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      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 
     36 namespace WebCore {
     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->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 
     70 void 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, 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->rendererIsEditable())
     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 void SplitTextNodeCommand::trace(Visitor* visitor)
    107 {
    108     visitor->trace(m_text1);
    109     visitor->trace(m_text2);
    110     SimpleEditCommand::trace(visitor);
    111 }
    112 
    113 } // namespace WebCore
    114