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suspend.spec.coffee
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suspend.spec.coffee
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describe "The evaluator module", ->
evaluator = undefined
beforeEach ->
evaluator = new Evaluator()
afterEach ->
iframe = evaluator.getGlobal("frameElement")
iframe.parentElement.removeChild iframe
it "creates an iframe to evaluate code in", ->
iframe = evaluator.getGlobal("frameElement")
# Need to test against both the global iframe and the iframe's iframe as
# a workaround for PhantomJS. Really, we just care that it's an iframe.
isIFrame = iframe instanceof HTMLIFrameElement or
iframe instanceof evaluator.getGlobal("HTMLIFrameElement")
expect(isIFrame).toBe true
expect(iframe.height).toEqual "0"
expect(iframe.width).toEqual "0"
expect(iframe.style.visibility).toEqual "hidden"
describe "when compiling", ->
beforeEach ->
@addMatchers
toHaveSameAST: (expected) ->
actual = @actual
@message = =>
"Expected #{@actual} to have the same AST as #{expected}"
if typeof @actual == typeof expected == 'string'
actual = [actual]
expected = [expected]
if Array.isArray(actual) and Array.isArray(expected)
if actual.length == expected.length
for act, i in actual
exp = expected[i]
actualAST = esprima.parse(act).body
expectedAST = esprima.parse(exp).body
unless @env.equals_ actualAST, expectedAST
return false
# Went through all strings, all had the same AST
return true
return false
toBeFunctionDef: (name, params, body, tempVar) ->
message = null
unless @env.equals_ @actual, jasmine.any(Evaluator.Function)
message = "Expected #{@actual} to be an instance of " +
"the evaluator's Function class"
else unless @actual.name == name
message = "Expected function to have name #{name}, " +
"instead had name #{@actual.name}"
else unless @env.equals_ @actual.params, params
message = "Expected function to have params #{params}, " +
"instead had params #{@actual.params}"
else unless @actual.tempVar == tempVar
message = "Expected function to be stored in variable #{tempVar}, " +
"instead stored in #{@actual.tempVar}"
else
functionBytecode = getExpressionBytecode("(function () {#{body}})")
bodyInstructions = functionBytecode.preInstructions[0].body
unless @env.equals_ @actual.body, bodyInstructions
message = "Expected function body to have same instructions as #{body}"
@message = -> message
message == null
toBeFunctionCall: (callee, args, tempVar, isObjectCreation=false) ->
# If the function call is on a dictionary field (aka d.func()) the
# callee should be an array of two elements where the first element
# is the dictionary that will be the 'this' object, and the second
# argument is the field on that dictionary that contains the
# function. If the function call is not on a dictionary (eg func())
# the callee can be just the string of the object containing the
# function or an array of [null, <function>] where <function> is the
# string of the object containing the function.
unless Array.isArray(callee) or isObjectCreation
callee = [null, callee]
targetClass = if isObjectCreation then Evaluator.NewObject else Evaluator.FunctionCall
message = null
unless @env.equals_ @actual, jasmine.any(targetClass)
message = "Expected #{@actual} to be instance of #{targetClass}."
else unless @env.equals_ @actual.callee, callee
message = "Expected to be calling #{jasmine.pp(callee)}, " +
"actually calling #{jasmine.pp(@actual.callee)}."
else unless @actual.tempVar == tempVar
message = "Expected function call result to be stored in #{tempVar}, " +
"actually stored in #{@actual.tempVar}."
else unless @actual.args.length == args.length
message = "Calling function with #{@actual.args.length} arguments, " +
"expected to be calling with #{args.length} arguments."
else
expect(@actual.args).toHaveSameAST(args)
@message = -> message
message == null
getExpressionBytecode = (expressionString) ->
body = esprima.parse(expressionString).body
expect(body.length).toEqual 1
expect(body[0].type).toEqual "ExpressionStatement"
Evaluator.compileExpression body[0].expression
getStatementsBytecode = (statementsString) ->
ast = esprima.parse(statementsString).body
Evaluator.compileStatements ast
tempName = (index) ->
"$__temp__[#{index}]"
describe "expression bytecode", ->
it "converts non-function calls to a string", ->
original = [
"'my string'", "true", "null", "123.45", "1.0e2", "/regex/", # literals
"$my_id_", # identifier
"this", # this keyword
"[1, true, 'hi', foo]", # array
"({a: 1})", "({msg: 'hello', arr: [1,2,3], obj: {foo: 'bar'}})", # Object literals
"1, 2, red, blue", # sequence
"-a", "+5", "!hello", "~true", "! 'hey'", # character unary operators
"typeof obj", "void 'hi'", "delete foo", # string unary operators
"a in b", "'0' == false", # binary operators
"foo = 12", "i += 4", # assignment expression
"a++", "b--", "++c", "--d", # update operators
"foo[bar]", "arr[0]", "obj['key']", # membership access
"(1 + 2) * 3", "a + (b = 2)", # order of operations
]
for expression in original
# Expect each expression to compile to something with the same AST
try
bytecode = getExpressionBytecode(expression)
expect(bytecode.preInstructions).toEqual []
expect(bytecode.expression).toHaveSameAST expression
catch e
throw new Error("Failed to compile #{expression}. Error is: #{e.toString()}")
it "can define functions", ->
temp = tempName(0)
