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