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

**

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

** All rights reserved.

** Contact: Nokia Corporation (qt-info@nokia.com)

**

** This file is part of the QtXmlPatterns module of the Qt Toolkit.

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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.

**

** 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

** ensure the GNU Lesser General Public License version 2.1 requirements

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**

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

//

//  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