# Function should be pulled out into a separate statement and the
# expression itself should be the temp var containing the function.
body = "var a = {hi: 'hello'}; a.b = 123; var b = 'foo'"
original = "(function () {#{body}})"
bytecode = getExpressionBytecode(original)
expect(bytecode.preInstructions.length).toEqual 1
expect(bytecode.preInstructions[0]).toBeFunctionDef null, [], body, temp
expect(bytecode.expression).toEqual temp
original = "(function foo(a, b) {a + b})"
bytecode = getExpressionBytecode(original)
expect(bytecode.preInstructions.length).toEqual 1
expect(bytecode.preInstructions[0]).toBeFunctionDef "foo", ["a", "b"], "a + b", temp
expect(bytecode.expression).toEqual temp
it "can call functions", ->
temp = tempName(0)
bytecode = getExpressionBytecode("a.b.c()")
expect(bytecode.preInstructions.length).toEqual 1
expect(bytecode.preInstructions[0]).toBeFunctionCall ["a.b", "'c'"], [], temp
expect(bytecode.expression).toEqual temp
bytecode = getExpressionBytecode("arr[i]()")
expect(bytecode.preInstructions.length).toEqual 1
expect(bytecode.preInstructions[0]).toBeFunctionCall ["arr", "i"], [], temp
expect(bytecode.expression).toEqual temp
bytecode = getExpressionBytecode("func(foo, bar)")
expect(bytecode.preInstructions.length).toEqual 1
expect(bytecode.preInstructions[0]).toBeFunctionCall "func", ["foo", "bar"], temp
expect(bytecode.expression).toEqual temp
it "can create new objects", ->
temp = tempName(0)
bytecode = getExpressionBytecode("new foo(a, b, c)")
expect(bytecode.preInstructions.length).toEqual 1
expect(bytecode.preInstructions[0]).toBeFunctionCall "foo", ["a", "b", "c"], temp, true
expect(bytecode.expression).toEqual temp
it "handles multiple pre-instructions", ->
t0 = tempName(0)
t1 = tempName(1)
bytecode = getExpressionBytecode("[foo(), bar()]")
expect(bytecode.preInstructions.length).toEqual 2
expect(bytecode.preInstructions[0]).toBeFunctionCall "foo", [], t0
expect(bytecode.preInstructions[1]).toBeFunctionCall "bar", [], t1
expect(bytecode.expression).toHaveSameAST "[#{t0}, #{t1}]"
bytecode = getExpressionBytecode("obj.baz(a).garply(b).length")
expect(bytecode.preInstructions.length).toEqual 2
expect(bytecode.preInstructions[0]).toBeFunctionCall ["obj", "'baz'"], ["a"], t0
expect(bytecode.preInstructions[1]).toBeFunctionCall [t0, "'garply'"], ["b"], t1
expect(bytecode.expression).toEqual "#{t1}.length"
bytecode = getExpressionBytecode("outer(inner())")
expect(bytecode.preInstructions.length).toEqual 2
expect(bytecode.preInstructions[0]).toBeFunctionCall "inner", [], t0
expect(bytecode.preInstructions[1]).toBeFunctionCall "outer", [t0], t1
expect(bytecode.expression).toEqual t1
# Note that this relies on the If statement
it "desugars short circuiting logical expressions", ->
bytecode = getExpressionBytecode('a && b')
# This should desugar to:
# temp = a
# if (temp) temp = b
# temp
temp = tempName(0)
expect(bytecode.preInstructions.length).toEqual 2
expect(bytecode.preInstructions[0]).toHaveSameAST "#{temp} = a"
ifStatement = bytecode.preInstructions[1]
expect(ifStatement).toEqual jasmine.any(Evaluator.If)
expect(ifStatement.condition).toHaveSameAST temp
expect(ifStatement.thenCase).toHaveSameAST ["#{temp} = b"]
expect(ifStatement.elseCase).toEqual []
expect(bytecode.expression).toEqual temp
bytecode = getExpressionBytecode('f() || g()')
# This should desugar to:
# temp1 = f()
# temp0 = temp0
# if (!temp0)
# temp0 = g()
# temp0 = temp0
# temp0
t0 = tempName(0)
t1 = tempName(1)
expect(bytecode.preInstructions.length).toEqual 3
expect(bytecode.preInstructions[0]).toBeFunctionCall 'f', [], t1
expect(bytecode.preInstructions[1]).toHaveSameAST "#{t0} = #{t1}"
ifStatement = bytecode.preInstructions[2]
