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

namespace vcsn {

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

    while ((i != s.end()) &&
           (std::find(escaped.begin(), escaped.end(), *i) == escaped.end())) {
      std::string out;
      back = i;

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

      int value;
      std::istringstream is(out);
      is >> value;
      if (!set.alphabet().contains(value)) {
        i = back;
        break ;
      }
      v.push_back(value);
    }
    return (i != j);
  }

} // vcsn

namespace std {

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