reference path="./_estree.d.ts" />
+
+// Declare missing functions
+declare function escape(s:string): string;
+declare function unescape(s:string): string;
+
 /**
  * @license
  * JavaScript Interpreter
  *
- * Copyright 2013 Google Inc.
+ * Copyright 2013-2017 Google Inc. and Jun Kato
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -20,8 +26,8 @@
 /**
  * @fileoverview Interpreting JavaScript in JavaScript.
  * @author fraser@google.com (Neil Fraser)
+ * @author i@junkato.jp (Jun Kato)
  */
-'use strict';
 
 /**
  * Create a new interpreter.
@@ -31,9 +37,56 @@
  *     global scope object.
  * @constructor
  */
-var Interpreter = function(code, opt_initFunc) {
+class Interpreter {
+public static acorn: Interpreter.Acorn;
+
+private nodeConstructor: Interpreter.NodeConstructor;
+public ast: ESTree.Program;
+public global: Interpreter.MyObject;
+public stateStack: Interpreter.MyState[];
+public value: Interpreter.MyValue;
+private initFunc_: (i: Interpreter, scope: Interpreter.MyObject) => void;
+private paused_: boolean;
+private polyfills_: string[];
+private functionCounter_: number;
+private stepFunctions_: { [key: string]: Function };
+
+public OBJECT: Interpreter.MyObject;
+public OBJECT_PROTO: Interpreter.MyObject;
+public FUNCTION: Interpreter.MyObject;
+public FUNCTION_PROTO: Interpreter.MyObject;
+public ARRAY: Interpreter.MyObject;
+public ARRAY_PROTO: Interpreter.MyObject;
+public REGEXP: Interpreter.MyObject;
+public REGEXP_PROTO: Interpreter.MyObject;
+
+public ERROR: Interpreter.MyObject;
+public EVAL_ERROR: Interpreter.MyObject;
+public RANGE_ERROR: Interpreter.MyObject;
+public REFERENCE_ERROR: Interpreter.MyObject;
+public SYNTAX_ERROR: Interpreter.MyObject;
+public TYPE_ERROR: Interpreter.MyObject;
+public URI_ERROR: Interpreter.MyObject;
+
+public STRING: Interpreter.MyObject;
+public BOOLEAN: Interpreter.MyObject;
+public NUMBER: Interpreter.MyObject;
+public DATE: Interpreter.MyObject;
+
+// The following properties are obsolete.  Do not use.
+public UNDEFINED: Interpreter.MyObject;
+public NULL: null;
+public NAN: number;
+public TRUE: boolean;
+public FALSE: boolean;
+public STRING_EMPTY: string;
+public NUMBER_ZERO: number;
+public NUMBER_ONE: number;
+
+constructor(code: string | ESTree.Program
+    , opt_initFunc?: (i: Interpreter, scope: Interpreter.MyObject) => void) {
   if (typeof code === 'string') {
-    code = acorn.parse(code, Interpreter.PARSE_OPTIONS);
+    code = Interpreter.acorn.parse(code, Interpreter.PARSE_OPTIONS);
   }
   this.ast = code;
   this.initFunc_ = opt_initFunc;
@@ -46,31 +99,33 @@ var Interpreter = function(code, opt_initFunc) {
   this.stepFunctions_ = Object.create(null);
   var stepMatch = /^step([A-Z]\w*)$/;
   var m;
-  for (var methodName in this) {
-    if ((typeof this[methodName] === 'function') &&
+  var props = Object.getOwnPropertyNames(Interpreter.prototype);
+  for (var i = 0; i < props.length; i ++) {
+    var methodName = props[i];
+    if ((typeof Interpreter.prototype[methodName] === 'function') &&
         (m = methodName.match(stepMatch))) {
-      this.stepFunctions_[m[1]] = this[methodName].bind(this);
+      this.stepFunctions_[m[1]] = (<Function>Interpreter.prototype[methodName]).bind(this);
     }
   }
   // Create and initialize the global scope.
   this.global = this.createScope(this.ast, null);
   // Run the polyfills.
-  this.ast = acorn.parse(this.polyfills_.join('\n'), Interpreter.PARSE_OPTIONS);
+  this.ast = Interpreter.acorn.parse(this.polyfills_.join('\n'), Interpreter.PARSE_OPTIONS);
   this.polyfills_ = undefined;  // Allow polyfill strings to garbage collect.
   this.stripLocations_(this.ast, undefined, undefined);
-  var state = new Interpreter.State(this.ast, this.global);
+  var state = new Interpreter.MyState(this.ast, this.global);
   state.done = false;
   this.stateStack = [state];
   this.run();
   this.value = undefined;
   // Point at the main program.
   this.ast = code;
-  var state = new Interpreter.State(this.ast, this.global);
+  var state = new Interpreter.MyState(this.ast, this.global);
   state.done = false;
   this.stateStack.length = 0;
   this.stateStack[0] = state;
   // Get a handle on Acorn's node_t object.  It's tricky to access.
-  this.nodeConstructor = state.node.constructor;
+  this.nodeConstructor = <Interpreter.NodeConstructor>state.node.constructor;
   // Preserve publicly properties from being pruned/renamed by JS compilers.
   // Add others as needed.
   this['stateStack'] = this.stateStack;
@@ -87,14 +142,14 @@ var Interpreter = function(code, opt_initFunc) {
 /**
  * @const {!Object} Configuration used for all Acorn parsing.
  */
-Interpreter.PARSE_OPTIONS = {
+static PARSE_OPTIONS = {
   ecmaVersion: 5
 };
 
 /**
  * Property descriptor of readonly properties.
  */
-Interpreter.READONLY_DESCRIPTOR = {
+static READONLY_DESCRIPTOR: Interpreter.MyDescriptor = {
   configurable: true,
   enumerable: true,
   writable: false
@@ -103,7 +158,7 @@ Interpreter.READONLY_DESCRIPTOR = {
 /**
  * Property descriptor of non-enumerable properties.
  */
-Interpreter.NONENUMERABLE_DESCRIPTOR = {
+static NONENUMERABLE_DESCRIPTOR: Interpreter.MyDescriptor = {
   configurable: true,
   enumerable: false,
   writable: true
@@ -112,7 +167,7 @@ Interpreter.NONENUMERABLE_DESCRIPTOR = {
 /**
  * Property descriptor of readonly, non-enumerable properties.
  */
-Interpreter.READONLY_NONENUMERABLE_DESCRIPTOR = {
+static READONLY_NONENUMERABLE_DESCRIPTOR: Interpreter.MyDescriptor = {
   configurable: true,
   enumerable: false,
   writable: false
@@ -121,7 +176,7 @@ Interpreter.READONLY_NONENUMERABLE_DESCRIPTOR = {
 /**
  * Property descriptor of variables.
  */
-Interpreter.VARIABLE_DESCRIPTOR = {
+static VARIABLE_DESCRIPTOR: Interpreter.MyDescriptor = {
   configurable: false,
   enumerable: true,
   writable: true
@@ -132,32 +187,32 @@ Interpreter.VARIABLE_DESCRIPTOR = {
  * added it to the stack, and will be thrown within the user's program.
  * When STEP_ERROR is thrown in the JS-Interpreter, the error can be ignored.
  */
-Interpreter.STEP_ERROR = {};
+static STEP_ERROR = {};
 
 /**
  * Unique symbol for indicating that a reference is a variable on the scope,
  * not an object property.
  */
-Interpreter.SCOPE_REFERENCE = {};
+static SCOPE_REFERENCE = {};
 
 /**
  * For cycle detection in array to string and error conversion;
  * see spec bug github.com/tc39/ecma262/issues/289
  * Since this is for atomic actions only, it can be a class property.
  */
-Interpreter.toStringCycles_ = [];
+static toStringCycles_ = [];
 
 /**
  * Add more code to the interpreter.
  * @param {string|!Object} code Raw JavaScript text or AST.
  */
-Interpreter.prototype.appendCode = function(code) {
+public appendCode(code: string | ESTree.Node) {
   var state = this.stateStack[0];
   if (!state || state.node['type'] !== 'Program') {
     throw Error('Expecting original AST to start with a Program node.');
   }
   if (typeof code === 'string') {
-    code = acorn.parse(code, Interpreter.PARSE_OPTIONS);
+    code = Interpreter.acorn.parse(code, Interpreter.PARSE_OPTIONS);
   }
   if (!code || code['type'] !== 'Program') {
     throw Error('Expecting new AST to start with a Program node.');
@@ -174,7 +229,7 @@ Interpreter.prototype.appendCode = function(code) {
  * Execute one step of the interpreter.
  * @return {boolean} True if a step was executed, false if no more instructions.
  */
-Interpreter.prototype.step = function() {
+public step(): boolean {
   var stack = this.stateStack;
   var state = stack[stack.length - 1];
   if (!state) {
@@ -210,16 +265,16 @@ Interpreter.prototype.step = function() {
  * @return {boolean} True if a execution is asynchronously blocked,
  *     false if no more instructions.
  */
-Interpreter.prototype.run = function() {
+public run() {
   while (!this.paused_ && this.step()) {}
   return this.paused_;
 };
 
 /**
  * Initialize the global scope with buitin properties and functions.
- * @param {!Interpreter.Object} scope Global scope.
+ * @param {!Interpreter.MyObject} scope Global scope.
  */
-Interpreter.prototype.initGlobalScope = function(scope) {
+public initGlobalScope(scope: Interpreter.MyObject) {
   // Initialize uneditable global properties.
   this.setProperty(scope, 'NaN', NaN,
                    Interpreter.READONLY_DESCRIPTOR);
@@ -235,8 +290,8 @@ Interpreter.prototype.initGlobalScope = function(scope) {
 
   // Create the objects which will become Object.prototype and
   // Function.prototype, which are needed to bootstrap everything else.
-  this.OBJECT_PROTO = new Interpreter.Object(null);
-  this.FUNCTION_PROTO = new Interpreter.Object(this.OBJECT_PROTO);
+  this.OBJECT_PROTO = new Interpreter.MyObject(null);
+  this.FUNCTION_PROTO = new Interpreter.MyObject(this.OBJECT_PROTO);
   // Initialize global objects.
   this.initFunction(scope);
   this.initObject(scope);
@@ -273,13 +328,13 @@ Interpreter.prototype.initGlobalScope = function(scope) {
   this.setProperty(scope, 'isFinite',
       this.createNativeFunction(isFinite, false));
 
-  var strFunctions = [
+  var strFunctions: any[] = [
     [escape, 'escape'], [unescape, 'unescape'],
     [decodeURI, 'decodeURI'], [decodeURIComponent, 'decodeURIComponent'],
     [encodeURI, 'encodeURI'], [encodeURIComponent, 'encodeURIComponent']
   ];
   for (var i = 0; i < strFunctions.length; i++) {
-    var wrapper = (function(nativeFunc) {
+    var wrapper = (function(nativeFunc: (s: string) => string) {
       return function(str) {
         try {
           return nativeFunc(str);
@@ -302,9 +357,9 @@ Interpreter.prototype.initGlobalScope = function(scope) {
 
