rename src/tgbaalgos/ as src/twaalgos/

Automatic mass renaming.

* src/tgbaalgos/: Rename as...
* src/twaalgos/: ... this.
* README, configure.ac, iface/ltsmin/modelcheck.cc, src/Makefile.am,
src/bin/autfilt.cc, src/bin/common_aoutput.cc,
src/bin/common_aoutput.hh, src/bin/common_output.hh,
src/bin/common_post.hh, src/bin/dstar2tgba.cc, src/bin/ltl2tgba.cc,
src/bin/ltl2tgta.cc, src/bin/ltlcross.cc, src/bin/ltldo.cc,
src/bin/ltlfilt.cc, src/bin/randaut.cc, src/dstarparse/dra2ba.cc,
src/dstarparse/nra2nba.cc, src/dstarparse/nsa2tgba.cc,
src/graphtest/twagraph.cc, src/kripke/kripkeprint.cc,
src/ltlvisit/contain.cc, src/ltlvisit/contain.hh,
src/ltlvisit/exclusive.cc, src/taalgos/emptinessta.hh,
src/tgbatest/checkpsl.cc, src/tgbatest/checkta.cc,
src/tgbatest/complementation.cc, src/tgbatest/emptchk.cc,
src/tgbatest/ltl2tgba.cc, src/tgbatest/ltlprod.cc,
src/tgbatest/randtgba.cc, src/tgbatest/taatgba.cc, src/twa/twa.cc,
src/twa/twagraph.hh, src/twa/twasafracomplement.cc,
wrap/python/spot_impl.i: Adjust.

src/twaalgos/safety.cc

@@ -0,0 +1,87 @@
+// -*- coding: utf-8 -*-
+// Copyright (C) 2010, 2011, 2013, 2014, 2015 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 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/>.
+
+#include "safety.hh"
+#include "misc/hash.hh"
+#include <deque>
+
+namespace spot
+{
+  bool
+  is_guarantee_automaton(const const_twa_graph_ptr& aut,
+			 const scc_info* si)
+  {
+    if (aut->acc().uses_fin_acceptance())
+      throw std::runtime_error
+	("is_guarantee_automaton() does not support Fin acceptance");
+
+    // Create an scc_info if the user did not give one to us.
+    bool need_si = !si;
+    if (need_si)
+      si = new scc_info(aut);
+
+    bool result = true;
+
+    for (auto& scc: *si)
+      {
+	if (scc.is_rejecting())
+	  continue;
+	// Non-rejecting SCCs should necessarily be accepting, because
+	// with only one self loop, there should be no ambiguity.
+	if (!scc.is_accepting())
+	  return false;
+	// Accepting SCCs should have only one state.
+	auto& st = scc.states();
+	if (st.size() != 1)
+	  {
+	    result = false;
+	    break;
+	  }
+	// The state should have only one transition that is a
+	// self-loop labelled by true.
+	auto src = st.front();
+	auto out = aut->out(src);
+	auto it = out.begin();
+	assert(it != out.end());
+	result =
+	  (it->cond == bddtrue) && (it->dst == src) && (++it == out.end());
+	if (!result)
+	  break;
+      }
+
+    if (need_si)
+      delete si;
+    return result;
+  }
+
+  bool is_safety_mwdba(const const_twa_graph_ptr& aut)
+  {
+    if (!(aut->acc().is_buchi() || aut->acc().is_true()))
+      throw std::runtime_error
+	("is_safety_mwdba() should be called on a Buchi automaton");
+
+    for (auto& t: aut->transitions())
+      if (!aut->acc().accepting(t.acc))
+	return false;
+    return true;
+  }
+
+
+
+}