Lexer.h

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//-----------------------------------------------------------------------------
//  (c) 2006 by Basler Vision Technologies
//  Section: Vision Components
//  Project: GenApi
//  Author:  Margret Albrecht
//  $Header$
//
//  License: Derived from Kirill Zaborski's MathParser library (http://kirya.narod.ru/mathparser.html ).
//  This library comes under LGPL license (see http://www.gnu.org/licenses/lgpl.html).
//  Kirill's implementation is a C++ port of the CCalc library from Walery Studennikov (http://www.sama.ru/~despair/ccalc/)
//  which also comes under the LGPL.
//-----------------------------------------------------------------------------
#ifndef _LEXER_H_
#define _LEXER_H_

#include <cstdlib>

#ifdef __APPLE__
#include <xlocale.h>
#endif

#include "GenApi/Types.h"
#include "GenApi/impl/Internal_Compatibility.h"
#include "SymTable.h"

namespace GENAPI_NAMESPACE
{
    typedef unsigned char uchar;
    
    typedef enum
    {
        CH_LETTER = 0x01, CH_DIGIT = 0x02, CH_SEPARAT = 0x04,
        CH_SYMBOL = 0x08, CH_QUOTE = 0x10,
        CH_UNKNOWN = 0x7E, CH_FINAL = 0x7F
    } hqCharType;
    
    typedef enum
    {
        TOK_ERROR, TOK_NONE, TOK_FINAL, TOK_INT, TOK_FLOAT, TOK_SYMBOL,
        TOK_NAME, TOK_STRING
    } hqTokenType;
    
    class CLexer
    {
        char* m_pSS;
        char* SS;
    #ifdef _WIN32
        _locale_t CLocale;
    #else
    #ifndef VXWORKS
        locale_t CLocale;
    #endif
    #endif
    public:
        void SetParams( int cssn, const char ComEnd[], const CSymTable* SymTable, const hqCharType* CharTypeTable );
    private:
        // input params
        int                 cssn;    // Comment Start Symbol Number. -1 if none
        char*               ComEnd;    // End of comment
        const CSymTable*    SymTable;
        const hqCharType*   CharTypeTable;
    public:
        // output params
        char*       Name;
        size_t        NameLen;
        double    ExtValue;
        int        IntValue;
        hqTokenType PrevTokenType;
        hqCharType    CharType;
        int        NoIntegers;
    public:
        int SetParseString( const char* str );
        hqTokenType GetNextToken();
        CLexer();
        ~CLexer();
        char* GetCurrentPos();
    private:
        CLexer(const CLexer&);            // copy constructor is not implemented
        CLexer operator =(const CLexer&); // assignment operator is not implemented
    };
    
} /* GENAPI_NAMESPACE*/

#endif //_LEXER_H_