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使用CodeMirror實現(xiàn)Python3在線編輯器的示例代碼

更新時間：2019年01月14日 14:53:29 作者：小結(jié)點

這篇文章主要介紹了使用CodeMirror實現(xiàn)Python3在線編輯器的示例代碼，文中通過示例代碼介紹的非常詳細(xì)，對大家的學(xué)習(xí)或者工作具有一定的參考學(xué)習(xí)價值，需要的朋友們下面隨著小編來一起學(xué)習(xí)學(xué)習(xí)吧

一、編寫頁面

主要是引入相關(guān)的css文件和js文件，這里采用簡單插入link和script標(biāo)簽的形式。

<!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", // 語言模式
    theme: "leetcode", // 主題
    keyMap: "sublime", // 快鍵鍵風(fēng)格
    lineNumbers: true, // 顯示行號
    smartIndent: true, // 智能縮進(jìn)
    indentUnit: 4, // 智能縮進(jìn)單位為4個空格長度
    indentWithTabs: true, // 使用制表符進(jìn)行智能縮進(jìn)
    lineWrapping: true, // 
    // 在行槽中添加行號顯示器、折疊器、語法檢測器
    gutters: ["CodeMirror-linenumbers", "CodeMirror-foldgutter", "CodeMirror-lint-markers"], 
    foldGutter: true, // 啟用行槽中的代碼折疊
    autofocus: true, // 自動聚焦
    matchBrackets: true, // 匹配結(jié)束符號，比如"]、}"
    autoCloseBrackets: true, // 自動閉合符號
    styleActiveLine: true, // 顯示選中行的樣式
  });
  // 設(shè)置初始文本，這個選項也可以在fromTextArea中配置
  myCodeMirror.setOption("value", initValue);
  // 編輯器按鍵監(jiān)聽
  myCodeMirror.on("keypress", function() {
    // 顯示智能提示
    myCodeMirror.showHint(); // 注意，注釋了CodeMirror庫中show-hint.js第131行的代碼（阻止了代碼補(bǔ)全，同時提供智能提示）
  });
  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、后臺調(diào)用python shell

過程如下：

在接收的代碼字符串后面添加print(solution())用于打印結(jié)果
將第一步處理后的字符串寫入一個文件中這里是code/code.py
使用child_process模塊的exec方法調(diào)用shell執(zhí)行python code/code.py命令，獲取打印結(jié)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：