74 lines
2.1 KiB
JavaScript
74 lines
2.1 KiB
JavaScript
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/** @license MIT License (c) copyright 2010-2014 original author or authors */
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/** @author Brian Cavalier */
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/** @author John Hann */
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/*global process,document,setTimeout,clearTimeout,MutationObserver,WebKitMutationObserver*/
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(function(define) { 'use strict';
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define(function(require) {
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/*jshint maxcomplexity:6*/
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// Sniff "best" async scheduling option
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// Prefer process.nextTick or MutationObserver, then check for
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// setTimeout, and finally vertx, since its the only env that doesn't
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// have setTimeout
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var MutationObs;
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var capturedSetTimeout = typeof setTimeout !== 'undefined' && setTimeout;
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// Default env
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var setTimer = function(f, ms) { return setTimeout(f, ms); };
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var clearTimer = function(t) { return clearTimeout(t); };
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var asap = function (f) { return capturedSetTimeout(f, 0); };
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// Detect specific env
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if (isNode()) { // Node
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asap = function (f) { return process.nextTick(f); };
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} else if (MutationObs = hasMutationObserver()) { // Modern browser
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asap = initMutationObserver(MutationObs);
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} else if (!capturedSetTimeout) { // vert.x
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var vertxRequire = require;
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var vertx = vertxRequire('vertx');
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setTimer = function (f, ms) { return vertx.setTimer(ms, f); };
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clearTimer = vertx.cancelTimer;
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asap = vertx.runOnLoop || vertx.runOnContext;
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}
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return {
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setTimer: setTimer,
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clearTimer: clearTimer,
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asap: asap
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};
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function isNode () {
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return typeof process !== 'undefined' && process !== null &&
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typeof process.nextTick === 'function';
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}
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function hasMutationObserver () {
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return (typeof MutationObserver === 'function' && MutationObserver) ||
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(typeof WebKitMutationObserver === 'function' && WebKitMutationObserver);
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}
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function initMutationObserver(MutationObserver) {
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var scheduled;
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var node = document.createTextNode('');
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var o = new MutationObserver(run);
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o.observe(node, { characterData: true });
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function run() {
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var f = scheduled;
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scheduled = void 0;
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f();
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}
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var i = 0;
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return function (f) {
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scheduled = f;
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node.data = (i ^= 1);
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};
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}
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});
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}(typeof define === 'function' && define.amd ? define : function(factory) { module.exports = factory(require); }));
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