/*

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

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

 * Copyright (C) 2003, 2004, 2005, 2006, 2007 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 "Document.h"

#include "EventNames.h"

#include "ExceptionCode.h"

#include "TextStream.h"

#include "MutationEvent.h"

#include "RenderText.h"

namespace WebCore {

using namespace EventNames;

CharacterData::CharacterData(Document *doc)

    : EventTargetNode(doc)

{

    str = 0;

}

CharacterData::CharacterData(Document *doc, const String &_text)

    : EventTargetNode(doc)

{

    str = _text.impl() ? _text.impl() : new StringImpl(static_cast<UChar*>(0), 0);

    str->ref();

}

CharacterData::~CharacterData()

{

    if(str) str->deref();

}

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

{

    // NO_MODIFICATION_ALLOWED_ERR: Raised when the node is readonly

    if (isReadOnlyNode()) {

        ec = NO_MODIFICATION_ALLOWED_ERR;

        return;

    }

    if (equal(str, data.impl()))

        return;

    StringImpl* oldStr = str;

    str = data.impl();

    if (str)

        str->ref();

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

        detach();

        attach();

    } else if (renderer())

        static_cast<RenderText*>(renderer())->setText(str);

    dispatchModifiedEvent(oldStr);

    if (oldStr)

        oldStr->deref();

    document()->removeMarkers(this);

}

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

{

    ec = 0;

    checkCharDataOperation(offset, ec);

    if (ec)

        return String();

    return str->substring(offset,count);

}

void CharacterData::appendData( const String &arg, ExceptionCode& ec)

{

    ec = 0;

    // NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly

    if (isReadOnlyNode()) {

        ec = NO_MODIFICATION_ALLOWED_ERR;

        return;

    }

    StringImpl *oldStr = str;

    str = str->copy();

    str->ref();

    str->append(arg.impl());

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

        detach();

        attach();

    } else if (renderer())

        static_cast<RenderText*>(renderer())->setTextWithOffset(str, oldStr->length(), 0);

    dispatchModifiedEvent(oldStr);

    oldStr->deref();

}

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

{

    ec = 0;

    checkCharDataOperation(offset, ec);

    if (ec)

        return;

    StringImpl *oldStr = str;

    str = str->copy();

    str->ref();

    str->insert(arg.impl(), offset);

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

        detach();

        attach();

    } else if (renderer())

        static_cast<RenderText*>(renderer())->setTextWithOffset(str, offset, 0);

    dispatchModifiedEvent(oldStr);

    oldStr->deref();

    // update the markers for spell checking and grammar checking

    unsigned length = arg.length();

    document()->shiftMarkers(this, offset, length);

}

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

{

    ec = 0;

    checkCharDataOperation(offset, ec);

    if (ec)

        return;

    StringImpl *oldStr = str;

    str = str->copy();

    str->ref();

    str->remove(offset,count);

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

        detach();

        attach();

    dispatchModifiedEvent(oldStr);

    oldStr->deref();

    // update the markers for spell checking and grammar checking

    document()->removeMarkers(this, offset, count);

    document()->shiftMarkers(this, offset + count, -static_cast<int>(count));

}

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

{

    ec = 0;

    checkCharDataOperation(offset, ec);

    if (ec)

        return;

    unsigned realCount;

    if (offset + count > str->length())

        realCount = str->length()-offset;

    else

        realCount = count;

    StringImpl *oldStr = str;

    str = str->copy();

    str->ref();

    str->remove(offset,realCount);

    str->insert(arg.impl(), offset);

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

        detach();

        attach();

    } else if (renderer())

        static_cast<RenderText*>(renderer())->setTextWithOffset(str, offset, count);

    dispatchModifiedEvent(oldStr);

    oldStr->deref();

    // update the markers for spell checking and grammar checking

    int diff = arg.length() - count;

    document()->removeMarkers(this, offset, count);

    document()->shiftMarkers(this, offset + count, diff);

}

String CharacterData::nodeValue() const

{

    return str;

}

bool CharacterData::containsOnlyWhitespace(unsigned int from, unsigned int len) const

{

    if (str)

        return str->containsOnlyWhitespace(from, len);

    return true;

}

bool CharacterData::containsOnlyWhitespace() const

{

    if (str)

        return str->containsOnlyWhitespace();

    return true;

}

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

{

    // NO_MODIFICATION_ALLOWED_ERR: taken care of by setData()

    setData(_nodeValue, ec);

}

void CharacterData::dispatchModifiedEvent(StringImpl *prevValue)

{

    if (parentNode())

        parentNode()->childrenChanged();

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

        StringImpl *newValue = str->copy();

        newValue->ref();

        ExceptionCode ec = 0;

        dispatchEvent(new MutationEvent(DOMCharacterDataModifiedEvent,

                      true,false,0,prevValue,newValue,String(),0),ec);

        newValue->deref();

    }

    dispatchSubtreeModifiedEvent();

}

void CharacterData::checkCharDataOperation( const 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 > str->length()) {

        ec = INDEX_SIZE_ERR;

        return;

    }

    // NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly

    if (isReadOnlyNode()) {

        ec = NO_MODIFICATION_ALLOWED_ERR;

        return;

    }

}

int CharacterData::maxOffset() const 

{

    return (int)length();

}

int CharacterData::caretMinOffset() const 

{

    RenderText *r = static_cast<RenderText *>(renderer());

    return r && r->isText() ? r->caretMinOffset() : 0;

}

int CharacterData::caretMaxOffset() const 

{

    RenderText *r = static_cast<RenderText *>(renderer());

    return r && r->isText() ? r->caretMaxOffset() : (int)length();

}

unsigned CharacterData::caretMaxRenderedOffset() const 

{

    RenderText *r = static_cast<RenderText *>(renderer());

    return r ? r->caretMaxRenderedOffset() : length();

}

bool CharacterData::rendererIsNeeded(RenderStyle *style)

{

    if (!str || str->length() == 0)

        return false;

    return EventTargetNode::rendererIsNeeded(style);

}

bool CharacterData::offsetInCharacters() const

{

    return true;

}

#ifndef NDEBUG

void CharacterData::dump(TextStream *stream, DeprecatedString ind) const

{

    *stream << " str=\"" << String(str).deprecatedString().ascii() << "\"";

    EventTargetNode::dump(stream,ind);

}

#endif

} // namespace WebCore