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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.
*/

#include <cstdlib>
#include <fstream>
#include <iostream>
#include <locale>
#include <stdexcept>
#include <astl/token.hpp>
#include "location.hpp"
#include "parser.hpp"
#include "scanner.hpp"
#include "yytname.hpp"

using namespace Astl;
using namespace AstlULMcalc;

int main(int argc, char** argv) {
   char* cmdname = *argv++; --argc;
   if (argc > 1) {
      std::cerr << "Usage: " << cmdname << " [filename]" << std::endl;
      exit(1);
   }

   std::unique_ptr<std::locale> locale = nullptr;
   try {
      locale = std::make_unique<std::locale>("");
   } catch (std::runtime_error&) {
      locale = nullptr;
   }

   Scanner* scanner = 0;
   std::ifstream* fin = 0;

   try {
      if (argc > 0) {
         char* fname = *argv++; --argc;
         fin = new std::ifstream(fname);
         std::string filename(fname);
         if (!*fin) {
            std::cerr << cmdname << ": unable to open " << fname <<
               " for reading" << std::endl;
            exit(1);
         }
         if (locale) fin->imbue(*locale);
         scanner = new Scanner(*fin, filename);
      } else {
         if (locale) std::cin.imbue(*locale);
         scanner = new Scanner(std::cin, "stdin");
      }
   } catch (Astl::Exception &e) {
       std::cerr << "from scanner: " << e.what() << std::endl; 
   }

   NodePtr root;
   try {
        parser p(*scanner, root);
        if (p.parse() == 0) {
            std::cout << root << std::endl;
        }
   } catch (Astl::Exception &e) {
       std::cerr << "from parser: " << e.what() << std::endl;
   }
   delete scanner;
}