 /**
  * Initialize the Function class.
- * @param {!Interpreter.Object} scope Global scope.
+ * @param {!Interpreter.MyObject} scope Global scope.
  */
-Interpreter.prototype.initFunction = function(scope) {
+public initFunction(scope: Interpreter.MyObject) {
   var thisInterpreter = this;
   var wrapper;
   var identifierRegexp = /^[A-Za-z_$][\w$]*$/;
@@ -312,7 +367,7 @@ Interpreter.prototype.initFunction = function(scope) {
   wrapper = function(var_args) {
     if (thisInterpreter.calledWithNew()) {
       // Called as new Function().
-      var newFunc = this;
+      var newFunc = <Interpreter.MyObject>this;
     } else {
       // Called as Function().
       var newFunc =
@@ -323,7 +378,7 @@ Interpreter.prototype.initFunction = function(scope) {
     } else {
       var code = '';
     }
-    var args = [];
+    var args: string[] | string = [];
     for (var i = 0; i < arguments.length - 1; i++) {
       var name = String(arguments[i]);
       if (!name.match(identifierRegexp)) {
@@ -339,7 +394,7 @@ Interpreter.prototype.initFunction = function(scope) {
     // Acorn needs to parse code in the context of a function or else 'return'
     // statements will be syntax errors.
     try {
-    var ast = acorn.parse('$ = function(' + args + ') {' + code + '};',
+    var ast = Interpreter.acorn.parse('$ = function(' + args + ') {' + code + '};',
         Interpreter.PARSE_OPTIONS);
     } catch (e) {
       // Acorn threw a SyntaxError.  Rethrow as a trappable error.
@@ -474,9 +529,9 @@ Interpreter.prototype.initFunction = function(scope) {
 
 /**
  * Initialize the Object class.
- * @param {!Interpreter.Object} scope Global scope.
+ * @param {!Interpreter.MyObject} scope Global scope.
  */
-Interpreter.prototype.initObject = function(scope) {
+public initObject(scope: Interpreter.MyObject) {
   var thisInterpreter = this;
   var wrapper;
   // Object constructor.
@@ -510,7 +565,7 @@ Interpreter.prototype.initObject = function(scope) {
   /**
    * Checks if the provided value is null or undefined.
    * If so, then throw an error in the call stack.
-   * @param {Interpreter.Value} value Value to check.
+   * @param {Interpreter.MyValue} value Value to check.
    */
   var throwIfNullUndefined = function(value) {
     if (value === undefined || value === null) {
@@ -638,7 +693,7 @@ Interpreter.prototype.initObject = function(scope) {
       delete descriptor.value;
       delete descriptor.writable;
     }
-    var pseudoDescriptor = thisInterpreter.nativeToPseudo(descriptor);
+    var pseudoDescriptor = <Interpreter.MyObject>thisInterpreter.nativeToPseudo(descriptor);
     if ('value' in descriptor) {
       thisInterpreter.setProperty(pseudoDescriptor, 'value', descriptor.value);
     }
@@ -675,11 +730,11 @@ Interpreter.prototype.initObject = function(scope) {
 
   // Instance methods on Object.
   this.setNativeFunctionPrototype(this.OBJECT, 'toString',
-      Interpreter.Object.prototype.toString);
+      Interpreter.MyObject.prototype.toString);
   this.setNativeFunctionPrototype(this.OBJECT, 'toLocaleString',
-      Interpreter.Object.prototype.toString);
+      Interpreter.MyObject.prototype.toString);
   this.setNativeFunctionPrototype(this.OBJECT, 'valueOf',
-      Interpreter.Object.prototype.valueOf);
+      Interpreter.MyObject.prototype.valueOf);
 
   wrapper = function(prop) {
     throwIfNullUndefined(this);
@@ -714,9 +769,9 @@ Interpreter.prototype.initObject = function(scope) {
 
 /**
  * Initialize the Array class.
- * @param {!Interpreter.Object} scope Global scope.
+ * @param {!Interpreter.MyObject} scope Global scope.
  */
-Interpreter.prototype.initArray = function(scope) {
+public initArray(scope: Interpreter.MyObject) {
   var thisInterpreter = this;
   var getInt = function(obj, def) {
     // Return an integer, or the default.
@@ -731,7 +786,7 @@ Interpreter.prototype.initArray = function(scope) {
   wrapper = function(var_args) {
     if (thisInterpreter.calledWithNew()) {
       // Called as new Array().
-      var newArray = this;
+      var newArray = <Interpreter.MyObject>this;
     } else {
       // Called as Array().
       var newArray =
@@ -1037,9 +1092,9 @@ Interpreter.prototype.initArray = function(scope) {
 
 /**
  * Initialize the String class.
- * @param {!Interpreter.Object} scope Global scope.
+ * @param {!Interpreter.MyObject} scope Global scope.
  */
-Interpreter.prototype.initString = function(scope) {
+public initString(scope: Interpreter.MyObject) {
   var thisInterpreter = this;
   var wrapper;
   // String constructor.
@@ -1150,9 +1205,9 @@ Interpreter.prototype.initString = function(scope) {
 
 /**
  * Initialize the Boolean class.
- * @param {!Interpreter.Object} scope Global scope.
+ * @param {!Interpreter.MyObject} scope Global scope.
  */
-Interpreter.prototype.initBoolean = function(scope) {
+public initBoolean(scope: Interpreter.MyObject) {
   var thisInterpreter = this;
   var wrapper;
   // Boolean constructor.
@@ -1173,9 +1228,9 @@ Interpreter.prototype.initBoolean = function(scope) {
 
 /**
  * Initialize the Number class.
- * @param {!Interpreter.Object} scope Global scope.
+ * @param {!Interpreter.MyObject} scope Global scope.
  */
-Interpreter.prototype.initNumber = function(scope) {
+public initNumber(scope: Interpreter.MyObject) {
   var thisInterpreter = this;
   var wrapper;
   // Number constructor.
@@ -1251,9 +1306,9 @@ Interpreter.prototype.initNumber = function(scope) {
 
 /**
  * Initialize the Date class.
- * @param {!Interpreter.Object} scope Global scope.
+ * @param {!Interpreter.MyObject} scope Global scope.
  */
-Interpreter.prototype.initDate = function(scope) {
+public initDate(scope: Interpreter.MyObject) {
   var thisInterpreter = this;
   var wrapper;
   // Date constructor.
@@ -1264,7 +1319,7 @@ Interpreter.prototype.initDate = function(scope) {
       return Date();
     }
     // Called as new Date().
-    var args = [null].concat(Array.from(arguments));
+    var args = [null].concat([].slice.call(arguments));
     this.data = new (Function.prototype.bind.apply(Date, args));
     return this;
   };
@@ -1311,16 +1366,16 @@ Interpreter.prototype.initDate = function(scope) {
 
 /**
  * Initialize Regular Expression object.
- * @param {!Interpreter.Object} scope Global scope.
+ * @param {!Interpreter.MyObject} scope Global scope.
  */
-Interpreter.prototype.initRegExp = function(scope) {
+public initRegExp(scope: Interpreter.MyObject) {
   var thisInterpreter = this;
   var wrapper;
   // RegExp constructor.
   wrapper = function(pattern, flags) {
     if (thisInterpreter.calledWithNew()) {
       // Called as new RegExp().
-      var rgx = this;
+      var rgx = <Interpreter.MyObject>this;
     } else {
       // Called as RegExp().
       var rgx = thisInterpreter.createObjectProto(thisInterpreter.REGEXP_PROTO);
@@ -1374,15 +1429,15 @@ Interpreter.prototype.initRegExp = function(scope) {
 
 /**
  * Initialize the Error class.
- * @param {!Interpreter.Object} scope Global scope.
+ * @param {!Interpreter.MyObject} scope Global scope.
  */
-Interpreter.prototype.initError = function(scope) {
+public initError(scope: Interpreter.MyObject) {
   var thisInterpreter = this;
   // Error constructor.
   this.ERROR = this.createNativeFunction(function(opt_message) {
     if (thisInterpreter.calledWithNew()) {
       // Called as new Error().
-      var newError = this;
+      var newError = <Interpreter.MyObject>this;
     } else {
       // Called as Error().
       var newError = thisInterpreter.createObject(thisInterpreter.ERROR);
@@ -1404,7 +1459,7 @@ Interpreter.prototype.initError = function(scope) {
         function(opt_message) {
           if (thisInterpreter.calledWithNew()) {
             // Called as new XyzError().
-            var newError = this;
+            var newError = <Interpreter.MyObject>this;
           } else {
             // Called as XyzError().
             var newError = thisInterpreter.createObject(constructor);
@@ -1434,9 +1489,9 @@ Interpreter.prototype.initError = function(scope) {
 
 /**
  * Initialize Math object.
- * @param {!Interpreter.Object} scope Global scope.
+ * @param {!Interpreter.MyObject} scope Global scope.
  */
-Interpreter.prototype.initMath = function(scope) {
+public initMath(scope: Interpreter.MyObject) {
   var thisInterpreter = this;
   var myMath = this.createObjectProto(this.OBJECT_PROTO);
   this.setProperty(scope, 'Math', myMath);
@@ -1458,9 +1513,9 @@ Interpreter.prototype.initMath = function(scope) {
 
 /**
  * Initialize JSON object.
- * @param {!Interpreter.Object} scope Global scope.
+ * @param {!Interpreter.MyObject} scope Global scope.
  */
-Interpreter.prototype.initJSON = function(scope) {
+public initJSON(scope: Interpreter.MyObject) {
   var thisInterpreter = this;
   var myJSON = thisInterpreter.createObjectProto(this.OBJECT_PROTO);
   this.setProperty(scope, 'JSON', myJSON);
@@ -1490,12 +1545,12 @@ Interpreter.prototype.initJSON = function(scope) {
 
 /**
  * Is an object of a certain class?
- * @param {Interpreter.Value} child Object to check.
- * @param {Interpreter.Object} constructor Constructor of object.
+ * @param {Interpreter.MyValue} child Object to check.
+ * @param {Interpreter.MyObject} constructor Constructor of object.
  * @return {boolean} True if object is the class or inherits from it.
  *     False otherwise.
  */
-Interpreter.prototype.isa = function(child, constructor) {
+public isa(child: Interpreter.MyValue, constructor: Interpreter.MyObject) {
   if (child === null || child === undefined || !constructor) {
     return false;
   }
@@ -1505,166 +1560,59 @@ Interpreter.prototype.isa = function(child, constructor) {
   }
   // The first step up the prototype chain is harder since the child might be
   // a primitive value.  Subsequent steps can just follow the .proto property.
-  child = this.getPrototype(child);
-  while (child) {
-    if (child === proto) {
+  var childObj = this.getPrototype(child);
+  while (childObj) {
+    if (childObj === proto) {
       return true;
     }
-    child = child.proto;
+    childObj = childObj.proto;
   }
   return false;
 };
 
 /**
  * Is a value a legal integer for an array length?
- * @param {Interpreter.Value} x Value to check.
+ * @param {Interpreter.MyValue} x Value to check.
  * @return {number} Zero, or a positive integer if the value can be
  *     converted to such.  NaN otherwise.
  */
-Interpreter.legalArrayLength = function(x) {
-  var n = x >>> 0;
+static legalArrayLength(x: Interpreter.MyValue) {
+  var n = <number>x >>> 0;
   // Array length must be between 0 and 2^32-1 (inclusive).
   return (n === Number(x)) ? n : NaN;
 };
 
 /**
  * Is a value a legal integer for an array index?
- * @param {Interpreter.Value} x Value to check.
+ * @param {Interpreter.MyValue} x Value to check.
  * @return {number} Zero, or a positive integer if the value can be
  *     converted to such.  NaN otherwise.
  */
-Interpreter.legalArrayIndex = function(x) {
-  var n = x >>> 0;
+static legalArrayIndex(x: Interpreter.MyValue) {
+  var n = <number>x >>> 0;
   // Array index cannot be 2^32-1, otherwise length would be 2^32.
   // 0xffffffff is 2^32-1.
   return (String(n) === String(x) && n !== 0xffffffff) ? n : NaN;
 };
 
