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-"use strict";
-
-// Use the fastest means possible to execute a task in its own turn, with
-// priority over other events including IO, animation, reflow, and redraw
-// events in browsers.
-//
-// An exception thrown by a task will permanently interrupt the processing of
-// subsequent tasks. The higher level `asap` function ensures that if an
-// exception is thrown by a task, that the task queue will continue flushing as
-// soon as possible, but if you use `rawAsap` directly, you are responsible to
-// either ensure that no exceptions are thrown from your task, or to manually
-// call `rawAsap.requestFlush` if an exception is thrown.
-module.exports = rawAsap;
-function rawAsap(task) {
- if (!queue.length) {
- requestFlush();
- flushing = true;
- }
- // Equivalent to push, but avoids a function call.
- queue[queue.length] = task;
-}
-
-var queue = [];
-// Once a flush has been requested, no further calls to `requestFlush` are
-// necessary until the next `flush` completes.
-var flushing = false;
-// `requestFlush` is an implementation-specific method that attempts to kick
-// off a `flush` event as quickly as possible. `flush` will attempt to exhaust
-// the event queue before yielding to the browser's own event loop.
-var requestFlush;
-// The position of the next task to execute in the task queue. This is
-// preserved between calls to `flush` so that it can be resumed if
-// a task throws an exception.
-var index = 0;
-// If a task schedules additional tasks recursively, the task queue can grow
-// unbounded. To prevent memory exhaustion, the task queue will periodically
-// truncate already-completed tasks.
-var capacity = 1024;
-
-// The flush function processes all tasks that have been scheduled with
-// `rawAsap` unless and until one of those tasks throws an exception.
-// If a task throws an exception, `flush` ensures that its state will remain
-// consistent and will resume where it left off when called again.
-// However, `flush` does not make any arrangements to be called again if an
-// exception is thrown.
-function flush() {
- while (index < queue.length) {
- var currentIndex = index;
- // Advance the index before calling the task. This ensures that we will
- // begin flushing on the next task the task throws an error.
- index = index + 1;
- queue[currentIndex].call();
- // Prevent leaking memory for long chains of recursive calls to `asap`.
- // If we call `asap` within tasks scheduled by `asap`, the queue will
- // grow, but to avoid an O(n) walk for every task we execute, we don't
- // shift tasks off the queue after they have been executed.
- // Instead, we periodically shift 1024 tasks off the queue.
- if (index > capacity) {
- // Manually shift all values starting at the index back to the
- // beginning of the queue.
- for (var scan = 0, newLength = queue.length - index; scan < newLength; scan++) {
- queue[scan] = queue[scan + index];
- }
- queue.length -= index;
- index = 0;
- }
- }
- queue.length = 0;
- index = 0;
- flushing = false;
-}
-
-// `requestFlush` is implemented using a strategy based on data collected from
-// every available SauceLabs Selenium web driver worker at time of writing.
-// https://docs.google.com/spreadsheets/d/1mG-5UYGup5qxGdEMWkhP6BWCz053NUb2E1QoUTU16uA/edit#gid=783724593
-
-// Safari 6 and 6.1 for desktop, iPad, and iPhone are the only browsers that
-// have WebKitMutationObserver but not un-prefixed MutationObserver.
-// Must use `global` or `self` instead of `window` to work in both frames and web
-// workers. `global` is a provision of Browserify, Mr, Mrs, or Mop.
-
-/* globals self */
-var scope = typeof global !== "undefined" ? global : self;
-var BrowserMutationObserver = scope.MutationObserver || scope.WebKitMutationObserver;
-
-// MutationObservers are desirable because they have high priority and work
-// reliably everywhere they are implemented.
-// They are implemented in all modern browsers.
-//
-// - Android 4-4.3
-// - Chrome 26-34
-// - Firefox 14-29
-// - Internet Explorer 11
-// - iPad Safari 6-7.1
-// - iPhone Safari 7-7.1
-// - Safari 6-7
-if (typeof BrowserMutationObserver === "function") {
- requestFlush = makeRequestCallFromMutationObserver(flush);
-
-// MessageChannels are desirable because they give direct access to the HTML
-// task queue, are implemented in Internet Explorer 10, Safari 5.0-1, and Opera
-// 11-12, and in web workers in many engines.
-// Although message channels yield to any queued rendering and IO tasks, they
-// would be better than imposing the 4ms delay of timers.
-// However, they do not work reliably in Internet Explorer or Safari.
-
-// Internet Explorer 10 is the only browser that has setImmediate but does
-// not have MutationObservers.
