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使用CodeMirror实现Python3在线编辑器的示例代码

2018年11月30日 作者：小结点原文

一、编写页面

主要是引入相关的css文件和js文件，这里采用简单插入link和script标签的形式。

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
  <link rel="stylesheet" href="codemirror/lib/codemirror.css" rel="external nofollow" >
  <link rel="stylesheet" href="codemirror/addon/fold/foldgutter.css" rel="external nofollow" >
  <link rel="stylesheet" href="codemirror/addon/hint/show-hint.css" rel="external nofollow" >
  <link rel="stylesheet" href="codemirror/addon/lint/lint.css" rel="external nofollow" >
  <link rel="stylesheet" href="leetcode.css" rel="external nofollow" > 
</head>
<body>
  <form action="">
    <textarea id="editor" class="editor"></textarea>
  </form>  
  <button id="test">click</button>
</body>
</html>
<script src="codemirror/lib/codemirror.js"></script>

<script src="codemirror/addon/comment/comment.js"></script>

<script src="codemirror/addon/selection/active-line.js"></script>

<script src="codemirror/keymap/sublime.js"></script>

<script src="codemirror/addon/hint/show-hint.js"></script>
<script src="codemirror/mode/python/python.js"></script> 

<script src="codemirror/addon/fold/foldcode.js"></script>
<script src="codemirror/addon/fold/foldgutter.js"></script>
<script src="codemirror/addon/fold/brace-fold.js"></script>
<script src="codemirror/addon/fold/indent-fold.js"></script>
<script src="codemirror/addon/fold/comment-fold.js"></script>

<script src="codemirror/addon/edit/closebrackets.js"></script>
<script src="codemirror/addon/edit/matchbrackets.js"></script>

<script src="axios.js"></script>

<script src="index.js"></script>

二、配置CodeMirror

在index.js中配置CodeMirror

window.onload = function () {
  var el = document.getElementById("editor");
  var version = "# version: Python3nn";
  var codeAreaTip = "# please edit your code here:n";
  var codeStart = "# code startnn";
  var codeEnd = "# code endnn";
  var codeTip = "'''nThis function is the entry of this program andnit must be return your answer of current question.n'''n";
  var code = "def solution():ntpass";
  var initValue = version + codeAreaTip + codeStart + codeEnd + codeTip + code;
  var myCodeMirror = CodeMirror.fromTextArea(el, {
    mode: "python", // 语言模式
    theme: "leetcode", // 主题
    keyMap: "sublime", // 快键键风格
    lineNumbers: true, // 显示行号
    smartIndent: true, // 智能缩进
    indentUnit: 4, // 智能缩进单位为4个空格长度
    indentWithTabs: true, // 使用制表符进行智能缩进
    lineWrapping: true, // 
    // 在行槽中添加行号显示器、折叠器、语法检测器
    gutters: ["CodeMirror-linenumbers", "CodeMirror-foldgutter", "CodeMirror-lint-markers"], 
    foldGutter: true, // 启用行槽中的代码折叠
    autofocus: true, // 自动聚焦
    matchBrackets: true, // 匹配结束符号，比如"]、}"
    autoCloseBrackets: true, // 自动闭合符号
    styleActiveLine: true, // 显示选中行的样式
  });
  // 设置初始文本，这个选项也可以在fromTextArea中配置
  myCodeMirror.setOption("value", initValue);
  // 编辑器按键监听
  myCodeMirror.on("keypress", function() {
    // 显示智能提示
    myCodeMirror.showHint(); // 注意，注释了CodeMirror库中show-hint.js第131行的代码（阻止了代码补全，同时提供智能提示）
  });
  var test = document.getElementById("test");
  test.onclick = function() {
    var value = myCodeMirror.getValue();
    axios.post("http://localhost/api/runcode", {
      code: value
    }).then(function(res) {
      console.log(res);
    });
  };
};

三、后台调用python shell

过程如下：

  • 在接收的代码字符串后面添加print(solution())用于打印结果
  • 将第一步处理后的字符串写入一个文件中这里是code/code.py
  • 使用child_process模块的exec方法调用shell执行python code/code.py命令，获取打印结果
const express = require("express");
const { exec } = require("child_process");
const router = express.Router();
router.post("/api/runcode", (req, res) => {
  let code = req.body.code;
  fs.writeFile("code/code.py", code+"nprint(solution())", (err) => {
    let command = "python code/code.py";
    exec(command, (err, stdout, stdin) => {
      if(err){
        let reg = /[dD]*(linesd)[dD]*?(w*(?:Error|Exception).*)/im;
        let matchArr = reg.exec(err.message);
        matchArr.shift();
        res.send(matchArr.join(", "));
      }
      else
        res.send(stdout);
    });
  });
});

效果：

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