expect(ifStatement).toEqual jasmine.any(Evaluator.If)
expect(ifStatement.condition).toHaveSameAST "!#{t0}"
expect(ifStatement.thenCase.length).toEqual 2
expect(ifStatement.thenCase[0]).toBeFunctionCall 'g', [], t0
expect(ifStatement.thenCase[1]).toHaveSameAST "#{t0} = #{t0}"
expect(ifStatement.elseCase).toEqual []
expect(bytecode.expression).toEqual t0
it "desugars ternary expressions", ->
bytecode = getExpressionBytecode('a() ? b() : c()')
# This should desugar to:
# temp1 = a()
# if (temp1)
# temp0 = b()
# temp0 = temp0
# else
# temp0 = c()
# temp0 = temp0
# temp0
t0 = tempName(0)
t1 = tempName(1)
expect(bytecode.preInstructions.length).toEqual 2
expect(bytecode.preInstructions[0]).toBeFunctionCall 'a', [], t1
ifStatement = bytecode.preInstructions[1]
expect(ifStatement).toEqual jasmine.any(Evaluator.If)
expect(ifStatement.condition).toHaveSameAST t1
expect(ifStatement.thenCase.length).toEqual 2
expect(ifStatement.thenCase[0]).toBeFunctionCall 'b', [], t0
expect(ifStatement.thenCase[1]).toHaveSameAST "#{t0} = #{t0}"
expect(ifStatement.elseCase.length).toEqual 2
expect(ifStatement.elseCase[0]).toBeFunctionCall 'c', [], t0
expect(ifStatement.elseCase[1]).toHaveSameAST "#{t0} = #{t0}"
expect(bytecode.expression).toEqual t0
describe "statement bytecode", ->
expectStatementsEqual = (program, expectedStatements, expectedVariables, expectedFunctions) ->
expectedVariables = expectedVariables or []
expectedFunctions = expectedFunctions or []
# Parse and compile code
bytecode = getStatementsBytecode(program)
compiled = bytecode.instructions
# Have to sort because these are order insensitive. The elements should
# just be strings anyway, which has well defined sorting order.
expect(bytecode.declaredVariables.sort()).toEqual expectedVariables.sort()
# Check that declared functions are the same
expect(bytecode.declaredFunctions.length).toEqual expectedFunctions.length
for actualFunc, i in bytecode.declaredFunctions
# functionInformation should be the arguments to pass into expectFunctionDef
exp = expect(actualFunc)
exp.toBeFunctionDef.apply(exp, expectedFunctions[i])
# Check that AST's match
expect(compiled.length).toEqual expectedStatements.length
for c, i in compiled
expect(c).toHaveSameAST expectedStatements[i]
it "ignores empty statements", ->
expectStatementsEqual ";", []
it "puts expressions in their own instruction", ->
expectStatementsEqual(
"a; 1 + 2; foo = 'hi'"
["a", "1 + 2", "foo = 'hi'"]
)
it "puts an expression's pre instructions before the instruction", ->
t0 = tempName(0)
t1 = tempName(1)
original = "var a = 5; b = f(a, g());"
bytecode = getStatementsBytecode(original)
expect(bytecode.declaredVariables).toEqual ["a"]
expect(bytecode.instructions.length).toEqual 4
expect(bytecode.instructions[0]).toHaveSameAST "void (a = 5)"
expect(bytecode.instructions[1]).toBeFunctionCall "g", [], t0
expect(bytecode.instructions[2]).toBeFunctionCall "f", ["a", t0], t1
expect(bytecode.instructions[3]).toHaveSameAST "b = #{t1}"
it "extracts declared variables", ->
expectStatementsEqual(
"a = 1; var b = 2, c; var a; b++"
["a = 1", "void (b = 2)", "b++"]
["a", "b", "c"]
)
it "extracts declared functions", ->
bytecode = getStatementsBytecode("
obj = {msg: 'hi'};
function foo(a, b) {
a[b] = 'foo'
}
var bar = function bar() {};
")
expect(bytecode.declaredVariables).toEqual ["bar"]
declaredFuncs = bytecode.declaredFunctions
expect(declaredFuncs.length).toEqual 1
expect(declaredFuncs[0]).toBeFunctionDef "foo", ["a", "b"], "a[b] = 'foo'", null
expect(bytecode.instructions.length).toEqual 3
expect(bytecode.instructions[0]).toHaveSameAST "obj = {msg: 'hi'}"
expect(bytecode.instructions[1]).toBeFunctionDef "bar", [], "", tempName(0)
