/*

 * Copyright (C) 1999 Lars Knoll (knoll@kde.org)

 *           (C) 1999 Antti Koivisto (koivisto@kde.org)

 * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.

 *

 * This library is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Library General Public

 * License as published by the Free Software Foundation; either

 * version 2 of the License, or (at your option) any later version.

 *

 * This library is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * Library General Public License for more details.

 *

 * You should have received a copy of the GNU Library General Public License

 * along with this library; see the file COPYING.LIB.  If not, write to

 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,

 * Boston, MA 02110-1301, USA.

 */

#include "config.h"

#include "CharacterData.h"

#include "EventNames.h"

#include "ExceptionCode.h"

#include "MutationEvent.h"

#include "RenderText.h"

namespace WebCore {

void CharacterData::setData(const String& data, ExceptionCode&)

{

    StringImpl* dataImpl = data.impl() ? data.impl() : StringImpl::empty();

    if (equal(m_data.get(), dataImpl))

        return;

    int oldLength = length();

    RefPtr<StringImpl> oldStr = m_data;

    m_data = dataImpl;

    if ((!renderer() || !rendererIsNeeded(renderer()->style())) && attached()) {

        detach();

        attach();

    } else if (renderer())

        toRenderText(renderer())->setTextWithOffset(m_data, 0, oldLength);

    dispatchModifiedEvent(oldStr.get());

    document()->textRemoved(this, 0, oldLength);

}

String CharacterData::substringData(unsigned offset, unsigned count, ExceptionCode& ec)

{

    checkCharDataOperation(offset, ec);

    if (ec)

        return String();

    return m_data->substring(offset, count);

}

PassRefPtr<StringImpl> CharacterData::appendDataCommon(const String& data)

{

    String newStr = m_data;

    newStr.append(data);

    RefPtr<StringImpl> oldStr = m_data;

    m_data = newStr.impl();

    if ((!renderer() || !rendererIsNeeded(renderer()->style())) && attached()) {

        detach();

        attach();

    } else if (renderer())

        toRenderText(renderer())->setTextWithOffset(m_data, oldStr->length(), 0);

    return oldStr.release();

}

void CharacterData::parserAppendData(const String& data)

{

    appendDataCommon(data);

    // We don't call dispatchModifiedEvent here because we don't want the

    // parser to dispatch DOM mutation events.

    if (parentNode())

        parentNode()->childrenChanged();

}

void CharacterData::appendData(const String& data, ExceptionCode&)

{

    RefPtr<StringImpl> oldStr = appendDataCommon(data);

    dispatchModifiedEvent(oldStr.get());

}

void CharacterData::insertData(unsigned offset, const String& data, ExceptionCode& ec)

{

    checkCharDataOperation(offset, ec);

    if (ec)

        return;

    String newStr = m_data;

    newStr.insert(data, offset);

    RefPtr<StringImpl> oldStr = m_data;

    m_data = newStr.impl();

    if ((!renderer() || !rendererIsNeeded(renderer()->style())) && attached()) {

        detach();

        attach();

    } else if (renderer())

        toRenderText(renderer())->setTextWithOffset(m_data, offset, 0);

    dispatchModifiedEvent(oldStr.get());

    document()->textInserted(this, offset, data.length());

}

void CharacterData::deleteData(unsigned offset, unsigned count, ExceptionCode& ec)

{

    checkCharDataOperation(offset, ec);

    if (ec)

        return;

    unsigned realCount;

    if (offset + count > length())

        realCount = length() - offset;

    else

        realCount = count;

    String newStr = m_data;

    newStr.remove(offset, realCount);

    RefPtr<StringImpl> oldStr = m_data;

    m_data = newStr.impl();

    if ((!renderer() || !rendererIsNeeded(renderer()->style())) && attached()) {

        detach();

        attach();

    } else if (renderer())

        toRenderText(renderer())->setTextWithOffset(m_data, offset, count);

    dispatchModifiedEvent(oldStr.get());

    document()->textRemoved(this, offset, realCount);

}

void CharacterData::replaceData(unsigned offset, unsigned count, const String& data, ExceptionCode& ec)

{

    checkCharDataOperation(offset, ec);

    if (ec)

        return;

    unsigned realCount;

    if (offset + count > length())

        realCount = length() - offset;

    else

        realCount = count;

    String newStr = m_data;

    newStr.remove(offset, realCount);

    newStr.insert(data, offset);

    RefPtr<StringImpl> oldStr = m_data;

    m_data = newStr.impl();

    if ((!renderer() || !rendererIsNeeded(renderer()->style())) && attached()) {

        detach();

        attach();

    } else if (renderer())

        toRenderText(renderer())->setTextWithOffset(m_data, offset, count);

    dispatchModifiedEvent(oldStr.get());

    // update the markers for spell checking and grammar checking

    document()->textRemoved(this, offset, realCount);

    document()->textInserted(this, offset, data.length());

}

String CharacterData::nodeValue() const

{

    return m_data;

}

bool CharacterData::containsOnlyWhitespace() const

{

    return !m_data || m_data->containsOnlyWhitespace();

}

void CharacterData::setNodeValue(const String& nodeValue, ExceptionCode& ec)

{

    setData(nodeValue, ec);

}

void CharacterData::dispatchModifiedEvent(StringImpl* prevValue)

{

    if (parentNode())

        parentNode()->childrenChanged();

    if (document()->hasListenerType(Document::DOMCHARACTERDATAMODIFIED_LISTENER))

        dispatchEvent(MutationEvent::create(eventNames().DOMCharacterDataModifiedEvent, true, 0, prevValue, m_data));

    dispatchSubtreeModifiedEvent();

}

void CharacterData::checkCharDataOperation(unsigned offset, ExceptionCode& ec)

{

    ec = 0;

    // INDEX_SIZE_ERR: Raised if the specified offset is negative or greater than the number of 16-bit

    // units in data.

    if (offset > length()) {

        ec = INDEX_SIZE_ERR;

        return;

    }

}

int CharacterData::maxCharacterOffset() const

{

    return static_cast<int>(length());

}

bool CharacterData::rendererIsNeeded(RenderStyle *style)

{

    if (!m_data || !length())

        return false;

    return Node::rendererIsNeeded(style);

}

bool CharacterData::offsetInCharacters() const

{

    return true;

}

} // namespace WebCore