autfilt: add a --sbacc option

... to force automata into state-based acceptance.

* src/tgbaalgos/sbacc.cc, src/tgbaalgos/sbacc.hh,
src/tgbatest/sbacc.test: New files.
* src/tgbaalgos/Makefile.am, src/tgbatest/Makefile.am: Add
them.
* src/tgba/tgbagraph.hh (copy_acceptance_conditions_of):
Call set_acceptance_conditions().
* src/bin/autfilt.cc: Add option --sbacc.

src/tgbaalgos/Makefile.am

@@ -64,6 +64,7 @@ tgbaalgos_HEADERS = \
   relabel.hh \
   replayrun.hh \
   safety.hh \
+  sbacc.hh \
   sccfilter.hh \
   scc.hh \
   sccinfo.hh \
@@ -115,6 +116,7 @@ libtgbaalgos_la_SOURCES = \
   replayrun.cc \
   relabel.cc \
   safety.cc \
+  sbacc.cc \
   scc.cc \
   sccinfo.cc \
   sccfilter.cc \

src/tgbaalgos/sbacc.cc

@@ -0,0 +1,79 @@
+// -*- coding: utf-8 -*-
+// Copyright (C) 2015 Laboratoire de Recherche et Développement
+// de l'Epita.
+//
+// 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 <vector>
+#include <map>
+#include <utility>
+#include "sbacc.hh"
+
+namespace spot
+{
+  tgba_digraph_ptr sbacc(tgba_digraph_ptr& old)
+  {
+    if (old->has_state_based_acc())
+      return old;
+
+    auto res = make_tgba_digraph(old->get_dict());
+    res->copy_ap_of(old);
+    res->copy_acceptance_conditions_of(old);
+
+    typedef std::pair<unsigned, acc_cond::mark_t> pair_t;
+    std::map<pair_t, unsigned> s2n;
+
+    std::vector<std::pair<pair_t, unsigned>> todo;
+
+    auto new_state =
+      [&](unsigned state, acc_cond::mark_t m) -> unsigned
+      {
+	pair_t x(state, m);
+	auto p = s2n.emplace(x, 0);
+	if (p.second)		// This is a new state
+	  {
+	    unsigned s = res->new_state();
+	    p.first->second = s;
+	    todo.emplace_back(x, s);
+	  }
+	return p.first->second;
+      };
+
+    // Find any transition going into the initial state, and use its
+    // acceptance as mark.
+    acc_cond::mark_t init_acc = 0U;
+    unsigned old_init = old->get_init_state_number();
+    for (auto& t: old->transitions())
+      if (t.dst == old_init)
+	{
+	  init_acc = t.acc;
+	  break;
+	}
+
+    res->set_init_state(new_state(old_init, init_acc));
+    while (!todo.empty())
+      {
+	auto one = todo.back();
+	todo.pop_back();
+	for (auto& t: old->out(one.first.first))
+	  res->new_transition(one.second,
+			      new_state(t.dst, t.acc),
+			      t.cond,
+			      one.first.second);
+      }
+    return res;
+  }
+}

src/tgbaalgos/sbacc.hh

@@ -0,0 +1,33 @@
+// -*- coding: utf-8 -*-
+// Copyright (C) 2015 Laboratoire de Recherche et Développement
+// de l'Epita.
+//
+// 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/>.
+
+#ifndef SPOT_TGBAALGOS_SBACC_HH
+# define SPOT_TGBAALGOS_SBACC_HH
+
+#include "tgba/tgbagraph.hh"
+
+namespace spot
+{
+  /// \brief Transform an automaton to use state-based acceptance
+  ///
+  /// This is independent on the acceptance condition used.
+  SPOT_API tgba_digraph_ptr sbacc(tgba_digraph_ptr& aut);
+}
+
+#endif // SPOT_TGBAALGOS_COMPLETE_HH