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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_ArithmeticExpression_H

#define Patternist_ArithmeticExpression_H

#include "qatomicmathematician_p.h"

#include "qpaircontainer_p.h"

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

namespace QPatternist

{

    /**

     * @short Implements arithmetics, such as multiplication and substraction.

     *

     *

     * Optimizations: there's some operator/value combos that are no ops. For

     * instance, 0 + <value>, which is the case of unary plus. We can't compile

     * those away early due to that type checks needs to be done but one can

     * check for them in compress().

     *

     * @see <a href="http://www.w3.org/TR/xpath20/#id-arithmetic">XML Path Language

     * (XPath) 2.0, 3.4 Arithmetic Expressions</a>

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

     * @ingroup Patternist_expressions

     */

    class Q_AUTOTEST_EXPORT ArithmeticExpression : public PairContainer

    {

    public:

        ArithmeticExpression(const Expression::Ptr &operand1,

                             const AtomicMathematician::Operator op,

                             const Expression::Ptr &operand2);

        virtual Item evaluateSingleton(const DynamicContext::Ptr &context) const;

        virtual SequenceType::Ptr staticType() const;

        virtual SequenceType::List expectedOperandTypes() const;

        AtomicMathematician::Operator operatorID() const;

        virtual Expression::Ptr typeCheck(const StaticContext::Ptr &context,

                                          const SequenceType::Ptr &reqType);

        static Item flexiblyCalculate(const Item &op1,

                                      const AtomicMathematician::Operator op,

                                      const Item &op2,

                                      const AtomicMathematician::Ptr &mather,

                                      const DynamicContext::Ptr &context,

                                      const SourceLocationReflection *const reflection,

                                      const ReportContext::ErrorCode code = ReportContext::XPTY0004,

                                      const bool isCompat = false);

        static AtomicMathematician::Ptr

        fetchMathematician(Expression::Ptr &t1,

                           Expression::Ptr &t2,

                           const AtomicMathematician::Operator op,

                           const bool issueError,

                           const ReportContext::Ptr &context,

                           const SourceLocationReflection *const reflection,

                           const ReportContext::ErrorCode code = ReportContext::XPTY0004,

                           const bool isCompat = false);

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

    protected:

    private:

        const AtomicMathematician::Operator m_op;

        AtomicMathematician::Ptr            m_mather;

        bool                                m_isCompat;

    };

    inline AtomicMathematician::Operator ArithmeticExpression::operatorID() const

    {

        return m_op;

    }

}

QT_END_NAMESPACE

QT_END_HEADER

#endif