/****************************************************************************

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** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).

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** No Commercial Usage

** This file contains pre-release code and may not be distributed.

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** contained in the Technology Preview License Agreement accompanying

** this package.

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** GNU Lesser General Public License Usage

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** General Public License version 2.1 as published by the Free Software

** Foundation and appearing in the file LICENSE.LGPL included in the

** packaging of this file.  Please review the following information to

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** $QT_END_LICENSE$

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****************************************************************************/

#ifndef QHELP_GLOBAL_H

#define QHELP_GLOBAL_H

#include <QtCore/qglobal.h>

#include <QtCore/QString>

#include <QtCore/QObject>

#include <QtCore/QRegExp>

#include <QtCore/QMutexLocker>

#include <QtGui/QTextDocument>

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

QT_MODULE(Help)

#if !defined(QT_SHARED) && !defined(QT_DLL)

#   define QHELP_EXPORT

#elif defined(QHELP_LIB)

#   define QHELP_EXPORT Q_DECL_EXPORT

#else

#   define QHELP_EXPORT Q_DECL_IMPORT

#endif

class QHelpGlobal {

public:

    static QString uniquifyConnectionName(const QString &name, void *pointer)

    {

        static int counter = 0;

        static QMutex mutex;

        QMutexLocker locker(&mutex);

        if (++counter > 1000)

            counter = 0;

        return QString::fromLatin1("%1-%2-%3")

            .arg(name).arg(long(pointer)).arg(counter);

    };

    static QString documentTitle(const QString &content)

    {

        QString title = QObject::tr("Untitled");

        if (!content.isEmpty()) {

            int start = content.indexOf(QLatin1String("<title>"), 0, Qt::CaseInsensitive) + 7;

            int end = content.indexOf(QLatin1String("</title>"), 0, Qt::CaseInsensitive);

            if ((end - start) > 0) {

                title = content.mid(start, end - start);

                if (Qt::mightBeRichText(title) || title.contains(QLatin1Char('&'))) {

                    QTextDocument doc;

                    doc.setHtml(title);

                    title = doc.toPlainText();

                }

            }

        }

        return title;

    };

    static QString charsetFromData(const QByteArray &data)

    {

        QString content = QString::fromUtf8(data.constData(), data.size());

        int start =

            content.indexOf(QLatin1String("<meta"), 0, Qt::CaseInsensitive);

        if (start > 0) {

            int end;

            QRegExp r(QLatin1String("charset=([^\"\\s]+)"));

            while (start != -1) {

                end = content.indexOf(QLatin1Char('>'), start) + 1;

                const QString &meta = content.mid(start, end - start).toLower();

                if (r.indexIn(meta) != -1)

                    return r.cap(1);

                start = content.indexOf(QLatin1String("<meta"), end,

                    Qt::CaseInsensitive);

            }

        }

        return QLatin1String("utf-8");

    }

};

QT_END_NAMESPACE

QT_END_HEADER

#endif // QHELP_GLOBAL_H