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//====================================================================
// Although great care has gone into developing this software,
// it is provided without any guarantee of reliability, accuracy
// of information, or correctness of operation.  I am not responsible
// for any damages that may occur as a result of using this software.
// Use this software entirely at your own risk.
// Copyright 2003, Chris Richardson
//
// Description: A simple text lexer.
//
//====================================================================

#if !defined(AFX_LEXER_H__141F1594_A9C8_49A1_A9CC_5ABBE15A98BF__INCLUDED_)
#define AFX_LEXER_H__141F1594_A9C8_49A1_A9CC_5ABBE15A98BF__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000

#include "Status.h"
#include "Stream.h"

class CToken;

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

   ParseStatus             SetStream( CStream * p_poStream );
   virtual ParseStatus     Lex( CToken * p_poToken );
   
   inline const TCHAR *    GetName() const;
   inline unsigned long    GetLinePos() const;
   inline unsigned long    GetLine() const;
   
   // Modes so we can handle <include.h> style strings, and so we won't process escape sequences in them.
   typedef enum
   {
      LEX_MODE_PREPROCESSOR,
      LEX_MODE_PARSER
   }LexMode;

   inline void             SetLexMode( LexMode p_eMode );

protected:
   CStream *               c_poStream;
   unsigned long           c_ulLine;
   unsigned long           c_ulLinePos;
   LexMode                 c_eMode;

   inline void             IncLine();

   ParseStatus             EscapeSequence( CToken * p_poToken, int & p_riCurPos );
   ParseStatus             IntegerSuffix( CToken * p_poToken, TCHAR & p_rcChar );
};

inline const TCHAR * CLexer::GetName() const
{
   return c_poStream ? c_poStream->GetName() : NULL;
}
//
// ------------------------------------------------------------------
//
inline void CLexer::IncLine()
{
   c_ulLine++;
   c_ulLinePos = -1;
};
//
// ------------------------------------------------------------------
//
inline unsigned long CLexer::GetLinePos() const
{
   return c_ulLinePos;
}
//
// ------------------------------------------------------------------
//
inline unsigned long CLexer::GetLine() const
{
   return c_ulLine;
}
//
// ------------------------------------------------------------------
//
inline void CLexer::SetLexMode( LexMode p_eMode )
{
   c_eMode = p_eMode;
}
//
// ------------------------------------------------------------------
//

#endif // !defined(AFX_LEXER_H__141F1594_A9C8_49A1_A9CC_5ABBE15A98BF__INCLUDED_)