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https://github.com/Jermolene/TiddlyWiki5
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226 lines
6.1 KiB
HTML
226 lines
6.1 KiB
HTML
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8">
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<title>Esprima: Operator Precedence Demo</title>
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<script src="../esprima.js"></script>
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<script src="../assets/json2.js"></script>
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<link rel="stylesheet" type="text/css" href="../assets/style.css"/>
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<style>
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#a, #b, #expr {
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font-size: 16px;
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padding: 5px;
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margin: 5px;
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border: 1px solid #ccc;
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}
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#expr {
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border: none;
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}
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#answer {
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color: white;
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padding: 5px;
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margin: 20px;
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}
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.yes {
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background-color: #228B22;
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}
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.no {
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background-color: #8B2500;
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}
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.lightred {
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background-color: #FFC0CB;
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}
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</style>
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<script>
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/*jslint sloppy:true browser:true */
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/*global esprima:true */
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var compareId;
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function compare() {
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if (compareId) {
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window.clearTimeout(compareId);
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}
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function stringify(node) {
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var result;
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if (typeof node !== 'object') {
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throw new Error('Node is not valid');
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}
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if (typeof node.type !== 'string') {
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throw new Error('Node does not have type property');
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}
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switch (node.type) {
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case 'Program':
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if (node.body.length !== 1) {
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throw new Error('Expression is too complex');
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}
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result = stringify(node.body[0]);
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if (result[0] === '(' && result[result.length - 1] === ')') {
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result = result.substr(1, result.length - 2);
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}
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break;
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case 'ExpressionStatement':
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result = stringify(node.expression);
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break;
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case 'BinaryExpression':
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case 'LogicalExpression':
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result = '(' + stringify(node.left) + ' ' + node.operator + ' ' + stringify(node.right) + ')';
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break;
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case 'UnaryExpression':
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result = '(' + node.operator;
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if (node.operator.length > 2) {
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// delete void typeof
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result += ' ';
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}
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result += stringify(node.argument) + ')';
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break;
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case 'UpdateExpression':
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result = stringify(node.argument);
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if (node.prefix) {
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result = node.operator + result;
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} else {
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result = result + node.operator;
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}
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result = '(' + result + ')';
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break;
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case 'Literal':
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result = node.value.toString();
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if (typeof node.value === 'string') {
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result = '"' + node.value + '"';
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}
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break;
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case 'Identifier':
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result = node.name;
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break;
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default:
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break;
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}
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if (!result) {
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throw new Error('Unknown node type: ' + node.type);
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}
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return result;
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}
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function setText(el, str) {
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if (typeof el.innerText === 'string') {
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el.innerText = str;
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} else {
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el.textContent = str;
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}
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}
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compareId = window.setTimeout(function () {
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var a, b, answer, status, expr, left, right, suggest;
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a = document.getElementById('a');
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b = document.getElementById('b');
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answer = document.getElementById('answer');
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status = document.getElementById('status');
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expr = document.getElementById('expr');
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a.setAttribute('class', '');
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b.setAttribute('class', '');
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answer.setAttribute('class', '');
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setText(answer, '');
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setText(status, '');
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setText(expr, '');
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try {
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left = esprima.parse((typeof a.innerText === 'string') ? a.innerText : a.textContent);
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} catch (e_left) {
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a.setAttribute('class', 'lightred');
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}
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try {
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right = esprima.parse((typeof b.innerText === 'string') ? b.innerText : b.textContent);
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} catch (e_right) {
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b.setAttribute('class', 'lightred');
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}
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try {
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suggest = stringify(left);
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} catch (e_suggest) {
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a.setAttribute('class', 'lightred');
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}
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if (left && right) {
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if (JSON.stringify(left) === JSON.stringify(right)) {
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setText(answer, 'Yes');
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answer.setAttribute('class', 'yes');
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} else {
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setText(answer, 'No');
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answer.setAttribute('class', 'no');
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setText(status, suggest ? 'It is more like ' : '');
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setText(expr, suggest || '');
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}
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} else {
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answer.setAttribute('class', '');
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}
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compareId = undefined;
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}, 57);
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}
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</script>
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</head>
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<body>
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<div class="container">
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<div class="topbar">
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<ul class="nav">
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<li><a href="../index.html">← Home</a></li>
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<li><a href="http://github.com/ariya/esprima">Code</a></li>
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<li><a href="http://wiki.esprima.org">Documentation</a></li>
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<li><a href="http://issues.esprima.org">Issues</a></li>
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</ul>
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</div>
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<h1>Operator precedence <small>is not always easy</small></h1>
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<p>Is <code id="a" contenteditable="true">1 << 2 * 3</code> semantically equivalent to
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<code id="b" contenteditable="true">(1 << 2) * 3</code>? <span id="answer"></span></p>
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<p style="margin-top: 40px;"><span id="status"></span> <code id="expr"></code></p>
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<p style="margin-top: 60px;">This demo is inspired by <a href="http://mothereff.in/operator-precedence">mothereff.in/operator-precedence</a>.</p>
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<div class="footer"><strong>Esprima</strong> is created by
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<a href="http://ariya.ofilabs.com/about" target="_blank">Ariya Hidayat</a>. Follow <a href="http://twitter.com/ariyahidayat">@ariyahidayat</a> on Twitter.
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</div>
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</div>
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<script>
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if (typeof document.body.attachEvent === 'object') {
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// Workaround for old Internet Explorer.
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// Until there is a reliable way to track the modification to the editable
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// inputs, manually track the change periodically.
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window.setInterval(compare, 500);
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}
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// See http://mathiasbynens.be/notes/oninput for details.
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document.getElementById('a').onkeyup = compare;
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document.getElementById('a').oninput = function () {
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this.onkeyup = null;
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compare();
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};
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document.getElementById('b').onkeyup = compare;
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document.getElementById('b').oninput = function () {
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this.onkeyup = null;
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compare();
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};
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compare();
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</script>
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</body>
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</html>
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