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/* Copyright (c) 2005-2014 Rexx Language Association. All rights reserved.    */
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/*----------------------------------------------------------------------------*/
/******************************************************************************/
/* REXX Kernel                                       ExpressionOperator.hpp   */
/*                                                                            */
/* Primitive Expression Operator Class Definitions                            */
/*                                                                            */
/******************************************************************************/
#ifndef Included_RexxExpressionOperator
#define Included_RexxExpressionOperator

#include "Token.hpp"

class RexxExpressionOperator : public RexxInternalObject
{
 public:
    inline RexxExpressionOperator() { ; }

    RexxExpressionOperator(TokenSubclass, RexxInternalObject *, RexxInternalObject *);
    inline RexxExpressionOperator(RESTORETYPE restoreType) { ; };

    void   live(size_t) override;
    void   liveGeneral(MarkReason reason) override;
    void   flatten(Envelope *) override;

    inline const char *operatorName() { return operatorNames[oper]; }

protected:
    // table of operator names
    static const char *operatorNames[];

    TokenSubclass  oper;                 // operation to perform
    RexxInternalObject *right_term;      // right term of the operator
    RexxInternalObject *left_term;       // left term of the operator
};

class RexxBinaryOperator : public RexxExpressionOperator
{
 public:
    void  *operator new(size_t);
    inline void  operator delete(void *) { ; }

    inline RexxBinaryOperator(TokenSubclass op, RexxInternalObject *left, RexxInternalObject *right)
        : RexxExpressionOperator(op, left, right) { ; }
    inline RexxBinaryOperator(RESTORETYPE restoreType) { ; };

    RexxObject *evaluate(RexxActivation *, ExpressionStack *) override;
};


class RexxUnaryOperator : public RexxExpressionOperator {
 public:
    void  *operator new(size_t);
    inline void  operator delete(void *) { ; }

    inline RexxUnaryOperator(TokenSubclass op, RexxInternalObject *left)
        : RexxExpressionOperator(op, left, OREF_NULL) { ; }
    inline RexxUnaryOperator(RESTORETYPE restoreType) { ; };

    RexxObject *evaluate(RexxActivation *, ExpressionStack *) override;
};
#endif
