使用CodeMirror实现Python3在线编辑器的示例代码
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:
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