expect(bytecode.instructions[2]).toHaveSameAST "void (bar = #{tempName(0)})"
it "can return values from functions", ->
bytecode = getExpressionBytecode("(function () {return 5})")
func = bytecode.preInstructions[0]
returnInst = func.body.instructions[0]
expect(returnInst).toEqual jasmine.any(Evaluator.Return)
expect(returnInst.value).toEqual "5"
it "flattens block statements", ->
expectStatementsEqual(
"a = 1; {b = 2; var b, c = 3; function foo() {}}; var c = 4;"
["a = 1", "b = 2", "void (c = 3)", "void (c = 4)"]
["b", "c"]
[["foo", [], "", null]]
)
it "creates if statements with function scope", ->
bytecode = getStatementsBytecode("
var myval = 'hi';
if (!isHi(myval)) {
var a = 1;
} else {
var b = 2;
function inside() {}
}
function isHi(val) {return val === 'hi'}
var c = 'hello';
")
expect(bytecode.declaredVariables).toEqual ["myval", "a", "b", "c"]
declaredFuncs = bytecode.declaredFunctions
expect(declaredFuncs.length).toEqual 2
expect(declaredFuncs[0]).toBeFunctionDef "inside", [], "", null
expect(declaredFuncs[1]).toBeFunctionDef "isHi", ["val"], "return val === 'hi'", null
expect(bytecode.instructions.length).toEqual 4
expect(bytecode.instructions[0]).toHaveSameAST "void (myval = 'hi')"
expect(bytecode.instructions[1]).toBeFunctionCall "isHi", ["myval"], tempName(0)
ifStatement = bytecode.instructions[2]
expect(ifStatement).toEqual jasmine.any(Evaluator.If)
expect(ifStatement.condition).toHaveSameAST "!#{tempName(0)}"
expect(ifStatement.thenCase).toHaveSameAST ["void (a = 1)"]
expect(ifStatement.elseCase).toHaveSameAST ["void (b = 2)"]
expect(bytecode.instructions[3]).toHaveSameAST "void (c = 'hello')"
it "handles if statements without else blocks", ->
bytecode = getStatementsBytecode("
if (predicate) {
a = 1;
}
")
expect(bytecode.instructions.length).toEqual 1
ifStatement = bytecode.instructions[0]
expect(ifStatement.thenCase).toHaveSameAST ["a = 1"]
expect(ifStatement.elseCase).toEqual []
it "ignores labels", ->
original = "
foo:
{
a = 1;
bar: a++
}"
expectStatementsEqual original, ["a = 1", "a++"]
it "creates With blocks with function scope", ->
bytecode = getStatementsBytecode("
with (getEnv()) {
var a = 1;
function b () {}
}
")
expect(bytecode.declaredVariables).toEqual ["a"]
expect(bytecode.declaredFunctions.length).toEqual 1
expect(bytecode.declaredFunctions[0]).toBeFunctionDef "b", [], "", null
expect(bytecode.instructions[0]).toBeFunctionCall "getEnv", [], tempName(0)
expect(bytecode.instructions[1]).toEqual jasmine.any(Evaluator.With)
expect(bytecode.instructions[1].body).toHaveSameAST ["void (a = 1)"]
describe "creating Switch blocks", ->
it "desugars case evaluation and flattens all statements", ->
bytecode = getStatementsBytecode("
switch (val()) {
case first:
a = 2;
b(a);
case 'second':
a = 5;
case third():
a++;
}
")
# This should desugar to:
# temp1 = val()
# if temp1 == first
# temp0 = 0 // instruction index at "case first:"
# else
# if temp1 == 'second'
# temp0 = 3 // instruction index at "case 'second':"
# else
# temp2 = third()
# if temp1 == temp2
# temp0 = 4 // instruction index at "case third():"
# else
# temp0 = null // No default
# switch (start at temp0)
# a = 2 // case first
# temp = b(a)
# temp
# a = 5 // case 'second'
# a++ // case third()
t0 = tempName(0)
t1 = tempName(1)
t2 = tempName(2)
expect(bytecode.instructions.length).toEqual 3
expect(bytecode.instructions[0]).toBeFunctionCall 'val', [], t1
firstLevel = bytecode.instructions[1]
expect(firstLevel).toEqual jasmine.any(Evaluator.If)
expect(firstLevel.condition).toHaveSameAST "#{t1} == first"
expect(firstLevel.thenCase).toHaveSameAST ["#{t0} = 0"]
expect(firstLevel.elseCase.length).toEqual 1