-/**
- * Typedef for JS values.
- * @typedef {!Interpreter.Object|boolean|number|string|undefined|null}
- */
-Interpreter.Value;
-
-/**
- * Class for an object.
- * @param {Interpreter.Object} proto Prototype object or null.
- * @constructor
- */
-Interpreter.Object = function(proto) {
-  this.getter = Object.create(null);
-  this.setter = Object.create(null);
-  this.properties = Object.create(null);
-  this.proto = proto;
-};
-
-/** @type {Interpreter.Object} */
-Interpreter.Object.prototype.proto = null;
-
-/** @type {boolean} */
-Interpreter.Object.prototype.isObject = true;
-
-/** @type {string} */
-Interpreter.Object.prototype.class = 'Object';
-
-/** @type {Date|RegExp|boolean|number|string|undefined|null} */
-Interpreter.Object.prototype.data = null;
-
-/**
- * Convert this object into a string.
- * @return {string} String value.
- * @override
- */
-Interpreter.Object.prototype.toString = function() {
-  if (this.class === 'Array') {
-    // Array
-    var cycles = Interpreter.toStringCycles_;
-    cycles.push(this);
-    try {
-      var strs = [];
-      for (var i = 0; i < this.properties.length; i++) {
-        var value = this.properties[i];
-        strs[i] = (value && value.isObject && cycles.indexOf(value) !== -1) ?
-            '...' : value;
-      }
-    } finally {
-      cycles.pop();
-    }
-    return strs.join(',');
-  }
-  if (this.class === 'Error') {
-    var cycles = Interpreter.toStringCycles_;
-    if (cycles.indexOf(this) !== -1) {
-      return '[object Error]';
-    }
-    var name, message;
-    // Bug: Does not support getters and setters for name or message.
-    var obj = this;
-    do {
-      if ('name' in obj.properties) {
-        name = obj.properties['name'];
-        break;
-      }
-    } while ((obj = obj.proto));
-    var obj = this;
-    do {
-      if ('message' in obj.properties) {
-        message = obj.properties['message'];
-        break;
-      }
-    } while ((obj = obj.proto));
-    cycles.push(this);
-    try {
-      name = name && name.toString();
-      message = message && message.toString();
-    } finally {
-      cycles.pop();
-    }
-    return message ? name + ': ' + message : String(name);
-  }
-
-  // RegExp, Date, and boxed primitives.
-  if (this.data !== null) {
-    return String(this.data);
-  }
-
-  return '[object ' + this.class + ']';
-};
-
-/**
- * Return the object's value.
- * @return {Interpreter.Value} Value.
- * @override
- */
-Interpreter.Object.prototype.valueOf = function() {
-  if (this.data === undefined || this.data === null ||
-      this.data instanceof RegExp) {
-    return this; // An Object.
-  }
-  if (this.data instanceof Date) {
-    return this.data.valueOf();  // Milliseconds.
-  }
-  return /** @type {(boolean|number|string)} */ (this.data);  // Boxed primitive.
-};
-
 /**
  * Create a new data object based on a constructor's prototype.
- * @param {Interpreter.Object} constructor Parent constructor function,
+ * @param {Interpreter.MyObject} constructor Parent constructor function,
  *     or null if scope object.
- * @return {!Interpreter.Object} New data object.
+ * @return {!Interpreter.MyObject} New data object.
  */
-Interpreter.prototype.createObject = function(constructor) {
+public createObject(constructor: Interpreter.MyObject) {
   return this.createObjectProto(constructor &&
                                 constructor.properties['prototype']);
 };
 
 /**
  * Create a new data object based on a prototype.
- * @param {Interpreter.Object} proto Prototype object.
- * @return {!Interpreter.Object} New data object.
+ * @param {Interpreter.MyObject} proto Prototype object.
+ * @return {!Interpreter.MyObject} New data object.
  */
-Interpreter.prototype.createObjectProto = function(proto) {
-  var obj = new Interpreter.Object(proto);
+public createObjectProto(proto: Interpreter.MyObject) {
+  var obj = new Interpreter.MyObject(proto);
   // Functions have prototype objects.
   if (this.isa(obj, this.FUNCTION)) {
     this.setProperty(obj, 'prototype',
@@ -1686,10 +1634,10 @@ Interpreter.prototype.createObjectProto = function(proto) {
 /**
  * Initialize a pseudo regular expression object based on a native regular
  * expression object.
- * @param {!Interpreter.Object} pseudoRegexp The existing object to set.
+ * @param {!Interpreter.MyObject} pseudoRegexp The existing object to set.
  * @param {!RegExp} nativeRegexp The native regular expression.
  */
-Interpreter.prototype.populateRegExp = function(pseudoRegexp, nativeRegexp) {
+public populateRegExp(pseudoRegexp: Interpreter.MyObject, nativeRegexp: RegExp) {
   pseudoRegexp.data = nativeRegexp;
   // lastIndex is settable, all others are read-only attributes
   this.setProperty(pseudoRegexp, 'lastIndex', nativeRegexp.lastIndex,
@@ -1708,9 +1656,9 @@ Interpreter.prototype.populateRegExp = function(pseudoRegexp, nativeRegexp) {
  * Create a new function.
  * @param {!Object} node AST node defining the function.
  * @param {!Object} scope Parent scope.
- * @return {!Interpreter.Object} New function.
+ * @return {!Interpreter.MyObject} New function.
  */
-Interpreter.prototype.createFunction = function(node, scope) {
+public createFunction(node: ESTree.FunctionDeclaration, scope: Interpreter.MyObject) {
   var func = this.createObjectProto(this.FUNCTION_PROTO);
   func.parentScope = scope;
   func.node = node;
@@ -1726,10 +1674,9 @@ Interpreter.prototype.createFunction = function(node, scope) {
  * prototype will have its constructor property set to the function.
  * If false, the function cannot be called as a constructor (e.g. escape).
  * Defaults to undefined.
- * @return {!Interpreter.Object} New function.
+ * @return {!Interpreter.MyObject} New function.
  */
-Interpreter.prototype.createNativeFunction =
-    function(nativeFunc, opt_constructor) {
+public createNativeFunction(nativeFunc: Interpreter.NativeFunction, opt_constructor?: boolean) {
   var func = this.createObjectProto(this.FUNCTION_PROTO);
   func.nativeFunc = nativeFunc;
   nativeFunc.id = this.functionCounter_++;
@@ -1748,9 +1695,9 @@ Interpreter.prototype.createNativeFunction =
 /**
  * Create a new native asynchronous function.
  * @param {!Function} asyncFunc JavaScript function.
- * @return {!Interpreter.Object} New function.
+ * @return {!Interpreter.MyObject} New function.
  */
-Interpreter.prototype.createAsyncFunction = function(asyncFunc) {
+public createAsyncFunction(asyncFunc) {
   var func = this.createObjectProto(this.FUNCTION_PROTO);
   func.asyncFunc = asyncFunc;
   asyncFunc.id = this.functionCounter_++;
@@ -1763,9 +1710,9 @@ Interpreter.prototype.createAsyncFunction = function(asyncFunc) {
  * Converts from a native JS object or value to a JS interpreter object.
  * Can handle JSON-style values.
  * @param {*} nativeObj The native JS object to be converted.
- * @return {Interpreter.Value} The equivalent JS interpreter object.
+ * @return {Interpreter.MyValue} The equivalent JS interpreter object.
  */
-Interpreter.prototype.nativeToPseudo = function(nativeObj) {
+public nativeToPseudo(nativeObj: any): Interpreter.MyValue {
   if (typeof nativeObj === 'boolean' ||
       typeof nativeObj === 'number' ||
       typeof nativeObj === 'string' ||
@@ -1794,7 +1741,7 @@ Interpreter.prototype.nativeToPseudo = function(nativeObj) {
     return this.createNativeFunction(wrapper, undefined);
   }
 
-  var pseudoObj;
+  var pseudoObj: Interpreter.MyObject;
   if (Array.isArray(nativeObj)) {  // Array.
     pseudoObj = this.createObjectProto(this.ARRAY_PROTO);
     for (var i = 0; i < nativeObj.length; i++) {
@@ -1814,12 +1761,12 @@ Interpreter.prototype.nativeToPseudo = function(nativeObj) {
 /**
  * Converts from a JS interpreter object to native JS object.
  * Can handle JSON-style values, plus cycles.
- * @param {Interpreter.Value} pseudoObj The JS interpreter object to be
+ * @param {Interpreter.MyValue} pseudoObj The JS interpreter object to be
  * converted.
  * @param {Object=} opt_cycles Cycle detection (used in recursive calls).
  * @return {*} The equivalent native JS object or value.
  */
-Interpreter.prototype.pseudoToNative = function(pseudoObj, opt_cycles) {
+public pseudoToNative(pseudoObj: Interpreter.MyValue, opt_cycles?: Interpreter.MyValueTable) {
   if (typeof pseudoObj === 'boolean' ||
       typeof pseudoObj === 'number' ||
       typeof pseudoObj === 'string' ||
@@ -1867,10 +1814,10 @@ Interpreter.prototype.pseudoToNative = function(pseudoObj, opt_cycles) {
 
 /**
  * Look up the prototype for this value.
- * @param {Interpreter.Value} value Data object.
- * @return {Interpreter.Object} Prototype object, null if none.
+ * @param {Interpreter.MyValue} value Data object.
+ * @return {Interpreter.MyObject} Prototype object, null if none.
  */
-Interpreter.prototype.getPrototype = function(value) {
+public getPrototype(value: Interpreter.MyValue): Interpreter.MyObject {
   switch (typeof value) {
     case 'number':
       return this.NUMBER.properties['prototype'];
@@ -1880,18 +1827,18 @@ Interpreter.prototype.getPrototype = function(value) {
       return this.STRING.properties['prototype'];
   }
   if (value) {
-    return value.proto;
+    return (<Interpreter.MyObject>value).proto;
   }
   return null;
 };
 
 /**
  * Fetch a property value from a data object.
- * @param {Interpreter.Value} obj Data object.
- * @param {Interpreter.Value} name Name of property.
- * @return {Interpreter.Value} Property value (may be undefined).
+ * @param {Interpreter.MyValue} obj Data object.
+ * @param {Interpreter.MyValue} name Name of property.
+ * @return {Interpreter.MyValue} Property value (may be undefined).
  */
-Interpreter.prototype.getProperty = function(obj, name) {
+public getProperty(obj: Interpreter.MyValue, name: Interpreter.MyValue): Interpreter.MyValue {
   name = String(name);
   if (obj === undefined || obj === null) {
     this.throwException(this.TYPE_ERROR,
@@ -1913,15 +1860,16 @@ Interpreter.prototype.getProperty = function(obj, name) {
     }
   }
   do {
-    if (obj.properties && name in obj.properties) {
-      var getter = obj.getter[name];
+    const myObj = <Interpreter.MyObject>obj;
+    if (myObj.properties && name in myObj.properties) {
+      var getter = myObj.getter[name];
       if (getter) {
         // Flag this function as being a getter and thus needing immediate
         // execution (rather than being the value of the property).
         getter.isGetter = true;
         return getter;
       }
-      return obj.properties[name];
+      return myObj.properties[name];
     }
   } while ((obj = this.getPrototype(obj)));
   return undefined;
@@ -1929,12 +1877,12 @@ Interpreter.prototype.getProperty = function(obj, name) {
 
 /**
  * Does the named property exist on a data object.
- * @param {Interpreter.Value} obj Data object.
- * @param {Interpreter.Value} name Name of property.
+ * @param {Interpreter.MyValue} obj Data object.
+ * @param {Interpreter.MyValue} name Name of property.
  * @return {boolean} True if property exists.
  */
-Interpreter.prototype.hasProperty = function(obj, name) {
-  if (!obj.isObject) {
+public hasProperty(obj: Interpreter.MyValue, name: Interpreter.MyValue) {
+  if (!obj['isObject']) {
     throw TypeError('Primitive data type has no properties');
   }
   name = String(name);
@@ -1948,7 +1896,8 @@ Interpreter.prototype.hasProperty = function(obj, name) {
     }
   }
   do {
-    if (obj.properties && name in obj.properties) {
+    const myObj = <Interpreter.MyObject> obj;
+    if (myObj.properties && name in myObj.properties) {
       return true;
     }
   } while ((obj = this.getPrototype(obj)));
@@ -1957,15 +1906,15 @@ Interpreter.prototype.hasProperty = function(obj, name) {
 
