/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "nsISupports.idl"

webidl Node;

// Note: the iterator does not handle DOM mutations gracefully. So if
// the underlying DOM we are iterating over is changed, the behavior
// of the walker is undefined. (With the current implementation we
// cache the siblings of the current node and this list is not updated
// when a mutation occurs).

[scriptable, uuid(6657e8eb-b646-48e7-993e-cfa6e96415b4)]
interface inIDeepTreeWalker : nsISupports
{
  attribute boolean showAnonymousContent;
  attribute boolean showSubDocuments;

  // By default the walker skips document nodes from the iteration,
  // by setting this flag to true this behavior can be altered.
  attribute boolean showDocumentsAsNodes;

  void init(in Node aRoot, in unsigned long aWhatToShow);

  // Methods and attributes that look like TreeWalker.
  // Note: normally parentNode cannot go further up on the tree once it reached
  // the root, but setting currentNode does not have this limitation. If currentNode
  // is set to a node that does not have the root as its ancestor the walk can be
  // continued from there, and once we reach a node that is 'under' the root, the
  // limitation for the parentNode will work again.
  readonly attribute Node             root;
  readonly attribute unsigned long    whatToShow;
           attribute Node             currentNode;

  Node         parentNode();
  Node         firstChild();
  Node         lastChild();
  Node         previousSibling();
  Node         nextSibling();
  Node         previousNode();
  Node         nextNode();
};