src/lisp/lexer.hpp

Go to the documentation of this file.
00001 //  SuperTux
00002 //  Copyright (C) 2006 Matthias Braun <matze@braunis.de>
00003 //
00004 //  This program is free software: you can redistribute it and/or modify
00005 //  it under the terms of the GNU General Public License as published by
00006 //  the Free Software Foundation, either version 3 of the License, or
00007 //  (at your option) any later version.
00008 //
00009 //  This program is distributed in the hope that it will be useful,
00010 //  but WITHOUT ANY WARRANTY; without even the implied warranty of
00011 //  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00012 //  GNU General Public License for more details.
00013 //
00014 //  You should have received a copy of the GNU General Public License
00015 //  along with this program.  If not, see <http://www.gnu.org/licenses/>.
00016 
00017 #ifndef HEADER_SUPERTUX_LISP_LEXER_HPP
00018 #define HEADER_SUPERTUX_LISP_LEXER_HPP
00019 
00020 #include <istream>
00021 
00022 namespace lisp {
00023 
00024 class Lexer
00025 {
00026 public:
00027   enum TokenType {
00028     TOKEN_EOF,
00029     TOKEN_OPEN_PAREN,
00030     TOKEN_CLOSE_PAREN,
00031     TOKEN_SYMBOL,
00032     TOKEN_STRING,
00033     TOKEN_INTEGER,
00034     TOKEN_REAL,
00035     TOKEN_TRUE,
00036     TOKEN_FALSE
00037   };
00038 
00039   Lexer(std::istream& stream);
00040   ~Lexer();
00041 
00042   TokenType getNextToken();
00043   const char* getString() const
00044   { return token_string; }
00045   int getLineNumber() const
00046   { return linenumber; }
00047 
00048 private:
00049   enum {
00050     MAX_TOKEN_LENGTH = 16384,
00051     BUFFER_SIZE = 1024
00052   };
00053 
00054   inline void nextChar();
00055   inline void addChar();
00056 
00057 private:
00058   std::istream& stream;
00059   bool eof;
00060   int linenumber;
00061   char buffer[BUFFER_SIZE+1];
00062   char* bufend;
00063   char* bufpos;
00064   int  c;
00065   char token_string[MAX_TOKEN_LENGTH + 1];
00066   int token_length;
00067 
00068 private:
00069   Lexer(const Lexer&);
00070   Lexer & operator=(const Lexer&);
00071 };
00072 
00073 } // end of namespace lisp
00074 
00075 #endif
00076 
00077 /* EOF */

Generated on Mon Jun 9 03:38:18 2014 for SuperTux by  doxygen 1.5.1