Lexer.hpp

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//  This file is part of ff3d - http://www.freefem.org/ff3d
//  Copyright (C) 2001, 2002, 2003 Stéphane Del Pino

//  This program is free software; you can redistribute it and/or modify
//  it under the terms of the GNU General Public License as published by
//  the Free Software Foundation; either version 2, or (at your option)
//  any later version.

//  This program is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//  GNU General Public License for more details.

//  You should have received a copy of the GNU General Public License
//  along with this program; if not, write to the Free Software Foundation,
//  Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  

//  $Id: Lexer.hpp,v 1.6 2007/06/09 10:37:08 delpinux Exp $

// This is the Lexer replacement to Flex. The reason for changing flex
// is the portability: it is not available at this very moment using CodeWarrior 6.
// This is a base class. Its derived classes will be used for different languages.

#ifndef LEXER_HPP
#define LEXER_HPP

#include <cstring>
#include <map>

#include <StreamCenter.hpp>

#include <cstddef>

class Lexer
{
private:
  size_t WordMaxLenght;

  struct eqstr
  {
    bool operator()(const char* s1, const char* s2) const
    {
      return std::strcmp(s1, s2) < 0;
    }
  };

protected:
  std::istream& in;

  std::ostream& out;

  size_t linenumber;

  std::string yytext;

public:
  typedef std::map<const char*, int,
                   Lexer::eqstr> KeyWordList;

protected:
  KeyWordList __keyWordList;

  int declarationToken;
public:

  Lexer(std::istream& In,
        std::ostream& Out = std::cout,
        const size_t WMaxL = 255)
    : WordMaxLenght(WMaxL),
      in(In),
      out(Out)      
  {
    //    yytext = new char[WMaxL+1];
    linenumber = 1;
  }

  virtual ~Lexer()
  {
    ;
  }

  virtual int yylex() = 0;

  const size_t& lineno() const
  {
    return linenumber;
  }

  const char* YYText() const
  {
    return yytext.c_str();
  }
};

#endif // LEXER_HPP

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