third_party/WebKit/Source/core/editing/SplitTextNodeCommand.cpp

   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/core/v8/ExceptionState.h"
  30 #include "bindings/core/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
  36 namespace blink {
  37
  38 SplitTextNodeCommand::SplitTextNodeCommand(PassRefPtrWillBeRawPtr<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
  53 void SplitTextNodeCommand::doApply()
  54 {
  55     ContainerNode* parent = m_text2->parentNode();
  56     if (!parent || !parent->hasEditableStyle())
  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
  70 void SplitTextNodeCommand::doUnapply()
  71 {
  72     if (!m_text1 || !m_text1->hasEditableStyle())
  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, CharacterData::DeprecatedRecalcStyleImmediatlelyForEditing);
  80
  81     document().markers().copyMarkers(m_text1.get(), 0, prefixText.length(), m_text2.get(), 0);
  82     m_text1->remove(ASSERT_NO_EXCEPTION);
  83 }
  84
  85 void SplitTextNodeCommand::doReapply()
  86 {
  87     if (!m_text1 || !m_text2)
  88         return;
  89
  90     ContainerNode* parent = m_text2->parentNode();
  91     if (!parent || !parent->hasEditableStyle())
  92         return;
  93
  94     insertText1AndTrimText2();
  95 }
  96
  97 void SplitTextNodeCommand::insertText1AndTrimText2()
  98 {
  99     TrackExceptionState exceptionState;
 100     m_text2->parentNode()->insertBefore(m_text1.get(), m_text2.get(), exceptionState);
 101     if (exceptionState.hadException())
 102         return;
 103     m_text2->deleteData(0, m_offset, exceptionState, CharacterData::DeprecatedRecalcStyleImmediatlelyForEditing);
 104 }
 105
 106 DEFINE_TRACE(SplitTextNodeCommand)
 107 {
 108     visitor->trace(m_text1);
 109     visitor->trace(m_text2);
 110     SimpleEditCommand::trace(visitor);
 111 }
 112
 113 } // namespace blink