secondLevel = firstLevel.elseCase[0]
expect(secondLevel).toEqual jasmine.any(Evaluator.If)
expect(secondLevel.condition).toHaveSameAST "#{t1} == 'second'"
expect(secondLevel.thenCase).toHaveSameAST ["#{t0} = 3"]
expect(secondLevel.elseCase.length).toEqual 2
expect(secondLevel.elseCase[0]).toBeFunctionCall 'third', [], t2
thirdLevel = secondLevel.elseCase[1]
expect(thirdLevel).toEqual jasmine.any(Evaluator.If)
expect(thirdLevel.condition).toHaveSameAST "#{t1} == #{t2}"
expect(thirdLevel.thenCase).toHaveSameAST ["#{t0} = 4"]
expect(thirdLevel.elseCase).toHaveSameAST ["#{t0} = null"]
switchStatement = bytecode.instructions[2]
expect(switchStatement).toEqual jasmine.any(Evaluator.Switch)
expect(switchStatement.startPCVar).toEqual t0
inst = switchStatement.instructions
expect(inst[0]).toHaveSameAST "a = 2"
expect(inst[1]).toBeFunctionCall "b", ["a"], t0
expect(inst[2]).toHaveSameAST t0
expect(inst[3]).toHaveSameAST "a = 5"
expect(inst[4]).toHaveSameAST "a++"
it "has function scope", ->
bytecode = getStatementsBytecode("
switch (foo().val) {
case first:
var a = 2;
case 'second':
var b = 5;
function c(d) {e}
}
")
expect(bytecode.declaredVariables).toEqual ["a", "b"]
expect(bytecode.declaredFunctions.length).toEqual 1
expect(bytecode.declaredFunctions[0]).toBeFunctionDef "c", ["d"], "e", null
inst = bytecode.instructions
expect(inst.length).toEqual 3
expect(inst[0]).toBeFunctionCall "foo", [], tempName(1)
expect(inst[1]).toEqual jasmine.any(Evaluator.If)
expect(inst[2]).toEqual jasmine.any(Evaluator.Switch)
expect(inst[2].startPCVar).toEqual tempName(0)
it "stores a default index", ->
bytecode = getStatementsBytecode("
switch (val) {
case 'foo':
a = 2;
default:
a = 4;
case 'bar':
a = 6;
}
")
# This should desugar to:
# if val == 'foo'
# temp = 0 // instruction index of "case 'foo':"
# else
# if val == 'bar'
# temp = 2 // instruction index of "case 'bar':"
# else
# temp = 1 // instruction index of "default"
# switch (start at temp)....
temp = tempName(0)
expect(bytecode.instructions.length).toEqual 2
firstLevel = bytecode.instructions[0]
expect(firstLevel).toEqual jasmine.any(Evaluator.If)
expect(firstLevel.condition).toHaveSameAST "val == 'foo'"
expect(firstLevel.thenCase).toHaveSameAST ["#{temp} = 0"]
expect(firstLevel.elseCase.length).toEqual 1
secondLevel = firstLevel.elseCase[0]
expect(secondLevel).toEqual jasmine.any(Evaluator.If)
expect(secondLevel.condition).toHaveSameAST "val == 'bar'"
expect(secondLevel.thenCase).toHaveSameAST ["#{temp} = 2"]
expect(secondLevel.elseCase).toHaveSameAST ["#{temp} = 1"]
switchStatement = bytecode.instructions[1]
expect(switchStatement).toEqual jasmine.any(Evaluator.Switch)
expect(switchStatement.startPCVar).toEqual temp
it "creates break statements", ->
bytecode = getStatementsBytecode("
switch (val) {
case 'foo':
break;
}
")
switchStatement = bytecode.instructions[1]
breakStatement = switchStatement.instructions[0]
expect(breakStatement).toEqual jasmine.any(Evaluator.Break)
it "does not allow break statements to have labels", ->
original = "
switch (val) {
case 'foo':
lbl:break lbl;
}"
expect(->
getStatementsBytecode original
).toThrow "Does not support labelled breaks."
# Note that the tests for while and the tests for continue rely on each other
it "creates continue statements", ->
bytecode = getStatementsBytecode("
while (true) {
continue;
};
")
whileStatement = bytecode.instructions[0]
continueStatement = whileStatement.instructions[1]
expect(continueStatement).toEqual jasmine.any(Evaluator.Continue)
it "doesn't allow labelled continues", ->
original = "
lbl:
while (true) {
continue lbl;
};"
expect(->
getStatementsBytecode original
).toThrow "Does not support labelled continues."
