### cat\src\sinterpreter.js ```javascript /** * ScriptInterpreter Module * * This module parses raw JavaScript code related to a component and structures it into a class-friendly format. * It organizes global variables, methods, function calls, and event listeners for subsequent compilation steps. */ const acorn = require('acorn'); const walk = require('acorn-walk'); /** * Class representing a Script Interpreter. */ class ScriptInterpreter { /** * Create a ScriptInterpreter. */ constructor() { this.globalVariables = []; this.methods = []; this.calls = []; this.eventListeners = { connect: [], disconnect: [], }; this.scriptContent = ''; this.uniqueMethodCounter = 1; } /** * Interpret the provided JavaScript code and extract class components. * * @param {string} scriptContent - The raw JavaScript code to interpret. * @returns {Object} An object containing extracted global variables, methods, calls, and event listeners. * @throws Will throw an error if parsing fails or if a class is detected. */ interpret(scriptContent) { this.scriptContent = scriptContent; this.globalVariables = []; this.methods = []; this.calls = []; this.eventListeners = { connect: [], disconnect: [], }; this.uniqueMethodCounter = 1; try { const ast = acorn.parse(this.scriptContent, { ecmaVersion: 'latest', sourceType: 'script', locations: false, }); // Check for class declarations and expressions walk.simple(ast, { ClassDeclaration: () => { throw new Error('Classes are not supported.'); }, ClassExpression: () => { throw new Error('Classes are not supported.'); } }); this.processAst(ast); return { variables: this.globalVariables, methods: this.methods, calls: this.calls, eventListeners: this.eventListeners, }; } catch (error) { throw new Error(`Failed to interpret script: ${error.message}`); } } /** * Process the Abstract Syntax Tree (AST) to extract class components. * * @param {Object} ast - The AST generated by Acorn. */ processAst(ast) { // Only process top-level nodes (global scope) ast.body.forEach(node => { if (node.type === 'VariableDeclaration') { this.processVariableDeclaration(node); } else if (node.type === 'FunctionDeclaration') { this.processFunctionDeclaration(node); } else if (node.type === 'ExpressionStatement') { this.processExpressionStatement(node); } else if (node.type === 'ImportDeclaration') { this.processImportDeclaration(node); } else { // Ignore other top-level constructs or handle as needed } }); } /** * Process import declarations and treat them as global variables. * * @param {Object} node - The ImportDeclaration node. */ processImportDeclaration(node) { const code = this.generateCode(node); this.globalVariables.push(`${code};`); } /** * Process variable declarations in the global scope. * * @param {Object} node - The VariableDeclaration node. */ processVariableDeclaration(node) { node.declarations.forEach((decl) => { if (decl.init && (decl.init.type === 'ArrowFunctionExpression' || decl.init.type === 'FunctionExpression')) { this.processFunctionExpression(decl, node.kind); } else { this.processGlobalVariable(decl, node.kind); } }); } /** * Process a single global variable declaration. * * @param {Object} decl - The VariableDeclarator node. * @param {string} kind - The kind of variable declaration (var, let, const). */ processGlobalVariable(decl, kind) { const name = decl.id.name; const init = decl.init ? this.generateCode(decl.init) : 'undefined'; // Prefix with 'this.' to assign as a class property this.globalVariables.push(`this.${name} = ${init};`); } /** * Process function declarations in the global scope. * * @param {Object} node - The FunctionDeclaration node. */ processFunctionDeclaration(node) { const name = node.id.name; const params = node.params.map(param => this.generateCode(param)).join(', '); const body = this.generateCode(node.body).trim(); this.methods.push(`${name}(${params}) ${body}`); } /** * Process function expressions (including arrow functions) in the global scope as class methods. * * @param {Object} decl - The VariableDeclarator node containing the function expression. * @param {string} kind - The kind of variable declaration (var, let, const). */ processFunctionExpression(decl, kind) { const name = decl.id.name; const params = decl.init.params.map(param => this.generateCode(param)).join(', '); let methodString = ''; if (decl.init.type === 'FunctionExpression' || decl.init.type === 'ArrowFunctionExpression') { if (decl.init.body.type === 'BlockStatement') { const body = this.generateCode(decl.init.body).trim(); methodString = `${name}(${params}) ${body}`; } else { // Concise arrow function const expression = this.generateCode(decl.init.body).trim(); methodString = `${name}(${params}) { return ${expression}; }`; } this.methods.push(methodString); } } /** * Process expression statements in the global scope. * * @param {Object} node - The ExpressionStatement node. */ processExpressionStatement(node) { const expression = node.expression; try { if (this.isFunctionAssignment(expression)) { this.processFunctionAssignment(expression); } else if (expression.type === 'CallExpression') { if (this.isImmediateFunction(expression)) { this.processImmediateFunction(expression); } else if (this.isEventListener(expression)) { this.processEventListener(expression); } else { this.processFunctionCall(expression); } } } catch (error) { console.error(`Error processing expression statement: ${error.message}`); } } /** * Check if an expression is a function assignment (e.g., window.onload = function() {}). * * @param {Object} expression - The expression node. * @returns {boolean} True if it's a function assignment, false otherwise. */ isFunctionAssignment(expression) { return ( expression.type === 'AssignmentExpression' && (expression.right.type === 'FunctionExpression' || expression.right.type === 'ArrowFunctionExpression') ); } /** * Process function assignments (e.g., window.onload = function() {}). * * @param {Object} expression - The AssignmentExpression node. */ processFunctionAssignment(expression) { const left = this.generateCode(expression.left).trim(); const name = this.generateUniqueMethodName('assignedFunction'); const params = expression.right.params.map(param => this.generateCode(param)).join(', '); let body = ''; if (expression.right.body.type === 'BlockStatement') { body = this.generateCode(expression.right.body).trim(); } else { // Concise arrow function const expressionBody = this.generateCode(expression.right.body).trim(); body = `{ return ${expressionBody}; }`; } this.methods.push(`${name}(${params}) ${body}`); this.calls.push(`${left} = this.