1 : /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
2 : /* vim: set ts=4 et sw=4 tw=80: */
3 : /* ***** BEGIN LICENSE BLOCK *****
4 : * Version: MPL 1.1/GPL 2.0/LGPL 2.1
5 : *
6 : * The contents of this file are subject to the Mozilla Public License Version
7 : * 1.1 (the "License"); you may not use this file except in compliance with
8 : * the License. You may obtain a copy of the License at
9 : * http://www.mozilla.org/MPL/
10 : *
11 : * Software distributed under the License is distributed on an "AS IS" basis,
12 : * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
13 : * for the specific language governing rights and limitations under the
14 : * License.
15 : *
16 : * The Original Code is this file as it was released on May 1 2001.
17 : *
18 : * The Initial Developer of the Original Code is
19 : * Jonas Sicking.
20 : * Portions created by the Initial Developer are Copyright (C) 2001
21 : * the Initial Developer. All Rights Reserved.
22 : *
23 : * Contributor(s):
24 : * Jonas Sicking <sicking@bigfoot.com> (Original Author)
25 : * Craig Topper <craig.topper@gmail.com>
26 : *
27 : * Alternatively, the contents of this file may be used under the terms of
28 : * either of the GNU General Public License Version 2 or later (the "GPL"),
29 : * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
30 : * in which case the provisions of the GPL or the LGPL are applicable instead
31 : * of those above. If you wish to allow use of your version of this file only
32 : * under the terms of either the GPL or the LGPL, and not to allow others to
33 : * use your version of this file under the terms of the MPL, indicate your
34 : * decision by deleting the provisions above and replace them with the notice
35 : * and other provisions required by the GPL or the LGPL. If you do not delete
36 : * the provisions above, a recipient may use your version of this file under
37 : * the terms of any one of the MPL, the GPL or the LGPL.
38 : *
39 : * ***** END LICENSE BLOCK ***** */
40 :
41 : /*
42 : * Implementation of DOM Traversal's nsIDOMTreeWalker
43 : */
44 :
45 : #ifndef nsTreeWalker_h___
46 : #define nsTreeWalker_h___
47 :
48 : #include "nsIDOMTreeWalker.h"
49 : #include "nsTraversal.h"
50 : #include "nsCOMPtr.h"
51 : #include "nsTArray.h"
52 : #include "nsCycleCollectionParticipant.h"
53 :
54 : class nsINode;
55 : class nsIDOMNode;
56 : class nsIDOMNodeFilter;
57 :
58 : class nsTreeWalker : public nsIDOMTreeWalker, public nsTraversal
59 : {
60 : public:
61 26 : NS_DECL_CYCLE_COLLECTING_ISUPPORTS
62 : NS_DECL_NSIDOMTREEWALKER
63 :
64 : nsTreeWalker(nsINode *aRoot,
65 : PRUint32 aWhatToShow,
66 : nsIDOMNodeFilter *aFilter);
67 : virtual ~nsTreeWalker();
68 :
69 2114 : NS_DECL_CYCLE_COLLECTION_CLASS(nsTreeWalker)
70 :
71 : private:
72 : nsCOMPtr<nsINode> mCurrentNode;
73 :
74 : /*
75 : * Implements FirstChild and LastChild which only vary in which direction
76 : * they search.
77 : * @param aReversed Controls whether we search forwards or backwards
78 : * @param _retval Returned node. Null if no child is found
79 : * @returns Errorcode
80 : */
81 : nsresult FirstChildInternal(bool aReversed, nsIDOMNode **_retval);
82 :
83 : /*
84 : * Implements NextSibling and PreviousSibling which only vary in which
85 : * direction they search.
86 : * @param aReversed Controls whether we search forwards or backwards
87 : * @param _retval Returned node. Null if no child is found
88 : * @returns Errorcode
89 : */
90 : nsresult NextSiblingInternal(bool aReversed, nsIDOMNode **_retval);
91 : };
92 :
93 : #endif
94 :
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