209 lines
8.9 KiB
JavaScript
209 lines
8.9 KiB
JavaScript
/**
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Some credit for this helper goes to http://github.com/YuzuJS/setImmediate
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*/
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"use strict";
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var root_1 = require('./root');
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var ImmediateDefinition = (function () {
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function ImmediateDefinition(root) {
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this.root = root;
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if (root.setImmediate && typeof root.setImmediate === 'function') {
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this.setImmediate = root.setImmediate.bind(root);
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this.clearImmediate = root.clearImmediate.bind(root);
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}
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else {
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this.nextHandle = 1;
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this.tasksByHandle = {};
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this.currentlyRunningATask = false;
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// Don't get fooled by e.g. browserify environments.
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if (this.canUseProcessNextTick()) {
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// For Node.js before 0.9
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this.setImmediate = this.createProcessNextTickSetImmediate();
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}
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else if (this.canUsePostMessage()) {
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// For non-IE10 modern browsers
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this.setImmediate = this.createPostMessageSetImmediate();
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}
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else if (this.canUseMessageChannel()) {
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// For web workers, where supported
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this.setImmediate = this.createMessageChannelSetImmediate();
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}
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else if (this.canUseReadyStateChange()) {
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// For IE 6–8
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this.setImmediate = this.createReadyStateChangeSetImmediate();
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}
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else {
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// For older browsers
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this.setImmediate = this.createSetTimeoutSetImmediate();
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}
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var ci = function clearImmediate(handle) {
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delete clearImmediate.instance.tasksByHandle[handle];
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};
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ci.instance = this;
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this.clearImmediate = ci;
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}
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}
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ImmediateDefinition.prototype.identify = function (o) {
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return this.root.Object.prototype.toString.call(o);
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};
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ImmediateDefinition.prototype.canUseProcessNextTick = function () {
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return this.identify(this.root.process) === '[object process]';
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};
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ImmediateDefinition.prototype.canUseMessageChannel = function () {
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return Boolean(this.root.MessageChannel);
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};
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ImmediateDefinition.prototype.canUseReadyStateChange = function () {
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var document = this.root.document;
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return Boolean(document && 'onreadystatechange' in document.createElement('script'));
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};
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ImmediateDefinition.prototype.canUsePostMessage = function () {
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var root = this.root;
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// The test against `importScripts` prevents this implementation from being installed inside a web worker,
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// where `root.postMessage` means something completely different and can't be used for this purpose.
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if (root.postMessage && !root.importScripts) {
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var postMessageIsAsynchronous_1 = true;
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var oldOnMessage = root.onmessage;
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root.onmessage = function () {
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postMessageIsAsynchronous_1 = false;
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};
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root.postMessage('', '*');
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root.onmessage = oldOnMessage;
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return postMessageIsAsynchronous_1;
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}
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return false;
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};
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// This function accepts the same arguments as setImmediate, but
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// returns a function that requires no arguments.
