source: trunk/src/xmlpatterns/expr/qquantifiedexpression_p.h@ 612

/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation ([email protected])
**
** This file is part of the QtXmlPatterns module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial Usage
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** 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
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights.  These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you have questions regarding the use of this file, please contact
** Nokia at [email protected].
** $QT_END_LICENSE$
**
****************************************************************************/

//
//  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_QuantifiedExpression_H
#define Patternist_QuantifiedExpression_H

#include "qpaircontainer_p.h"

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

namespace QPatternist
{
    /**
     * @short Implements XPath 2.0's quantification expressions @c some and @c every.
     *
     * @see <a href="http://www.w3.org/TR/xpath20/#id-quantified-expressions">XML Path Language
     * (XPath) 2.0, 3.9 Quantified Expressions</a>
     * @author Frans Englich <[email protected]>
     * @ingroup Patternist_expressions
     */
    class Q_AUTOTEST_EXPORT QuantifiedExpression : public PairContainer
    {
    public:
        enum Operator
        {
            Some    = 1,
            Every
        };

        QuantifiedExpression(const VariableSlotID varSlot,
                             const Operator quantifier,
                             const Expression::Ptr &inClause,
                             const Expression::Ptr &testExpression);

        virtual bool evaluateEBV(const DynamicContext::Ptr &context) const;
        virtual SequenceType::Ptr staticType() const;
        virtual SequenceType::List expectedOperandTypes() const;

        Operator operatorID() const;

        /**
         * Determines the string representation for a quantification operator.
         *
         * @return "some" if @p quantifier is Some, or "every" if @p quantifier
         * is Every
         */
        static QString displayName(const Operator quantifier);

        virtual ExpressionVisitorResult::Ptr accept(const ExpressionVisitor::Ptr &visitor) const;

        inline Item mapToItem(const Item &item, const DynamicContext::Ptr &context) const;

    private:
        typedef QExplicitlySharedDataPointer<const QuantifiedExpression> ConstPtr;
        const VariableSlotID m_varSlot;
        const Operator m_quantifier;
    };
}

QT_END_NAMESPACE

QT_END_HEADER

#endif