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/*
   Copyright (C) 2009-2019 Andreas Franz Borchert
                           Michael Christian Lehn
   ----------------------------------------------------------------------------
   Astl-ULMcalc is free software; you can redistribute it
   and/or modify it under the terms of the GNU Library General Public
   License as published by the Free Software Foundation; either version
   2 of the License, or (at your option) any later version.

   Astl-ULMcalc 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
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with this library; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#ifndef ASTL_ULMCALC_SCANNER_HPP
#define ASTL_ULMCALC_SCANNER_HPP

#include <iostream>
#include <memory>
#include "parser.hpp"
#include "location.hpp"

namespace AstlULMcalc {

   typedef parser::semantic_type semantic_type;

   class Scanner {
      public:
         Scanner(std::istream& in, const std::string& input_name);

         // mutators
         int get_token(semantic_type& yylval, location& yylloc);

      private:
         std::istream& in;
         std::string input_name;
         unsigned char ch;
         bool eof;
         int lasttoken; // last token returned by get_token()
         position oldpos, pos;
         location tokenloc;
         std::unique_ptr<std::string> tokenstr;
         std::string processed_tokenstr; /* actual value of literals */

         // private mutators
         void nextch();
         void error(char const* msg);
         void convert_to_utf8();
   };

   inline int yylex(semantic_type* yylval, location* yylloc, Scanner& scanner) {
      return scanner.get_token(*yylval, *yylloc);
   }

} // namespace AstlULMcalc

#endif