 /**
  * Set a property value on a data object.
- * @param {!Interpreter.Object} obj Data object.
- * @param {Interpreter.Value} name Name of property.
- * @param {Interpreter.Value|ReferenceError} value New property value.
+ * @param {!Interpreter.MyObject} obj Data object.
+ * @param {Interpreter.MyValue} name Name of property.
+ * @param {Interpreter.MyValue|ReferenceError} value New property value.
  *   Use ReferenceError if value is handled by descriptor instead.
  * @param {Object=} opt_descriptor Optional descriptor object.
- * @return {!Interpreter.Object|undefined} Returns a setter function if one
+ * @return {!Interpreter.MyObject|undefined} Returns a setter function if one
  *     needs to be called, otherwise undefined.
  */
-Interpreter.prototype.setProperty = function(obj, name, value, opt_descriptor) {
+public setProperty(obj: Interpreter.MyObject, name: Interpreter.MyValue, value: Interpreter.MyValue | ReferenceErrorConstructor, opt_descriptor?): Interpreter.MyObject {
   name = String(name);
   if (obj === undefined || obj === null) {
     this.throwException(this.TYPE_ERROR,
@@ -2001,7 +1950,7 @@ Interpreter.prototype.setProperty = function(obj, name, value, opt_descriptor) {
     var i;
     if (name === 'length') {
       // Delete elements if length is smaller.
-      var value = Interpreter.legalArrayLength(value);
+      value = Interpreter.legalArrayLength(<number>value);
       if (isNaN(value)) {
         this.throwException(this.RANGE_ERROR, 'Invalid array length');
       }
@@ -2041,7 +1990,7 @@ Interpreter.prototype.setProperty = function(obj, name, value, opt_descriptor) {
         delete obj.setter[name];
       }
     }
-    var descriptor = {};
+    var descriptor: Interpreter.MyDescriptor = {};
     if ('configurable' in opt_descriptor) {
       descriptor.configurable = opt_descriptor.configurable;
     }
@@ -2063,7 +2012,7 @@ Interpreter.prototype.setProperty = function(obj, name, value, opt_descriptor) {
       delete obj.setter[name];
     }
     try {
-      Object.defineProperty(obj.properties, name, descriptor);
+      Object.defineProperty(obj.properties, name, <any>descriptor);
     } catch (e) {
       this.throwException(this.TYPE_ERROR, 'Cannot redefine property: ' + name);
     }
@@ -2107,12 +2056,11 @@ Interpreter.prototype.setProperty = function(obj, name, value, opt_descriptor) {
 /**
  * Convenience method for adding a native function as a non-enumerable property
  * onto an object's prototype.
- * @param {!Interpreter.Object} obj Data object.
- * @param {Interpreter.Value} name Name of property.
+ * @param {!Interpreter.MyObject} obj Data object.
+ * @param {Interpreter.MyValue} name Name of property.
  * @param {!Function} wrapper Function object.
  */
-Interpreter.prototype.setNativeFunctionPrototype =
-    function(obj, name, wrapper) {
+private setNativeFunctionPrototype(obj: Interpreter.MyObject, name: Interpreter.MyValue, wrapper: Function) {
   this.setProperty(obj.properties['prototype'], name,
       this.createNativeFunction(wrapper, false),
       Interpreter.NONENUMERABLE_DESCRIPTOR);
@@ -2120,9 +2068,9 @@ Interpreter.prototype.setNativeFunctionPrototype =
 
 /**
  * Returns the current scope from the stateStack.
- * @return {!Interpreter.Object} Current scope dictionary.
+ * @return {!Interpreter.MyObject} Current scope dictionary.
  */
-Interpreter.prototype.getScope = function() {
+public getScope() {
   var scope = this.stateStack[this.stateStack.length - 1].scope;
   if (!scope) {
     throw Error('No scope found.');
@@ -2134,10 +2082,10 @@ Interpreter.prototype.getScope = function() {
  * Create a new scope dictionary.
  * @param {!Object} node AST node defining the scope container
  *     (e.g. a function).
- * @param {Interpreter.Object} parentScope Scope to link to.
- * @return {!Interpreter.Object} New scope.
+ * @param {Interpreter.MyObject} parentScope Scope to link to.
+ * @return {!Interpreter.MyObject} New scope.
  */
-Interpreter.prototype.createScope = function(node, parentScope) {
+public createScope(node: ESTree.Node, parentScope: Interpreter.MyObject) {
   var scope = this.createObjectProto(null);
   scope.parentScope = parentScope;
   if (!parentScope) {
@@ -2164,12 +2112,12 @@ Interpreter.prototype.createScope = function(node, parentScope) {
  * Create a new special scope dictionary. Similar to createScope(), but
  * doesn't assume that the scope is for a function body.
  * This is used for 'catch' clauses and 'with' statements.
- * @param {!Interpreter.Object} parentScope Scope to link to.
- * @param {Interpreter.Object=} opt_scope Optional object to transform into
+ * @param {!Interpreter.MyObject} parentScope Scope to link to.
+ * @param {Interpreter.MyObject=} opt_scope Optional object to transform into
  *     scope.
- * @return {!Interpreter.Object} New scope.
+ * @return {!Interpreter.MyObject} New scope.
  */
-Interpreter.prototype.createSpecialScope = function(parentScope, opt_scope) {
+public createSpecialScope(parentScope: Interpreter.MyObject, opt_scope?: Interpreter.MyObject) {
   if (!parentScope) {
     throw Error('parentScope required');
   }
@@ -2182,11 +2130,11 @@ Interpreter.prototype.createSpecialScope = function(parentScope, opt_scope) {
 /**
  * Retrieves a value from the scope chain.
  * @param {string} name Name of variable.
- * @return {Interpreter.Value} Any value.
+ * @return {Interpreter.MyValue} Any value.
  *   May be flagged as being a getter and thus needing immediate execution
  *   (rather than being the value of the property).
  */
-Interpreter.prototype.getValueFromScope = function(name) {
+public getValueFromScope(name: string): Interpreter.MyValue {
   var scope = this.getScope();
   while (scope && scope !== this.global) {
     if (name in scope.properties) {
@@ -2211,11 +2159,11 @@ Interpreter.prototype.getValueFromScope = function(name) {
 /**
  * Sets a value to the current scope.
  * @param {string} name Name of variable.
- * @param {Interpreter.Value} value Value.
- * @return {!Interpreter.Object|undefined} Returns a setter function if one
+ * @param {Interpreter.MyValue} value Value.
+ * @return {!Interpreter.MyObject|undefined} Returns a setter function if one
  *     needs to be called, otherwise undefined.
  */
-Interpreter.prototype.setValueToScope = function(name, value) {
+public setValueToScope(name: string, value: Interpreter.MyValue) {
   var scope = this.getScope();
   var strict = scope.strict;
   while (scope && scope !== this.global) {
@@ -2236,10 +2184,10 @@ Interpreter.prototype.setValueToScope = function(name, value) {
 /**
  * Create a new scope for the given node.
  * @param {!Object} node AST node (program or function).
- * @param {!Interpreter.Object} scope Scope dictionary to populate.
+ * @param {!Interpreter.MyObject} scope Scope dictionary to populate.
  * @private
  */
-Interpreter.prototype.populateScope_ = function(node, scope) {
+public populateScope_(node: ESTree.Node, scope: Interpreter.MyObject) {
   if (node['type'] === 'VariableDeclaration') {
     for (var i = 0; i < node['declarations'].length; i++) {
       this.setProperty(scope, node['declarations'][i]['id']['name'],
@@ -2247,7 +2195,7 @@ Interpreter.prototype.populateScope_ = function(node, scope) {
     }
   } else if (node['type'] === 'FunctionDeclaration') {
     this.setProperty(scope, node['id']['name'],
-        this.createFunction(node, scope), Interpreter.VARIABLE_DESCRIPTOR);
+        this.createFunction(<ESTree.FunctionDeclaration>node, scope), Interpreter.VARIABLE_DESCRIPTOR);
     return;  // Do not recurse into function.
   } else if (node['type'] === 'FunctionExpression') {
     return;  // Do not recurse into function.
@@ -2282,7 +2230,7 @@ Interpreter.prototype.populateScope_ = function(node, scope) {
  * @param {number=} end Ending character of all nodes, or undefined.
  * @private
  */
-Interpreter.prototype.stripLocations_ = function(node, start, end) {
+private stripLocations_(node: ESTree.BaseNode, start: number, end: number) {
   if (start) {
     node['start'] = start;
   } else {
@@ -2307,18 +2255,18 @@ Interpreter.prototype.stripLocations_ = function(node, start, end) {
  * Is the current state directly being called with as a construction with 'new'.
  * @return {boolean} True if 'new foo()', false if 'foo()'.
  */
-Interpreter.prototype.calledWithNew = function() {
+public calledWithNew(): boolean {
   return this.stateStack[this.stateStack.length - 1].isConstructor;
 };
 
 /**
  * Gets a value from the scope chain or from an object property.
  * @param {!Array} ref Name of variable or object/propname tuple.
- * @return {Interpreter.Value} Any value.
+ * @return {Interpreter.MyValue} Any value.
  *   May be flagged as being a getter and thus needing immediate execution
  *   (rather than being the value of the property).
  */
-Interpreter.prototype.getValue = function(ref) {
+public getValue(ref) {
   if (ref[0] === Interpreter.SCOPE_REFERENCE) {
     // A null/varname variable lookup.
     return this.getValueFromScope(ref[1]);
@@ -2331,11 +2279,11 @@ Interpreter.prototype.getValue = function(ref) {
 /**
  * Sets a value to the scope chain or to an object property.
  * @param {!Array} ref Name of variable or object/propname tuple.
- * @param {Interpreter.Value} value Value.
- * @return {!Interpreter.Object|undefined} Returns a setter function if one
+ * @param {Interpreter.MyValue} value Value.
+ * @return {!Interpreter.MyObject|undefined} Returns a setter function if one
  *     needs to be called, otherwise undefined.
  */
-Interpreter.prototype.setValue = function(ref, value) {
+public setValue(ref: Array<any> & { 0: Interpreter.MyObject, 1: string }, value: Interpreter.MyValue) {
   if (ref[0] === Interpreter.SCOPE_REFERENCE) {
     // A null/varname variable lookup.
     return this.setValueToScope(ref[1], value);
@@ -2350,13 +2298,13 @@ Interpreter.prototype.setValue = function(ref, value) {
  * interpreter try/catch statement.  If unhandled, a real exception will
  * be thrown.  Can be called with either an error class and a message, or
  * with an actual object to be thrown.
- * @param {!Interpreter.Object} errorClass Type of error (if message is
+ * @param {!Interpreter.MyObject} errorClass Type of error (if message is
  *   provided) or the value to throw (if no message).
  * @param {string=} opt_message Message being thrown.
  */
-Interpreter.prototype.throwException = function(errorClass, opt_message) {
+public throwException(errorClass: Interpreter.MyObject, opt_message?: string) {
   if (opt_message === undefined) {
-    var error = errorClass;  // This is a value to throw, not an error class.
+    var error = <Interpreter.MyObject>errorClass;  // This is a value to throw, not an error class.
   } else {
     var error = this.createObject(errorClass);
     this.setProperty(error, 'message', opt_message,
@@ -2371,10 +2319,11 @@ Interpreter.prototype.throwException = function(errorClass, opt_message) {
  * Throw an exception in the interpreter that can be handled by a
  * interpreter try/catch statement.  If unhandled, a real exception will
  * be thrown.
- * @param {!Interpreter.Object} error Error object to execute.
+ * @param {!Interpreter.MyObject} error Error object to execute.
  */
-Interpreter.prototype.executeException = function(error) {
+public executeException(error: Interpreter.MyObject) {
   // Search for a try statement.
+  const stateStack = this.stateStack.slice();
   do {
     this.stateStack.pop();
     var state = this.stateStack[this.stateStack.length - 1];
@@ -2402,23 +2351,24 @@ Interpreter.prototype.executeException = function(error) {
   } else {
     realError = String(error);
   }
+  this.stateStack = stateStack; // recover the original state stack
   throw realError;
 };
 
