ltlfilt: add a --exclusive-ap option

* src/ltlvisit/exclusive.cc, src/ltlvisit/exclusive.hh: New files.
* src/ltlvisit/Makefile.am: Add them.
* src/bin/ltlfilt.cc: Implement the --exclusive-ap option.
* NEWS: Mention it.
* src/ltltest/exclusive.test: New file.
* src/ltltest/Makefile.am: Add it.

src/ltlvisit/exclusive.hh

@@ -0,0 +1,45 @@
+// -*- coding: utf-8 -*-
+// Copyright (C) 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/>.
+
+#pragma once
+
+#include <vector>
+#include "ltlast/atomic_prop.hh"
+#include "ltlast/formula.hh"
+
+namespace spot
+{
+  class SPOT_API exclusive_ap
+  {
+    std::vector<std::vector<const ltl::atomic_prop*>> groups;
+  public:
+    ~exclusive_ap();
+#ifndef SWIG
+    void add_group(std::vector<const ltl::atomic_prop*> ap);
+#endif
+    void add_group(const char* ap_csv);
+
+    bool empty() const
+    {
+      return groups.empty();
+    }
+
+    const ltl::formula* constrain(const ltl::formula* f) const;
+  };
+}