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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 <private/qatomicmathematician_p.h>
#include <private/qpaircontainer_p.h>

QT_BEGIN_NAMESPACE

namespace QPatternist
{
    /**
     * @short Implements arithmetics, such as multiplication and subtraction.
     *
     *
     * 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

#endif
