text: /*
   * Copyright (C) 2005, 2008 Apple Inc. All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
   * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
   * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
   * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
   * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
   * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
   * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
   */
  
  #include "config.h"
  #include "SplitElementCommand.h"
  
  #include "Element.h"
  #include "HTMLNames.h"
  #include <wtf/Assertions.h>
  
  namespace WebCore {
  
  SplitElementCommand::SplitElementCommand(Ref<Element>&& element, Ref<Node>&& atChild)
      : SimpleEditCommand(element->document())
      , m_element2(WTFMove(element))
      , m_atChild(WTFMove(atChild))
  {
      ASSERT(m_atChild->parentNode() == m_element2.ptr());
  }
  
  void SplitElementCommand::executeApply()
  {
      if (m_atChild->parentNode() != m_element2.ptr())
          return;
      
      Vector<Ref<Node>> children;
      for (Node* node = m_element2->firstChild(); node != m_atChild.ptr(); node = node->nextSibling())
          children.append(*node);
  
      auto* parent = m_element2->parentNode();
      if (!parent || !parent->hasEditableStyle())
          return;
      if (parent->insertBefore(*m_element1, m_element2.ptr()).hasException())
          return;
  
      // Delete id attribute from the second element because the same id cannot be used for more than one element
      m_element2->removeAttribute(HTMLNames::idAttr);
  
      for (auto& child : children)
          m_element1->appendChild(child);
  }
      
  void SplitElementCommand::doApply()
  {
      m_element1 = m_element2->cloneElementWithoutChildren(document());
      
      executeApply();
  }
  
  void SplitElementCommand::doUnapply()
  {
      if (!m_element1 || !m_element1->hasEditableStyle() || !m_element2->hasEditableStyle())
          return;
  
      Vector<Ref<Node>> children;
      for (Node* node = m_element1->firstChild(); node; node = node->nextSibling())
          children.append(*node);
  
      RefPtr<Node> refChild = m_element2->firstChild();
  
      for (auto& child : children)
          m_element2->insertBefore(child, refChild.get());
  
      // Recover the id attribute of the original element.
      const AtomString& id = m_element1->getIdAttribute();
      if (!id.isNull())
          m_element2->setIdAttribute(id);
  
      m_element1->remove();
  }
  
  void SplitElementCommand::doReapply()
  {
      if (!m_element1)
          return;
      
      executeApply();
  }
  
  #ifndef NDEBUG
  void SplitElementCommand::getNodesInCommand(HashSet<Node*>& nodes)
  {
      addNodeAndDescendants(m_element1.get(), nodes);
      addNodeAndDescendants(m_element2.ptr(), nodes);
      addNodeAndDescendants(m_atChild.ptr(), nodes);
  }
  #endif
      
  } // namespace WebCore
  