/*

* Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

*

* This program is free software: you can redistribute it and/or modify

* it under the terms of the GNU Lesser General Public License as published by

* the Free Software Foundation, version 2.1 of the License.

*

* This program 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 Lesser General Public License for more details.

*

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

* along with this program.  If not,

* see "http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html/".

*

* Description:

*

*/

#include "ViewportMetaDataParser.h"

namespace GVA {

ViewportMetaDataParser::ViewportMetaDataParser(const QRect& clientRect)

            : m_clientRect(clientRect)

{}

ViewportMetaDataParser::~ViewportMetaDataParser()

{}

ViewportMetaData ViewportMetaDataParser::parse(const QString& viewportParams)

{

    ViewportMetaData viewportMetaData = processArguments(viewportParams);

    viewportMetaData.adjustViewportData(m_clientRect);

    return viewportMetaData;

}

//W A R N I N G

//FOLLOWING CODE HAS BEEN TAKEN FROM WebCore/dom/Document.cpp

//NEED TO REMOVE WHEN QtWebkit provides viewport param API

// Though isspace() considers \t and \v to be whitespace, Win IE doesn't.

bool ViewportMetaDataParser::isSeparator(QChar c)

{

    return c == ' '

            || c == '\t'

            || c == '\n'

            || c == '\r'

            || c == '='

            || c == ','

            || c == '\0'

            || c == ';';

}

ViewportMetaData ViewportMetaDataParser::processArguments(const QString& features)

{

    int keyBegin, keyEnd;

    int valueBegin, valueEnd;

    ViewportMetaData viewportMetaData;

    int i = 0;

    int length = features.length();

    QString buffer = features.toLower();

    while (i < length) {

        // skip to first non-separator, but don't skip past the end of the string

        while (isSeparator(buffer[i])) {

            if (i >= length)

                break;

            i++;

        }

        keyBegin = i;

        // skip to first separator

        while (!isSeparator(buffer[i]))

            i++;

        keyEnd = i;

        // skip to first '=', but don't skip past a ',' or the end of the string

        while (buffer[i] != '=') {

            if (buffer[i] == ',' || i >= length)

                break;

            i++;

        }

        // skip to first non-separator, but don't skip past a ',' or the end of the string

        while (isSeparator(buffer[i])) {

            if (buffer[i] == ',' || i >= length)

                break;

            i++;

        }

        valueBegin = i;

        // skip to first separator

        while (!isSeparator(buffer[i]))

            i++;

        valueEnd = i;

        Q_ASSERT(i <= length);

        QString keyString = buffer.mid(keyBegin, keyEnd - keyBegin);

        QString valueString = buffer.mid(valueBegin, valueEnd - valueBegin);

        setViewportFeature(keyString, valueString, viewportMetaData);

    }

    return viewportMetaData;

}

void ViewportMetaDataParser::setViewportFeature(const QString& keyString, const QString& valueString, ViewportMetaData& viewportMetaData)

{

    float value = ViewportMetaData::ValueUndefined;

    if (QString::compare(valueString, "device-width", Qt::CaseInsensitive) == 0)

        value = m_clientRect.width();

    else if (QString::compare(valueString, "device-height", Qt::CaseInsensitive) == 0)

        value = m_clientRect.height();

    else if (QString::compare(valueString, "default", Qt::CaseInsensitive) == 0) {

        // This allows us to distinguish the omission of a key from asking for the default value.

        value = -2;

    }

    else if (valueString.length()) {

        // listing a key with no value is shorthand for key=default

        value = valueString.toDouble();

    }

    if (keyString == "initial-scale") {

        viewportMetaData.m_initialScale = value;

        viewportMetaData.setFlag(ViewportMetaData::UserDefinedInitialScale,true);

    }

    else if (keyString == "minimum-scale") {

        viewportMetaData.m_minimumScale = value;

        viewportMetaData.m_specifiedData.m_minScale = value;

        viewportMetaData.setFlag(ViewportMetaData::UserDefinedMinumumScale,true);

    }

    else if (keyString == "maximum-scale") {

        viewportMetaData.m_maximumScale = value;

        viewportMetaData.setFlag(ViewportMetaData::UserDefinedMaximumScale,true);

    }

    else if (keyString == "user-scalable") {

        if (QString::compare(valueString, "yes", Qt::CaseInsensitive) == 0)

            viewportMetaData.m_userScalable = true;

        else

            viewportMetaData.m_userScalable = false;

    }

    else if (keyString == "width") {

        viewportMetaData.m_width = value;

        viewportMetaData.m_specifiedData.m_width = valueString;

    }

    else if (keyString == "height") {

        viewportMetaData.m_height = value;

        viewportMetaData.m_specifiedData.m_height = valueString;

    }

}

} //namespace GVA