Permalink
Join GitHub today
GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.
Sign up
Fetching contributors…
Cannot retrieve contributors at this time.
Cannot retrieve contributors at this time
| 'use strict'; | |
| var ensureCallable = function (fn) { | |
| if (typeof fn !== 'function') throw new TypeError(fn + " is not a function"); | |
| return fn; | |
| }; | |
| var byObserver = function (Observer) { | |
| var node = document.createTextNode(''), queue, currentQueue, i = 0; | |
| new Observer(function () { | |
| var callback; | |
| if (!queue) { | |
| if (!currentQueue) return; | |
| queue = currentQueue; | |
| } else if (currentQueue) { | |
| queue = currentQueue.concat(queue); | |
| } | |
| currentQueue = queue; | |
| queue = null; | |
| if (typeof currentQueue === 'function') { | |
| callback = currentQueue; | |
| currentQueue = null; | |
| callback(); | |
| return; | |
| } | |
| node.data = (i = ++i % 2); // Invoke other batch, to handle leftover callbacks in case of crash | |
| while (currentQueue) { | |
| callback = currentQueue.shift(); | |
| if (!currentQueue.length) currentQueue = null; | |
| callback(); | |
| } | |
| }).observe(node, { characterData: true }); | |
| return function (fn) { | |
| ensureCallable(fn); | |
| if (queue) { | |
| if (typeof queue === 'function') queue = [queue, fn]; | |
| else queue.push(fn); | |
| return; | |
| } | |
| queue = fn; | |
| node.data = (i = ++i % 2); | |
| }; | |
| }; | |
| module.exports = (function () { | |
| // Node.js | |
| if ((typeof process === 'object') && process && (typeof process.nextTick === 'function')) { | |
| return process.nextTick; | |
| } | |
| // MutationObserver | |
| if ((typeof document === 'object') && document) { | |
| if (typeof MutationObserver === 'function') return byObserver(MutationObserver); | |
| if (typeof WebKitMutationObserver === 'function') return byObserver(WebKitMutationObserver); | |
| } | |
| // W3C Draft | |
| // http://dvcs.w3.org/hg/webperf/raw-file/tip/specs/setImmediate/Overview.html | |
| if (typeof setImmediate === 'function') { | |
| return function (cb) { setImmediate(ensureCallable(cb)); }; | |
| } | |
| // Wide available standard | |
| if ((typeof setTimeout === 'function') || (typeof setTimeout === 'object')) { | |
| return function (cb) { setTimeout(ensureCallable(cb), 0); }; | |
| } | |
| return null; | |
| }()); |