utils: refactor nexttick module.
This commit is contained in:
Christopher Jeffrey
parent
055e811333
commit
edb5bb73af
@ -1,9 +1,255 @@
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/*!
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* nexttick.js - setimmediate for bcoin
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* Copyright (c) 2014-2017, Christopher Jeffrey (MIT License).
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* nexttick.js - nexttick for bcoin
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* Copyright (c) 2017, Christopher Jeffrey (MIT License).
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* https://github.com/bcoin-org/bcoin
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*
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* Parts of this software are based on setimmediate.
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*
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* Copyright (c) 2012 Barnesandnoble.com, llc, Donavon West, and Domenic Denicola
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the 'Software'), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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'use strict';
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module.exports = require('../../vendor/setimmediate');
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var global = (function() {
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if (this)
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return this;
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if (typeof window !== 'undefined')
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return window;
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if (typeof self !== 'undefined')
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return self;
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if (typeof global !== 'undefined')
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return global;
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throw new Error('No global defined.');
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})();
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var document = global.document;
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var nextHandle = 1;
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var taskMap = {};
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var running = false;
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var nextTick;
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/*
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* Task Runner
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*/
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function addTask(handler) {
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if (typeof handler !== 'function')
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throw new Error('callback must be a function.');
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taskMap[nextHandle] = handler;
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return nextHandle++;
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}
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function runTask(handle) {
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var task;
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if (running) {
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setTimeout(function() {
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runTask(handle);
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}, 1);
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return;
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}
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task = taskMap[handle];
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if (task) {
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running = true;
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try {
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task();
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} finally {
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delete taskMap[handle];
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running = false;
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}
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}
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}
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/*
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* Set Immediate Implementation
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*/
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function hasSetImmediate() {
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return typeof global.setImmediate === 'function';
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}
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function installSetImmediate() {
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return function nextTick(handler) {
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setImmediate(handler);
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};
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}
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/*
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* Next Tick Implementation
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*/
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function hasNextTick() {
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// Don't get fooled by browserify.
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return ({}).toString.call(global.process) === '[object process]';
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}
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function installNextTick() {
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return process.nextTick;
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}
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/*
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* Post Message Implementation
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*/
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function hasPostMessage() {
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var isAsync = false;
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var onMessage;
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// Be sure to exclude web workers.
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if (global.postMessage && !global.importScripts) {
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isAsync = true;
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onMessage = global.onmessage;
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global.onmessage = function() {
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isAsync = false;
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};
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global.postMessage('', '*');
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global.onmessage = onMessage;
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}
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return isAsync;
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}
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function installPostMessage() {
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var prefix = 'nextTick' + Math.random();
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var onMessage;
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onMessage = function(event) {
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if (event.source === global
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&& typeof event.data === 'string'
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&& event.data.indexOf(prefix) === 0) {
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runTask(+event.data.slice(prefix.length));
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}
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};
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if (global.addEventListener)
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global.addEventListener('message', onMessage, false);
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else
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global.attachEvent('onmessage', onMessage);
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return function nextTick(handler) {
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var handle = addTask(handler);
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global.postMessage(prefix + handle, '*');
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};
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}
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/*
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* Message Channel Implementation
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*/
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function hasMessageChannel() {
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return typeof global.MessageChannel === 'function';
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}
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function installMessageChannel() {
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var channel = new MessageChannel();
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channel.port1.onmessage = function(event) {
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runTask(event.data);
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};
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return function nextTick(handler) {
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var handle = addTask(handler);
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channel.port2.postMessage(handle);
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};
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}
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/*
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* Ready State Change Implementation
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*/
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function hasReadyState() {
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return document && ('onreadystatechange' in document.createElement('script'));
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}
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function installReadyState() {
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var html = document.documentElement;
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return function nextTick(handler) {
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var handle = addTask(handler);
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var script = document.createElement('script');
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script.onreadystatechange = function() {
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runTask(handle);
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script.onreadystatechange = null;
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html.removeChild(script);
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script = null;
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};
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html.appendChild(script);
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};
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}
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/*
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* Set Timeout Implementation
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*/
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function hasSetTimeout() {
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return typeof global.setTimeout === 'function';
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}
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function installSetTimeout() {
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return function nextTick(handler) {
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var handle = addTask(handler);
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setTimeout(function() {
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runTask(handle);
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}, 1);
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};
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}
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/*
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* Install
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*/
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if (hasSetImmediate()) {
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// `setImmediate` is already available.
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nextTick = installSetImmediate();
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} else if (hasNextTick()) {
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// For Node.js before 0.9.
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nextTick = installNextTick();
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} else if (hasPostMessage()) {
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// For non-IE10 modern browsers.
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nextTick = installPostMessage();
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} else if (hasMessageChannel()) {
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// For web workers, where supported.
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nextTick = installMessageChannel();
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} else if (hasReadyState()) {
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// For IE 6–8.
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nextTick = installReadyState();
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} else if (hasSetTimeout()) {
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// For older browsers.
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nextTick = installSetTimeout();
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} else {
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throw new Error('nextTick not supported.');
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}
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/*
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* Expose
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*/
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module.exports = nextTick;
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@ -6,6 +6,6 @@
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'use strict';
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module.exports = typeof setImmediate !== 'function'
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? process.nextTick
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: setImmediate;
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module.exports = function nextTick(handler) {
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setImmediate(handler);
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};
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208
vendor/setimmediate.js
vendored
208
vendor/setimmediate.js
vendored
@ -1,208 +0,0 @@
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/*!