-// Although setImmediate yields to the browser's renderer, it would be
-// preferrable to falling back to setTimeout since it does not have
-// the minimum 4ms penalty.
-// Unfortunately there appears to be a bug in Internet Explorer 10 Mobile (and
-// Desktop to a lesser extent) that renders both setImmediate and
-// MessageChannel useless for the purposes of ASAP.
-// https://github.com/kriskowal/q/issues/396
-
-// Timers are implemented universally.
-// We fall back to timers in workers in most engines, and in foreground
-// contexts in the following browsers.
-// However, note that even this simple case requires nuances to operate in a
-// broad spectrum of browsers.
-//
-// - Firefox 3-13
-// - Internet Explorer 6-9
-// - iPad Safari 4.3
-// - Lynx 2.8.7
-} else {
- requestFlush = makeRequestCallFromTimer(flush);
-}
-
-// `requestFlush` requests that the high priority event queue be flushed as
-// soon as possible.
-// This is useful to prevent an error thrown in a task from stalling the event
-// queue if the exception handled by Node.js’s
-// `process.on("uncaughtException")` or by a domain.
-rawAsap.requestFlush = requestFlush;
-
-// To request a high priority event, we induce a mutation observer by toggling
-// the text of a text node between "1" and "-1".
-function makeRequestCallFromMutationObserver(callback) {
- var toggle = 1;
- var observer = new BrowserMutationObserver(callback);
- var node = document.createTextNode("");
- observer.observe(node, {characterData: true});
- return function requestCall() {
- toggle = -toggle;
- node.data = toggle;
- };
-}
-
-// The message channel technique was discovered by Malte Ubl and was the
-// original foundation for this library.
-// http://www.nonblocking.io/2011/06/windownexttick.html
-
-// Safari 6.0.5 (at least) intermittently fails to create message ports on a
-// page's first load. Thankfully, this version of Safari supports
-// MutationObservers, so we don't need to fall back in that case.
-
-// function makeRequestCallFromMessageChannel(callback) {
-// var channel = new MessageChannel();
-// channel.port1.onmessage = callback;
-// return function requestCall() {
-// channel.port2.postMessage(0);
-// };
-// }
-
-// For reasons explained above, we are also unable to use `setImmediate`
-// under any circumstances.
-// Even if we were, there is another bug in Internet Explorer 10.
-// It is not sufficient to assign `setImmediate` to `requestFlush` because
-// `setImmediate` must be called *by name* and therefore must be wrapped in a
-// closure.
-// Never forget.
-
-// function makeRequestCallFromSetImmediate(callback) {
-// return function requestCall() {
-// setImmediate(callback);
-// };
-// }
-
-// Safari 6.0 has a problem where timers will get lost while the user is
-// scrolling. This problem does not impact ASAP because Safari 6.0 supports
-// mutation observers, so that implementation is used instead.
-// However, if we ever elect to use timers in Safari, the prevalent work-around
-// is to add a scroll event listener that calls for a flush.
-
-// `setTimeout` does not call the passed callback if the delay is less than
-// approximately 7 in web workers in Firefox 8 through 18, and sometimes not
-// even then.
-
-function makeRequestCallFromTimer(callback) {
- return function requestCall() {
- // We dispatch a timeout with a specified delay of 0 for engines that
- // can reliably accommodate that request. This will usually be snapped
- // to a 4 milisecond delay, but once we're flushing, there's no delay
- // between events.
- var timeoutHandle = setTimeout(handleTimer, 0);
- // However, since this timer gets frequently dropped in Firefox
- // workers, we enlist an interval handle that will try to fire
- // an event 20 times per second until it succeeds.
- var intervalHandle = setInterval(handleTimer, 50);
-
- function handleTimer() {
- // Whichever timer succeeds will cancel both timers and
- // execute the callback.
- clearTimeout(timeoutHandle);
- clearInterval(intervalHandle);
- callback();
- }
- };
-}
-
-// This is for `asap.js` only.
-// Its name will be periodically randomized to break any code that depends on
-// its existence.
-rawAsap.makeRequestCallFromTimer = makeRequestCallFromTimer;
-
-// ASAP was originally a nextTick shim included in Q. This was factored out
-// into this ASAP package. It was later adapted to RSVP which made further
-// amendments. These decisions, particularly to marginalize MessageChannel and
-// to capture the MutationObserver implementation in a closure, were integrated
-// back into ASAP proper.
-// https://github.com/tildeio/rsvp.js/blob/cddf7232546a9cf858524b75cde6f9edf72620a7/lib/rsvp/asap.js