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index2.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<title>Hello React!</title>
<!--官方提供的 CDN 地址：-->
<script src="./common/js/react.development.v16.12.0.js"></script>
<script src="./common/js/react-dom.development.v16.12.0.js"></script>
<script src="./common/js/browser-polyfill.5.8.38.js"></script>
<script src="./common/js/browser.5.8.38.js"></script>
</head>
<style>
* {
margin: 0;
padding: 0;
}
#text {
/* width: 500px; */
/* height: 300px; */
}
.left-box {
float: left;
width: 45%;
}
.right-box {
float: right;
width: 45%;
height: 700px;
/* background: red; */
}
textarea {
width: 100%;
height: 400px;
}
p {
margin: 20px;
}
button {
width: 80px;
padding: 10px;
}
</style>
<body>
<div class="box">
<div class='left-box'>
<p>代码编辑窗口</p>
<textarea id='text'></textarea>
<button id='but'>
执行Code
</button>
<div id='parser'>
</div>
</div>
<div class='right-box'>
<div>
<p>标准组件demo代码</p>
<textarea>
const H=()=>{
return (<h1> 这 个 是 标 题 1</h1>)
}
class Clock extends React.Component {
constructor (props) {
super(props);
this.state = { date:"2019-1-1", count: 10 };
}
addCount() {
const { count } = this.state;
this.setState({
count: count + 1,
})
}
render() {
const { date, count } = this.state;
return (
<div>
<h1>Hello, world!</h1>
<H/>
<h2>现在是 {date}</h2>
<button onClick={() => this.addCount()}>add1 count</button>
<button onClick={this.addCount.bind(this)}>add2 count</button>
<h2>count {count}</h2>
</div>
);
}
}
export default Clock;
</textarea>
<p>模板组件 demo 代码</p>
<textarea>
render(date,count) {
return (
<div>
<h1>Hello, world!</h1>
<h2>现在是 {date}</h2>
<h2>count {count}</h2>
</div>
);
}
</textarea>
</div>
</div>
</div>
<script type="text/babel">
var text = document.getElementById('text')
var but = document.getElementById('but')
var Tool = {
noop: () => { },
//把字符串 转成真正的js 并且以一个函数形式导出去
createFunction: (code, errors = []) => {
try {
return new Function(code).bind(this)
} catch (err) {
console.log('err', err)
errors.push({ err: err, code: code });
return noop
}
},
getExportDefaulComponentName: (code = '') => {
const exportDefaultComponentNameReg = /export\s+default\s+[a-zA-Z]+/g;
const exportDefault = /export\s+default\s+/g;
let exportDefaultComponentName = code.match(exportDefaultComponentNameReg);
if (exportDefaultComponentName && exportDefaultComponentName.length === 1) {
exportDefaultComponentName = exportDefaultComponentName[0].replace(exportDefault, '')
console.log('exportDefaultComponentName', exportDefaultComponentName)
return {
exportDefaultComponentName,
code: code.replace(exportDefaultComponentNameReg, '')
}
} else if (exportDefaultComponentName && exportDefaultComponentName.length >= 1) {
console.log('\x1B[31m%s\x1B[0m', 'This is export default Only one export is allowed')
// throw ('This is export default Only one export is allowed');
return {}
} else {
console.log('\x1B[31m%s\x1B[0m', 'It is an error not to export default Components')
// throw ('It is an error not to export default Components');
return {}
}
},
checkTemplate: ({
code, tagId, data = {}
}) => {
const classComponentReg = /class\s+[a-zA-Z]+\s+extends\s+React.Component/g;
const templateReg = /render\s*\(.*\)\s*{/g;
const renderHeadCode = code.match(templateReg)
if (classComponentReg.test(code)) {
Tool.componentReactDOMJoin({ code, tagId, data });
} else if (renderHeadCode && renderHeadCode.length >= 1) {
Tool.templateReactDOMJoin({ code, tagId, data, renderHeadCode: renderHeadCode[0] });
}
},
runScript: (newCode) => {
// 执行react 代码
transform.run(newCode)
},
componentReactDOMJoin: ({
code, tagId, data = {}
}) => {
// try {
let { code: newCode = '', exportDefaultComponentName = '' } = Tool.getExportDefaulComponentName(code);
if (!newCode || !exportDefaultComponentName) {
return null;
}
newCode = newCode + '; ReactDOM.render(<' + exportDefaultComponentName + '/>,document.getElementById("' + tagId + '"))'
Tool.runScript(newCode)
return newCode;
// }catch (err) {
// console.log('\x1B[31m%s\x1B[0m', err)
// }
},
getRenderParameterName({
code, tagId, data, renderHeadCode
}) {
const parameter = renderHeadCode.substring(renderHeadCode.indexOf("(") + 1, renderHeadCode.indexOf(")"))
if (parameter.trim() === '') {
console.log('\x1B[31m%s\x1B[0m', 'Please add Template render function parameter')
return {};
}
return {
parameter: parameter.split(','),
code: code.replace(parameter, ''),
renderHeadCode: renderHeadCode.replace(parameter, '')
}
},
checkStateKey: ({ parameter, data }) => {
const errorInfo = [];
const state = {};
let stateStrKey = `{`
parameter.map(key => {
let flag = null;
for (let _key in data) {
if (_key.trim() === key.trim()) {
flag = key;
}
}
if (!flag) {
console.log('\x1B[31m%s\x1B[0m', `error, The data is no ${key} parameter`)
errorInfo.push(`error, The data is no ${key} parameter`)
return false;
}
state[key.trim()] = data[key.trim()];
stateStrKey += `${key},`
})
return errorInfo.length >= 1 ? {} : {
stateStrKey: `${stateStrKey}}`,
state
};
},
templateReact: ({
code, tagId, data, renderHeadCode
}) => {
const { code: newCode, parameter, renderHeadCode: newRenderHeadCode } = Tool.getRenderParameterName({ code, tagId, data, renderHeadCode })
if (!parameter) {
return false;
}
let { state, stateStrKey } = Tool.checkStateKey({ parameter, data });
if (!state) {
return false;
}
state = JSON.stringify(state)
const returnLastStr = newCode.trim().substring(newRenderHeadCode.trim().length);
let renderStr = `
render() {
const ${stateStrKey} = this.state;
${returnLastStr}
`
const template = `
class App extends React.Component {
constructor (props) {
super(props);
this.state = ${
state
}
}
${renderStr}
}
export default App;
`
Tool.componentReactDOMJoin({ code: template, tagId, data });
},
templateReactDOMJoin: ({
code, tagId, data = {}, renderHeadCode
}) => {
Tool.templateReact({ code, tagId, data, renderHeadCode })
},
parseStyle: (code) => {
// const styleStartReg=//g;
// const styleEndReg='<style';
},
reactComponentParser({
code, tagId, data = {}
}) {
if (!code.trim()) {
console.log('\x1B[31m%s\x1B[0m', 'Please enter the react code')
return false;
}
if (!tagId.trim()) {
console.log('\x1B[31m%s\x1B[0m', 'Please write tagId')
return false;
}
// Tool.parseStyle(code);
Tool.checkTemplate({
code, tagId, data
});
}
}
but.addEventListener('click', () => {
Tool.reactComponentParser({
code: text.value,
// code: code2,
tagId: 'parser',
data: {
date: new Date(),
count: 100
}
});
})
</script>
</body>
</html>