describe "creating While loops", ->
it "desugars it into a loop", ->
bytecode = getStatementsBytecode("
while (!shouldStop()) {
a = 1 + 2;
a++;
}
")
# This should desugar to:
# temp = shouldStop()
# if (!(!temp))
# break;
# a = 1 + 2
# a++
# continue;
expect(bytecode.instructions.length).toEqual 1
loopInstr = bytecode.instructions[0]
expect(loopInstr).toEqual jasmine.any(Evaluator.Loop)
expect(loopInstr.instructions.length).toEqual 5
expect(loopInstr.instructions[0]).toBeFunctionCall "shouldStop", [], tempName(0)
ifStatement = loopInstr.instructions[1]
expect(ifStatement).toEqual jasmine.any(Evaluator.If)
expect(ifStatement.condition).toHaveSameAST "!!#{tempName(0)}"
expect(ifStatement.thenCase.length).toEqual 1
expect(ifStatement.thenCase[0]).toEqual jasmine.any(Evaluator.Break)
expect(ifStatement.elseCase).toEqual []
expect(loopInstr.instructions[2]).toHaveSameAST "a = 1 + 2"
expect(loopInstr.instructions[3]).toHaveSameAST "a++"
expect(loopInstr.instructions[4]).toEqual jasmine.any(Evaluator.Continue)
it "uses function scope", ->
bytecode = getStatementsBytecode("
while (true) {
var a = 1 + 2;
function b(c) {d};
}
")
expect(bytecode.declaredVariables).toEqual ["a"]
expect(bytecode.declaredFunctions.length).toEqual 1
expect(bytecode.declaredFunctions[0]).toBeFunctionDef "b", ["c"], "d", null
describe "creating Do While loops", ->
it "unrolls one execution and desugars it into a loop", ->
bytecode = getStatementsBytecode("
do {
a = 1 + 2;
a++;
} while (!shouldStop());
")
# This should desugar to:
# temp = shouldStop()
# if (!(!temp))
# break;
# a = 1 + 2
# a++
# continue;
expect(bytecode.instructions.length).toEqual 1
loopInstr = bytecode.instructions[0]
expect(loopInstr).toEqual jasmine.any(Evaluator.Loop)
expect(loopInstr.instructions.length).toEqual 5
expect(loopInstr.initialPC).toEqual 2 # Do not want to check the predicate the first time
expect(loopInstr.instructions[0]).toBeFunctionCall "shouldStop", [], tempName(0)
ifStatement = loopInstr.instructions[1]
expect(ifStatement).toEqual jasmine.any(Evaluator.If)
expect(ifStatement.condition).toHaveSameAST "!!#{tempName(0)}"
expect(ifStatement.thenCase.length).toEqual 1
expect(ifStatement.thenCase[0]).toEqual jasmine.any(Evaluator.Break)
expect(ifStatement.elseCase).toEqual []
expect(loopInstr.instructions[2]).toHaveSameAST "a = 1 + 2"
expect(loopInstr.instructions[3]).toHaveSameAST "a++"
expect(loopInstr.instructions[4]).toEqual jasmine.any(Evaluator.Continue)
it "uses function scope", ->
bytecode = getStatementsBytecode("
do {
var a = 1 + 2;
function b(c) {d};
} while (true);
")
expect(bytecode.declaredVariables).toEqual ["a"]
expect(bytecode.declaredFunctions.length).toEqual 1
expect(bytecode.declaredFunctions[0]).toBeFunctionDef "b", ["c"], "d", null
describe "creating For loops", ->
it "desugars it into a flat loop", ->
bytecode = getStatementsBytecode("
for (i = initVar(); i !== lst().length; i++) {
a.push(i + 1);
}
")
# The initializer should be pulled out before the loop. The loop
# should desugar to:
# temp = lst();
# if (!(i !== temp.length))
# break;
# temp = a.push(i + 1);
# temp;
# i++;
# continue;
t0 = tempName(0)
expect(bytecode.instructions.length).toEqual 3
expect(bytecode.instructions[0]).toBeFunctionCall "initVar", [], t0
expect(bytecode.instructions[1]).toHaveSameAST "i = #{t0}"
loopInstr = bytecode.instructions[2]
expect(loopInstr).toEqual jasmine.any(Evaluator.Loop)
expect(loopInstr.instructions.length).toEqual 6
expect(loopInstr.instructions[0]).toBeFunctionCall "lst", [], t0
ifStatement = loopInstr.instructions[1]
expect(ifStatement).toEqual jasmine.any(Evaluator.If)
expect(ifStatement.condition).toHaveSameAST "!(i !== #{t0}.length)"
expect(ifStatement.thenCase.length).toEqual 1
expect(ifStatement.thenCase[0]).toEqual jasmine.any(Evaluator.Break)
expect(ifStatement.elseCase).toEqual []
expect(loopInstr.instructions[2]).toBeFunctionCall ["a", "'push'"], ["i + 1"], t0
