rpn_handler.h

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// Name:        rpn_handler.h
// Purpose:     
// Author:      NDA
// Modified by: 
// Created:     09/01/07 16:54
// RCS-ID:      
// Copyright:   CAEN S.p.A All rights reserved.
// Licence:     

#ifndef _RPN_HANDLER_H_
#define _RPN_HANDLER_H_

#if defined(__GNUG__) && !defined(__APPLE__)
#pragma interface "rpn_handler.h"
#endif

class VirtualBoardChannel;
typedef enum
{
        RPN_OPERATOR_ADD= 0,            // Add Operator
        RPN_OPERATOR_SUB,                       // Subtract Operator
        RPN_OPERATOR_MUL,                       // Multiply Operator
        RPN_OPERATOR_DIV,                       // Divide Operator

        RPN_OPERAND_CH0,                        // Channel 0 Operand
        RPN_OPERAND_CH1,                        // Channel 1 Operand
        RPN_OPERAND_CH2,                        // Channel 2 Operand
        RPN_OPERAND_CH3,                        // Channel 3 Operand
        RPN_OPERAND_CH4,                        // Channel 4 Operand
        RPN_OPERAND_CH5,                        // Channel 5 Operand
        RPN_OPERAND_CH6,                        // Channel 6 Operand
        RPN_OPERAND_CH7,                        // Channel 7 Operand

        RPN_OPERAND_CONST,                      // Constant value Operand : let as the least
} RpnTypes;

#ifndef LPCSTR 
typedef const char* LPCSTR;
#endif
//
// Rpn name s for string parsing
const LPCSTR RpnTypesNames[]=
{
        "ADD",                  // Add Operator
        "SUB",                  // Subtract Operator
        "MUL",                  // Multiply Operator
        "DIV",                  // Divide Operator
        
        "CH0",                  // Channel 1 Operand
        "CH1",                  // Channel 2 Operand
        "CH2",                  // Channel 3 Operand
        "CH3",                  // Channel 4 Operand
        "CH4",                  // Channel 5 Operand
        "CH5",                  // Channel 6 Operand
        "CH6",                  // Channel 7 Operand
        "CH7",                  // Channel 7 Operand

        // Any other undefined name will be handled as CONST operand value
};
struct RpnItem
{
        bool m_processed;
        double m_value;
        RpnTypes m_type;
};

class RpnHandler
{
public:
        RpnHandler( VirtualBoardChannel* parent, const char *expression_def);
        ~RpnHandler( void);

        bool Parse( const char *expression_def);
        const char* Format( void);
        bool Test( void);
        bool Eval( double &result);
        unsigned int GetBufferCount( void);
protected:
        RpnItem* m_rpn_items_array;
        RpnItem* m_tmp_rpn_items_array;
        int m_rpn_array_alloc_size;
        int m_rpn_array_real_size;
        char* m_expression_def;
        bool DoEval( double *p_result);
        VirtualBoardChannel* m_parent;
        int m_ref_channel_index;
        
};


#endif  // _RPN_HANDLER_H_

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