 /**
  * Create a call to a getter function.
- * @param {!Interpreter.Object} func Function to execute.
- * @param {!Interpreter.Object|!Array} left
+ * @param {!Interpreter.MyObject} func Function to execute.
+ * @param {!Interpreter.MyObject|!Array} left
  *     Name of variable or object/propname tuple.
  * @private
  */
-Interpreter.prototype.createGetter_ = function(func, left) {
+public createGetter_(func: Interpreter.MyObject, left: Interpreter.MyObject | Array<Interpreter.MyObject>) {
   // Normally 'this' will be specified as the object component (o.x).
   // Sometimes 'this' is explicitly provided (o).
   var funcThis = Array.isArray(left) ? left[0] : left;
   var node = new this.nodeConstructor();
   node['type'] = 'CallExpression';
-  var state = new Interpreter.State(node,
+  var state = new Interpreter.MyState(node,
       this.stateStack[this.stateStack.length - 1].scope);
   state.doneCallee_ = true;
   state.funcThis_ = funcThis;
@@ -2430,19 +2380,19 @@ Interpreter.prototype.createGetter_ = function(func, left) {
 
 /**
  * Create a call to a setter function.
- * @param {!Interpreter.Object} func Function to execute.
- * @param {!Interpreter.Object|!Array} left
+ * @param {!Interpreter.MyObject} func Function to execute.
+ * @param {!Interpreter.MyObject|!Array} left
  *     Name of variable or object/propname tuple.
- * @param {Interpreter.Value} value Value to set.
+ * @param {Interpreter.MyValue} value Value to set.
  * @private
  */
-Interpreter.prototype.createSetter_ = function(func, left, value) {
+public createSetter_(func: Interpreter.MyObject, left: Interpreter.MyObject | Array<Interpreter.MyObject>, value: Interpreter.MyValue) {
   // Normally 'this' will be specified as the object component (o.x).
   // Sometimes 'this' is implicitly the global object (x).
   var funcThis = Array.isArray(left) ? left[0] : this.global;
   var node = new this.nodeConstructor();
   node['type'] = 'CallExpression';
-  var state = new Interpreter.State(node,
+  var state = new Interpreter.MyState(node,
       this.stateStack[this.stateStack.length - 1].scope);
   state.doneCallee_ = true;
   state.funcThis_ = funcThis;
@@ -2452,23 +2402,12 @@ Interpreter.prototype.createSetter_ = function(func, left, value) {
   return state;
 };
 
-/**
- * Class for a state.
- * @param {!Object} node AST node for the state.
- * @param {!Interpreter.Object} scope Scope object for the state.
- * @constructor
- */
-Interpreter.State = function(node, scope) {
-  this.node = node;
-  this.scope = scope;
-};
-
 
 ///////////////////////////////////////////////////////////////////////////////
 // Functions to handle each node type.
 ///////////////////////////////////////////////////////////////////////////////
 
-Interpreter.prototype['stepArrayExpression'] = function(stack, state, node) {
+private stepArrayExpression(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {
   var elements = node['elements'];
   var n = state.n_ || 0;
   if (!state.array_) {
@@ -2482,7 +2421,7 @@ Interpreter.prototype['stepArrayExpression'] = function(stack, state, node) {
     // Skip missing elements - they're not defined, not undefined.
     if (elements[n]) {
       state.n_ = n;
-      return new Interpreter.State(elements[n], state.scope);
+      return new Interpreter.MyState(elements[n], state.scope);
     }
     n++;
   }
@@ -2490,11 +2429,10 @@ Interpreter.prototype['stepArrayExpression'] = function(stack, state, node) {
   stack[stack.length - 1].value = state.array_;
 };
 
-Interpreter.prototype['stepAssignmentExpression'] =
-    function(stack, state, node) {
+private stepAssignmentExpression(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {
   if (!state.doneLeft_) {
     state.doneLeft_ = true;
-    var nextState = new Interpreter.State(node['left'], state.scope);
+    var nextState = new Interpreter.MyState(node['left'], state.scope);
     nextState.components = true;
     return nextState;
   }
@@ -2517,7 +2455,7 @@ Interpreter.prototype['stepAssignmentExpression'] =
       }
     }
     state.doneRight_ = true;
-    return new Interpreter.State(node['right'], state.scope);
+    return new Interpreter.MyState(node['right'], state.scope);
   }
   if (state.doneSetter_) {
     // Return if setter function.
@@ -2555,15 +2493,15 @@ Interpreter.prototype['stepAssignmentExpression'] =
   stack[stack.length - 1].value = value;
 };
 
-Interpreter.prototype['stepBinaryExpression'] = function(stack, state, node) {
+private stepBinaryExpression(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {
   if (!state.doneLeft_) {
     state.doneLeft_ = true;
-    return new Interpreter.State(node['left'], state.scope);
+    return new Interpreter.MyState(node['left'], state.scope);
   }
   if (!state.doneRight_) {
     state.doneRight_ = true;
     state.leftValue_ = state.value;
-    return new Interpreter.State(node['right'], state.scope);
+    return new Interpreter.MyState(node['right'], state.scope);
   }
   stack.pop();
   var leftValue = state.leftValue_;
@@ -2609,17 +2547,17 @@ Interpreter.prototype['stepBinaryExpression'] = function(stack, state, node) {
   stack[stack.length - 1].value = value;
 };
 
-Interpreter.prototype['stepBlockStatement'] = function(stack, state, node) {
+private stepBlockStatement(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {
   var n = state.n_ || 0;
   var expression = node['body'][n];
   if (expression) {
     state.n_ = n + 1;
-    return new Interpreter.State(expression, state.scope);
+    return new Interpreter.MyState(expression, state.scope);
   }
   stack.pop();
 };
 
-Interpreter.prototype['stepBreakStatement'] = function(stack, state, node) {
+private stepBreakStatement(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {
   stack.pop();
   var label = null;
   if (node['label']) {
@@ -2641,11 +2579,11 @@ Interpreter.prototype['stepBreakStatement'] = function(stack, state, node) {
   throw SyntaxError('Illegal break statement');
 };
 
-Interpreter.prototype['stepCallExpression'] = function(stack, state, node) {
+private stepCallExpression(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {
   if (!state.doneCallee_) {
     state.doneCallee_ = 1;
     // Components needed to determine value of 'this'.
-    var nextState = new Interpreter.State(node['callee'], state.scope);
+    var nextState = new Interpreter.MyState(node['callee'], state.scope);
     nextState.components = true;
     return nextState;
   }
@@ -2680,7 +2618,7 @@ Interpreter.prototype['stepCallExpression'] = function(stack, state, node) {
       state.arguments_.push(state.value);
     }
     if (node['arguments'][state.n_]) {
-      return new Interpreter.State(node['arguments'][state.n_++], state.scope);
+      return new Interpreter.MyState(node['arguments'][state.n_++], state.scope);
     }
     // Determine value of 'this' in function.
     if (node['type'] === 'NewExpression') {
@@ -2726,7 +2664,7 @@ Interpreter.prototype['stepCallExpression'] = function(stack, state, node) {
       this.setProperty(scope, 'this', state.funcThis_,
                        Interpreter.READONLY_DESCRIPTOR);
       state.value = undefined;  // Default value if no explicit return.
-      return new Interpreter.State(funcNode['body'], scope);
+      return new Interpreter.MyState(funcNode['body'], scope);
     } else if (func.eval) {
       var code = state.arguments_[0];
       if (typeof code !== 'string') {
@@ -2735,7 +2673,7 @@ Interpreter.prototype['stepCallExpression'] = function(stack, state, node) {
         state.value = code;
       } else {
         try {
-          var ast = acorn.parse(code.toString(), Interpreter.PARSE_OPTIONS);
+          var ast = Interpreter.acorn.parse(code.toString(), Interpreter.PARSE_OPTIONS);
         } catch (e) {
           // Acorn threw a SyntaxError.  Rethrow as a trappable error.
           this.throwException(this.SYNTAX_ERROR, 'Invalid code: ' + e.message);
@@ -2745,7 +2683,7 @@ Interpreter.prototype['stepCallExpression'] = function(stack, state, node) {
         evalNode['body'] = ast['body'];
         this.stripLocations_(evalNode, node['start'], node['end']);
         // Update current scope with definitions in eval().
-        var scope = state.scope;
+        var scope = <Interpreter.MyObject>state.scope;
         if (scope.strict) {
           // Strict mode get its own scope in eval.
           scope = this.createScope(ast, scope);
@@ -2754,7 +2692,7 @@ Interpreter.prototype['stepCallExpression'] = function(stack, state, node) {
           this.populateScope_(ast, scope);
         }
         this.value = undefined;  // Default value if no code.
-        return new Interpreter.State(evalNode, scope);
+        return new Interpreter.MyState(evalNode, scope);
       }
     } else if (func.nativeFunc) {
       state.value = func.nativeFunc.apply(state.funcThis_, state.arguments_);
@@ -2788,7 +2726,7 @@ Interpreter.prototype['stepCallExpression'] = function(stack, state, node) {
   }
 };
 
-Interpreter.prototype['stepCatchClause'] = function(stack, state, node) {
+private stepCatchClause(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {
   if (!state.done_) {
     state.done_ = true;
     // Create an empty scope.
@@ -2796,28 +2734,27 @@ Interpreter.prototype['stepCatchClause'] = function(stack, state, node) {
     // Add the argument.
     this.setProperty(scope, node['param']['name'], state.throwValue);
     // Execute catch clause.
-    return new Interpreter.State(node['body'], scope);
+    return new Interpreter.MyState(node['body'], scope);
   } else {
     stack.pop();
   }
 };
 
-Interpreter.prototype['stepConditionalExpression'] =
-    function(stack, state, node) {
+private stepConditionalExpression(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {
   var mode = state.mode_ || 0;
   if (mode === 0) {
     state.mode_ = 1;
-    return new Interpreter.State(node['test'], state.scope);
+    return new Interpreter.MyState(node['test'], state.scope);
   }
   if (mode === 1) {
     state.mode_ = 2;
     var value = Boolean(state.value);
     if (value && node['consequent']) {
       // Execute 'if' block.
-      return new Interpreter.State(node['consequent'], state.scope);
+      return new Interpreter.MyState(node['consequent'], state.scope);
     } else if (!value && node['alternate']) {
       // Execute 'else' block.
-      return new Interpreter.State(node['alternate'], state.scope);
+      return new Interpreter.MyState(node['alternate'], state.scope);
     }
     // eval('1;if(false){2}') -> undefined
     this.value = undefined;
@@ -2828,7 +2765,7 @@ Interpreter.prototype['stepConditionalExpression'] =
   }
 };
 
