autfilt: --instut, --destut, --is-empty

* src/bin/autfilt.cc: Add these new options.
* src/tgbaalgos/stutterize.cc, src/tgbaalgos/stutterize.hh: Make it
possible to call sl() and sl2() without passing the set of atomic
propositions.
* src/tgbatest/stutter.test: New file.
* src/tgbatest/Makefile.am: Add it.

src/tgbatest/stutter.test

@@ -0,0 +1,38 @@
+#! /bin/sh
+# -*- coding: utf-8 -*-
+# Copyright (C) 2014 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/>.
+
+. ./defs || exit 1
+
+set -e
+
+ltl2tgba=../../bin/ltl2tgba
+autfilt=../../bin/autfilt
+
+$ltl2tgba '!FG(a | Xa | G!a)' -H | $autfilt -H --destut > pos.hoa
+$ltl2tgba 'FG(a | Xa | G!a)' -H | $autfilt -H --destut > neg.hoa
+$autfilt pos.hoa --product neg.hoa -H > prod.hoa
+$autfilt --is-empty prod.hoa -q && exit 1
+$autfilt --states=10 prod.hoa -q
+
+$ltl2tgba '!FG(a | Xa | G!a)' -H | $autfilt -H --instut > pos.hoa
+$ltl2tgba 'FG(a | Xa | G!a)' -H | $autfilt -H --instut > neg.hoa
+$autfilt pos.hoa --product neg.hoa -H > prod.hoa
+$autfilt --is-empty prod.hoa -q && exit 1
+$autfilt --states=12 prod.hoa -q