1/*
2 * Copyright (C) 2005, 2008 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 COMPUTER, INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "config.h"
27#include "core/editing/SplitTextNodeCommand.h"
28
29#include "bindings/v8/ExceptionState.h"
30#include "bindings/v8/ExceptionStatePlaceholder.h"
31#include "core/dom/Document.h"
32#include "core/dom/DocumentMarkerController.h"
33#include "core/dom/Text.h"
34#include "wtf/Assertions.h"
35
36namespace WebCore {
37
38SplitTextNodeCommand::SplitTextNodeCommand(PassRefPtr<Text> text, int offset)
39    : SimpleEditCommand(text->document())
40    , m_text2(text)
41    , m_offset(offset)
42{
43    // NOTE: Various callers rely on the fact that the original node becomes
44    // the second node (i.e. the new node is inserted before the existing one).
45    // That is not a fundamental dependency (i.e. it could be re-coded), but
46    // rather is based on how this code happens to work.
47    ASSERT(m_text2);
48    ASSERT(m_text2->length() > 0);
49    ASSERT(m_offset > 0);
50    ASSERT(m_offset < m_text2->length());
51}
52
53void SplitTextNodeCommand::doApply()
54{
55    ContainerNode* parent = m_text2->parentNode();
56    if (!parent || !parent->rendererIsEditable())
57        return;
58
59    String prefixText = m_text2->substringData(0, m_offset, IGNORE_EXCEPTION);
60    if (prefixText.isEmpty())
61        return;
62
63    m_text1 = Text::create(document(), prefixText);
64    ASSERT(m_text1);
65    document()->markers()->copyMarkers(m_text2.get(), 0, m_offset, m_text1.get(), 0);
66
67    insertText1AndTrimText2();
68}
69
70void SplitTextNodeCommand::doUnapply()
71{
72    if (!m_text1 || !m_text1->rendererIsEditable())
73        return;
74
75    ASSERT(m_text1->document() == document());
76
77    String prefixText = m_text1->data();
78
79    m_text2->insertData(0, prefixText, ASSERT_NO_EXCEPTION);
80
81    document()->markers()->copyMarkers(m_text1.get(), 0, prefixText.length(), m_text2.get(), 0);
82    m_text1->remove(ASSERT_NO_EXCEPTION);
83}
84
85void SplitTextNodeCommand::doReapply()
86{
87    if (!m_text1 || !m_text2)
88        return;
89
90    ContainerNode* parent = m_text2->parentNode();
91    if (!parent || !parent->rendererIsEditable())
92        return;
93
94    insertText1AndTrimText2();
95}
96
97void SplitTextNodeCommand::insertText1AndTrimText2()
98{
99    TrackExceptionState es;
100    m_text2->parentNode()->insertBefore(m_text1.get(), m_text2.get(), es);
101    if (es.hadException())
102        return;
103    m_text2->deleteData(0, m_offset, es);
104}
105
106#ifndef NDEBUG
107void SplitTextNodeCommand::getNodesInCommand(HashSet<Node*>& nodes)
108{
109    addNodeAndDescendants(m_text1.get(), nodes);
110    addNodeAndDescendants(m_text2.get(), nodes);
111}
112#endif
113
114} // namespace WebCore
115