var ctx = require('./$.ctx') , invoke = require('./$.invoke') , html = require('./$.html') , cel = require('./$.dom-create') , global = require('./$.global') , process = global.process , setTask = global.setImmediate , clearTask = global.clearImmediate , MessageChannel = global.MessageChannel , counter = 0 , queue = {} , ONREADYSTATECHANGE = 'onreadystatechange' , defer, channel, port; var run = function(){ var id = +this; if(queue.hasOwnProperty(id)){ var fn = queue[id]; delete queue[id]; fn(); } }; var listner = function(event){ run.call(event.data); }; // Node.js 0.9+ & IE10+ has setImmediate, otherwise: if(!setTask || !clearTask){ setTask = function setImmediate(fn){ var args = [], i = 1; while(arguments.length > i)args.push(arguments[i++]); queue[++counter] = function(){ invoke(typeof fn == 'function' ? fn : Function(fn), args); }; defer(counter); return counter; }; clearTask = function clearImmediate(id){ delete queue[id]; }; // Node.js 0.8- if(require('./$.cof')(process) == 'process'){ defer = function(id){ process.nextTick(ctx(run, id, 1)); }; // Browsers with MessageChannel, includes WebWorkers } else if(MessageChannel){ channel = new MessageChannel; port = channel.port2; channel.port1.onmessage = listner; defer = ctx(port.postMessage, port, 1); // Browsers with postMessage, skip WebWorkers // IE8 has postMessage, but it's sync & typeof its postMessage is 'object' } else if(global.addEventListener && typeof postMessage == 'function' && !global.importScripts){ defer = function(id){ global.postMessage(id + '', '*'); }; global.addEventListener('message', listner, false); // IE8- } else if(ONREADYSTATECHANGE in cel('script')){ defer = function(id){ html.appendChild(cel('script'))[ONREADYSTATECHANGE] = function(){ html.removeChild(this); run.call(id); }; }; // Rest old browsers } else { defer = function(id){ setTimeout(ctx(run, id, 1), 0); }; } } module.exports = { set: setTask, clear: clearTask };