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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_SequenceGeneratingFNs_H
#define Patternist_SequenceGeneratingFNs_H

#include "qanyuri_p.h"
#include "qcontextnodechecker_p.h"
#include "qstaticbaseuricontainer_p.h"

/**
 * @file
 * @short Contains classes implementing the functions found in
 * <a href="http://www.w3.org/TR/xpath-functions/#fns-that-generate-sequences">XQuery 1.0 and
 * XPath 2.0 Functions and Operators, 15.5 Functions and Operators that Generate Sequences</a>.
 *
 * @ingroup Patternist_functions
 */

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

namespace QPatternist
{
    /**
     * @short Implements the function <tt>fn:id()</tt>.
     *
     * @ingroup Patternist_functions
     * @author Frans Englich <frans.englich@nokia.com>
     */
    class IdFN : public ContextNodeChecker
    {
    public:
        IdFN();
        typedef QPair<DynamicContext::Ptr, const QAbstractXmlNodeModel *> IDContext;

        virtual Item::Iterator::Ptr evaluateSequence(const DynamicContext::Ptr &context) const;

        inline Item mapToItem(const QString &id,
                              const IDContext &context) const;

        virtual Expression::Ptr typeCheck(const StaticContext::Ptr &context,
                                          const SequenceType::Ptr &reqType);

    private:
        typedef QExplicitlySharedDataPointer<const IdFN> ConstPtr;
        bool m_hasCreatedSorter;
    };

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

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

        /**
         * The implementation of this function is placed in a different compilation unit,
         * namely qsequencefns.cpp, to workaround a compiler bug on
         * solaris-cc-64, suspected to be related to the instantiation of QUrl::toQUrl().
         *
         * @see <a
         * href="http://onesearch.sun.com/search/onesearch/index.jsp?qt=6532605&site=sunsolve&otf=ss&col=support-sunsolve&otf=sunsolve&site=ss&col=search-sunsolve">Sun,
         * multiply-defined label for template instance, bug 6532605</a>
         */
        virtual Expression::Ptr typeCheck(const StaticContext::Ptr &context,
                                          const SequenceType::Ptr &reqType);
        virtual SequenceType::Ptr staticType() const;

    private:
        SequenceType::Ptr m_type;
    };

    /**
     * @short Implements the function <tt>fn:doc-available()</tt>.
     *
     * @ingroup Patternist_functions
     * @author Frans Englich <frans.englich@nokia.com>
     */
    class DocAvailableFN : public StaticBaseUriContainer
    {
    public:
        virtual bool evaluateEBV(const DynamicContext::Ptr &context) const;
    };

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

QT_END_NAMESPACE
QT_END_HEADER

#endif