-Interpreter.prototype['stepContinueStatement'] = function(stack, state, node) {
+private stepContinueStatement(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {
   stack.pop();
   var label = null;
   if (node['label']) {
@@ -2850,12 +2787,12 @@ Interpreter.prototype['stepContinueStatement'] = function(stack, state, node) {
   throw SyntaxError('Illegal continue statement');
 };
 
-Interpreter.prototype['stepDebuggerStatement'] = function(stack, state, node) {
+private stepDebuggerStatement(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {
   // Do nothing.  May be overridden by developers.
   stack.pop();
 };
 
-Interpreter.prototype['stepDoWhileStatement'] = function(stack, state, node) {
+private stepDoWhileStatement(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {
   if (node['type'] === 'DoWhileStatement' && state.test_ === undefined) {
     // First iteration of do/while executes without checking test.
     state.value = true;
@@ -2863,36 +2800,36 @@ Interpreter.prototype['stepDoWhileStatement'] = function(stack, state, node) {
   }
   if (!state.test_) {
     state.test_ = true;
-    return new Interpreter.State(node['test'], state.scope);
+    return new Interpreter.MyState(node['test'], state.scope);
   }
   if (!state.value) {  // Done, exit loop.
     stack.pop();
   } else if (node['body']) {  // Execute the body.
     state.test_ = false;
     state.isLoop = true;
-    return new Interpreter.State(node['body'], state.scope);
+    return new Interpreter.MyState(node['body'], state.scope);
   }
 };
 
-Interpreter.prototype['stepEmptyStatement'] = function(stack, state, node) {
+private stepEmptyStatement(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {
   stack.pop();
 };
 
-Interpreter.prototype['stepEvalProgram_'] = function(stack, state, node) {
+private stepEvalProgram_(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {
   var n = state.n_ || 0;
   var expression = node['body'][n];
   if (expression) {
     state.n_ = n + 1;
-    return new Interpreter.State(expression, state.scope);
+    return new Interpreter.MyState(expression, state.scope);
   }
   stack.pop();
   stack[stack.length - 1].value = this.value;
 };
 
-Interpreter.prototype['stepExpressionStatement'] = function(stack, state, node) {
+private stepExpressionStatement(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {
   if (!state.done_) {
     state.done_ = true;
-    return new Interpreter.State(node['expression'], state.scope);
+    return new Interpreter.MyState(node['expression'], state.scope);
   }
   stack.pop();
   // Save this value to interpreter.value for use as a return value if
@@ -2900,7 +2837,7 @@ Interpreter.prototype['stepExpressionStatement'] = function(stack, state, node)
   this.value = state.value;
 };
 
-Interpreter.prototype['stepForInStatement'] = function(stack, state, node) {
+private stepForInStatement(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {
   // First, initialize a variable if exists.  Only do so once, ever.
   if (!state.doneInit_) {
     state.doneInit_ = true;
@@ -2911,7 +2848,7 @@ Interpreter.prototype['stepForInStatement'] = function(stack, state, node) {
             'for-in loop variable declaration may not have an initializer.');
       }
       // Variable initialization: for (var x = 4 in y)
-      return new Interpreter.State(node['left'], state.scope);
+      return new Interpreter.MyState(node['left'], state.scope);
     }
   }
   // Second, look up the object.  Only do so once, ever.
@@ -2920,7 +2857,7 @@ Interpreter.prototype['stepForInStatement'] = function(stack, state, node) {
     if (!state.variable_) {
       state.variable_ = state.value;
     }
-    return new Interpreter.State(node['right'], state.scope);
+    return new Interpreter.MyState(node['right'], state.scope);
   }
   if (!state.isLoop) {
     // First iteration.
@@ -2981,7 +2918,7 @@ Interpreter.prototype['stepForInStatement'] = function(stack, state, node) {
     } else {
       // Arbitrary left side: for (foo().bar in y)
       state.variable_ = null;
-      var nextState = new Interpreter.State(left, state.scope);
+      var nextState = new Interpreter.MyState(left, state.scope);
       nextState.components = true;
       return nextState;
     }
@@ -3005,21 +2942,21 @@ Interpreter.prototype['stepForInStatement'] = function(stack, state, node) {
   state.doneSetter_ = false;
   // Sixth and finally, execute the body if there was one.  this.
   if (node['body']) {
-    return new Interpreter.State(node['body'], state.scope);
+    return new Interpreter.MyState(node['body'], state.scope);
   }
 };
 
-Interpreter.prototype['stepForStatement'] = function(stack, state, node) {
+private stepForStatement(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {
   var mode = state.mode_ || 0;
   if (mode === 0) {
     state.mode_ = 1;
     if (node['init']) {
-      return new Interpreter.State(node['init'], state.scope);
+      return new Interpreter.MyState(node['init'], state.scope);
     }
   } else if (mode === 1) {
     state.mode_ = 2;
     if (node['test']) {
-      return new Interpreter.State(node['test'], state.scope);
+      return new Interpreter.MyState(node['test'], state.scope);
     }
   } else if (mode === 2) {
     state.mode_ = 3;
@@ -3028,28 +2965,27 @@ Interpreter.prototype['stepForStatement'] = function(stack, state, node) {
       stack.pop();
     } else {  // Execute the body.
       state.isLoop = true;
-      return new Interpreter.State(node['body'], state.scope);
+      return new Interpreter.MyState(node['body'], state.scope);
     }
   } else if (mode === 3) {
     state.mode_ = 1;
     if (node['update']) {
-      return new Interpreter.State(node['update'], state.scope);
+      return new Interpreter.MyState(node['update'], state.scope);
     }
   }
 };
 
-Interpreter.prototype['stepFunctionDeclaration'] =
-    function(stack, state, node) {
+private stepFunctionDeclaration(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {
   // This was found and handled when the scope was populated.
   stack.pop();
 };
 
-Interpreter.prototype['stepFunctionExpression'] = function(stack, state, node) {
+private stepFunctionExpression(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {
   stack.pop();
-  stack[stack.length - 1].value = this.createFunction(node, state.scope);
+  stack[stack.length - 1].value = this.createFunction(<ESTree.FunctionDeclaration>node, state.scope);
 };
 
-Interpreter.prototype['stepIdentifier'] = function(stack, state, node) {
+private stepIdentifier(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {
   stack.pop();
   if (state.components) {
     stack[stack.length - 1].value = [Interpreter.SCOPE_REFERENCE, node['name']];
@@ -3070,21 +3006,22 @@ Interpreter.prototype['stepIdentifier'] = function(stack, state, node) {
   stack[stack.length - 1].value = value;
 };
 
-Interpreter.prototype['stepIfStatement'] =
-    Interpreter.prototype['stepConditionalExpression'];
+private stepIfStatement(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {
+  return this.stepConditionalExpression(stack, state, node);
+}
 
-Interpreter.prototype['stepLabeledStatement'] = function(stack, state, node) {
+private stepLabeledStatement(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {
   // No need to hit this node again on the way back up the stack.
   stack.pop();
   // Note that a statement might have multiple labels.
   var labels = state.labels || [];
   labels.push(node['label']['name']);
-  var nextState = new Interpreter.State(node['body'], state.scope);
+  var nextState = new Interpreter.MyState(node['body'], state.scope);
   nextState.labels = labels;
   return nextState;
 };
 
-Interpreter.prototype['stepLiteral'] = function(stack, state, node) {
+private stepLiteral(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {
   stack.pop();
   var value = node['value'];
   if (value instanceof RegExp) {
@@ -3095,13 +3032,13 @@ Interpreter.prototype['stepLiteral'] = function(stack, state, node) {
   stack[stack.length - 1].value = value;
 };
 
-Interpreter.prototype['stepLogicalExpression'] = function(stack, state, node) {
+private stepLogicalExpression(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {
   if (node['operator'] !== '&&' && node['operator'] !== '||') {
     throw SyntaxError('Unknown logical operator: ' + node['operator']);
   }
   if (!state.doneLeft_) {
     state.doneLeft_ = true;
-    return new Interpreter.State(node['left'], state.scope);
+    return new Interpreter.MyState(node['left'], state.scope);
   }
   if (!state.doneRight_) {
     if ((node['operator'] === '&&' && !state.value) ||
@@ -3111,7 +3048,7 @@ Interpreter.prototype['stepLogicalExpression'] = function(stack, state, node) {
       stack[stack.length - 1].value = state.value;
     } else {
       state.doneRight_ = true;
-      return new Interpreter.State(node['right'], state.scope);
+      return new Interpreter.MyState(node['right'], state.scope);
     }
   } else {
     stack.pop();
@@ -3119,10 +3056,10 @@ Interpreter.prototype['stepLogicalExpression'] = function(stack, state, node) {
   }
 };
 
-Interpreter.prototype['stepMemberExpression'] = function(stack, state, node) {
+private stepMemberExpression(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {
   if (!state.doneObject_) {
     state.doneObject_ = true;
-    return new Interpreter.State(node['object'], state.scope);
+    return new Interpreter.MyState(node['object'], state.scope);
   }
   var propName;
   if (!node['computed']) {
@@ -3133,7 +3070,7 @@ Interpreter.prototype['stepMemberExpression'] = function(stack, state, node) {
     state.object_ = state.value;
     // obj[foo] -- Compute value of 'foo'.
     state.doneProperty_ = true;
-    return new Interpreter.State(node['property'], state.scope);
+    return new Interpreter.MyState(node['property'], state.scope);
   } else {
     propName = state.value;
   }
@@ -3152,10 +3089,11 @@ Interpreter.prototype['stepMemberExpression'] = function(stack, state, node) {
   }
 };
 
-Interpreter.prototype['stepNewExpression'] =
-    Interpreter.prototype['stepCallExpression'];
+private stepNewExpression(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {
+  return this.stepCallExpression(stack, state, node);
+}
 
-Interpreter.prototype['stepObjectExpression'] = function(stack, state, node) {
+private stepObjectExpression(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {
   var n = state.n_ || 0;
   var property = node['properties'][n];
   if (!state.object_) {
@@ -3164,7 +3102,7 @@ Interpreter.prototype['stepObjectExpression'] = function(stack, state, node) {
     state.properties_ = Object.create(null);
   } else {
     // Determine property name.
-    var key = property['key'];
+    var key = <string>property['key'];
     if (key['type'] === 'Identifier') {
       var propName = key['name'];
     } else if (key['type'] === 'Literal') {
@@ -3182,7 +3120,7 @@ Interpreter.prototype['stepObjectExpression'] = function(stack, state, node) {
     property = node['properties'][n];
   }
   if (property) {
-    return new Interpreter.State(property['value'], state.scope);
+    return new Interpreter.MyState(property['value'], state.scope);
   }
   for (var key in state.properties_) {
     var kinds = state.properties_[key];
@@ -3204,23 +3142,23 @@ Interpreter.prototype['stepObjectExpression'] = function(stack, state, node) {
   stack[stack.length - 1].value = state.object_;
 };
 
-Interpreter.prototype['stepProgram'] = function(stack, state, node) {
+private stepProgram(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {
   var n = state.n_ || 0;
   var expression = node['body'][n];
   if (expression) {
     state.done = false;
     state.n_ = n + 1;
-    return new Interpreter.State(expression, state.scope);
+    return new Interpreter.MyState(expression, state.scope);
   }
   state.done = true;
   // Don't pop the stateStack.
   // Leave the root scope on the tree in case the program is appended to.
 };
 
-Interpreter.prototype['stepReturnStatement'] = function(stack, state, node) {
+private stepReturnStatement(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {
   if (node['argument'] && !state.done_) {
     state.done_ = true;
-    return new Interpreter.State(node['argument'], state.scope);
+    return new Interpreter.MyState(node['argument'], state.scope);
   }
   var value = state.value;
   var i = stack.length - 1;
@@ -3240,21 +3178,21 @@ Interpreter.prototype['stepReturnStatement'] = function(stack, state, node) {
   state.value = value;
 };
 
