diff options
Diffstat (limited to 'catapult/third_party/polymer/components/webcomponentsjs/MutationObserver.js')
| -rw-r--r-- | catapult/third_party/polymer/components/webcomponentsjs/MutationObserver.js | 350 |
1 files changed, 350 insertions, 0 deletions
diff --git a/catapult/third_party/polymer/components/webcomponentsjs/MutationObserver.js b/catapult/third_party/polymer/components/webcomponentsjs/MutationObserver.js new file mode 100644 index 00000000..204de7d7 --- /dev/null +++ b/catapult/third_party/polymer/components/webcomponentsjs/MutationObserver.js @@ -0,0 +1,350 @@ +/** + * @license + * Copyright (c) 2014 The Polymer Project Authors. All rights reserved. + * This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt + * The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt + * The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt + * Code distributed by Google as part of the polymer project is also + * subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt + */ +// @version 0.7.24 +if (typeof WeakMap === "undefined") { + (function() { + var defineProperty = Object.defineProperty; + var counter = Date.now() % 1e9; + var WeakMap = function() { + this.name = "__st" + (Math.random() * 1e9 >>> 0) + (counter++ + "__"); + }; + WeakMap.prototype = { + set: function(key, value) { + var entry = key[this.name]; + if (entry && entry[0] === key) entry[1] = value; else defineProperty(key, this.name, { + value: [ key, value ], + writable: true + }); + return this; + }, + get: function(key) { + var entry; + return (entry = key[this.name]) && entry[0] === key ? entry[1] : undefined; + }, + "delete": function(key) { + var entry = key[this.name]; + if (!entry || entry[0] !== key) return false; + entry[0] = entry[1] = undefined; + return true; + }, + has: function(key) { + var entry = key[this.name]; + if (!entry) return false; + return entry[0] === key; + } + }; + window.WeakMap = WeakMap; + })(); +} + +(function(global) { + if (global.JsMutationObserver) { + return; + } + var registrationsTable = new WeakMap(); + var setImmediate; + if (/Trident|Edge/.test(navigator.userAgent)) { + setImmediate = setTimeout; + } else if (window.setImmediate) { + setImmediate = window.setImmediate; + } else { + var setImmediateQueue = []; + var sentinel = String(Math.random()); + window.addEventListener("message", function(e) { + if (e.data === sentinel) { + var queue = setImmediateQueue; + setImmediateQueue = []; + queue.forEach(function(func) { + func(); + }); + } + }); + setImmediate = function(func) { + setImmediateQueue.push(func); + window.postMessage(sentinel, "*"); + }; + } + var isScheduled = false; + var scheduledObservers = []; + function scheduleCallback(observer) { + scheduledObservers.push(observer); + if (!isScheduled) { + isScheduled = true; + setImmediate(dispatchCallbacks); + } + } + function wrapIfNeeded(node) { + return window.ShadowDOMPolyfill && window.ShadowDOMPolyfill.wrapIfNeeded(node) || node; + } + function dispatchCallbacks() { + isScheduled = false; + var observers = scheduledObservers; + scheduledObservers = []; + observers.sort(function(o1, o2) { + return o1.uid_ - o2.uid_; + }); + var anyNonEmpty = false; + observers.forEach(function(observer) { + var queue = observer.takeRecords(); + removeTransientObserversFor(observer); + if (queue.length) { + observer.callback_(queue, observer); + anyNonEmpty = true; + } + }); + if (anyNonEmpty) dispatchCallbacks(); + } + function removeTransientObserversFor(observer) { + observer.nodes_.forEach(function(node) { + var registrations = registrationsTable.get(node); + if (!registrations) return; + registrations.forEach(function(registration) { + if (registration.observer === observer) registration.removeTransientObservers(); + }); + }); + } + function forEachAncestorAndObserverEnqueueRecord(target, callback) { + for (var node = target; node; node = node.parentNode) { + var registrations = registrationsTable.get(node); + if (registrations) { + for (var j = 0; j < registrations.length; j++) { + var registration = registrations[j]; + var options = registration.options; + if (node !== target && !options.subtree) continue; + var record = callback(options); + if (record) registration.enqueue(record); + } + } + } + } + var uidCounter = 0; + function JsMutationObserver(callback) { + this.callback_ = callback; + this.nodes_ = []; + this.records_ = []; + this.uid_ = ++uidCounter; + } + JsMutationObserver.prototype = { + observe: function(target, options) { + target = wrapIfNeeded(target); + if (!options.childList && !options.attributes && !options.characterData || options.attributeOldValue && !options.attributes || options.attributeFilter && options.attributeFilter.length && !options.attributes || options.characterDataOldValue && !options.characterData) { + throw new SyntaxError(); + } + var registrations = registrationsTable.get(target); + if (!registrations) registrationsTable.set(target, registrations = []); + var registration; + for (var i = 0; i < registrations.length; i++) { + if (registrations[i].observer === this) { + registration = registrations[i]; + registration.removeListeners(); + registration.options = options; + break; + } + } + if (!registration) { + registration = new Registration(this, target, options); + registrations.push(registration); + this.nodes_.push(target); + } + registration.addListeners(); + }, + disconnect: function() { + this.nodes_.forEach(function(node) { + var registrations = registrationsTable.get(node); + for (var i = 0; i < registrations.length; i++) { + var registration = registrations[i]; + if (registration.observer === this) { + registration.removeListeners(); + registrations.splice(i, 1); + break; + } + } + }, this); + this.records_ = []; + }, + takeRecords: function() { + var copyOfRecords = this.records_; + this.records_ = []; + return copyOfRecords; + } + }; + function MutationRecord(type, target) { + this.type = type; + this.target = target; + this.addedNodes = []; + this.removedNodes = []; + this.previousSibling = null; + this.nextSibling = null; + this.attributeName = null; + this.attributeNamespace = null; + this.oldValue = null; + } + function copyMutationRecord(original) { + var record = new MutationRecord(original.type, original.target); + record.addedNodes = original.addedNodes.slice(); + record.removedNodes = original.removedNodes.slice(); + record.previousSibling = original.previousSibling; + record.nextSibling = original.nextSibling; + record.attributeName = original.attributeName; + record.attributeNamespace = original.attributeNamespace; + record.oldValue = original.oldValue; + return record; + } + var currentRecord, recordWithOldValue; + function getRecord(type, target) { + return currentRecord = new MutationRecord(type, target); + } + function getRecordWithOldValue(oldValue) { + if (recordWithOldValue) return recordWithOldValue; + recordWithOldValue = copyMutationRecord(currentRecord); + recordWithOldValue.oldValue = oldValue; + return recordWithOldValue; + } + function clearRecords() { + currentRecord = recordWithOldValue = undefined; + } + function recordRepresentsCurrentMutation(record) { + return record === recordWithOldValue || record === currentRecord; + } + function selectRecord(lastRecord, newRecord) { + if (lastRecord === newRecord) return lastRecord; + if (recordWithOldValue && recordRepresentsCurrentMutation(lastRecord)) return recordWithOldValue; + return null; + } + function Registration(observer, target, options) { + this.observer = observer; + this.target = target; + this.options = options; + this.transientObservedNodes = []; + } + Registration.prototype = { + enqueue: function(record) { + var records = this.observer.records_; + var length = records.length; + if (records.length > 0) { + var lastRecord = records[length - 1]; + var recordToReplaceLast = selectRecord(lastRecord, record); + if (recordToReplaceLast) { + records[length - 1] = recordToReplaceLast; + return; + } + } else { + scheduleCallback(this.observer); + } + records[length] = record; + }, + addListeners: function() { + this.addListeners_(this.target); + }, + addListeners_: function(node) { + var options = this.options; + if (options.attributes) node.addEventListener("DOMAttrModified", this, true); + if (options.characterData) node.addEventListener("DOMCharacterDataModified", this, true); + if (options.childList) node.addEventListener("DOMNodeInserted", this, true); + if (options.childList || options.subtree) node.addEventListener("DOMNodeRemoved", this, true); + }, + removeListeners: function() { + this.removeListeners_(this.target); + }, + removeListeners_: function(node) { + var options = this.options; + if (options.attributes) node.removeEventListener("DOMAttrModified", this, true); + if (options.characterData) node.removeEventListener("DOMCharacterDataModified", this, true); + if (options.childList) node.removeEventListener("DOMNodeInserted", this, true); + if (options.childList || options.subtree) node.removeEventListener("DOMNodeRemoved", this, true); + }, + addTransientObserver: function(node) { + if (node === this.target) return; + this.addListeners_(node); + this.transientObservedNodes.push(node); + var registrations = registrationsTable.get(node); + if (!registrations) registrationsTable.set(node, registrations = []); + registrations.push(this); + }, + removeTransientObservers: function() { + var transientObservedNodes = this.transientObservedNodes; + this.transientObservedNodes = []; + transientObservedNodes.forEach(function(node) { + this.removeListeners_(node); + var registrations = registrationsTable.get(node); + for (var i = 0; i < registrations.length; i++) { + if (registrations[i] === this) { + registrations.splice(i, 1); + break; + } + } + }, this); + }, + handleEvent: function(e) { + e.stopImmediatePropagation(); + switch (e.type) { + case "DOMAttrModified": + var name = e.attrName; + var namespace = e.relatedNode.namespaceURI; + var target = e.target; + var record = new getRecord("attributes", target); + record.attributeName = name; + record.attributeNamespace = namespace; + var oldValue = e.attrChange === MutationEvent.ADDITION ? null : e.prevValue; + forEachAncestorAndObserverEnqueueRecord(target, function(options) { + if (!options.attributes) return; + if (options.attributeFilter && options.attributeFilter.length && options.attributeFilter.indexOf(name) === -1 && options.attributeFilter.indexOf(namespace) === -1) { + return; + } + if (options.attributeOldValue) return getRecordWithOldValue(oldValue); + return record; + }); + break; + + case "DOMCharacterDataModified": + var target = e.target; + var record = getRecord("characterData", target); + var oldValue = e.prevValue; + forEachAncestorAndObserverEnqueueRecord(target, function(options) { + if (!options.characterData) return; + if (options.characterDataOldValue) return getRecordWithOldValue(oldValue); + return record; + }); + break; + + case "DOMNodeRemoved": + this.addTransientObserver(e.target); + + case "DOMNodeInserted": + var changedNode = e.target; + var addedNodes, removedNodes; + if (e.type === "DOMNodeInserted") { + addedNodes = [ changedNode ]; + removedNodes = []; + } else { + addedNodes = []; + removedNodes = [ changedNode ]; + } + var previousSibling = changedNode.previousSibling; + var nextSibling = changedNode.nextSibling; + var record = getRecord("childList", e.target.parentNode); + record.addedNodes = addedNodes; + record.removedNodes = removedNodes; + record.previousSibling = previousSibling; + record.nextSibling = nextSibling; + forEachAncestorAndObserverEnqueueRecord(e.relatedNode, function(options) { + if (!options.childList) return; + return record; + }); + } + clearRecords(); + } + }; + global.JsMutationObserver = JsMutationObserver; + if (!global.MutationObserver) { + global.MutationObserver = JsMutationObserver; + JsMutationObserver._isPolyfilled = true; + } +})(self);
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