text: // Copyright 2007 The Closure Library Authors. All Rights Reserved.
  //
  // Licensed under the Apache License, Version 2.0 (the "License");
  // you may not use this file except in compliance with the License.
  // You may obtain a copy of the License at
  //
  //      http://www.apache.org/licenses/LICENSE-2.0
  //
  // Unless required by applicable law or agreed to in writing, software
  // distributed under the License is distributed on an "AS-IS" BASIS,
  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  // See the License for the specific language governing permissions and
  // limitations under the License.
  
  /**
   * @fileoverview Definition of the Gecko specific range wrapper.  Inherits most
   * functionality from W3CRange, but adds exceptions as necessary.
   *
   * DO NOT USE THIS FILE DIRECTLY.  Use goog.dom.Range instead.
   *
   * @author robbyw@google.com (Robby Walker)
   */
  
  
  goog.provide('goog.dom.browserrange.GeckoRange');
  
  goog.require('goog.dom.browserrange.W3cRange');
  
  
  
  /**
   * The constructor for Gecko specific browser ranges.
   * @param {Range} range The range object.
   * @constructor
   * @extends {goog.dom.browserrange.W3cRange}
   * @final
   */
  goog.dom.browserrange.GeckoRange = function(range) {
    goog.dom.browserrange.W3cRange.call(this, range);
  };
  goog.inherits(goog.dom.browserrange.GeckoRange, goog.dom.browserrange.W3cRange);
  
  
  /**
   * Creates a range object that selects the given node's text.
   * @param {Node} node The node to select.
   * @return {goog.dom.browserrange.GeckoRange} A Gecko range wrapper object.
   */
  goog.dom.browserrange.GeckoRange.createFromNodeContents = function(node) {
    return new goog.dom.browserrange.GeckoRange(
        goog.dom.browserrange.W3cRange.getBrowserRangeForNode(node));
  };
  
  
  /**
   * Creates a range object that selects between the given nodes.
   * @param {Node} startNode The node to start with.
   * @param {number} startOffset The offset within the node to start.
   * @param {Node} endNode The node to end with.
   * @param {number} endOffset The offset within the node to end.
   * @return {goog.dom.browserrange.GeckoRange} A wrapper object.
   */
  goog.dom.browserrange.GeckoRange.createFromNodes = function(startNode,
      startOffset, endNode, endOffset) {
    return new goog.dom.browserrange.GeckoRange(
        goog.dom.browserrange.W3cRange.getBrowserRangeForNodes(startNode,
            startOffset, endNode, endOffset));
  };
  
  
  /** @override */
  goog.dom.browserrange.GeckoRange.prototype.selectInternal = function(
      selection, reversed) {
    if (!reversed || this.isCollapsed()) {
      // The base implementation for select() is more robust, and works fine for
      // collapsed and forward ranges.  This works around
      // https://bugzilla.mozilla.org/show_bug.cgi?id=773137, and is tested by
      // range_test.html's testFocusedElementDisappears.
      goog.base(this, 'selectInternal', selection, reversed);
    } else {
      // Reversed selection -- start with a caret on the end node, and extend it
      // back to the start.  Unfortunately, collapse() fails when focus is
      // invalid.
      selection.collapse(this.getEndNode(), this.getEndOffset());
      selection.extend(this.getStartNode(), this.getStartOffset());
    }
  };
  