Create the direct simulation.

* src/tgbaalgos/simulation.cc, src/tgbaalgos/simulation.hh: New files.
* src/tgbaalgos/Makefile.am: Add the new files to the compilation.
* src/tgbatest/spotlbtt.test: Add the simulation.
* src/tgbatest/ltl2tgba.cc: Add direct simulation (-RSD).

src/tgbaalgos/simulation.hh

@@ -0,0 +1,67 @@
+// -*- coding: utf-8 -*-
+// Copyright (C) 2012 Laboratoire de Recherche et Développement
+// de l'Epita (LRDE).
+//
+// 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 2 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 Spot; see the file COPYING.  If not, write to the Free
+// Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+// 02111-1307, USA.
+
+#ifndef SPOT_TGBAALGOS_SIMULATION_HH
+# define SPOT_TGBAALGOS_SIMULATION_HH
+
+
+namespace spot
+{
+  class tgba;
+
+  /// \addtogroup tgba_reduction
+  /// @{
+
+  /// \brief Tries to reduce the automaton by merging states whose
+  /// recognizes similar language.
+  ///
+  /// When the language recognized by one state is included in the
+  /// language recognized by an another one, the first one is merged
+  /// with the second. The algorithm is based on the following
+  /// paper:
+  ///
+  /// \verbatim
+  ///     @InProceedings{ etessami.00.concur,
+  ///   author        = {Kousha Etessami and Gerard J. Holzmann},
+  ///   title         = {Optimizing {B\"u}chi Automata},
+  ///   booktitle     = {Proceedings of the 11th International Conference on
+  ///     	      Concurrency Theory (Concur'00)},
+  ///   pages         = {153--167},
+  ///   year          = {2000},
+  ///   editor        = {C. Palamidessi},
+  ///   volume        = {1877},
+  ///   series        = {Lecture Notes in Computer Science},
+  ///   address       = {Pennsylvania, USA},
+  ///   publisher     = {Springer-Verlag}
+  /// }
+  /// \endverbatim
+  ///
+  /// \param automaton The automaton to simulate.
+  /// \return a new automaton which is at worst a copy of the received
+  /// one.
+  tgba* simulation(const tgba* automaton);
+
+  /// @}
+} // End namespace spot.
+
+
+
+#endif // !SPOT_TGBAALGOS_SIMULATION_HH