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"

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();
};


#endif //_LEXER_H_