add_epsilon_trans.hh

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// This file is part of Awali.
// Copyright 2016-2021 Sylvain Lombardy, Victor Marsault, Jacques Sakarovitch
//
// Awali is a 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 3 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, see <http://www.gnu.org/licenses/>.
 
#ifndef AWALI_MISC_ADD_EPSILON_TRANS_HH
#define AWALI_MISC_ADD_EPSILON_TRANS_HH
 
namespace awali {
  namespace sttc {
    namespace internal {
      //If epsilon transitions are not allowed
 
      template<bool HAS_ONE>
      struct if_has_one {
 
        template<typename Aut>
        static inline
        auto
        new_epsilon_trans(Aut a,
                          state_t src, state_t dst,
                          ::awali::sttc::weight_t_of<Aut> w)
          -> transition_t
        {
          throw std::runtime_error("No epsilon transition");
        }
 
        template<typename Aut>
        static inline
        auto
        set_epsilon_trans(Aut a,
                          state_t src, state_t dst,
                          ::awali::sttc::weight_t_of<Aut> w)
          -> transition_t
        {
          throw std::runtime_error("No epsilon transition");
        }
 
        template<typename Aut>
        static inline
        auto
        add_epsilon_trans(Aut a,
                          state_t src, state_t dst,
                          ::awali::sttc::weight_t_of<Aut> w)
          -> ::awali::sttc::weight_t_of<Aut>
        {
          throw std::runtime_error("No epsilon transition");
        }
 
        template<typename Labelset>
        static inline
        typename Labelset::value_t
        get_epsilon() {
          throw std::runtime_error("No epsilon in labelset");
        }
 
        template<typename Labelset>
        static inline
        bool
        is_epsilon(const typename Labelset::value_t& l) {
          return false;
        }
 
        template<typename Aut>
        static inline
        void
        del_epsilon_trans(Aut a,
                          state_t src, state_t dst)
        {
          throw std::runtime_error("No epsilon transition");
        }
      };
 
 
      //If epsilon transitions are allowed
 
 
      template<>
      struct if_has_one<true> {
 
        template<typename Aut>
        static inline
        auto
        new_epsilon_trans(Aut a,
                          state_t src, state_t dst,
                          ::awali::sttc::weight_t_of<Aut> w)
          -> transition_t
        {
          return a->new_transition(src, dst, a->context().labelset()->one(),w);
        }
 
        template<typename Aut>
        static inline
        auto
        set_epsilon_trans(Aut a,
                          state_t src, state_t dst,
                          ::awali::sttc::weight_t_of<Aut> w)
          -> transition_t
        {
          return a->set_transition(src, dst, a->context().labelset()->one(),w);
        }
 
        template<typename Aut>
        static inline
        auto
        add_epsilon_trans(Aut a,
                          state_t src, state_t dst,
                          ::awali::sttc::weight_t_of<Aut> w)
          -> ::awali::sttc::weight_t_of<Aut>
        {
          return a->add_transition(src, dst, a->context().labelset()->one(),w);
        }
 
        template<typename Aut>
        static inline
        void
        del_epsilon_trans(Aut a,
                          state_t src, state_t dst)
        {
          a->del_transition(src, dst, a->context().labelset()->one());
        }
 
        template<typename Labelset>
        static inline
        typename Labelset::value_t
        get_epsilon() {
          return Labelset::one();
        }
 
        template<typename Labelset>
        static inline
        bool
        is_epsilon(const typename Labelset::value_t& l) {
          return Labelset::is_one(l);
        }
 
      };
    }
 
    template <typename Aut>
    inline
    transition_t
    new_epsilon_trans(Aut a, state_t src, state_t dst, weight_t_of<Aut> w) {
      return internal::if_has_one<labelset_t_of<Aut>::has_one()>::new_epsilon_trans(a, src, dst, w);
    }
 
    template <typename Aut>
    inline
    transition_t
    set_epsilon_trans(Aut a, state_t src, state_t dst, weight_t_of<Aut> w) {
      return internal::if_has_one<labelset_t_of<Aut>::has_one()>::set_epsilon_trans(a, src, dst, w);
    }
 
    template <typename Aut>
    inline
    weight_t_of<Aut>
    add_epsilon_trans(Aut a, state_t src, state_t dst, weight_t_of<Aut> w) {
      return internal::if_has_one<labelset_t_of<Aut>::has_one()>::add_epsilon_trans(a, src, dst, w);
    }
 
    template <typename Aut>
    inline
    void
    del_epsilon_trans(Aut a, state_t src, state_t dst) {
      return internal::if_has_one<labelset_t_of<Aut>::has_one()>::del_epsilon_trans(a, src, dst);
    }
 
    //Without weight
 
    template <typename Aut>
    transition_t
    new_epsilon_trans(const Aut a, state_t src, state_t dst) {
      return internal::if_has_one<labelset_t_of<Aut>::has_one()>::new_epsilon_trans(a, src, dst, a->context().weightset()->one());
    }
 
    template <typename Aut>
    inline
    weight_t_of<Aut>
    add_epsilon_trans(const Aut a, state_t src, state_t dst) {
      return internal::if_has_one<labelset_t_of<Aut>::has_one()>::add_epsilon_trans(a, src, dst, a->context().weightset()->one());
 
    }
 
    template <typename Aut>
    inline
    transition_t
    set_epsilon_trans(const Aut a, state_t src, state_t dst) {
      return internal::if_has_one<labelset_t_of<Aut>::has_one()>::set_epsilon_trans(a, src, dst, a->context().weightset()->one());
    }
    /*
      template <typename Aut>
      inline
      label_t_of<Aut>
      get_epsilon(const Aut a) {
      return if_has_one<labelset_t_of<Aut>::has_one()>::template get_epsilon<labelset_t_of<Aut>>();
      }
    */
 
    template <typename Labelset>
    inline
    typename Labelset::value_t
    get_epsilon() {
      return internal::if_has_one<Labelset::has_one()>::template get_epsilon<Labelset>();
    }
 
    template <typename Labelset>
    inline
    bool
    is_epsilon(const typename Labelset::value_t& l) {
      return internal::if_has_one<Labelset::has_one()>::template is_epsilon<Labelset>(l);
    }
 
  }
}//end of ns awali::stc
 
#endif