expect(loopInstr.instructions[3]).toHaveSameAST t0
expect(loopInstr.instructions[4]).toHaveSameAST "i++"
expect(loopInstr.instructions[5]).toEqual jasmine.any(Evaluator.Continue)
it "uses function scope", ->
bytecode = getStatementsBytecode("
for (var i = init; i != 0; --i) {
var a = 1 + 2;
function b(c) {d};
};
")
expect(bytecode.declaredVariables).toEqual ["i", "a"]
expect(bytecode.declaredFunctions.length).toEqual 1
expect(bytecode.declaredFunctions[0]).toBeFunctionDef "b", ["c"], "d", null
it "handles empty expressions in loop definition", ->
# No initializer
bytecode = getStatementsBytecode("for (; b; c) {}")
expect(bytecode.instructions.length).toEqual 1 # Loop
forLoop = bytecode.instructions[0]
expect(forLoop).toEqual jasmine.any(Evaluator.Loop)
expect(forLoop.instructions.length).toEqual 3 # Finished test, update, continue
expect(forLoop.instructions[0]).toEqual jasmine.any(Evaluator.If)
expect(forLoop.instructions[0].condition).toHaveSameAST "!b"
expect(forLoop.instructions[0].thenCase).toEqual [jasmine.any(Evaluator.Break)]
expect(forLoop.instructions[0].elseCase).toEqual []
expect(forLoop.instructions[1]).toEqual "c"
expect(forLoop.instructions[2]).toEqual jasmine.any(Evaluator.Continue)
# No finished test
bytecode = getStatementsBytecode("for (a; ; c) {}")
expect(bytecode.instructions.length).toEqual 2 # Initializer and loop
expect(bytecode.instructions[0]).toEqual "a"
forLoop = bytecode.instructions[1]
expect(forLoop).toEqual jasmine.any(Evaluator.Loop)
expect(forLoop.instructions.length).toEqual 2 # Update and continue
expect(forLoop.instructions[0]).toEqual "c"
expect(forLoop.instructions[1]).toEqual jasmine.any(Evaluator.Continue)
# No update
bytecode = getStatementsBytecode("for (a; b; ) {}")
expect(bytecode.instructions.length).toEqual 2 # Initializer and loop
expect(bytecode.instructions[0]).toEqual "a"
forLoop = bytecode.instructions[1]
expect(forLoop).toEqual jasmine.any(Evaluator.Loop)
expect(forLoop.instructions.length).toEqual 2 # Finished test and continue
expect(forLoop.instructions[0]).toEqual jasmine.any(Evaluator.If)
expect(forLoop.instructions[0].condition).toHaveSameAST "!b"
expect(forLoop.instructions[0].thenCase).toEqual [jasmine.any(Evaluator.Break)]
expect(forLoop.instructions[0].elseCase).toEqual []
expect(forLoop.instructions[1]).toEqual jasmine.any(Evaluator.Continue)
describe "creating Try Catch Finally blocks", ->
it "stores the instructions in the try, catch and finally block", ->
bytecode = getStatementsBytecode("
try {
a = 1; b = a + 'hi';
} catch (err) {
c = 2; d;
} finally {
e + f * g
}
")
expect(bytecode.instructions.length).toEqual 1
tryStatement = bytecode.instructions[0]
expect(tryStatement).toEqual jasmine.any(Evaluator.Try)
expect(tryStatement.tryBlock).toHaveSameAST ["a = 1", "b = a + 'hi'"]
expect(tryStatement.catchBlock).toHaveSameAST ["c = 2", "d"]
expect(tryStatement.catchVariable).toEqual "err"
expect(tryStatement.finallyBlock).toHaveSameAST ["e + f * g"]
it "uses function scope", ->
bytecode = getStatementsBytecode("
try {
var a;
function b() {}
} catch (e) {
var c;
function d() {}
} finally {
var e;
function f() {}
}
")
expect(bytecode.declaredVariables).toEqual ['a', 'c', 'e']
expect(bytecode.declaredFunctions.length).toEqual 3
expect(bytecode.declaredFunctions[0]).toBeFunctionDef 'b', [], '', null
expect(bytecode.declaredFunctions[1]).toBeFunctionDef 'd', [], '', null
expect(bytecode.declaredFunctions[2]).toBeFunctionDef 'f', [], '', null
it "handles empty catch blocks", ->
bytecode = getStatementsBytecode("
try {
a; b;
} finally {
c; d;
}
")
expect(bytecode.instructions.length).toEqual 1
tryStatement = bytecode.instructions[0]
expect(tryStatement).toEqual jasmine.any(Evaluator.Try)
expect(tryStatement.tryBlock).toHaveSameAST ["a", "b"]
expect(tryStatement.catchBlock).toBeNull()
expect(tryStatement.catchVariable).toBeNull()
expect(tryStatement.finallyBlock).toHaveSameAST ["c", "d"]
it "handles empty finally blocks", ->
