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b4e3db625e
This is done by rewriting loop code with a test to see how many times the test has been called. In general, JS is going to run pretty quick, so an infinite loop can rack up 100,000 iterations pretty quickly. If we hit that limit, we break out of the loop and console.error (note: I'd like to echo this back to the user in the UI somehow - probably the linter notice). This way the code continues, it's a little slow, but it *doesn't* crash the browser.
85 lines
2.3 KiB
JavaScript
85 lines
2.3 KiB
JavaScript
var counters = {};
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function infiniteLoopTest(code) {
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var lines = code.split('\n'),
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recompiled = [],
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re = /for\b|while\b|do\b/;
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// reset the counters
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counters = {};
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lines.forEach(function (line, i) {
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var index = 0;
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if (re.test(line)) {
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// try to insert the tracker after the openning brace (like while (true) { ^here^ )
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index = line.indexOf('{');
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if (index !== -1) {
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// parseFor(line, i);
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line = line.substring(0, index + 1) + ';\njsbin.LOOPCOUNT({ line: ' + i + ' });';
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} else {
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index = line.indexOf(')');
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if (index !== -1) {
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// look for a one liner
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var colonIndex = line.substring(index).indexOf(';');
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if (colonIndex !== -1) {
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// in which case, rewrite the loop to add braces
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colonIndex += index;
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line = line.substring(0, index + 1) + '{\njsbin.LOOPCOUNT({ line: ' + i + ' });\n' + line.substring(index + 1) + '}\n';
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;
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}
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}
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}
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counters[i] = { count: 0, last: +new Date() };
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}
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recompiled.push(line);
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});
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return recompiled.join('\n');
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}
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function detect(state) {
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var line = counters[state.line];
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line.count++;
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if (line.count > 100000) {
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// we've done a ton of loops, then let's say it smells like an infinite loop
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throw new Error("Suspicious loop detected at line " + state.line);
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}
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}
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jsbin.LOOPCOUNT = detect;
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if (typeof exports !== 'undefined') {
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module.exports = {
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convert: infiniteLoopTest,
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detect: detect
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};
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}
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// function testForHang(callback) {
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// var worker = new Worker(jsbin.root + '/js/render/infinite-loop-test-worker.js'),
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// timer = null;
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// worker.onmessage = function (e) {
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// clearTimeout(timer);
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// if (e.data.code === 'READY') {
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// timer = setTimeout(function () {
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// worker.terminate();
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// callback(false);
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// }, 100);
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// } else if (e.data.code === 'DONE') {
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// clearTimeout(timer);
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// callback(true);
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// } else if (false && e.data.code === 'ERROR') { // ignore errors for now
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// clearTimeout(timer);
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// callback(false);
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// } else {
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// // console.log('unexpected response from loop worker');
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// callback(true);
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// }
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// };
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// worker.postMessage(jsbin.panels.panels.javascript.getCode());
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// }
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