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InputParser.h

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// Parser.h: interface for the CParser class.
// Eindhoven University of Technology 1997
// OOPS team (Serge vd Boom, Erwin Coumans, Tom Geelen, Wynke Stuylemeier)
/*
 * Copyright (c) 1996-2000 Erwin Coumans <coockie@acm.org>
 *
 * Permission to use, copy, modify, distribute and sell this software
 * and its documentation for any purpose is hereby granted without fee,
 * provided that the above copyright notice appear in all copies and
 * that both that copyright notice and this permission notice appear
 * in supporting documentation.  Erwin Coumans makes no
 * representations about the suitability of this software for any
 * purpose.  It is provided "as is" without express or implied warranty.
 *
 */
#ifndef __INPUTPARSER_H__
#define __INPUTPARSER_H__

class CParser;
#include "Expression.h"


class CParser {
public:
        CParser();
        virtual                         ~CParser();

        float                           GetFloat(CCString txt);
        CValue*                         GetValue(CCString txt, bool bFallbackToText=false);
        CExpression*            ProcessText(CCString intext);
        void                            SetContext(CValue* context);

private:
        enum symbols {errorsym, lbracksym, rbracksym, cellsym, commasym,
                opsym, constsym, sumsym, ifsym, whocodedsym, eolsym,idsym};                     // all kinds of symbols
        enum optype { OPplus, OPminus, OPtimes, OPdivide, OPand, OPor, OPequal,
                OPunequal, OPgreater, OPless, OPgreaterequal, OPlessequal, OPnot };             // all kinds of operators
        enum consttype { booltype, inttype, floattype, stringtype };            // all kinds of constants
        
        int sym,                                        // current symbol
                opkind,                                 // kind of operator, if symbol is an operator
                constkind;                              // kind of operator, if symbol is a constant
        
        char ch;                                        // current character
        int chcount;                            // index to character in input string
        CExpression *errmsg;            // contains a errormessage, if scanner error
        
        CCString text,                          // contains a copy of the original text
                const_as_string;                // string representation of the symbol, if symbol is a constant
        bool boolvalue;                         // value of the boolean, if symbol is a constant of type boolean
        CValue* m_identifierContext;// context in which identifiers are looked up
        
        
        void ScanError(CCString str);
        CExpression* Error(CCString str);
        void NextCh();
        void TermChar(char c);
        void DigRep();
        void CharRep();
        void GrabString(int start);
        void NextSym();
        int MakeInt();
        CCString Symbol2Str(int s);
        void Term(int s);
        int Priority(int optor);
        CExpression *Ex(int i);
        CExpression *Expr();

};

#endif

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