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author | Rebecca Turner <me@re-becca.org> | 2018-05-24 23:31:26 +0300 |
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committer | Rebecca Turner <me@re-becca.org> | 2018-05-24 23:31:38 +0300 |
commit | 0483f5c5deaf18c968a128657923103e49f4e67a (patch) | |
tree | 210f154da2f60938471d96a844dcb32cbda09e2a /node_modules/asap | |
parent | 6c294614d800cb95a49ef1c422fbdde65b0731a2 (diff) |
Flatten dependencies and add dev deps to git
Diffstat (limited to 'node_modules/asap')
-rw-r--r-- | node_modules/asap/CHANGES.md | 70 | ||||
-rw-r--r-- | node_modules/asap/LICENSE.md | 21 | ||||
-rw-r--r-- | node_modules/asap/README.md | 237 | ||||
-rw-r--r-- | node_modules/asap/asap.js | 65 | ||||
-rw-r--r-- | node_modules/asap/browser-asap.js | 66 | ||||
-rw-r--r-- | node_modules/asap/browser-raw.js | 223 | ||||
-rw-r--r-- | node_modules/asap/package.json | 88 | ||||
-rw-r--r-- | node_modules/asap/raw.js | 101 |
8 files changed, 871 insertions, 0 deletions
diff --git a/node_modules/asap/CHANGES.md b/node_modules/asap/CHANGES.md new file mode 100644 index 000000000..f105b9195 --- /dev/null +++ b/node_modules/asap/CHANGES.md @@ -0,0 +1,70 @@ + +## 2.0.6 + +Version 2.0.4 adds support for React Native by clarifying in package.json that +the browser environment does not support Node.js domains. +Why this is necessary, we leave as an exercise for the user. + +## 2.0.3 + +Version 2.0.3 fixes a bug when adjusting the capacity of the task queue. + +## 2.0.1-2.02 + +Version 2.0.1 fixes a bug in the way redirects were expressed that affected the +function of Browserify, but which Mr would tolerate. + +## 2.0.0 + +Version 2 of ASAP is a full rewrite with a few salient changes. +First, the ASAP source is CommonJS only and designed with [Browserify][] and +[Browserify-compatible][Mr] module loaders in mind. + +[Browserify]: https://github.com/substack/node-browserify +[Mr]: https://github.com/montagejs/mr + +The new version has been refactored in two dimensions. +Support for Node.js and browsers have been separated, using Browserify +redirects and ASAP has been divided into two modules. +The "raw" layer depends on the tasks to catch thrown exceptions and unravel +Node.js domains. + +The full implementation of ASAP is loadable as `require("asap")` in both Node.js +and browsers. + +The raw layer that lacks exception handling overhead is loadable as +`require("asap/raw")`. +The interface is the same for both layers. + +Tasks are no longer required to be functions, but can rather be any object that +implements `task.call()`. +With this feature you can recycle task objects to avoid garbage collector churn +and avoid closures in general. + +The implementation has been rigorously documented so that our successors can +understand the scope of the problem that this module solves and all of its +nuances, ensuring that the next generation of implementations know what details +are essential. + +- [asap.js](https://github.com/kriskowal/asap/blob/master/asap.js) +- [raw.js](https://github.com/kriskowal/asap/blob/master/raw.js) +- [browser-asap.js](https://github.com/kriskowal/asap/blob/master/browser-asap.js) +- [browser-raw.js](https://github.com/kriskowal/asap/blob/master/browser-raw.js) + +The new version has also been rigorously tested across a broad spectrum of +browsers, in both the window and worker context. +The following charts capture the browser test results for the most recent +release. +The first chart shows test results for ASAP running in the main window context. +The second chart shows test results for ASAP running in a web worker context. +Test results are inconclusive (grey) on browsers that do not support web +workers. +These data are captured automatically by [Continuous +Integration][]. + +![Browser Compatibility](http://kriskowal-asap.s3-website-us-west-2.amazonaws.com/train/integration-2/saucelabs-results-matrix.svg) + +![Compatibility in Web Workers](http://kriskowal-asap.s3-website-us-west-2.amazonaws.com/train/integration-2/saucelabs-worker-results-matrix.svg) + +[Continuous Integration]: https://github.com/kriskowal/asap/blob/master/CONTRIBUTING.md + diff --git a/node_modules/asap/LICENSE.md b/node_modules/asap/LICENSE.md new file mode 100644 index 000000000..ba18c6139 --- /dev/null +++ b/node_modules/asap/LICENSE.md @@ -0,0 +1,21 @@ + +Copyright 2009–2014 Contributors. All rights reserved. + +Permission is hereby granted, free of charge, to any person obtaining a copy +of this software and associated documentation files (the "Software"), to +deal in the Software without restriction, including without limitation the +rights to use, copy, modify, merge, publish, distribute, sublicense, and/or +sell copies of the Software, and to permit persons to whom the Software is +furnished to do so, subject to the following conditions: + +The above copyright notice and this permission notice shall be included in +all copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING +FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS +IN THE SOFTWARE. + diff --git a/node_modules/asap/README.md b/node_modules/asap/README.md new file mode 100644 index 000000000..452fd8c20 --- /dev/null +++ b/node_modules/asap/README.md @@ -0,0 +1,237 @@ +# ASAP + +[![Build Status](https://travis-ci.org/kriskowal/asap.png?branch=master)](https://travis-ci.org/kriskowal/asap) + +Promise and asynchronous observer libraries, as well as hand-rolled callback +programs and libraries, often need a mechanism to postpone the execution of a +callback until the next available event. +(See [Designing API’s for Asynchrony][Zalgo].) +The `asap` function executes a task **as soon as possible** but not before it +returns, waiting only for the completion of the current event and previously +scheduled tasks. + +```javascript +asap(function () { + // ... +}); +``` + +[Zalgo]: http://blog.izs.me/post/59142742143/designing-apis-for-asynchrony + +This CommonJS package provides an `asap` module that exports a function that +executes a task function *as soon as possible*. + +ASAP strives to schedule events to occur before yielding for IO, reflow, +or redrawing. +Each event receives an independent stack, with only platform code in parent +frames and the events run in the order they are scheduled. + +ASAP provides a fast event queue that will execute tasks until it is +empty before yielding to the JavaScript engine's underlying event-loop. +When a task gets added to a previously empty event queue, ASAP schedules a flush +event, preferring for that event to occur before the JavaScript engine has an +opportunity to perform IO tasks or rendering, thus making the first task and +subsequent tasks semantically indistinguishable. +ASAP uses a variety of techniques to preserve this invariant on different +versions of browsers and Node.js. + +By design, ASAP prevents input events from being handled until the task +queue is empty. +If the process is busy enough, this may cause incoming connection requests to be +dropped, and may cause existing connections to inform the sender to reduce the +transmission rate or stall. +ASAP allows this on the theory that, if there is enough work to do, there is no +sense in looking for trouble. +As a consequence, ASAP can interfere with smooth animation. +If your task should be tied to the rendering loop, consider using +`requestAnimationFrame` instead. +A long sequence of tasks can also effect the long running script dialog. +If this is a problem, you may be able to use ASAP’s cousin `setImmediate` to +break long processes into shorter intervals and periodically allow the browser +to breathe. +`setImmediate` will yield for IO, reflow, and repaint events. +It also returns a handler and can be canceled. +For a `setImmediate` shim, consider [YuzuJS setImmediate][setImmediate]. + +[setImmediate]: https://github.com/YuzuJS/setImmediate + +Take care. +ASAP can sustain infinite recursive calls without warning. +It will not halt from a stack overflow, and it will not consume unbounded +memory. +This is behaviorally equivalent to an infinite loop. +Just as with infinite loops, you can monitor a Node.js process for this behavior +with a heart-beat