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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 "SplitTextNodeCommand.h"
     28 
     29 #include "Document.h"
     30 #include "Text.h"
     31 #include <wtf/Assertions.h>
     32 
     33 namespace WebCore {
     34 
     35 SplitTextNodeCommand::SplitTextNodeCommand(PassRefPtr<Text> text, int offset)
     36     : SimpleEditCommand(text->document())
     37     , m_text2(text)
     38     , m_offset(offset)
     39 {
     40     // NOTE: Various callers rely on the fact that the original node becomes
     41     // the second node (i.e. the new node is inserted before the existing one).
     42     // That is not a fundamental dependency (i.e. it could be re-coded), but
     43     // rather is based on how this code happens to work.
     44     ASSERT(m_text2);
     45     ASSERT(m_text2->length() > 0);
     46     ASSERT(m_offset > 0);
     47     ASSERT(m_offset < m_text2->length());
     48 }
     49 
     50 void SplitTextNodeCommand::doApply()
     51 {
     52     Node* parent = m_text2->parentNode();
     53     if (!parent || !parent->isContentEditable())
     54         return;
     55 
     56     ExceptionCode ec = 0;
     57 
     58     String prefixText = m_text2->substringData(0, m_offset, ec);
     59     if (prefixText.isEmpty())
     60         return;
     61 
     62     RefPtr<Text> prefixTextNode = Text::create(document(), prefixText);
     63     ASSERT(prefixTextNode);
     64     document()->copyMarkers(m_text2.get(), 0, m_offset, prefixTextNode.get(), 0);
     65 
     66     parent->insertBefore(prefixTextNode.get(), m_text2.get(), ec);
     67     if (ec)
     68         return;
     69 
     70     m_text2->deleteData(0, m_offset, ec);
     71     m_text1 = prefixTextNode.release();
     72 }
     73 
     74 void SplitTextNodeCommand::doUnapply()
     75 {
     76     if (!m_text1 || !m_text1->isContentEditable())
     77         return;
     78 
     79     ASSERT(m_text1->document() == document());
     80 
     81     RefPtr<Text> prefixTextNode = m_text1.release();
     82     String prefixText = prefixTextNode->data();
     83 
     84     ExceptionCode ec = 0;
     85     m_text2->insertData(0, prefixText, ec);
     86     if (ec)
     87         return;
     88 
     89     document()->copyMarkers(prefixTextNode.get(), 0, prefixText.length(), m_text2.get(), 0);
     90     prefixTextNode->remove(ec);
     91 }
     92 
     93 } // namespace WebCore
     94