${name}.bind(this);`); } /** * Check if a CallExpression node is an event listener. * * @param {Object} expression - The CallExpression node. * @returns {boolean} True if it's an event listener, false otherwise. */ isEventListener(expression) { return ( expression.callee.type === 'MemberExpression' && expression.callee.property.name === 'addEventListener' && expression.arguments.length >= 2 ); } /** * Process event listeners in the global scope. * * @param {Object} expression - The CallExpression node representing the event listener. */ processEventListener(expression) { const element = this.generateCode(expression.callee.object).trim(); const event = this.generateCode(expression.arguments[0]).trim().replace(/^['"]|['"]$/g, ''); let listener = ''; if (expression.arguments[1].type === 'FunctionExpression' || expression.arguments[1].type === 'ArrowFunctionExpression') { const func = expression.arguments[1]; const name = this.generateUniqueMethodName('eventListener'); const params = func.params.map(param => this.generateCode(param)).join(', '); let body = ''; if (func.body.type === 'BlockStatement') { body = this.generateCode(func.body).trim(); } else { // Concise arrow function const expressionBody = this.generateCode(func.body).trim(); body = `{ return ${expressionBody}; }`; } this.methods.push(`${name}(${params}) ${body}`); listener = `this.${name}.bind(this)`; } else if (expression.arguments[1].type === 'Identifier') { // Listener is a named function const listenerName = expression.arguments[1].name; listener = `this.${listenerName}.bind(this)`; } else { // Other types (e.g., bound methods) listener = this.generateCode(expression.arguments[1]).trim(); } // Attach 'this.' if not already present const formattedElement = this.ensureThisPrefix(element); // Add to 'connect' event listeners this.eventListeners.connect.push(`${formattedElement}.addEventListener('${event}', ${listener});`); // Add corresponding remover to 'disconnect' event listeners this.eventListeners.disconnect.push(`${formattedElement}.removeEventListener('${event}', ${listener});`); } /** * Ensures that the given identifier is prefixed with 'this.' if it's not already. * * @param {string} identifier - The identifier to check. * @returns {string} The identifier with 'this.' prefix if needed. */ ensureThisPrefix(identifier) { // If the identifier starts with 'this.', return as is if (/^this\./.test(identifier)) { return identifier; } // Otherwise, prefix with 'this.' return `this.${identifier}`; } /** * Check if a CallExpression node is an Immediately Invoked Function Expression (IIFE). * * @param {Object} expression - The CallExpression node. * @returns {boolean} True if it's an IIFE, false otherwise. */ isImmediateFunction(expression) { return ( (expression.callee.type === 'FunctionExpression' || expression.callee.type === 'ArrowFunctionExpression') && // Allow both named and anonymous function expressions true ); } /** * Process Immediately Invoked Function Expressions (IIFE) in the global scope. * * @param {Object} expression - The CallExpression node representing the IIFE. */ processImmediateFunction(expression) { const name = this.generateUniqueMethodName('immediateFunction'); let params = ''; let args = ''; let body = ''; if (expression.callee.type === 'FunctionExpression' || expression.callee.type === 'ArrowFunctionExpression') { params = expression.callee.params.map(param => this.generateCode(param)).join(', '); if (expression.callee.body.type === 'BlockStatement') { body = this.generateCode(expression.callee.body).trim(); } else { // Concise arrow function const expressionBody = this.generateCode(expression.callee.body).trim(); body = `{ return ${expressionBody}; }`; } } this.methods.push(`${name}(${params}) ${body}`); const callArgs = expression.arguments.map(arg => this.generateCode(arg)).join(', '); this.calls.push(`this.${name}(${callArgs});`); } /** * Process function calls in the global scope. * * @param {Object} expression - The CallExpression node. */ processFunctionCall(expression) { const callExpression = this.generateCode(expression).trim(); this.calls.push(`${callExpression};`); } /** * Generate unique method names to avoid conflicts. * * @param {string} base - The base name for the method. * @returns {string} A unique method name. */ generateUniqueMethodName(base) { const name = `${base}_${this.uniqueMethodCounter}`; this.uniqueMethodCounter += 1; return name; } /** * Generate code from an AST node based on its start and end positions. * * @param {Object} node - The AST node. * @returns {string} The generated code as a string. */ generateCode(node) { return this.scriptContent.slice(node.start, node.end); } } module.exports = ScriptInterpreter; ``` Right now our interpreter it's adding the `this.` correctly for variables, but it's not wiring correctly the script. Sample: Original: let counter = 0; let button = document.getElementById('button'); let ps = document.getElementsByClassName('isap'); const tester = (() => { console.log(counter); }); function method() { tester(); } Interpretated: .... tester() { console.log(counter); } method() { tester(); } Must be: tester() { console.log(this.counter); } method() { this.tester(); another(); <--- for a function or variable that isn't defining within our script doesn't need the this. }

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Our current intepreter works perfect, we just need to address this issue.