qatomiccomparator_p.h

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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_AtomicComparator_H
#define Patternist_AtomicComparator_H

#include <QFlags>

#include "qitem_p.h"
#include "qatomictypedispatch_p.h"

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

class QString;

namespace QPatternist
{

    class Q_AUTOTEST_EXPORT AtomicComparator : public AtomicTypeVisitorResult
    {
    public:
        AtomicComparator();
        virtual ~AtomicComparator();

        typedef QExplicitlySharedDataPointer<AtomicComparator> Ptr;

        enum Operator
        {
            OperatorEqual           = 1,

            OperatorNotEqual        = 1 << 1,

            OperatorGreaterThan     = 1 << 2,

            OperatorLessThan        = 1 << 3,

            OperatorLessThanNaNLeast    = 1 << 4,

            OperatorLessThanNaNGreatest    = 1 << 5,

            OperatorGreaterOrEqual  = OperatorEqual | OperatorGreaterThan,

            OperatorLessOrEqual     = OperatorEqual | OperatorLessThan
        };

        typedef QFlags<Operator> Operators;

        enum ComparisonResult
        {
            LessThan     = 1,
            Equal        = 2,
            GreaterThan  = 4,
            Incomparable = 8
        };

        virtual ComparisonResult compare(const Item &op1,
                                         const AtomicComparator::Operator op,
                                         const Item &op2) const;

        virtual bool equals(const Item &op1,
                            const Item &op2) const = 0;

        enum ComparisonType
        {
            AsGeneralComparison = 1,

            AsValueComparison
        };

        static QString displayName(const AtomicComparator::Operator op,
                                   const ComparisonType type);

    };
    Q_DECLARE_OPERATORS_FOR_FLAGS(AtomicComparator::Operators)
}

QT_END_NAMESPACE

QT_END_HEADER

#endif