JavaScript 解释器，包含词法分析、语法解析和执行。基于 LR 实现 eval.zip

# yzhanJSInterpreter [](https://www.npmjs.com/package/yzhanjsinterpreter) [](https://www.npmjs.com/package/yzhanjsinterpreter) [](https://github.com/mantoufan/yzhanjsinterpreter/blob/main/LICENSE) A JavaScript Interpreter Using JS itself, implement `eval` JavaScript 解释器，包含词法分析、语法解析和执行。实现 `eval` ## Demo You could change JavaScript Code and view the result in realtime. [Online Demo](https://mantoufan.github.io/yzhanJSInterpreter)  ## Setup ### Node.js ```javascript npm i yzhanjsinterpreter import yzhanJSInterpreter from 'yzhanjsinterpreter' ``` ### Browser ```html <script src="https://cdn.jsdelivr.net/npm/yzhanjsinterpreter@latest/docs/yzhanjsinterpreter.min.js"></script> ``` ## Usage ### Declaration Code ```javascript const code = `let a = 1; let b = 1; a <<= b++; for (let i = 0; i < 10; i++) { if (i % 2 === 0) continue; if ((i | 2) == '11') break; a++; } undefined && 1 ?? (0 || a + b);` ``` ### Eval · Evaluate `eval` is a reserved keyword, so use `evaluate` instead ```javascript const evalResult = yzhanJSInterpreter.evaluate(code) ``` `evaluate` runs followed 3 steps: #### 1. Lexical Analyzer ```javascript const lexResult = yzhanJSInterpreter.lex(code) ``` #### 2. Syntax Parser ```javascript const parseResults = yzhanJSInterpreter.parse(lexResult) ``` #### 3. Executor ```javascript const executeResult = yzhanJSInterpreter.execute(parseResults[0]) const evalResult = executeResult ``` ## Development ### Unit Testing ```shell npm test ``` ### Build ```shell npm run build ``` ### Preview ```shell npm run dev ``` ## Todo 1. Travese AST, using child to replace the parent when there is only one parent Node. 2. Treeshaking: earse unseded declarations.