使用CodeMirror实现Python3在线编辑器的示例代码

2019-11-25 13:29:07

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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: Python3/n/n";  var codeAreaTip = "# please edit your code here:/n";  var codeStart = "# code start/n/n";  var codeEnd = "# code end/n/n";  var codeTip = "'''/nThis function is the entry of this program and/nit must be return your answer of current question./n'''/n";  var code = "def solution():/n/tpass";  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 = /[/d/D]*(line/s/d)[/d/D]*?(/w*(?:Error|Exception).*)/im;        let matchArr = reg.exec(err.message);        matchArr.shift();        res.send(matchArr.join(", "));      }      else        res.send(stdout);    });  });});

效果：