/****************************************************************************
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** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
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** This file is part of the QtXmlPatterns module of the Qt Toolkit.
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** $QT_BEGIN_LICENSE:LGPL21$
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** accordance with the commercial license agreement provided with the
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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_RangeVariableReference_H
#define Patternist_RangeVariableReference_H

#include <private/qvariablereference_p.h>

QT_BEGIN_NAMESPACE

namespace QPatternist
{
    /**
     * @short A reference to a variable declared with @c for or a quantification
     * expression, but not for instance a @c let binding.
     *
     * A range variable always represents a single item, while an other
     * expression provides the binding and iteration. A @c for expression is
     * a good example.
     *
     * @author Frans Englich <frans.englich@nokia.com>
     * @ingroup Patternist_expressions
     */
    class RangeVariableReference : public VariableReference
    {
    public:
        RangeVariableReference(const Expression::Ptr &sourceExpression,
                               const VariableSlotID slot);

        virtual bool evaluateEBV(const DynamicContext::Ptr &context) const;
        virtual Item evaluateSingleton(const DynamicContext::Ptr &context) const;
        virtual SequenceType::Ptr staticType() const;

        /**
         * @returns IDRangeVariableReference
         */
        virtual ID id() const;

        virtual ExpressionVisitorResult::Ptr accept(const ExpressionVisitor::Ptr &visitor) const;
        virtual Properties properties() const;
    private:
        const Expression::Ptr m_sourceExpression;
    };
}

QT_END_NAMESPACE

#endif