signal. +As with infinite loops, a very small amount of caution goes a long way to +avoiding problems. + +```javascript +function loop() { + asap(loop); +} +loop(); +``` + +In browsers, if a task throws an exception, it will not interrupt the flushing +of high-priority tasks. +The exception will be postponed to a later, low-priority event to avoid +slow-downs. +In Node.js, if a task throws an exception, ASAP will resume flushing only if—and +only after—the error is handled by `domain.on("error")` or +`process.on("uncaughtException")`. + +## Raw ASAP + +Checking for exceptions comes at a cost. +The package also provides an `asap/raw` module that exports the underlying +implementation which is faster but stalls if a task throws an exception. +This internal version of the ASAP function does not check for errors. +If a task does throw an error, it will stall the event queue unless you manually +call `rawAsap.requestFlush()` before throwing the error, or any time after. + +In Node.js, `asap/raw` also runs all tasks outside any domain. +If you need a task to be bound to your domain, you will have to do it manually. + +```js +if (process.domain) { + task = process.domain.bind(task); +} +rawAsap(task); +``` + +## Tasks + +A task may be any object that implements `call()`. +A function will suffice, but closures tend not to be reusable and can cause +garbage collector churn. +Both `asap` and `rawAsap` accept task objects to give you the option of +recycling task objects or using higher callable object abstractions. +See the `asap` source for an illustration. + + +## Compatibility + +ASAP is tested on Node.js v0.10 and in a broad spectrum of web browsers. +The following charts capture the browser test results for the most recent +release. +The first chart shows test results for ASAP running in the main window context. +The second chart shows test results for ASAP running in a web worker context. +Test results are inconclusive (grey) on browsers that do not support web +workers. +These data are captured automatically by [Continuous +Integration][]. + +[Continuous Integration]: https://github.com/kriskowal/asap/blob/master/CONTRIBUTING.md + +![Browser Compatibility](http://kriskowal-asap.s3-website-us-west-2.amazonaws.com/train/integration-2/saucelabs-results-matrix.svg) + +![Compatibility in Web Workers](http://kriskowal-asap.s3-website-us-west-2.amazonaws.com/train/integration-2/saucelabs-worker-results-matrix.svg) + +## Caveats + +When a task is added to an empty event queue, it is not always possible to +guarantee that the task queue will begin flushing immediately after the current +event. +However, once the task queue begins flushing, it will not yield until the queue +is empty, even if the queue grows while executing tasks. + +The following browsers allow the use of [DOM mutation observers][] to access +the HTML [microtask queue][], and thus begin flushing ASAP's task queue +immediately at the end of the current event loop turn, before any rendering or +IO: + +[microtask queue]: http://www.whatwg.org/specs/web-apps/current-work/multipage/webappapis.html#microtask-queue +[DOM mutation observers]: http://dom.spec.whatwg.org/#mutation-observers + +- 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 + +In the absense of mutation observers, there are a few browsers, and situations +like web workers in some of the above browsers, where [message channels][] +would be a useful way to avoid falling back to timers. +Message channels give direct access to the HTML [task queue][], so the ASAP +task queue would flush after any already queued rendering and IO tasks, but +without having the minimum delay imposed by timers. +However, among these browsers, Internet Explorer 10 and Safari do not reliably +dispatch messages, so they are not worth the trouble to implement. + +[message channels]: http://www.whatwg.org/specs/web-apps/current-work/multipage/web-messaging.html#message-channels +[task queue]: http://www.whatwg.org/specs/web-apps/current-work/multipage/webappapis.html#concept-task + +- Internet Explorer 10 +- Safair 5.0-1 +- Opera 11-12 + +In the absense of mutation observers, these browsers and the following browsers +all fall back to using `setTimeout` and `setInterval` to ensure that a `flush` +occurs. +The implementation uses both and cancels whatever handler loses the race, since +`setTimeout` tends to occasionally skip tasks in unisolated circumstances. +Timers generally delay the flushing of ASAP's task queue for four milliseconds. + +- Firefox 3–13 +- Internet Explorer 6–10 +- iPad Safari 4.3 +- Lynx 2.8.7 + + +## Heritage + +ASAP has been factored out of the [Q][] asynchronous promise library. +It originally had a naïve implementation in terms of `setTimeout`, but +[Malte Ubl][NonBlocking] provided an insight that `postMessage` might be +useful for creating a high-priority, no-delay event dispatch hack. +Since then, Internet Explorer proposed and implemented `setImmediate`. +Robert Katić began contributing to Q by measuring the performance of +the internal implementation of `asap`, paying particular attention to +error recovery. +Domenic, Robert, and Kris Kowal collectively settled on the current strategy of +unrolling the high-priority event queue internally regardless of what strategy +we used to dispatch the potentially lower-priority flush event. +Domenic went on to make ASAP cooperate with Node.js domains. + +[Q]: https://github.com/kriskowal/q +[NonBlocking]: http://www.nonblocking.io/2011/06/windownexttick.html + +For further reading, Nicholas Zakas provided a thorough article on [The +Case for setImmediate][NCZ]. + +[NCZ]: http://www.nczonline.net/blog/2013/07/09/the-case-for-setimmediate/ + +Ember’s RSVP promise implementation later [adopted][RSVP ASAP] the name ASAP but +further developed the implentation. +Particularly, The `MessagePort` implementation was abandoned due to interaction +[problems with Mobile Internet Explorer][IE Problems] in favor of an +implementation backed on the newer and more reliable DOM `MutationObserver` +interface. +These changes were back-ported into this library. + +[IE Problems]: https://github.com/cujojs/when/issues/197 +[RSVP ASAP]: https://github.com/tildeio/rsvp.js/blob/cddf7232546a9cf858524b75cde6f9edf72620a7/lib/rsvp/asap.js + +In addition, ASAP factored into `asap` and `asap/raw`, such that `asap` remained +exception-safe, but `asap/raw` provided a tight kernel that could be used for +tasks that guaranteed that they would not throw exceptions. +This core is useful for promise implementations that capture thrown errors in +rejected promises and do not need a second safety net. +At the same time, the exception handling in `asap` was factored into separate +implementations for Node.js and browsers, using the the [Browserify][Browser +Config] `browser` property in `package.json` to instruct browser module loaders +and bundlers, including [Browserify][], [Mr][], and [Mop][], to use the +browser-only implementation. + +[Browser Config]: https://gist.github.com/defunctzombie/4339901 +[Browserify]: https://github.com/substack/node-browserify +[Mr]: https://github.com/montagejs/mr +[Mop]: https://github.com/montagejs/mop + +## License + +Copyright 2009-2014 by Contributors +MIT License (enclosed) + diff --git a/node_modules/asap/asap.js b/node_modules/asap/asap.js new file mode 100644 index 000000000..f04fcd58f --- /dev/null +++ b/node_modules/asap/asap.js @@ -0,0 +1,65 @@ +"use strict"; + +var rawAsap = require("./raw"); +var freeTasks = []; + +/** + * Calls a task as soon as possible after returning, in its own event, with + * priority over IO events. An exception thrown in a task can be handled by + * `process.on("uncaughtException") or `domain.on("error")`, but will otherwise + * crash the process. If the error is handled, all subsequent tasks will + * resume. + * + * @param {{call}} task A callable object, typically a function that takes no + * arguments. + */ +module.exports = asap; +function asap(task) { + var rawTask; + if (freeTasks.length) { + rawTask = freeTasks.pop(); + } else { + rawTask = new RawTask(); + } + rawTask.task = task; + rawTask.domain = process.domain; + rawAsap(rawTask); +} + +function