// -*- coding: utf-8 -*-
// Copyright (C) 2012, 2013, 2014, 2015 Laboratoire de Recherche et
// Développement de l'Epita (LRDE).
// Copyright (C) 2004, 2005  Laboratoire d'Informatique de Paris 6 (LIP6),
// département Systèmes Répartis Coopératifs (SRC), Université Pierre
// et Marie Curie.
//
// 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
// the Free Software Foundation; either version 3 of the License, or
// (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
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

#pragma once

#include "ltlast/atomic_prop.hh"
#include <set>
#include <bddx.h>
#include "tgba/fwd.hh"

namespace spot
{
  namespace ltl
  {
    /// \addtogroup ltl_misc
    /// @{

    /// Set of atomic propositions.
    typedef std::set<const atomic_prop*,
		     formula_ptr_less_than> atomic_prop_set;

    /// \brief construct an atomic_prop_set with n propositions
    SPOT_API
    atomic_prop_set create_atomic_prop_set(unsigned n);

    /// \brief Destroy all the atomic propositions in an
    /// atomic_prop_set.
    SPOT_API void
    destroy_atomic_prop_set(atomic_prop_set& aprops);

    /// \brief Return the set of atomic propositions occurring in a formula.
    ///
    /// \param f the formula to inspect
    /// \param s an existing set to fill with atomic_propositions discovered,
    ///        or 0 if the set should be allocated by the function.
    /// \return A pointer to the supplied set, \c s, augmented with
    ///        atomic propositions occurring in \c f; or a newly allocated
    ///        set containing all these atomic propositions if \c s is 0.
    ///        The atomic propositions inserted into \a s are not cloned, so
    ///        they are only valid as long as \a f is.
    SPOT_API atomic_prop_set*
    atomic_prop_collect(const formula* f, atomic_prop_set* s = 0);

    /// \brief Return the set of atomic propositions occurring in a
    /// formula, as a BDD.
    ///
    /// \param f the formula to inspect
    /// \param a that automaton that should register the BDD variables used.
    /// \return A conjunction the atomic propositions.
    SPOT_API bdd
    atomic_prop_collect_as_bdd(const formula* f,
			       const const_twa_ptr& a);

    /// @}
  }
}