js实现简单计算器词法解析语法解析解释器，带可视化界面

本文链接：https://blog.youkuaiyun.com/isyoungboy/article/details/139593956

代码

Lexer是词法解析器

Parser是语法解析器

Interpreter 是ast解释器

可视化页面

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Lexer, Parser, and Interpreter Visualization</title>
    <style>
        body {
            font-family: Arial, sans-serif;
        }
        #input-container {
            margin-bottom: 20px;
        }
        #lexer-output, #parser-output, #interpreter-output {
            border: 1px solid #ccc;
            padding: 10px;
            margin-bottom: 20px;
        }
        #lexer-output h2, #parser-output h2, #interpreter-output h2 {
            margin-top: 0;
        }
        #lexer-tokens, #parser-ast {
            list-style-type: none;
            padding: 0;
        }
        #lexer-tokens li {
            margin-bottom: 5px;
        }
        #parser-ast ul {
            padding-left: 20px;
        }
    </style>
</head>
<body>
    <h1>Lexer, Parser, and Interpreter Visualization</h1>
    <div id="input-container">
        <label for="input">Input Expression:</label>
        <input type="text" id="input" placeholder="Enter expression...">
        <button onclick="processInput()">Process</button>
    </div>
    <div id="lexer-output">
        <h2>Lexer Output:</h2>
        <ul id="lexer-tokens"></ul>
    </div>
    <div id="parser-output">
        <h2>Parser Output (Abstract Syntax Tree):</h2>
        <pre id="parser-ast"></pre>
    </div>
    <div id="