### 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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In few words, do the same we were doing before, but extending into the methods, and doing it with the usage of global variables and used methods defined inside our script. Without adding a new dependency or lib.