1 | /* |
2 | * Copyright (C) 1999 Lars Knoll (knoll@kde.org) |
3 | * Copyright (C) 2000 Frederik Holljen (frederik.holljen@hig.no) |
4 | * Copyright (C) 2001 Peter Kelly (pmk@post.com) |
5 | * Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com) |
6 | * Copyright (C) 2004-2019 Apple Inc. All rights reserved. |
7 | * |
8 | * This library is free software; you can redistribute it and/or |
9 | * modify it under the terms of the GNU Library General Public |
10 | * License as published by the Free Software Foundation; either |
11 | * version 2 of the License, or (at your option) any later version. |
12 | * |
13 | * This library is distributed in the hope that it will be useful, |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
16 | * Library General Public License for more details. |
17 | * |
18 | * You should have received a copy of the GNU Library General Public License |
19 | * along with this library; see the file COPYING.LIB. If not, write to |
20 | * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
21 | * Boston, MA 02110-1301, USA. |
22 | * |
23 | */ |
24 | |
25 | #pragma once |
26 | |
27 | #include "ExceptionOr.h" |
28 | #include "NodeFilter.h" |
29 | #include "ScriptWrappable.h" |
30 | #include "Traversal.h" |
31 | #include <wtf/IsoMalloc.h> |
32 | |
33 | namespace WebCore { |
34 | |
35 | class NodeIterator final : public ScriptWrappable, public RefCounted<NodeIterator>, public NodeIteratorBase { |
36 | WTF_MAKE_ISO_ALLOCATED_EXPORT(NodeIterator, WEBCORE_EXPORT); |
37 | public: |
38 | static Ref<NodeIterator> create(Node&, unsigned whatToShow, RefPtr<NodeFilter>&&); |
39 | WEBCORE_EXPORT ~NodeIterator(); |
40 | |
41 | WEBCORE_EXPORT ExceptionOr<RefPtr<Node>> nextNode(); |
42 | WEBCORE_EXPORT ExceptionOr<RefPtr<Node>> previousNode(); |
43 | void detach() { } // This is now a no-op as per the DOM specification. |
44 | |
45 | Node* referenceNode() const { return m_referenceNode.node.get(); } |
46 | bool pointerBeforeReferenceNode() const { return m_referenceNode.isPointerBeforeNode; } |
47 | |
48 | // This function is called before any node is removed from the document tree. |
49 | void nodeWillBeRemoved(Node&); |
50 | |
51 | private: |
52 | NodeIterator(Node&, unsigned whatToShow, RefPtr<NodeFilter>&&); |
53 | |
54 | struct NodePointer { |
55 | RefPtr<Node> node; |
56 | bool isPointerBeforeNode { true }; |
57 | |
58 | NodePointer() = default; |
59 | NodePointer(Node&, bool); |
60 | |
61 | void clear(); |
62 | bool moveToNext(Node& root); |
63 | bool moveToPrevious(Node& root); |
64 | }; |
65 | |
66 | void updateForNodeRemoval(Node& nodeToBeRemoved, NodePointer&) const; |
67 | |
68 | NodePointer m_referenceNode; |
69 | NodePointer m_candidateNode; |
70 | }; |
71 | |
72 | } // namespace WebCore |
73 | |