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* Copyright (c) 2012 Barnesandnoble.com, llc, Donavon West, and Domenic Denicola
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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(function(root, undefined) {
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"use strict";
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var global;
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if (typeof window !== "undefined")
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global = window;
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else if (typeof self !== "undefined")
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global = self;
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else
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global = root;
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if (!global)
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throw new Error("Global not found.");
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function install() {
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if (global.setImmediate) {
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return global.setImmediate;
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}
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var nextHandle = 1; // Spec says greater than zero
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var tasksByHandle = {};
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var currentlyRunningATask = false;
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var doc = global.document;
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var setImmediate;
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function addFromSetImmediateArguments(args) {
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tasksByHandle[nextHandle] = partiallyApplied.apply(undefined, args);
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return nextHandle++;
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}
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// This function accepts the same arguments as setImmediate, but
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// returns a function that requires no arguments.
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function partiallyApplied(handler) {
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var args = [].slice.call(arguments, 1);
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return function() {
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if (typeof handler === "function") {
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handler.apply(undefined, args);
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} else {
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(new Function("" + handler))();
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}
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};
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}
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function runIfPresent(handle) {
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// From the spec: "Wait until any invocations of this algorithm started before this one have completed."
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// So if we're currently running a task, we'll need to delay this invocation.
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if (currentlyRunningATask) {
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// Delay by doing a setTimeout. setImmediate was tried instead, but in Firefox 7 it generated a
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// "too much recursion" error.
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setTimeout(partiallyApplied(runIfPresent, handle), 0);
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} else {
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var task = tasksByHandle[handle];
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if (task) {
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currentlyRunningATask = true;
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try {
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task();
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} finally {
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clearImmediate(handle);
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currentlyRunningATask = false;
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}
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}
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}
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}
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function clearImmediate(handle) {
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delete tasksByHandle[handle];
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}
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function installNextTickImplementation() {
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setImmediate = function() {
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var handle = addFromSetImmediateArguments(arguments);
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process.nextTick(partiallyApplied(runIfPresent, handle));
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return handle;
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};
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}
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function canUsePostMessage() {
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// The test against `importScripts` prevents this implementation from being installed inside a web worker,
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// where `global.postMessage` means something completely different and can't be used for this purpose.
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if (global.postMessage && !global.importScripts) {
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var postMessageIsAsynchronous = true;
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var oldOnMessage = global.onmessage;
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global.onmessage = function() {
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postMessageIsAsynchronous = false;
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};
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global.postMessage("", "*");
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global.onmessage = oldOnMessage;
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return postMessageIsAsynchronous;
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}
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}
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function installPostMessageImplementation() {
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// Installs an event handler on `global` for the `message` event: see
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// * https://developer.mozilla.org/en/DOM/window.postMessage
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// * http://www.whatwg.org/specs/web-apps/current-work/multipage/comms.html#crossDocumentMessages
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var messagePrefix = "setImmediate$" + Math.random() + "$";
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var onGlobalMessage = function(event) {
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if (event.source === global &&
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typeof event.data === "string" &&
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event.data.indexOf(messagePrefix) === 0) {
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runIfPresent(+event.data.slice(messagePrefix.length));
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}
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};
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if (global.addEventListener) {
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global.addEventListener("message", onGlobalMessage, false);
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} else {
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global.attachEvent("onmessage", onGlobalMessage);
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}
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setImmediate = function() {
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var handle = addFromSetImmediateArguments(arguments);
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global.postMessage(messagePrefix + handle, "*");
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return handle;
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};
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}
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function installMessageChannelImplementation() {
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var channel = new MessageChannel();
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channel.port1.onmessage = function(event) {
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var handle = event.data;
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runIfPresent(handle);
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};
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setImmediate = function() {
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var handle = addFromSetImmediateArguments(arguments);
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channel.port2.postMessage(handle);
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return handle;
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};
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}
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function installReadyStateChangeImplementation() {
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var html = doc.documentElement;
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setImmediate = function() {
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var handle = addFromSetImmediateArguments(arguments);
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// Create a <script> element; its readystatechange event will be fired asynchronously once it is inserted
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// into the document. Do so, thus queuing up the task. Remember to clean up once it's been called.
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var script = doc.createElement("script");
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script.onreadystatechange = function () {
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runIfPresent(handle);
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script.onreadystatechange = null;
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html.removeChild(script);
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script = null;
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};
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html.appendChild(script);
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return handle;
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};
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}
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function installSetTimeoutImplementation() {
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setImmediate = function() {
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var handle = addFromSetImmediateArguments(arguments);
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setTimeout(partiallyApplied(runIfPresent, handle), 0);
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return handle;
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};
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}
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// Don't get fooled by e.g. browserify environments.
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if ({}.toString.call(global.process) === "[object process]") {
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// For Node.js before 0.9
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installNextTickImplementation();
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} else if (canUsePostMessage()) {
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// For non-IE10 modern browsers
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installPostMessageImplementation();
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} else if (global.MessageChannel) {
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// For web workers, where supported
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installMessageChannelImplementation();
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} else if (doc && "onreadystatechange" in doc.createElement("script")) {
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// For IE 6–8
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installReadyStateChangeImplementation();
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} else {
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// For older browsers
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installSetTimeoutImplementation();
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}
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return setImmediate;
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}
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module.exports = install();
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})(this);
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Block a user