RawTask() { + this.task = null; + this.domain = null; +} + +RawTask.prototype.call = function () { + if (this.domain) { + this.domain.enter(); + } + var threw = true; + try { + this.task.call(); + threw = false; + // If the task throws an exception (presumably) Node.js restores the + // domain stack for the next event. + if (this.domain) { + this.domain.exit(); + } + } finally { + // We use try/finally and a threw flag to avoid messing up stack traces + // when we catch and release errors. + if (threw) { + // In Node.js, uncaught exceptions are considered fatal errors. + // Re-throw them to interrupt flushing! + // Ensure that flushing continues if an uncaught exception is + // suppressed listening process.on("uncaughtException") or + // domain.on("error"). + rawAsap.requestFlush(); + } + // If the task threw an error, we do not want to exit the domain here. + // Exiting the domain would prevent the domain from catching the error. + this.task = null; + this.domain = null; + freeTasks.push(this); + } +}; + diff --git a/node_modules/asap/browser-asap.js b/node_modules/asap/browser-asap.js new file mode 100644 index 000000000..805c98246 --- /dev/null +++ b/node_modules/asap/browser-asap.js @@ -0,0 +1,66 @@ +"use strict"; + +// rawAsap provides everything we need except exception management. +var rawAsap = require("./raw"); +// RawTasks are recycled to reduce GC churn. +var freeTasks = []; +// We queue errors to ensure they are thrown in right order (FIFO). +// Array-as-queue is good enough here, since we are just dealing with exceptions. +var pendingErrors = []; +var requestErrorThrow = rawAsap.makeRequestCallFromTimer(throwFirstError); + +function throwFirstError() { + if (pendingErrors.length) { + throw pendingErrors.shift(); + } +} + +/** + * Calls a task as soon as possible after returning, in its own event, with priority + * over other events like animation, reflow, and repaint. An error thrown from an + * event will not interrupt, nor even substantially slow down the processing of + * other events, but will be rather postponed to a lower priority event. + * @param {{call}} task A callable object, typically a function that takes no + * arguments. + */ +module.exports = asap; +function asap(task) { + var rawTask; + if (freeTasks.length) { + rawTask = freeTasks.pop(); + } else { + rawTask = new RawTask(); + } + rawTask.task = task; + rawAsap(rawTask); +} + +// We wrap tasks with recyclable task objects. A task object implements +// `call`, just like a function. +function RawTask() { + this.task = null; +} + +// The sole purpose of wrapping the task is to catch the exception and recycle +// the task object after its single use. +RawTask.prototype.call = function () { + try { + this.task.call(); + } catch (error) { + if (asap.onerror) { + // This hook exists purely for testing purposes. + // Its name will be periodically randomized to break any code that + // depends on its existence. + asap.onerror(error); + } else { + // In a web browser, exceptions are not fatal. However, to avoid + // slowing down the queue of pending tasks, we rethrow the error in a + // lower priority turn. + pendingErrors.push(error); + requestErrorThrow(); + } + } finally { + this.task = null; + freeTasks[freeTasks.length] = this; + } +}; diff --git a/node_modules/asap/browser-raw.js b/node_modules/asap/browser-raw.js new file mode 100644 index 000000000..9cee7e32e --- /dev/null +++ b/node_modules/asap/browser-raw.js @@ -0,0 +1,223 @@ +"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 diff --git a/node_modules/asap/package.json b/node_modules/asap/package.json new file mode 100644 index 000000000..6be177dcc --- /dev/null +++ b/node_modules/asap/package.json @@ -0,0 +1,88 @@ +{ + "_from": "asap@^2.0.0", + "_id": "asap@2.0.6", + "_inBundle": false, + "_integrity": "sha1-5QNHYR1+aQlDIIu9r+vLwvuGbUY=", + "_location": "/asap", + "_phantomChildren": {}, + "_requested": { + "type": "range", + "registry": true, + "raw": "asap@^2.0.0", + "name": "asap", + "escapedName": "asap", + "rawSpec": "^2.0.0", + "saveSpec": null, + "fetchSpec": "^2.0.0" + }, + "_requiredBy": [ + "/dezalgo", + "/promise" + ], + "_resolved": "https://registry.npmjs.org/asap/-/asap-2.0.6.tgz", + "_shasum": "e50347611d7e690943208bbdafebcbc2fb866d46", + "_spec": "asap@^2.0.0", + "_where": "/Users/rebecca/code/npm/node_modules/dezalgo", + "browser": { + "./asap": "./browser-asap.js", + "./asap.js": "./browser-asap.js", + "./raw": "./browser-raw.js", + "./raw.js": "./browser-raw.js", + "./test/domain.js": "./test/browser-domain.js" + }, + "bugs": { + "url": "https://github.com/kriskowal/asap/issues" + }, + "bundleDependencies": false, + "deprecated": false, + "description": "High-priority task queue for Node.js and browsers", + "devDependencies": { + "benchmark": "^1.0.0", + "events": "^1.0.1", + "jshint": "^2.5.1", + "knox": "^0.8.10", + "mr": "^2.0.5", + "opener": "^1.3.0", + "q": "^2.0.3", + "q-io": "^2.0.3", + "saucelabs": "^0.1.1", + "wd": "^0.2.21", + "weak-map": "^1.0.5" + }, + "files": [ + "raw.js", + "asap.js", + "browser-raw.js", + "browser-asap.js" + ], + "homepage": "https://github.com/kriskowal/asap#readme", + "keywords": [ + "event", + "task", + "queue" + ], + "license": "MIT", + "main": "./asap.js", + "name": "asap", + "react-native": { + "domain": false + }, + "repository": { + "type": "git", + "url": "git+https://github.com/kriskowal/asap.git" + }, + "scripts": { + "benchmarks": "node benchmarks", + "lint": "jshint raw.js asap.js browser-raw.js browser-asap.js $(find scripts -name '*.js' | grep -v gauntlet)", + "test": "npm run lint && npm run test-node", + "test-browser": "node scripts/publish-bundle.js test/asap-test.js | xargs opener", + "test-node": "node test/asap-test.js", + "test-publish": "node scripts/publish-bundle.js test/asap-test.js | pbcopy", + "test-saucelabs": "node scripts/saucelabs.js test/asap-test.js scripts/saucelabs-spot-configurations.json", + "test-saucelabs-all": "node scripts/saucelabs.js test/asap-test.js scripts/saucelabs-all-configurations.json", + "test-saucelabs-worker": "node scripts/saucelabs-worker-test.js scripts/saucelabs-spot-configurations.json", + "test-saucelabs-worker-all": "node scripts/saucelabs-worker-test.js scripts/saucelabs-all-configurations.json", + "test-travis": "npm run lint && npm run test-node && npm run test-saucelabs && npm run test-saucelabs-worker" + }, + "version": "2.0.6" +} diff --git a/node_modules/asap/raw.js b/node_modules/asap/raw.js new file mode 100644 index 000000000..ae3b89231 --- /dev/null +++ b/node_modules/asap/raw.js @@ -0,0 +1,101 @@ +"use strict"; + +var domain; // The domain module is executed on demand +var hasSetImmediate = typeof setImmediate === "function"; + +// Use the fastest means possible to execute a task in its own turn, with +// priority over other events including network IO events in Node.js. +// +// 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; + } + // 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; +// 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 excaustion, 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; +} + +rawAsap.requestFlush = requestFlush; +function requestFlush() { + // Ensure flushing is not bound to any domain. + // It is not sufficient to exit the domain, because domains exist on a stack. + // To execute code outside of any domain, the following dance is necessary. + var parentDomain = process.domain; + if (parentDomain) { + if (!domain) { + // Lazy execute the domain module. + // Only employed if the user elects to use domains. + domain = require("domain"); + } + domain.active = process.domain = null; + } + + // `setImmediate` is slower that `process.nextTick`, but `process.nextTick` + // cannot handle recursion. + // `requestFlush` will only be called recursively from `asap.js`, to resume + // flushing after an error is thrown into a domain. + // Conveniently, `setImmediate` was introduced in the same version + // `process.nextTick` started throwing recursion errors. + if (flushing && hasSetImmediate) { + setImmediate(flush); + } else { + process.nextTick(flush); + } + + if (parentDomain) { + domain.active = process.domain = parentDomain; + } +} |