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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 std;
using namespace Astl;
using namespace AstlULMcalc;

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

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

    try {
        Scanner* scanner;
        ifstream* fin = 0;
        if (argc > 0) {
            char* fname = *argv++; --argc;
            fin = new ifstream(fname);
            string filename(fname);
            if (!*fin) {
                cerr << cmdname << ": unable to open " << fname <<
                    " for reading" << endl;
                exit(1);
            }
            if (locale) {
                fin->imbue(*locale);
            }
            scanner = new Scanner(*fin, filename);
        } else {
            if (locale) {
                std::cin.imbue(*locale);
            }
            scanner = new Scanner(cin, "stdin");
        }
        AstlULMcalc::location loc;
        semantic_type yylval;
        int token;
        while ((token = scanner->get_token(yylval, loc)) != 0) {
            cout << yytname[token - 255];
            if (yylval) {
                cout << " \"" << yylval->get_token().get_text() << '"';
                yylval = NodePtr(nullptr);
            }
            cout << " at " << make_loc(loc);
            cout << endl;
        }
        delete scanner;
        if (fin) {
            delete fin;
        }
    }
    catch (Astl::Exception &e) {
       std::cerr << "lexer: " << e.what() << std::endl; 
    }
}