1/*
2 * (C) 1999 Lars Knoll (knoll@kde.org)
3 * (C) 2000 Dirk Mueller (mueller@kde.org)
4 * Copyright (C) 2004, 2005, 2006, 2007 Apple Inc. All rights reserved.
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Library General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14 * Library General Public License for more details.
15 *
16 * You should have received a copy of the GNU Library General Public License
17 * along with this library; see the file COPYING.LIB.  If not, write to
18 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
19 * Boston, MA 02110-1301, USA.
20 *
21 */
22
23#include "config.h"
24#include "core/rendering/RenderTextFragment.h"
25
26#include "core/dom/Text.h"
27#include "core/rendering/HitTestResult.h"
28#include "core/rendering/RenderBlock.h"
29
30namespace blink {
31
32RenderTextFragment::RenderTextFragment(Node* node, StringImpl* str, int startOffset, int length)
33    : RenderText(node, str ? str->substring(startOffset, length) : PassRefPtr<StringImpl>(nullptr))
34    , m_start(startOffset)
35    , m_end(length)
36    , m_firstLetter(nullptr)
37{
38}
39
40RenderTextFragment::RenderTextFragment(Node* node, StringImpl* str)
41    : RenderText(node, str)
42    , m_start(0)
43    , m_end(str ? str->length() : 0)
44    , m_contentString(str)
45    , m_firstLetter(nullptr)
46{
47}
48
49RenderTextFragment::~RenderTextFragment()
50{
51}
52
53void RenderTextFragment::trace(Visitor* visitor)
54{
55    visitor->trace(m_firstLetter);
56    RenderText::trace(visitor);
57}
58
59RenderText* RenderTextFragment::firstRenderTextInFirstLetter() const
60{
61    for (RenderObject* current = m_firstLetter; current; current = current->nextInPreOrder(m_firstLetter)) {
62        if (current->isText())
63            return toRenderText(current);
64    }
65    return 0;
66}
67
68PassRefPtr<StringImpl> RenderTextFragment::originalText() const
69{
70    Node* e = node();
71    RefPtr<StringImpl> result = ((e && e->isTextNode()) ? toText(e)->dataImpl() : contentString());
72    if (!result)
73        return nullptr;
74    return result->substring(start(), end());
75}
76
77void RenderTextFragment::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
78{
79    RenderText::styleDidChange(diff, oldStyle);
80
81    if (RenderBlock* block = blockForAccompanyingFirstLetter()) {
82        block->style()->removeCachedPseudoStyle(FIRST_LETTER);
83        block->updateFirstLetter();
84    }
85}
86
87void RenderTextFragment::willBeDestroyed()
88{
89    if (m_firstLetter)
90        m_firstLetter->destroy();
91    RenderText::willBeDestroyed();
92}
93
94void RenderTextFragment::setText(PassRefPtr<StringImpl> text, bool force)
95{
96    RenderText::setText(text, force);
97
98    m_start = 0;
99    m_end = textLength();
100    if (m_firstLetter) {
101        // FIXME: We should not modify the structure of the render tree during
102        // layout. crbug.com/370458
103        DeprecatedDisableModifyRenderTreeStructureAsserts disabler;
104
105        ASSERT(!m_contentString);
106        m_firstLetter->destroy();
107        m_firstLetter = nullptr;
108        if (Node* t = node()) {
109            ASSERT(!t->renderer());
110            t->setRenderer(this);
111        }
112    }
113}
114
115void RenderTextFragment::transformText()
116{
117    // Don't reset first-letter here because we are only transforming the truncated fragment.
118    if (RefPtr<StringImpl> textToTransform = originalText())
119        RenderText::setText(textToTransform.release(), true);
120}
121
122UChar RenderTextFragment::previousCharacter() const
123{
124    if (start()) {
125        Node* e = node();
126        StringImpl* original = ((e && e->isTextNode()) ? toText(e)->dataImpl() : contentString());
127        if (original && start() <= original->length())
128            return (*original)[start() - 1];
129    }
130
131    return RenderText::previousCharacter();
132}
133
134RenderBlock* RenderTextFragment::blockForAccompanyingFirstLetter() const
135{
136    if (!m_firstLetter)
137        return 0;
138    for (RenderObject* block = m_firstLetter->parent(); block; block = block->parent()) {
139        if (block->style()->hasPseudoStyle(FIRST_LETTER) && block->canHaveChildren() && block->isRenderBlock())
140            return toRenderBlock(block);
141    }
142    return 0;
143}
144
145void RenderTextFragment::updateHitTestResult(HitTestResult& result, const LayoutPoint& point)
146{
147    if (result.innerNode())
148        return;
149
150    RenderObject::updateHitTestResult(result, point);
151    if (m_firstLetter || !node())
152        return;
153    RenderObject* nodeRenderer = node()->renderer();
154    if (!nodeRenderer || !nodeRenderer->isText() || !toRenderText(nodeRenderer)->isTextFragment())
155        return;
156
157    if (isDescendantOf(toRenderTextFragment(nodeRenderer)->m_firstLetter))
158        result.setIsFirstLetter(true);
159}
160
161} // namespace blink
162