WebCore/editing/SplitElementCommand.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 "SplitElementCommand.h"
  28
  29 #include "Element.h"
  30 #include <wtf/Assertions.h>
  31
  32 namespace WebCore {
  33
  34 SplitElementCommand::SplitElementCommand(PassRefPtr<Element> element, PassRefPtr<Node> atChild)
  35     : SimpleEditCommand(element->document()), m_element2(element), m_atChild(atChild)
  36 {
  37     ASSERT(m_element2);
  38     ASSERT(m_atChild);
  39 }
  40
  41 void SplitElementCommand::doApply()
  42 {
  43     ASSERT(m_element2);
  44     ASSERT(m_atChild);
  45     ASSERT(m_atChild->parentNode() == m_element2);
  46
  47     ExceptionCode ec = 0;
  48
  49     if (!m_element1) {
  50         // create only if needed.
  51         // if reapplying, this object will already exist.
  52         m_element1 = static_pointer_cast<Element>(m_element2->cloneNode(false));
  53         ASSERT(m_element1);
  54     }
  55
  56     m_element2->parent()->insertBefore(m_element1.get(), m_element2.get(), ec);
  57     ASSERT(ec == 0);
  58
  59     // Bail if we were asked to split at a bogus child, to avoid hanging below.
  60     if (!m_atChild || m_atChild->parentNode() != m_element2)
  61         return;
  62
  63     while (m_element2->firstChild() != m_atChild) {
  64         ASSERT(m_element2->firstChild());
  65         m_element1->appendChild(m_element2->firstChild(), ec);
  66         ASSERT(ec == 0);
  67     }
  68 }
  69
  70 void SplitElementCommand::doUnapply()
  71 {
  72     ASSERT(m_element1);
  73     ASSERT(m_element2);
  74     ASSERT(m_atChild);
  75
  76     ASSERT(m_element1->nextSibling() == m_element2);
  77     ASSERT(m_element2->firstChild() && m_element2->firstChild() == m_atChild);
  78
  79     ExceptionCode ec = 0;
  80
  81     while (m_element1->lastChild()) {
  82         m_element2->insertBefore(m_element1->lastChild(), m_element2->firstChild(), ec);
  83         ASSERT(ec == 0);
  84     }
  85
  86     m_element2->parentNode()->removeChild(m_element1.get(), ec);
  87     ASSERT(ec == 0);
  88 }
  89
  90 } // namespace WebCore