使用CodeMirror实现Python3在线编辑器

时间 2019-11-15

标签使用 codemirror 实现 python3 python 在线编辑器栏目 Python 繁體版

原文原文链接

1、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。css

<!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">
    <link rel="stylesheet" href="codemirror/addon/fold/foldgutter.css">
    <link rel="stylesheet" href="codemirror/addon/hint/show-hint.css">
    <link rel="stylesheet" href="codemirror/addon/lint/lint.css">
    <link rel="stylesheet" href="leetcode.css">  
</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>

2、配置CodeMirror

在index.js中配置CodeMirrorhtml

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，好比"]、}"
        autoCloseBrackets: true, // 自动闭合符号
        styleActiveLine: true, // 显示选中行的样式
    });
    // 设置初始文本，这个选项也能够在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);
        });
    };
};

3、后台调用python shell

过程以下：python

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：
ios