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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtXmlPatterns module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the either Technology Preview License Agreement or the
** Beta Release License Agreement.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** 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
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain
** additional rights. These rights are described in the Nokia Qt LGPL
** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
** package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at http://qt.nokia.com/contact.
** $QT_END_LICENSE$
**
****************************************************************************/

//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.

#ifndef Patternist_StringValueFNs_H
#define Patternist_StringValueFNs_H

#include <QByteArray>

#include "qfunctioncall_p.h"

/**
 * @file
 * @short Contains classes implementing the functions found in
 * <a href="http://www.w3.org/TR/xpath-functions/#string-value-functions">XQuery 1.0 and
 * XPath 2.0 Functions and Operators, 7.4 Functions on AtomicString Values</a>.
 *
 * @ingroup Patternist_functions
 */

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

namespace QPatternist
{

    /**
     * @short Implements the function <tt>fn:concat()</tt>.
     *
     * @ingroup Patternist_functions
     * @author Frans Englich <frans.englich@nokia.com>
     */
    class ConcatFN : public FunctionCall
    {
    public:
        virtual Item evaluateSingleton(const DynamicContext::Ptr &context) const;
    };

    /**
     * @short Implements the function <tt>fn:string-join()</tt>.
     *
     * @ingroup Patternist_functions
     * @author Frans Englich <frans.englich@nokia.com>
     */
    class StringJoinFN : public FunctionCall
    {
    public:
        virtual Item evaluateSingleton(const DynamicContext::Ptr &context) const;

        /**
         * Optimization: when the cardinality of the sequence of items to join
         * cannot be two or more, we have no effect and therefore rewrite
         * ourselves to our first operand.
         */
        virtual Expression::Ptr compress(const StaticContext::Ptr &context);
    };

    /**
     * @short Implements the function <tt>fn:substring()</tt>.
     *
     * @ingroup Patternist_functions
     * @author Frans Englich <frans.englich@nokia.com>
     */
    class SubstringFN : public FunctionCall
    {
    public:
        virtual Item evaluateSingleton(const DynamicContext::Ptr &context) const;
    };

    /**
     * @short Implements the function <tt>fn:string-length()</tt>.
     *
     * @ingroup Patternist_functions
     * @author Frans Englich <frans.englich@nokia.com>
     */
    class StringLengthFN : public FunctionCall
    {
    public:
        virtual Item evaluateSingleton(const DynamicContext::Ptr &context) const;
    };

    /**
     * @short Implements the function <tt>fn:normalize-space()</tt>.
     *
     * @ingroup Patternist_functions
     * @author Frans Englich <frans.englich@nokia.com>
     */
    class NormalizeSpaceFN : public FunctionCall
    {
    public:
        virtual Item evaluateSingleton(const DynamicContext::Ptr &context) const;
    };

    /**
     * @short Implements the function <tt>fn:normalize-unicode()</tt>.
     *
     * What perhaps can be said significant with the implementation, is that it
     * attempts to determine the normalization form at compile time, in order to
     * reduce string work at runtime.
     *
     * @ingroup Patternist_functions
     * @author Frans Englich <frans.englich@nokia.com>
     */
    class NormalizeUnicodeFN : public FunctionCall
    {
    public:
        /**
         * Initializes private data.
         */
        NormalizeUnicodeFN();
        virtual Item evaluateSingleton(const DynamicContext::Ptr &context) const;
        virtual Expression::Ptr compress(const StaticContext::Ptr &context);

    private:
        int determineNormalizationForm(const DynamicContext::Ptr &context) const;
        QString::NormalizationForm m_normForm;
    };

    /**
     * @short Implements the function <tt>fn:upper-case()</tt>.
     *
     * @ingroup Patternist_functions
     * @author Frans Englich <frans.englich@nokia.com>
     */
    class UpperCaseFN : public FunctionCall
    {
    public:
        virtual Item evaluateSingleton(const DynamicContext::Ptr &context) const;
    };

    /**
     * @short Implements the function <tt>fn:lower-case()</tt>.
     *
     * @short Implements the function <tt>fn:concat()</tt>.
     * @ingroup Patternist_functions
     * @author Frans Englich <frans.englich@nokia.com>
     */
    class LowerCaseFN : public FunctionCall
    {
    public:
        virtual Item evaluateSingleton(const DynamicContext::Ptr &context) const;
    };

    /**
     * @short Implements the function <tt>fn:translate()</tt>.
     *
     * @ingroup Patternist_functions
     * @author Frans Englich <frans.englich@nokia.com>
     */
    class TranslateFN : public FunctionCall
    {
    public:
        virtual Item evaluateSingleton(const DynamicContext::Ptr &context) const;
    };

    /**
     * @short Provides functionality for encoding strings. Sub-classed by various
     * function implementations.
     *
     * @ingroup Patternist_functions
     * @author Frans Englich <frans.englich@nokia.com>
     */
    class EncodeString : public FunctionCall
    {
    public:
        /**
         * Evaluates its first operand. If it is the empty sequence, an empty string
         * is returned. Otherwise, the item's string value is returned percent encoded
         * as specified in this class's constructor.
         */
        virtual Item evaluateSingleton(const DynamicContext::Ptr &context) const;

    protected:
        /**
         * Encodes its operand with QUrl::toPercentEncoding(), with @p includeChars as
         * the characters to encode, and @p excludeChars as the characters to not encode.
         */
        EncodeString(const QByteArray &excludeChars, const QByteArray &includeChars);

    private:
        const QByteArray m_excludeChars;
        const QByteArray m_includeChars;
    };

    /**
     * @short Implements the function <tt>fn:encode-for-uri()</tt>.
     *
     * @ingroup Patternist_functions
     * @author Frans Englich <frans.englich@nokia.com>
     */
    class EncodeForURIFN : public EncodeString
    {
    public:
        /**
         * Performs internal initialization.
         */
        EncodeForURIFN();

    private:
        static const char *const include;
    };

    /**
     * @short Implements the function <tt>fn:iri-to-uri()</tt>.
     *
     * @ingroup Patternist_functions
     * @author Frans Englich <frans.englich@nokia.com>
     */
    class IriToURIFN : public EncodeString
    {
    public:
        /**
         * Performs internal initialization.
         */
        IriToURIFN();

    private:
        static const char *const exclude;
    };

    /**
     * @short Implements the function <tt>fn:escape-html-uri()</tt>.
     *
     * @ingroup Patternist_functions
     * @author Frans Englich <frans.englich@nokia.com>
     */
    class EscapeHtmlURIFN : public EncodeString
    {
    public:
        /**
         * Performs internal initialization.
         */
        EscapeHtmlURIFN();

    private:
        static const char *const include;
        static const char *const exclude;
    };
}

QT_END_NAMESPACE

QT_END_HEADER

#endif