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

**

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

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

//

//  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_NodeFNs_H

#define Patternist_NodeFNs_H

#include "qfunctioncall_p.h"

#include "qcastingplatform_p.h"

/**

 * @file

 * @short Contains classes implementing the functions found in

 * <a href="http://www.w3.org/TR/xpath-functions/#node-functions">XQuery 1.0 and

 * XPath 2.0 Functions and Operators, 14 Functions and Operators on Nodes</a>.

 *

 * @ingroup Patternist_functions

 */

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

namespace QPatternist

{

    /**

     * @short Implements the function <tt>fn:name()</tt>.

     *

     * @ingroup Patternist_functions

     * @author Frans Englich <frans.englich@nokia.com>

     */

    class NameFN : public FunctionCall

    {

    public:

        virtual Item evaluateSingleton(const DynamicContext::Ptr &context) const;

    };

    /**

     * @short Implements the function <tt>fn:local-name()</tt>.

     *

     * @ingroup Patternist_functions

     * @author Frans Englich <frans.englich@nokia.com>

     */

    class LocalNameFN : public FunctionCall

    {

    public:

        virtual Item evaluateSingleton(const DynamicContext::Ptr &context) const;

    };

    /**

     * @short Implements the function <tt>fn:namespace-uri()</tt>.

     *

     * @ingroup Patternist_functions

     * @author Frans Englich <frans.englich@nokia.com>

     */

    class NamespaceURIFN : public FunctionCall

    {

    public:

        virtual Item evaluateSingleton(const DynamicContext::Ptr &context) const;

    };

    /**

     * @short Implements the function <tt>fn:number()</tt>.

     *

     * NumberFN uses CastingPlatform for performing the actual casting.

     *

     * @ingroup Patternist_functions

     * @author Frans Englich <frans.englich@nokia.com>

     */

    class NumberFN : public FunctionCall,

                     public CastingPlatform<NumberFN, false>

    {

    public:

        virtual Item evaluateSingleton(const DynamicContext::Ptr &context) const;

        /**

         * Overridden in order to call CastingPlatform::prepareCasting(). It also

         * implements the optimization of rewriting to its operand if its

         * type is xs:double(since the <tt>fn:number()</tt> call is in that case superflorous).

         */

        virtual Expression::Ptr typeCheck(const StaticContext::Ptr &context,

                                          const SequenceType::Ptr &reqType);

        /**

         * @returns always BuiltinTypes::xsDouble.

         */

        inline ItemType::Ptr targetType() const

        {

            return BuiltinTypes::xsDouble;

        }

    };

    /**

     * @short Implements the function <tt>fn:lang()</tt>.

     *

     * @ingroup Patternist_functions

     * @author Frans Englich <frans.englich@nokia.com>

     */

    class LangFN : public FunctionCall

    {

    public:

        virtual Item evaluateSingleton(const DynamicContext::Ptr &context) const;

    private:

        static inline bool isLangMatch(const QString &candidate, const QString &toMatch);

    };

    /**

     * @short Implements the function <tt>fn:root()</tt>.

     *

     * @ingroup Patternist_functions

     * @author Frans Englich <frans.englich@nokia.com>

     */

    class RootFN : public FunctionCall

    {

    public:

        virtual Item evaluateSingleton(const DynamicContext::Ptr &context) const;

        /**

         * Infers its cardinality from the argument.

         */

        virtual SequenceType::Ptr staticType() const;

    };

}

QT_END_NAMESPACE

QT_END_HEADER

#endif