int_letter.hxx

// int_letter.hxx: this file is part of the Vaucanson project.
//
// Vaucanson, a generic library for finite state machines.
//
// Copyright (C) 2004, 2005, 2007, 2008 The Vaucanson Group.
//
// 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.
//
// The complete GNU General Public Licence Notice can be found as the
// `COPYING' file in the root directory.
//
// The Vaucanson Group consists of people listed in the `AUTHORS' file.
//
#ifndef VCSN_ALGEBRA_IMPLEMENTATION_LETTER_INT_LETTER_HXX
# define VCSN_ALGEBRA_IMPLEMENTATION_LETTER_INT_LETTER_HXX

# include <sstream>
# include <climits>

# include <vaucanson/algebra/implementation/letter/int_letter.hh>

namespace vcsn {

  namespace algebra {

    template <>
    struct letter_traits<int>
    {
      // This letter type needs more than one char to be displayed.
      typedef misc::false_t is_char_letter;

      enum
      {
        // Here we use UINT_MAX and not UINT_MAX + 1 because an enum cannot
        // hold UINT_MAX + 1.
        cardinal = UINT_MAX
      };

      // We can not "project" an int letter.
      typedef undefined_type first_projection_t;
      typedef undefined_type second_projection_t;

      LETTER_DEFAULT(open_par, "(")
      LETTER_DEFAULT(close_par, ")")
      LETTER_DEFAULT(plus, "+")
      LETTER_DEFAULT(times, ".")
      LETTER_DEFAULT(star, "*")
      LETTER_DEFAULT(epsilon, "e")
      LETTER_DEFAULT(zero, "z")
      LETTER_DEFAULT(open_weight, "{")
      LETTER_DEFAULT(close_weight, "}")
      LETTER_DEFAULT(space, " ")

      static
      int
      literal_to_letter(const std::string& str)
      {
        std::stringstream sstr(str);
        int ret;
        sstr >> ret;
        return ret;
      }

      static
      std::string
      letter_to_literal(const int& c)
      {
        std::stringstream sstr;
        sstr << c;
        return sstr.str();
      }

      // An int is "simple" with dimension 1.
      static std::string kind() { return "simple"; }
      static int dim() { return 1; }

    };

    template <typename S, typename CharContainer>
    bool op_parse(const algebra::FreeMonoidBase<S>& set,
                  std::basic_string<int>& v,
                  const std::string& s,
                  typename std::string::const_iterator& i,
                  const CharContainer&)
    {
      typename std::string::const_iterator j = i;
      typename std::string::const_iterator back;

      while (i != s.end()) {
        std::string out;
        back = i;

        while ((i != s.end()) && (((*i >= '0') && (*i <= '9')) || (*i == '#')))
          if (*i == '#') {
            ++i;
            break;
          }
          else {
            out += *i;
            ++i;
          }

        if (out.empty())
          break;

        int value;
        std::istringstream is(out);
        is >> value;

        if (!set.alphabet().contains(value)) {
          i = back;
          break ;
        }
        v.push_back(value);
      }
      return (i != j);
    }

  } // ! algebra

} // ! vcsn

namespace std {

  inline
  ostream& operator<<(ostream& o, basic_string<int> s)
  {
    basic_string<int>::const_iterator i;
    basic_string<int>::const_iterator j;

    for (i = s.begin(); i != s.end(); ) {
      o << *i;
      i++;
      if (i != s.end())
        o << "#";
    }

    return o;
  }

} // ! std

#endif // ! VCSN_ALGEBRA_IMPLEMENTATION_LETTER_INT_LETTER_HXX

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