source: trunk/src/xmlpatterns/functions/qnodefns_p.h@ 561

/****************************************************************************
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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 <[email protected]>
     */
    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 <[email protected]>
     */
    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 <[email protected]>
     */
    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 <[email protected]>
     */
    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 <[email protected]>
     */
    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 <[email protected]>
     */
    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