{"ast":null,"code":"(function (global, undefined) {\n \"use strict\";\n\n if (global.setImmediate) {\n return;\n }\n\n var nextHandle = 1; // Spec says greater than zero\n\n var tasksByHandle = {};\n var currentlyRunningATask = false;\n var doc = global.document;\n var registerImmediate;\n\n function setImmediate(callback) {\n // Callback can either be a function or a string\n if (typeof callback !== \"function\") {\n callback = new Function(\"\" + callback);\n } // Copy function arguments\n\n\n var args = new Array(arguments.length - 1);\n\n for (var i = 0; i < args.length; i++) {\n args[i] = arguments[i + 1];\n } // Store and register the task\n\n\n var task = {\n callback: callback,\n args: args\n };\n tasksByHandle[nextHandle] = task;\n registerImmediate(nextHandle);\n return nextHandle++;\n }\n\n function clearImmediate(handle) {\n delete tasksByHandle[handle];\n }\n\n function run(task) {\n var callback = task.callback;\n var args = task.args;\n\n switch (args.length) {\n case 0:\n callback();\n break;\n\n case 1:\n callback(args[0]);\n break;\n\n case 2:\n callback(args[0], args[1]);\n break;\n\n case 3:\n callback(args[0], args[1], args[2]);\n break;\n\n default:\n callback.apply(undefined, args);\n break;\n }\n }\n\n function runIfPresent(handle) {\n // From the spec: \"Wait until any invocations of this algorithm started before this one have completed.\"\n // So if we're currently running a task, we'll need to delay this invocation.\n if (currentlyRunningATask) {\n // Delay by doing a setTimeout. setImmediate was tried instead, but in Firefox 7 it generated a\n // \"too much recursion\" error.\n setTimeout(runIfPresent, 0, handle);\n } else {\n var task = tasksByHandle[handle];\n\n if (task) {\n currentlyRunningATask = true;\n\n try {\n run(task);\n } finally {\n clearImmediate(handle);\n currentlyRunningATask = false;\n }\n }\n }\n }\n\n function installNextTickImplementation() {\n registerImmediate = function (handle) {\n process.nextTick(function () {\n runIfPresent(handle);\n });\n };\n }\n\n function canUsePostMessage() {\n // The test against `importScripts` prevents this implementation from being installed inside a web worker,\n // where `global.postMessage` means something completely different and can't be used for this purpose.\n if (global.postMessage && !global.importScripts) {\n var postMessageIsAsynchronous = true;\n var oldOnMessage = global.onmessage;\n\n global.onmessage = function () {\n postMessageIsAsynchronous = false;\n };\n\n global.postMessage(\"\", \"*\");\n global.onmessage = oldOnMessage;\n return postMessageIsAsynchronous;\n }\n }\n\n function installPostMessageImplementation() {\n // Installs an event handler on `global` for the `message` event: see\n // * https://developer.mozilla.org/en/DOM/window.postMessage\n // * http://www.whatwg.org/specs/web-apps/current-work/multipage/comms.html#crossDocumentMessages\n var messagePrefix = \"setImmediate$\" + Math.random() + \"$\";\n\n var onGlobalMessage = function (event) {\n if (event.source === global && typeof event.data === \"string\" && event.data.indexOf(messagePrefix) === 0) {\n runIfPresent(+event.data.slice(messagePrefix.length));\n }\n };\n\n if (global.addEventListener) {\n global.addEventListener(\"message\", onGlobalMessage, false);\n } else {\n global.attachEvent(\"onmessage\", onGlobalMessage);\n }\n\n registerImmediate = function (handle) {\n global.postMessage(messagePrefix + handle, \"*\");\n };\n }\n\n function installMessageChannelImplementation() {\n var channel = new MessageChannel();\n\n channel.port1.onmessage = function (event) {\n var handle = event.data;\n runIfPresent(handle);\n };\n\n registerImmediate = function (handle) {\n channel.port2.postMessage(handle);\n };\n }\n\n function installReadyStateChangeImplementation() {\n var html = doc.documentElement;\n\n registerImmediate = function (handle) {\n // Create a