bytecode = getStatementsBytecode("
try {
a; b;
} catch(e) {
c; d;
}
")
expect(bytecode.instructions.length).toEqual 1
tryStatement = bytecode.instructions[0]
expect(tryStatement).toEqual jasmine.any(Evaluator.Try)
expect(tryStatement.tryBlock).toHaveSameAST ["a", "b"]
expect(tryStatement.catchBlock).toHaveSameAST ["c", "d"]
expect(tryStatement.catchVariable).toEqual "e"
expect(tryStatement.finallyBlock).toEqual []
it "creates Throw statements", ->
bytecode = getStatementsBytecode("throw 1 + 2")
expect(bytecode.instructions.length).toEqual 1
expect(bytecode.instructions[0]).toEqual jasmine.any(Evaluator.Throw)
expect(bytecode.instructions[0].error).toHaveSameAST "1 + 2"
describe "when interpreting bytecode", ->
beforeEach ->
@addMatchers
toEvaluateTo: (expected, shouldBeError=false) ->
evaluated = false
didError = false
result = null
evaluator.eval @actual, (res, didErr) ->
evaluated = true
result = res
didError = didErr
@message = =>
expectErrStr = if shouldBeError then "" else "out"
actualErrStr = if didError then "" else "out"
if expected instanceof Error or expected instanceof evaluator.getGlobal("Error")
expFormatted = expected.toString()
else
expFormatted = jasmine.pp(expected)
if result instanceof Error or result instanceof evaluator.getGlobal("Error")
resFormatted = result.toString()
else
resFormatted = jasmine.pp(result)
program = @actual.replace(/\s+/g, " ") # Collapse white spaces
"Expected '#{program}' to evaluate to '#{expFormatted}' with#{expectErrStr} errors, " +
"actually evaluated to '#{resFormatted}' with#{actualErrStr} errors."
evaluated and @env.equals_(result, expected) and didError == shouldBeError
it "uses its context to evaluate non-function expressions", ->
num = 5
testId =
foo: "foo value"
bar: "bar value"
0: "zero value"
9: "num value"
evaluator.setGlobal "num", num
evaluator.setGlobal "testId", testId
# each line may rely on the previous line
expressions = [
["'my string'", "my string"],
["true", true],
["null", null],
["123.45", 123.45],
["1.0e2", 1.0e2],
["/regex/", /regex/],
["testId", testId],
["[1, true, 'hi', testId]", [1, true, "hi", testId]],
["({a: 1})", a: 1 ],
[
"({msg: 'hello', arr: [1,2,3], obj: {foo: 'bar'}})",
msg: "hello", arr: [1, 2, 3], obj: {foo: "bar"}
],
["1, 2, 'red', 'blue'", `(1, 2, "red", "blue")`],
["-num", -5], # num = 5
["+5", 5],
["!'hey'", false],
["typeof testId", "object"],
["void 'hi'", undefined],
["num in testId", false],
["'0' == false", true],
["foo = 12", 12],
["num += 4", 9], # num starts at 5 => num + 4 = 9
["foo++", 12],
["++foo", 14],
["true || false", true],
["true ? ' ' : ''", " "],
["testId.foo", "foo value"],
["testId['bar']", "bar value"],
["testId[0]", "zero value"],
["testId[num]", "num value"],
["(1 + 2) * 3", 9],
["false && true || true", true],
["false && (true || true)", false]
]
for pair in expressions
[inputString, outputValue] = pair
expect(inputString).toEvaluateTo outputValue
it "conditionally executes code in If blocks", ->
program = "
a = 0;
if (val) {
a += 1;
} else {
a += 2;
}
a;
"
evaluator.eval "val = true"
expect(program).toEvaluateTo 1
evaluator.eval "val = false"
expect(program).toEvaluateTo 2
describe "in loops", ->
it "can break out", ->
program = "
a = 0;
while (true) {
break;
a = 1;
}
a;"
expect(program).toEvaluateTo 0
it "can break out of nested blocks", ->
program = "
a = 0;
while (true) {
if (true) break;
a = 1;
}
a;"
expect(program).toEvaluateTo 0
program = "
a = 0;
do {
while (true) {
if (true) break;
a += 1;
}
a += 2
} while (false)
a;"
expect(program).toEvaluateTo 2
it "can continue", ->
program = "
a = 0;
while (true) {
if (a > 0) break;
a++;
continue;
a = 5;
}
a;"
expect(program).toEvaluateTo 1
it "can continue in nested blocks", ->
program = "
a = 0;
while (true) {
if (a > 0) break;
a++;
if (true) continue;
a = 5;
}
a;"
expect(program).toEvaluateTo 1
it "repeats normally", ->
program = "
a = 0;
while (a != 3) {
a++;
}
a;"
expect(program).toEvaluateTo 3