/*

 * Copyright (C) 2006, 2007 Rob Buis

 * Copyright (C) 2008 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 "StyleElement.h"

#include "Attribute.h"

#include "Document.h"

#include "Element.h"

#include "MediaList.h"

#include "MediaQueryEvaluator.h"

namespace WebCore {

StyleElement::StyleElement()

{

}

StyleSheet* StyleElement::sheet(Element* e)

{

    if (!m_sheet)

        createSheet(e, 0);

    return m_sheet.get();

}

void StyleElement::insertedIntoDocument(Document*, Element* element)

{

    process(element, 0);

}

void StyleElement::removedFromDocument(Document* document)

{

    // If we're in document teardown, then we don't need to do any notification of our sheet's removal.

    if (!document->renderer())

        return;

    // FIXME: It's terrible to do a synchronous update of the style selector just because a <style> or <link> element got removed.

    if (m_sheet)

        document->updateStyleSelector();

}

void StyleElement::process(Element* e, int startLineNumber)

{

    if (!e || !e->inDocument())

        return;

    unsigned resultLength = 0;

    for (Node* c = e->firstChild(); c; c = c->nextSibling()) {

        Node::NodeType nodeType = c->nodeType();

        if (nodeType == Node::TEXT_NODE || nodeType == Node::CDATA_SECTION_NODE || nodeType == Node::COMMENT_NODE)

            resultLength += c->nodeValue().length();

    }

    UChar* text;

    String sheetText = String::createUninitialized(resultLength, text);

    UChar* p = text;

    for (Node* c = e->firstChild(); c; c = c->nextSibling()) {

        Node::NodeType nodeType = c->nodeType();

        if (nodeType == Node::TEXT_NODE || nodeType == Node::CDATA_SECTION_NODE || nodeType == Node::COMMENT_NODE) {

            String nodeValue = c->nodeValue();

            unsigned nodeLength = nodeValue.length();

            memcpy(p, nodeValue.characters(), nodeLength * sizeof(UChar));

            p += nodeLength;

        }

    }

    ASSERT(p == text + resultLength);

    createSheet(e, startLineNumber, sheetText);

}

void StyleElement::createSheet(Element* e, int startLineNumber, const String& text)

{

    Document* document = e->document();

    if (m_sheet) {

        if (static_cast<CSSStyleSheet*>(m_sheet.get())->isLoading())

            document->removePendingSheet();

        m_sheet = 0;

    }

    // If type is empty or CSS, this is a CSS style sheet.

    const AtomicString& type = this->type();

    if (type.isEmpty() || (e->isHTMLElement() ? equalIgnoringCase(type, "text/css") : (type == "text/css"))) {

        RefPtr<MediaList> mediaList = MediaList::create(media(), e->isHTMLElement());

        MediaQueryEvaluator screenEval("screen", true);

        MediaQueryEvaluator printEval("print", true);

        if (screenEval.eval(mediaList.get()) || printEval.eval(mediaList.get())) {

            document->addPendingSheet();

            setLoading(true);

            m_sheet = CSSStyleSheet::create(e, String(), KURL(), document->inputEncoding());

            m_sheet->parseStringAtLine(text, !document->inCompatMode(), startLineNumber);

            m_sheet->setMedia(mediaList.get());

            m_sheet->setTitle(e->title());

            setLoading(false);

        }

    }

    if (m_sheet)

        m_sheet->checkLoaded();

}

}