1/*
2 * Copyright (C) 2015 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23 * THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#pragma once
27
28#include "RenderElement.h"
29#include "RenderFragmentedFlow.h"
30#include "RenderText.h"
31#include "RenderView.h"
32
33namespace WebCore {
34
35class RenderTreePosition {
36public:
37 explicit RenderTreePosition(RenderElement& parent)
38 : m_parent(parent)
39 {
40 }
41 RenderTreePosition(RenderElement& parent, RenderObject* nextSibling)
42 : m_parent(parent)
43 , m_nextSibling(makeWeakPtr(nextSibling))
44 , m_hasValidNextSibling(true)
45 {
46 }
47
48 RenderElement& parent() const { return m_parent; }
49 RenderObject* nextSibling() const { ASSERT(m_hasValidNextSibling); return m_nextSibling.get(); }
50
51 void computeNextSibling(const Node&);
52 void moveToLastChild();
53 void invalidateNextSibling() { m_hasValidNextSibling = false; }
54 void invalidateNextSibling(const RenderObject&);
55
56 RenderObject* nextSiblingRenderer(const Node&) const;
57
58private:
59 RenderElement& m_parent;
60 WeakPtr<RenderObject> m_nextSibling { nullptr };
61 bool m_hasValidNextSibling { false };
62#if !ASSERT_DISABLED
63 unsigned m_assertionLimitCounter { 0 };
64#endif
65};
66
67inline void RenderTreePosition::moveToLastChild()
68{
69 m_nextSibling = nullptr;
70 m_hasValidNextSibling = true;
71}
72
73} // namespace WebCore
74