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bower_components/webcomponentsjs/MutationObserver.js 12.4 KB
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  /**
   * @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
   */
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  // @version 0.7.15
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  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) {
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    if (global.JsMutationObserver) {
      return;
    }
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    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;
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    if (!global.MutationObserver) {
      global.MutationObserver = JsMutationObserver;
      JsMutationObserver._isPolyfilled = true;
    }
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  })(self);