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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>JSDoc: Source: lib/compiler/expressionParser.js</title>
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<!--[if lt IE 9]>
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<div id="main">
<h1 class="page-title">Source: lib/compiler/expressionParser.js</h1>
<section>
<article>
<pre class="prettyprint source linenums"><code>import { AvenxErrorCodes } from '../core/runtime/AvenxError.js';
import { TemplateValidationError } from './errors/TemplateValidationError.js';
import { reportWarning } from './utils/warningReporter.js';
/**
* ExpressionParser is responsible for extracting state, computed properties,
* and methods from Avenx component source code.
*/
class ExpressionParser {
/**
* @param {object} [config] - Project configuration object.
*/
constructor(config = null) {
this.config = config;
}
/**
* Extracts the initial state from <state /> tags.
* @param {string} content - The component source code.
* @param {object} [config] - Optional override configuration object.
* @returns {object} The extracted state object.
*/
parseState(content, config = null) {
const activeConfig = config || this.config;
const state = {};
const stateTags = content.match(/<state\s+[\s\S]*?\s*\/>/g) || [];
if (stateTags.length > 1) {
const secondIdx = content.indexOf(stateTags[1]);
const err = new TemplateValidationError(AvenxErrorCodes.COMPILER_MULTIPLE_STATE_TAGS);
if (secondIdx >= 0) {
err.setLocation({ source: content, index: secondIdx });
}
reportWarning(
AvenxErrorCodes.COMPILER_MULTIPLE_STATE_TAGS,
err,
activeConfig,
);
}
const match = content.match(/<state\s+([\s\S]*?)\s*\/>/);
if (match) {
const attrRegex = /(\w+)\s*=\s*(?:"([^"]*)"|'([^']*)')/g;
let m;
while ((m = attrRegex.exec(match[1])) !== null) {
const k = m[1];
const val = m[2] !== undefined ? m[2] : m[3];
state[k] = this.#coerceValue(val);
}
}
return state;
}
/**
* Coerces a string value to its proper JavaScript type.
* @param {string} val - The raw string value.
* @returns {any} The coerced value.
* @private
*/
#coerceValue(val) {
const trimmed = val.trim();
if (trimmed === 'true') return true;
if (trimmed === 'false') return false;
if (trimmed === 'null') return null;
if (trimmed !== '' && !isNaN(trimmed)) return Number(trimmed);
try {
return JSON.parse(val);
} catch {
try {
return JSON.parse(val.replace(/'/g, '"'));
} catch {
return val;
}
}
}
/**
* Extracts computed property definitions from <computed /> tags.
* @param {string} content - The component source code.
* @returns {object} A map of computed property names to their expressions.
*/
parseComputed(content) {
const computed = {};
const regex = /<computed\s+([\s\S]*?)\s*\/>/g;
let m;
while ((m = regex.exec(content)) !== null) {
const attrRegex = /(\w+)\s*=\s*(?:"([^"]*)"|'([^']*)')/g;
let attrMatch;
let name = null;
let value = null;
while ((attrMatch = attrRegex.exec(m[1])) !== null) {
const k = attrMatch[1];
const val = attrMatch[2] !== undefined ? attrMatch[2] : attrMatch[3];
if (k === 'name') name = val;
if (k === 'value') value = val;
}
if (name && value !== null) {
computed[name] = value;
}
}
return computed;
}
/**
* Extracts method definitions from <action /> tags.
* @param {string} content - The component source code.
* @returns {object} A map of method names to their source code.
*/
parseMethods(content) {
const methods = {};
const actionRegex = /<action\s+([\s\S]*?)>([\s\S]*?)<\/action>/g;
let m;
while ((m = actionRegex.exec(content)) !== null) {
const attrs = m[1];
const body = m[2];
const attrRegex = /(\w+)\s*=\s*(?:"([^"]*)"|'([^']*)')/g;
let attrMatch;
let name = null;
while ((attrMatch = attrRegex.exec(attrs)) !== null) {
const k = attrMatch[1];
const val = attrMatch[2] !== undefined ? attrMatch[2] : attrMatch[3];
if (k === 'name') {
name = val;
break;
}
}
if (name) {
methods[name] = body.trim();
}
}
return methods;
}
/**
* Extracts resource definitions from <resource /> tags.
* @param {string} content - The component source code.
* @returns {object} A map of resource names to their handler expressions.
*/
parseResources(content) {
const resources = {};
// 1. Block syntax: <resource name="xxx" pollInterval="5000">body</resource>
const blockRegex = /<resource\s+([\s\S]*?)>([\s\S]*?)<\/resource>/g;
let bm;
while ((bm = blockRegex.exec(content)) !== null) {
const attrs = bm[1];
const body = bm[2];
const attrRegex = /(?::)?(\w+)\s*=\s*(?:"([^"]*)"|'([^']*)')/g;
let attrMatch;
let name = null;
let pollInterval = null;
while ((attrMatch = attrRegex.exec(attrs)) !== null) {
const k = attrMatch[1];
const val = attrMatch[2] !== undefined ? attrMatch[2] : attrMatch[3];
if (k === 'name') {
name = val;
} else if (k === 'pollInterval') {
pollInterval = Number(val);
}
}
if (name) {
let cleanBody = body.trim();
if (!cleanBody.startsWith('return') && !cleanBody.includes(';')) {
cleanBody = `return ${cleanBody};`;
}
if (pollInterval !== null && !isNaN(pollInterval) && pollInterval > 0) {
resources[name] = { handler: cleanBody, pollInterval };
} else {
resources[name] = cleanBody;
}
}
}
// 2. Self-closing syntax: <resource name="xxx" handler="..." pollInterval="5000" />
const selfClosingRegex = /<resource\s+([\s\S]*?)\s*\/>/g;
let sm;
while ((sm = selfClosingRegex.exec(content)) !== null) {
const attrRegex = /(?::)?(\w+)\s*=\s*(?:"([^"]*)"|'([^']*)')/g;
let attrMatch;
let name = null;
let handler = null;
let pollInterval = null;
while ((attrMatch = attrRegex.exec(sm[1])) !== null) {
const k = attrMatch[1];
const val = attrMatch[2] !== undefined ? attrMatch[2] : attrMatch[3];
if (k === 'name') name = val;
if (k === 'handler') handler = val;
if (k === 'pollInterval') pollInterval = Number(val);
}
if (name && handler !== null) {
if (pollInterval !== null && !isNaN(pollInterval) && pollInterval > 0) {
resources[name] = { handler, pollInterval };
} else {
resources[name] = handler;
}
}
}
return resources;
}
/**
* Parses dynamic attribute name binding expressions matching ^:\[(.*)\]$.
* @param {string} attrName - The attribute name (e.g. ":[dynamicAttr]").
* @param {string} [attrValue] - The attribute value expression.
* @returns {object|null} Metadata object containing expression details or null if not a dynamic attribute.
*/
parseDynamicAttribute(attrName, attrValue = '') {
if (!attrName) return null;
const match = attrName.match(/^:\[(.*)\]$/);
if (!match) return null;
return {
isDynamicName: true,
nameExpr: match[1],
valueExpr: attrValue,
};
}
}
export default ExpressionParser;
</code></pre>
</article>
</section>
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