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ImmediateDefinition.prototype.partiallyApplied = function (handler) {
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var args = [];
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for (var _i = 1; _i < arguments.length; _i++) {
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args[_i - 1] = arguments[_i];
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}
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var fn = function result() {
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var _a = result, handler = _a.handler, args = _a.args;
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if (typeof handler === 'function') {
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handler.apply(undefined, args);
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}
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else {
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(new Function('' + handler))();
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}
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};
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fn.handler = handler;
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fn.args = args;
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return fn;
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};
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ImmediateDefinition.prototype.addFromSetImmediateArguments = function (args) {
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this.tasksByHandle[this.nextHandle] = this.partiallyApplied.apply(undefined, args);
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return this.nextHandle++;
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};
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ImmediateDefinition.prototype.createProcessNextTickSetImmediate = function () {
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var fn = function setImmediate() {
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var instance = setImmediate.instance;
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var handle = instance.addFromSetImmediateArguments(arguments);
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instance.root.process.nextTick(instance.partiallyApplied(instance.runIfPresent, handle));
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return handle;
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};
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fn.instance = this;
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return fn;
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};
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ImmediateDefinition.prototype.createPostMessageSetImmediate = function () {
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// Installs an event handler on `global` for the `message` event: see
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// * https://developer.mozilla.org/en/DOM/window.postMessage
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// * http://www.whatwg.org/specs/web-apps/current-work/multipage/comms.html#crossDocumentMessages
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var root = this.root;
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var messagePrefix = 'setImmediate$' + root.Math.random() + '$';
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var onGlobalMessage = function globalMessageHandler(event) {
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var instance = globalMessageHandler.instance;
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if (event.source === root &&
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typeof event.data === 'string' &&
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event.data.indexOf(messagePrefix) === 0) {
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instance.runIfPresent(+event.data.slice(messagePrefix.length));
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}
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};
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onGlobalMessage.instance = this;
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root.addEventListener('message', onGlobalMessage, false);
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var fn = function setImmediate() {
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var _a = setImmediate, messagePrefix = _a.messagePrefix, instance = _a.instance;
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var handle = instance.addFromSetImmediateArguments(arguments);
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instance.root.postMessage(messagePrefix + handle, '*');
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return handle;
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};
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fn.instance = this;
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fn.messagePrefix = messagePrefix;
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return fn;
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};
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ImmediateDefinition.prototype.runIfPresent = function (handle) {
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// From the spec: 'Wait until any invocations of this algorithm started before this one have completed.'
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// So if we're currently running a task, we'll need to delay this invocation.
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if (this.currentlyRunningATask) {
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// Delay by doing a setTimeout. setImmediate was tried instead, but in Firefox 7 it generated a
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// 'too much recursion' error.
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this.root.setTimeout(this.partiallyApplied(this.runIfPresent, handle), 0);
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}
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else {
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var task = this.tasksByHandle[handle];
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if (task) {
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this.currentlyRunningATask = true;
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try {
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task();
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}
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finally {
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this.clearImmediate(handle);
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this.currentlyRunningATask = false;
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}
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}
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}
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};
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ImmediateDefinition.prototype.createMessageChannelSetImmediate = function () {
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var _this = this;
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var channel = new this.root.MessageChannel();
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channel.port1.onmessage = function (event) {
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var handle = event.data;
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_this.runIfPresent(handle);
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};
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var fn = function setImmediate() {
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var _a = setImmediate, channel = _a.channel, instance = _a.instance;
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var handle = instance.addFromSetImmediateArguments(arguments);
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channel.port2.postMessage(handle);
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return handle;
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};
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fn.channel = channel;
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fn.instance = this;
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return fn;
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};
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ImmediateDefinition.prototype.createReadyStateChangeSetImmediate = function () {
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var fn = function setImmediate() {
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var instance = setImmediate.instance;
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var root = instance.root;
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var doc = root.document;
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var html = doc.documentElement;
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var handle = instance.addFromSetImmediateArguments(arguments);
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// Create a <script> element; its readystatechange event will be fired asynchronously once it is inserted
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// into the document. Do so, thus queuing up the task. Remember to clean up once it's been called.
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var script = doc.createElement('script');
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script.onreadystatechange = function () {
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instance.runIfPresent(handle);
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script.onreadystatechange = null;
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html.removeChild(script);
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script = null;
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};
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html.appendChild(script);
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return handle;
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};
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fn.instance = this;
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return fn;
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};
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ImmediateDefinition.prototype.createSetTimeoutSetImmediate = function () {
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var fn = function setImmediate() {
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var instance = setImmediate.instance;
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var handle = instance.addFromSetImmediateArguments(arguments);
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instance.root.setTimeout(instance.partiallyApplied(instance.runIfPresent, handle), 0);
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return handle;
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};
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fn.instance = this;
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return fn;
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};
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return ImmediateDefinition;
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}());
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exports.ImmediateDefinition = ImmediateDefinition;
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exports.Immediate = new ImmediateDefinition(root_1.root);
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//# sourceMappingURL=Immediate.js.map
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