75 lines
2.2 KiB
JavaScript
75 lines
2.2 KiB
JavaScript
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var ctx = require('./$.ctx')
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, invoke = require('./$.invoke')
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, html = require('./$.html')
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, cel = require('./$.dom-create')
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, global = require('./$.global')
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, process = global.process
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, setTask = global.setImmediate
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, clearTask = global.clearImmediate
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, MessageChannel = global.MessageChannel
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, counter = 0
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, queue = {}
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, ONREADYSTATECHANGE = 'onreadystatechange'
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, defer, channel, port;
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var run = function(){
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var id = +this;
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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 listner = function(event){
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run.call(event.data);
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};
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// Node.js 0.9+ & IE10+ has setImmediate, otherwise:
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if(!setTask || !clearTask){
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setTask = function setImmediate(fn){
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var args = [], 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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invoke(typeof fn == 'function' ? fn : Function(fn), 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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clearTask = 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(require('./$.cof')(process) == 'process'){
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defer = function(id){
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process.nextTick(ctx(run, id, 1));
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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 = listner;
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defer = ctx(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){
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defer = function(id){
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global.postMessage(id + '', '*');
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};
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global.addEventListener('message', listner, false);
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// IE8-
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} else if(ONREADYSTATECHANGE in cel('script')){
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defer = function(id){
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html.appendChild(cel('script'))[ONREADYSTATECHANGE] = function(){
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html.removeChild(this);
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run.call(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(ctx(run, id, 1), 0);
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};
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}
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}
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module.exports = {
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set: setTask,
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clear: clearTask
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};
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