-Interpreter.prototype['stepSequenceExpression'] = function(stack, state, node) {
+private stepSequenceExpression(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {
   var n = state.n_ || 0;
   var expression = node['expressions'][n];
   if (expression) {
     state.n_ = n + 1;
-    return new Interpreter.State(expression, state.scope);
+    return new Interpreter.MyState(expression, state.scope);
   }
   stack.pop();
   stack[stack.length - 1].value = state.value;
 };
 
-Interpreter.prototype['stepSwitchStatement'] = function(stack, state, node) {
+private stepSwitchStatement(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {
   if (!state.test_) {
     state.test_ = 1;
-    return new Interpreter.State(node['discriminant'], state.scope);
+    return new Interpreter.MyState(node['discriminant'], state.scope);
   }
   if (state.test_ === 1) {
     state.test_ = 2;
@@ -3281,7 +3219,7 @@ Interpreter.prototype['stepSwitchStatement'] = function(stack, state, node) {
     if (switchCase) {
       if (!state.matched_ && !state.tested_ && switchCase['test']) {
         state.tested_ = true;
-        return new Interpreter.State(switchCase['test'], state.scope);
+        return new Interpreter.MyState(switchCase['test'], state.scope);
       }
       if (state.matched_ || state.value === state.switchValue_) {
         state.matched_ = true;
@@ -3289,7 +3227,7 @@ Interpreter.prototype['stepSwitchStatement'] = function(stack, state, node) {
         if (switchCase['consequent'][n]) {
           state.isSwitch = true;
           state.n_ = n + 1;
-          return new Interpreter.State(switchCase['consequent'][n],
+          return new Interpreter.MyState(switchCase['consequent'][n],
                                        state.scope);
         }
       }
@@ -3304,35 +3242,35 @@ Interpreter.prototype['stepSwitchStatement'] = function(stack, state, node) {
   }
 };
 
-Interpreter.prototype['stepThisExpression'] = function(stack, state, node) {
+private stepThisExpression(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {
   stack.pop();
   stack[stack.length - 1].value = this.getValueFromScope('this');
 };
 
-Interpreter.prototype['stepThrowStatement'] = function(stack, state, node) {
+private stepThrowStatement(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {
   if (!state.done_) {
     state.done_ = true;
-    return new Interpreter.State(node['argument'], state.scope);
+    return new Interpreter.MyState(node['argument'], state.scope);
   } else {
     this.throwException(state.value);
   }
 };
 
-Interpreter.prototype['stepTryStatement'] = function(stack, state, node) {
+private stepTryStatement(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {
   if (!state.doneBlock_) {
     state.doneBlock_ = true;
-    return new Interpreter.State(node['block'], state.scope);
+    return new Interpreter.MyState(node['block'], state.scope);
   }
   if (state.throwValue && !state.doneHandler_ && node['handler']) {
     state.doneHandler_ = true;
-    var nextState = new Interpreter.State(node['handler'], state.scope);
+    var nextState = new Interpreter.MyState(node['handler'], state.scope);
     nextState.throwValue = state.throwValue;
     state.throwValue = null;  // This error has been handled, don't rethrow.
     return nextState;
   }
   if (!state.doneFinalizer_ && node['finalizer']) {
     state.doneFinalizer_ = true;
-    return new Interpreter.State(node['finalizer'], state.scope);
+    return new Interpreter.MyState(node['finalizer'], state.scope);
   }
   if (state.throwValue) {
     // There was no catch handler, or the catch/finally threw an error.
@@ -3343,10 +3281,10 @@ Interpreter.prototype['stepTryStatement'] = function(stack, state, node) {
   }
 };
 
-Interpreter.prototype['stepUnaryExpression'] = function(stack, state, node) {
+private stepUnaryExpression(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {
   if (!state.done_) {
     state.done_ = true;
-    var nextState = new Interpreter.State(node['argument'], state.scope);
+    var nextState = new Interpreter.MyState(node['argument'], state.scope);
     nextState.components = node['operator'] === 'delete';
     return nextState;
   }
@@ -3393,10 +3331,10 @@ Interpreter.prototype['stepUnaryExpression'] = function(stack, state, node) {
   stack[stack.length - 1].value = value;
 };
 
-Interpreter.prototype['stepUpdateExpression'] = function(stack, state, node) {
+private stepUpdateExpression(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {
   if (!state.doneLeft_) {
     state.doneLeft_ = true;
-    var nextState = new Interpreter.State(node['argument'], state.scope);
+    var nextState = new Interpreter.MyState(node['argument'], state.scope);
     nextState.components = true;
     return nextState;
   }
@@ -3425,7 +3363,7 @@ Interpreter.prototype['stepUpdateExpression'] = function(stack, state, node) {
     stack[stack.length - 1].value = state.doneSetter_;
     return;
   }
-  var leftValue = Number(state.leftValue_);
+  leftValue = Number(state.leftValue_);
   var changeValue;
   if (node['operator'] === '++') {
     changeValue = leftValue + 1;
@@ -3445,7 +3383,7 @@ Interpreter.prototype['stepUpdateExpression'] = function(stack, state, node) {
   stack[stack.length - 1].value = returnValue;
 };
 
-Interpreter.prototype['stepVariableDeclaration'] = function(stack, state, node) {
+private stepVariableDeclaration(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {
   var declarations = node['declarations'];
   var n = state.n_ || 0;
   var declarationNode = declarations[n];
@@ -3463,46 +3401,198 @@ Interpreter.prototype['stepVariableDeclaration'] = function(stack, state, node)
     if (declarationNode['init']) {
       state.n_ = n;
       state.init_ = true;
-      return new Interpreter.State(declarationNode['init'], state.scope);
+      return new Interpreter.MyState(declarationNode['init'], state.scope);
     }
     declarationNode = declarations[++n];
   }
   stack.pop();
 };
 
-Interpreter.prototype['stepWithStatement'] = function(stack, state, node) {
+private stepWithStatement(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {
   if (!state.doneObject_) {
     state.doneObject_ = true;
-    return new Interpreter.State(node['object'], state.scope);
+    return new Interpreter.MyState(node['object'], state.scope);
   } else if (!state.doneBody_) {
     state.doneBody_ = true;
     var scope = this.createSpecialScope(state.scope, state.value);
-    return new Interpreter.State(node['body'], scope);
+    return new Interpreter.MyState(node['body'], scope);
   } else {
     stack.pop();
   }
 };
 
