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

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

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

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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_BooleanFNs_H

#define Patternist_BooleanFNs_H

#include "qfunctioncall_p.h"

/**

 * @file

 * @short Contains classes implementing the functions found in

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

 * XPath 2.0 Functions and Operators, 9 Functions and Operators on Boolean Values</a>.

 *

 * @ingroup Patternist_functions

 */

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

namespace QPatternist

{

    /**

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

     *

     * The implementation always rewrites itself to a boolean value at compile time.

     *

     * @ingroup Patternist_functions

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

     */

    class TrueFN : public FunctionCall

    {

    public:

        virtual bool evaluateEBV(const DynamicContext::Ptr &context) const;

    };

    /**

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

     *

     * The implementation always rewrites itself to a boolean value at compile time.

     *

     * @ingroup Patternist_functions

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

     */

    class FalseFN : public FunctionCall

    {

    public:

        virtual bool evaluateEBV(const DynamicContext::Ptr &context) const;

    };

    /**

     * @short Implements the function <tt>fn:not()</tt>.

     *

     * @ingroup Patternist_functions

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

     */

    class NotFN : public FunctionCall

    {

    public:

        virtual bool evaluateEBV(const DynamicContext::Ptr &context) const;

        virtual QList<QExplicitlySharedDataPointer<OptimizationPass> > optimizationPasses() const;

    };

}

QT_END_NAMESPACE

QT_END_HEADER

#endif