goog.dom.TextRangeIterator = function()

in asdoc/library/closure/goog/dom/textrangeiterator.js [49:131]

• 50 lines of code
• 12 McCabe index (conditional complexity)

goog.dom.TextRangeIterator = function(
    startNode, startOffset, endNode, endOffset, opt_reverse) {
  /**
   * The first node in the selection.
   * @private {Node}
   */
  this.startNode_ = null;

  /**
   * The last node in the selection.
   * @private {Node}
   */
  this.endNode_ = null;

  /**
   * The offset within the first node in the selection.
   * @private {number}
   */
  this.startOffset_ = 0;

  /**
   * The offset within the last node in the selection.
   * @private {number}
   */
  this.endOffset_ = 0;

  /**
   * Whether the node iterator is moving in reverse.
   * @private {boolean}
   */
  this.isReversed_ = !!opt_reverse;

  var goNext;

  if (startNode) {
    this.startNode_ = startNode;
    this.startOffset_ = startOffset;
    this.endNode_ = endNode;
    this.endOffset_ = endOffset;

    // Skip to the offset nodes - being careful to special case BRs since these
    // have no children but still can appear as the startContainer of a range.
    if (startNode.nodeType == goog.dom.NodeType.ELEMENT &&
        /** @type {!Element} */ (startNode).tagName != goog.dom.TagName.BR) {
      var startChildren = startNode.childNodes;
      var candidate = startChildren[startOffset];
      if (candidate) {
        this.startNode_ = candidate;
        this.startOffset_ = 0;
      } else {
        if (startChildren.length) {
          this.startNode_ =
              /** @type {Node} */ (goog.array.peek(startChildren));
        }
        goNext = true;
      }
    }

    if (endNode.nodeType == goog.dom.NodeType.ELEMENT) {
      this.endNode_ = endNode.childNodes[endOffset];
      if (this.endNode_) {
        this.endOffset_ = 0;
      } else {
        // The offset was past the last element.
        this.endNode_ = endNode;
      }
    }
  }

  goog.dom.TextRangeIterator.base(
      this, 'constructor', this.isReversed_ ? this.endNode_ : this.startNode_,
      this.isReversed_);

  if (goNext) {
    try {
      this.next();
    } catch (e) {
      if (e != goog.iter.StopIteration) {
        throw e;
      }
    }
  }
};