fairkripke.hh 3.58 KB
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// -*- coding: utf-8 -*-
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// Copyright (C) 2009, 2010, 2013, 2014, 2015 Laboratoire de Recherche et
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// Developpement de l'Epita
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//
// This file is part of Spot, a model checking library.
//
// Spot is free software; you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 3 of the License, or
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// (at your option) any later version.
//
// Spot 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
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// along with this program.  If not, see <http://www.gnu.org/licenses/>.
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#pragma once
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#include "tgba/tgba.hh"
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#include "fwd.hh"
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/// \addtogroup kripke Kripke Structures
/// \ingroup tgba

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namespace spot
{
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  /// \ingroup kripke
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  /// \brief Iterator code for a Fair Kripke structure.
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  ///
  /// This iterator can be used to simplify the writing
  /// of an iterator on a Fair Kripke structure (or lookalike).
  ///
  /// If you inherit from this iterator, you should only
  /// redefine
  ///
  ///   - fair_kripke_succ_iterator::first()
  ///   - fair_kripke_succ_iterator::next()
  ///   - fair_kripke_succ_iterator::done()
  ///   - fair_kripke_succ_iterator::current_state()
  ///
  /// This class implements fair_kripke_succ_iterator::current_condition(),
  /// and fair_kripke_succ_iterator::current_acceptance_conditions().
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  class SPOT_API fair_kripke_succ_iterator : public tgba_succ_iterator
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  {
  public:
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    /// \brief Constructor
    ///
    /// The \a cond and \a acc_cond arguments will be those returned
    /// by fair_kripke_succ_iterator::current_condition(),
    /// and fair_kripke_succ_iterator::current_acceptance_conditions().
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    fair_kripke_succ_iterator(const bdd& cond, acc_cond::mark_t acc_cond);
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    virtual ~fair_kripke_succ_iterator();

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    virtual bdd current_condition() const;
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    virtual acc_cond::mark_t current_acceptance_conditions() const;
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  protected:
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    bdd cond_;
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    acc_cond::mark_t acc_cond_;
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  };

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  /// \ingroup kripke
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  /// \brief Interface for a Fair Kripke structure.
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  ///
  /// A Kripke structure is a graph in which each node (=state) is
  /// labeled by a conjunction of atomic proposition, and a set of
  /// acceptance conditions.
  ///
  /// Such a structure can be seen as spot::tgba by pushing all labels
  /// to the outgoing transitions.
  ///
  /// A programmer that develops an instance of Fair Kripke structure
  /// needs just provide an implementation for the following methods:
  ///
  ///   - kripke::get_init_state()
  ///   - kripke::succ_iter()
  ///   - kripke::state_condition()
  ///   - kripke::state_acceptance_conditions()
  ///   - kripke::format_state()
  ///   - and optionally kripke::transition_annotation()
  ///
  /// The other methods of the tgba interface are supplied by this
  /// class and need not be defined.
  ///
  /// See also spot::fair_kripke_succ_iterator.
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  class SPOT_API fair_kripke: public twa
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  {
  public:
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    fair_kripke(const bdd_dict_ptr& d)
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      : twa(d)
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      {
      }

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    /// \brief The condition that label the state \a s.
    ///
    /// This should be a conjunction of atomic propositions.
    virtual bdd state_condition(const state* s) const = 0;

    /// \brief The set of acceptance conditions that label the state \a s.
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    virtual acc_cond::mark_t
      state_acceptance_conditions(const state* s) const = 0;
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  protected:
    virtual bdd compute_support_conditions(const state* s) const;
  };
}