SplitTextNodeCommand.cpp   [plain text]

/*
 * Copyright (C) 2005 Apple Computer, 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
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 * 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(Text* text, int offset)
    : EditCommand(text->document()), m_text2(text), m_offset(offset)
{
    ASSERT(m_text2);
    ASSERT(m_text2->length() > 0);
}

void SplitTextNodeCommand::doApply()
{
    ASSERT(m_text2);
    ASSERT(m_offset > 0);

    ExceptionCode ec = 0;

    // 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.
    if (!m_text1) {
        // create only if needed.
        // if reapplying, this object will already exist.
        m_text1 = document()->createTextNode(m_text2->substringData(0, m_offset, ec));
        ASSERT(ec == 0);
        ASSERT(m_text1);
    }

    document()->copyMarkers(m_text2.get(), 0, m_offset, m_text1.get(), 0);
    m_text2->deleteData(0, m_offset, ec);
    ASSERT(ec == 0);

    m_text2->parentNode()->insertBefore(m_text1.get(), m_text2.get(), ec);
    ASSERT(ec == 0);
        
    ASSERT(m_text2->previousSibling()->isTextNode());
    ASSERT(m_text2->previousSibling() == m_text1);
}

void SplitTextNodeCommand::doUnapply()
{
    ASSERT(m_text1);
    ASSERT(m_text2);
    ASSERT(m_text1->nextSibling() == m_text2);
        
    ExceptionCode ec = 0;
    m_text2->insertData(0, m_text1->data(), ec);
    ASSERT(ec == 0);

    document()->copyMarkers(m_text1.get(), 0, m_offset, m_text2.get(), 0);

    m_text2->parentNode()->removeChild(m_text1.get(), ec);
    ASSERT(ec == 0);

    m_offset = m_text1->length();
}

} // namespace WebCore