100 lines
2.7 KiB
JavaScript
100 lines
2.7 KiB
JavaScript
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var global = require('../internals/global');
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var fails = require('../internals/fails');
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var classof = require('../internals/classof-raw');
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var bind = require('../internals/bind-context');
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var html = require('../internals/html');
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var createElement = require('../internals/document-create-element');
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var location = global.location;
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var set = global.setImmediate;
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var clear = global.clearImmediate;
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var process = global.process;
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var MessageChannel = global.MessageChannel;
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var Dispatch = global.Dispatch;
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var counter = 0;
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var queue = {};
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var ONREADYSTATECHANGE = 'onreadystatechange';
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var defer, channel, port;
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var run = function (id) {
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// eslint-disable-next-line no-prototype-builtins
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if (queue.hasOwnProperty(id)) {
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var fn = queue[id];
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delete queue[id];
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fn();
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}
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};
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var runner = function (id) {
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return function () {
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run(id);
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};
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};
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var listener = function (event) {
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run(event.data);
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};
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var post = function (id) {
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// old engines have not location.origin
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global.postMessage(id + '', location.protocol + '//' + location.host);
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};
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// Node.js 0.9+ & IE10+ has setImmediate, otherwise:
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if (!set || !clear) {
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set = function setImmediate(fn) {
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var args = [];
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var i = 1;
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while (arguments.length > i) args.push(arguments[i++]);
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queue[++counter] = function () {
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// eslint-disable-next-line no-new-func
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(typeof fn == 'function' ? fn : Function(fn)).apply(undefined, args);
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};
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defer(counter);
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return counter;
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};
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clear = function clearImmediate(id) {
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delete queue[id];
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};
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// Node.js 0.8-
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if (classof(process) == 'process') {
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defer = function (id) {
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process.nextTick(runner(id));
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};
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// Sphere (JS game engine) Dispatch API
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} else if (Dispatch && Dispatch.now) {
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defer = function (id) {
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Dispatch.now(runner(id));
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};
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// Browsers with MessageChannel, includes WebWorkers
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} else if (MessageChannel) {
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channel = new MessageChannel();
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port = channel.port2;
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channel.port1.onmessage = listener;
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defer = bind(port.postMessage, port, 1);
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// Browsers with postMessage, skip WebWorkers
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// IE8 has postMessage, but it's sync & typeof its postMessage is 'object'
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} else if (global.addEventListener && typeof postMessage == 'function' && !global.importScripts && !fails(post)) {
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defer = post;
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global.addEventListener('message', listener, false);
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// IE8-
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} else if (ONREADYSTATECHANGE in createElement('script')) {
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defer = function (id) {
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html.appendChild(createElement('script'))[ONREADYSTATECHANGE] = function () {
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html.removeChild(this);
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run(id);
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};
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};
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// Rest old browsers
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} else {
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defer = function (id) {
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setTimeout(runner(id), 0);
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};
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}
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}
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module.exports = {
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set: set,
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clear: clear
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};
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