com.vaadin.polymer.public.bower_components.webcomponentsjs.MutationObserver.js Maven / Gradle / Ivy
The newest version!
/**
* @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);© 2015 - 2024 Weber Informatics LLC | Privacy Policy