//  Clint - Source code checker for C++
//  Copyright (C) 2001  David Pashley
//
//  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 of the License, 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

#ifndef __INPUT_H__
#define __INPUT_H__
#include <iostream>
#include <fstream>
#include <string>
#include <stack>
#include <map>
#include <vector>

namespace clint {
   struct Pair {
      std::string first;
      std::string second;
   };

   // Input is a singleton. 
   // Get access to it through Input::instance()
   class Input {
      private:
         struct File_Status {
            std::istream * input;
            std::string file;
            int line;
         };

         std::stack<File_Status> m_file_status;
         File_Status m_cur_file;
         static Input * m_instance;
         bool m_input_set;
         std::vector<std::string> m_includes; // directories of system headers
         std::map<std::string, std::string> m_defines; 
         std::string parse_cpp(std::string line);

         Input();
      public:
         static Input * instance();
         void set_input(std::string filename);
         const Pair getline();
         bool eof() const;
         const int line() const;
         const std::string file() const;
         void add_include(std::string include); 
         void add_define(std::string define, std::string value);
         bool is_system_header() const;
         bool is_header() const;
   };

}

#endif // __INPUT_H__