/*

 * 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 COMPUTER, 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 COMPUTER, 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 "SplitTextNodeCommand.h"

#include "Document.h"

#include "Text.h"

#include <wtf/Assertions.h>

namespace WebCore {

SplitTextNodeCommand::SplitTextNodeCommand(PassRefPtr<Text> text, int offset)

    : SimpleEditCommand(text->document())

    , m_text2(text)

    , m_offset(offset)

{

    // NOTE: Various callers rely on the fact that the original node becomes

    // the second node (i.e. the new node is inserted before the existing one).

    // That is not a fundamental dependency (i.e. it could be re-coded), but

    // rather is based on how this code happens to work.

    ASSERT(m_text2);

    ASSERT(m_text2->length() > 0);

    ASSERT(m_offset > 0);

    ASSERT(m_offset < m_text2->length());

}

void SplitTextNodeCommand::doApply()

{

    Node* parent = m_text2->parentNode();

    if (!parent || !parent->isContentEditable())

        return;

    ExceptionCode ec = 0;

    String prefixText = m_text2->substringData(0, m_offset, ec);

    if (prefixText.isEmpty())

        return;

    RefPtr<Text> prefixTextNode = Text::create(document(), prefixText);

    ASSERT(prefixTextNode);

    document()->copyMarkers(m_text2.get(), 0, m_offset, prefixTextNode.get(), 0);

    parent->insertBefore(prefixTextNode.get(), m_text2.get(), ec);

    if (ec)

        return;

    m_text2->deleteData(0, m_offset, ec);

    m_text1 = prefixTextNode.release();

}

void SplitTextNodeCommand::doUnapply()

{

    if (!m_text1 || !m_text1->isContentEditable())

        return;

    ASSERT(m_text1->document() == document());

    RefPtr<Text> prefixTextNode = m_text1.release();

    String prefixText = prefixTextNode->data();

    ExceptionCode ec = 0;

    m_text2->insertData(0, prefixText, ec);

    if (ec)

        return;

    document()->copyMarkers(prefixTextNode.get(), 0, prefixText.length(), m_text2.get(), 0);

    prefixTextNode->remove(ec);

}

} // namespace WebCore