-Interpreter.prototype['stepWhileStatement'] =
-    Interpreter.prototype['stepDoWhileStatement'];
-
-// Preserve top-level API functions from being pruned/renamed by JS compilers.
-// Add others as needed.
-// The global object ('window' in a browser, 'global' in node.js) is 'this'.
-this['Interpreter'] = Interpreter;
-Interpreter.prototype['step'] = Interpreter.prototype.step;
-Interpreter.prototype['run'] = Interpreter.prototype.run;
-Interpreter.prototype['appendCode'] = Interpreter.prototype.appendCode;
-Interpreter.prototype['createObject'] = Interpreter.prototype.createObject;
-Interpreter.prototype['createObjectProto'] =
-    Interpreter.prototype.createObjectProto;
-Interpreter.prototype['createAsyncFunction'] =
-    Interpreter.prototype.createAsyncFunction;
-Interpreter.prototype['createNativeFunction'] =
-    Interpreter.prototype.createNativeFunction;
-Interpreter.prototype['getProperty'] = Interpreter.prototype.getProperty;
-Interpreter.prototype['setProperty'] = Interpreter.prototype.setProperty;
-Interpreter.prototype['nativeToPseudo'] = Interpreter.prototype.nativeToPseudo;
-Interpreter.prototype['pseudoToNative'] = Interpreter.prototype.pseudoToNative;
-// Obsolete.  Do not use.
-Interpreter.prototype['createPrimitive'] = function(x) {return x;};
+private stepWhileStatement(stack: Interpreter.MyState[], state: Interpreter.MyState, node: ESTree.Node) {
+  return this.stepDoWhileStatement(stack, state, node);
+}
+}
+
+module Interpreter {
+/**
+ * Class for an object.
+ * @param {Interpreter.MyObject} proto Prototype object or null.
+ * @constructor
+ */
+export class MyObject {
+[key: string]: any;
+getter: any;
+setter: any;
+properties: any;
+
+constructor(proto) {
+  this.getter = Object.create(null);
+  this.setter = Object.create(null);
+  this.properties = Object.create(null);
+  this.proto = proto;
+}
+
+/** @type {Interpreter.MyObject} */
+proto: Interpreter.MyObject = null;
+
+/** @type {boolean} */
+isObject = true;
+
+/** @type {string} */
+class = 'Object';
+
+/** @type {Date|RegExp|boolean|number|string|undefined|null} */
+data: Date | RegExp | boolean | number | string | undefined | null = null;
+
+/**
+ * Convert this object into a string.
+ * @return {string} String value.
+ * @override
+ */
+toString() {
+  if (this.class === 'Array') {
+    // Array
+    var cycles = Interpreter.toStringCycles_;
+    cycles.push(this);
+    try {
+      var strs = [];
+      for (var i = 0; i < this.properties.length; i++) {
+        var value = this.properties[i];
+        strs[i] = (value && value.isObject && cycles.indexOf(value) !== -1) ?
+            '...' : value;
+      }
+    } finally {
+      cycles.pop();
+    }
+    return strs.join(',');
+  }
+  if (this.class === 'Error') {
+    var cycles = Interpreter.toStringCycles_;
+    if (cycles.indexOf(this) !== -1) {
+      return '[object Error]';
+    }
+    var name, message;
+    // Bug: Does not support getters and setters for name or message.
+    var obj = <Interpreter.MyObject>this;
+    do {
+      if ('name' in obj.properties) {
+        name = obj.properties['name'];
+        break;
+      }
+    } while ((obj = obj.proto));
+    var obj = <Interpreter.MyObject>this;
+    do {
+      if ('message' in obj.properties) {
+        message = obj.properties['message'];
+        break;
+      }
+    } while ((obj = obj.proto));
+    cycles.push(this);
+    try {
+      name = name && name.toString();
+      message = message && message.toString();
+    } finally {
+      cycles.pop();
+    }
+    return message ? name + ': ' + message : String(name);
+  }
+
+  // RegExp, Date, and boxed primitives.
+  if (this.data !== null) {
+    return String(this.data);
+  }
+
+  return '[object ' + this.class + ']';
+}
+
+/**
+ * Return the object's value.
+ * @return {Interpreter.MyValue} Value.
+ * @override
+ */
+valueOf() {
+  if (this.data === undefined || this.data === null ||
+      this.data instanceof RegExp) {
+    return this; // An Object.
+  }
+  if (this.data instanceof Date) {
+    return this.data.valueOf();  // Milliseconds.
+  }
+  return /** @type {(boolean|number|string)} */ (this.data);  // Boxed primitive.
+}
+}
+
+/**
+ * Typedef for JS values.
+ * @typedef {!Interpreter.MyObject|boolean|number|string|undefined|null}
+ */
+export type MyValue = MyObject | boolean | number | string | undefined | null;
+
+/**
+ * Class for a state.
+ * @param {!MyObject} node AST node for the state.
+ * @param {!Interpreter.MyObject} scope Scope object for the state.
+ * @constructor
+ */
+export class MyState {
+[key: string]: any;
+node: ESTree.BaseNode;
+scope: Interpreter.MyObject;
+constructor(node: ESTree.BaseNode, scope: Interpreter.MyObject) {
+  this.node = node;
+  this.scope = scope;
+}
+}
+
+export interface MyValueTable {
+  pseudo: MyValue[],
+  native: any[]
+}
+
+export interface MyDescriptor {
+  get?: MyObject;
+  set?: MyObject;
+  configurable?: boolean;
+  enumerable?: boolean;
+  writable?: boolean;
+  value?: any;
+}
+
+export interface Acorn {
+  parse(code: string, options?: any): ESTree.Program;
+}
+
+export interface NodeConstructor {
+  new (): ESTree.BaseNode;
+}
+
+export interface NativeFunction extends Function {
+  id?: number;
+}
+}
+
+// These lines are added for API compatibility
+Interpreter['Object'] = Interpreter.MyObject;
+Interpreter['State'] = Interpreter.MyState;
+
+// Look for globally-defined acorn
+try {
+  Interpreter.acorn = (self || global)['acorn'];
+} catch (e) {
+  // do nothing if we fail
+}
+
+export = Interpreter;
diff --git a/lib/require.js b/lib/require.js
new file mode 100644
index 00000000..b6678d48
--- /dev/null
+++ b/lib/require.js
@@ -0,0 +1,5 @@
+/** vim: et:ts=4:sw=4:sts=4
+ * @license RequireJS 2.3.4 Copyright jQuery Foundation and other contributors.
+ * Released under MIT license, https://github.com/requirejs/requirejs/blob/master/LICENSE
+ */
+var requirejs,require,define;!function(global,setTimeout){function commentReplace(e,t){return t||""}function isFunction(e){return"[object Function]"===ostring.call(e)}function isArray(e){return"[object Array]"===ostring.call(e)}function each(e,t){if(e){var i;for(i=0;i<e.length&&(!e[i]||!t(e[i],i,e));i+=1);}}function eachReverse(e,t){if(e){var i;for(i=e.length-1;i>-1&&(!e[i]||!t(e[i],i,e));i-=1);}}function hasProp(e,t){return hasOwn.call(e,t)}function getOwn(e,t){return hasProp(e,t)&&e[t]}function eachProp(e,t){var i;for(i in e)if(hasProp(e,i)&&t(e[i],i))break}function mixin(e,t,i,r){return t&&eachProp(t,function(t,n){!i&&hasProp(e,n)||(!r||"object"!=typeof t||!t||isArray(t)||isFunction(t)||t instanceof RegExp?e[n]=t:(e[n]||(e[n]={}),mixin(e[n],t,i,r)))}),e}function bind(e,t){return function(){return t.apply(e,arguments)}}function scripts(){return document.getElementsByTagName("script")}function defaultOnError(e){throw e}function getGlobal(e){if(!e)return e;var t=global;return each(e.split("."),function(e){t=t[e]}),t}function makeError(e,t,i,r){var n=new Error(t+"\nhttp://requirejs.org/docs/errors.html#"+e);return n.requireType=e,n.requireModules=r,i&&(n.originalError=i),n}function newContext(e){function t(e){var t,i;for(t=0;t<e.length;t++)if("."===(i=e[t]))e.splice(t,1),t-=1;else if(".."===i){if(0===t||1===t&&".."===e[2]||".."===e[t-1])continue;t>0&&(e.splice(t-1,2),t-=2)}}function i(e,i,r){var n,o,a,s,u,c,d,p,f,l,h=i&&i.split("/"),m=y.map,g=m&&m["*"];if(e&&(c=(e=e.split("/")).length-1,y.nodeIdCompat&&jsSuffixRegExp.test(e[c])&&(e[c]=e[c].replace(jsSuffixRegExp,"")),"."===e[0].charAt(0)&&h&&(e=h.slice(0,h.length-1).concat(e)),t(e),e=e.join("/")),r&&m&&(h||g)){e:for(a=(o=e.split("/")).length;a>0;a-=1){if(u=o.slice(0,a).join("/"),h)for(s=h.length;s>0;s-=1)if((n=getOwn(m,h.slice(0,s).join("/")))&&(n=getOwn(n,u))){d=n,p=a;break e}!f&&g&&getOwn(g,u)&&(f=getOwn(g,u),l=a)}!d&&f&&(d=f,p=l),d&&(o.splice(0,p,d),e=o.join("/"))}return getOwn(y.pkgs,e)||e}function r(e){isBrowser&&each(scripts(),function(t){if(t.getAttribute("data-requiremodule")===e&&t.getAttribute("data-requirecontext")===q.contextName)return t.parentNode.removeChild(t),!0})}function n(e){var t=getOwn(y.paths,e);if(t&&isArray(t)&&t.length>1)return t.shift(),q.require.undef(e),q.makeRequire(null,{skipMap:!0})([e]),!0}function o(e){var t,i=e?e.indexOf("!"):-1;return i>-1&&(t=e.substring(0,i),e=e.substring(i+1,e.length)),[t,e]}function a(e,t,r,n){var a,s,u,c,d=null,p=t?t.name:null,f=e,l=!0,h="";return e||(l=!1,e="_@r"+(T+=1)),c=o(e),d=c[0],e=c[1],d&&(d=i(d,p,n),s=getOwn(j,d)),e&&(d?h=r?e:s&&s.normalize?s.normalize(e,function(e){return i(e,p,n)}):-1===e.indexOf("!")?i(e,p,n):e:(d=(c=o(h=i(e,p,n)))[0],h=c[1],r=!0,a=q.nameToUrl(h))),u=!d||s||r?"":"_unnormalized"+(A+=1),{prefix:d,name:h,parentMap:t,unnormalized:!!u,url:a,originalName:f,isDefine:l,id:(d?d+"!"+h:h)+u}}function s(e){var t=e.id,i=getOwn(S,t);return i||(i=S[t]=new q.Module(e)),i}function u(e,t,i){var 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new file mode 100644
index 00000000..77507d65
--- /dev/null
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diff --git a/package.json b/package.json
new file mode 100644
index 00000000..5ddbdd2a
--- /dev/null
+++ b/package.json
@@ -0,0 +1,44 @@
+{
+  "name": "JS-Interpreter",
+  "version": "0.1.2",
+  "description": "A sandboxed JavaScript interpreter in JavaScript. Execute arbitrary JavaScript code line by line in isolation and safety.",
+  "main": "dist/interpreter.js",
+  "types": "dist/interpreter.d.ts",
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/arcatdmz/JS-Interpreter.git"
+  },
+  "keywords": [
+    "javascript",
+    "js-interpreter",
+    "sandbox"
+  ],
+  "author": "Jun Kato <i@junkato.jp> (https://junkato.jp)",
+  "license": "Apache-2.0",
+  "bugs": {
+    "url": "https://github.com/arcatdmz/JS-Interpreter/issues"
+  },
+  "homepage": "https://github.com/arcatdmz/JS-Interpreter#readme",
+  "scripts": {
+    "build": "tsc --project tsconfig.json",
+    "build-global": "webpack --colors --config webpack.config.js",
+    "build-with-acorn": "webpack --colors --config webpack.with-acorn.config.js",
+    "build-demo-browser": "tsc --project tsconfig.demo-browser.json",
+    "build-demo-nodejs": "tsc --project tsconfig.demo-nodejs.json"
+  },
+  "dependencies": {
+    "@types/estree": "0.0.37"
+  },
+  "devDependencies": {
+    "@types/acorn": "^4.0.2",
+    "@types/node": "^8.0.20",
+    "@types/requirejs": "^2.1.30",
+    "babel-core": "^6.25.0",
+    "babel-loader": "^7.1.1",
+    "babel-preset-es2015": "^6.24.1",
+    "ts-loader": "^2.3.2",
+    "typescript": "^2.4.2",
+    "uglifyjs-webpack-plugin": "^0.4.6",
+    "webpack": "^3.5.4"
+  }
+}
diff --git a/tsconfig.demo-browser.json b/tsconfig.demo-browser.json
new file mode 100644
index 00000000..f497b428
--- /dev/null
+++ b/tsconfig.demo-browser.json
@@ -0,0 +1,9 @@
+{
+  "compilerOptions": {
+    "module": "amd",
+    "target": "es5",
+    "types": ["requirejs"],
+    "skipLibCheck": true
+  },
+  "files": ["./demos/browser/index.ts"]
+}
\ No newline at end of file
diff --git a/tsconfig.demo-nodejs.json b/tsconfig.demo-nodejs.json
new file mode 100644
index 00000000..3a38cc29
--- /dev/null
+++ b/tsconfig.demo-nodejs.json
@@ -0,0 +1,8 @@
+{
+  "compilerOptions": {
+    "module": "commonjs",
+    "target": "es5",
+    "types": ["node"]
+  },
+  "files": ["./demos/nodejs/index.ts"]
+}
\ No newline at end of file
diff --git a/tsconfig.json b/tsconfig.json
new file mode 100644
index 00000000..faf6ecd8
--- /dev/null
+++ b/tsconfig.json
@@ -0,0 +1,11 @@
+{
+  "compilerOptions": {
+    "module": "umd",
+    "sourceMap": true,
+    "declaration": true,
+    "target": "es5",
+    "outDir": "dist",
+    "types": ["estree", "node"]
+  },
+  "files": ["./lib/interpreter.ts"]
+}
\ No newline at end of file
diff --git a/tsconfig.webpack.json b/tsconfig.webpack.json
new file mode 100644
index 00000000..f28fca68
--- /dev/null
+++ b/tsconfig.webpack.json
@@ -0,0 +1,11 @@
+{
+  "compilerOptions": {
+    "module": "amd",
+    "sourceMap": true,
+    "allowJs": true,
+    "target": "es5",
+    "outDir": "dist",
+    "types": ["estree", "node"]
+  },
+  "files": ["./lib/interpreter.ts"]
+}
\ No newline at end of file
diff --git a/webpack.config.js b/webpack.config.js
new file mode 100644
index 00000000..1c712581
--- /dev/null
+++ b/webpack.config.js
@@ -0,0 +1,24 @@
+module.exports = {
+  entry: './lib/interpreter.ts',
+  output: {
+    filename: './dist/interpreter.global.js',
+    library: 'Interpreter'
+  },
+
+  devtool: 'source-map',
+
+  resolve: {
+    extensions: ['.ts', '.tsx', '.js']
+  },
+
+  module: {
+    rules: [
+      {
+        test: /\.tsx?$/,
+        use: [
+          {loader: 'ts-loader', options: { configFileName: 'tsconfig.webpack.json' }}
+        ]
+      }
+    ]
+  }
+};
\ No newline at end of file
diff --git a/webpack.with-acorn.config.js b/webpack.with-acorn.config.js
new file mode 100644
index 00000000..4b3931dc
--- /dev/null
+++ b/webpack.with-acorn.config.js
@@ -0,0 +1,46 @@
+const UglifyJSPlugin = require('uglifyjs-webpack-plugin')
+
+module.exports = {
+  entry: ['./lib/acorn_interpreter.ts'],
+  output: {
+    filename: './dist/acorn_interpreter.js',
+    library: 'Interpreter'
+  },
+
+  devtool: 'source-map',
+
+  resolve: {
+    extensions: ['.ts', '.tsx', '.js']
+  },
+
+  module: {
+    rules: [
+      {
+        test: /\.js$/,
+        exclude: /(node_modules|bower_components)/,
+        use: {
+          loader: 'babel-loader',
+          options: {
+            presets: ['es2015']
+          }
+        }
+      },
+      {
+        test: /\.tsx?$/,
+        use: [
+          {loader: 'ts-loader', options: { configFileName: 'tsconfig.webpack.json' }}
+        ]
+      }
+    ]
+  },
+
+  plugins: [
+    new UglifyJSPlugin({
+      compress: {warnings: false},
+      output: {comments: function(node, comment) {
+        return /^!/.test(comment.value);
+      }},
+      sourceMap: true
+    })
+  ]
+};
\ No newline at end of file