autfilt: implement --complement

* src/bin/autfilt.cc: Add option --complete.
* src/twaalgos/complete.cc: Better handling of 0-edge automata.
* src/tests/complement.test: New file.
* src/tests/Makefile.am: Add it.

NEWS

 New in spot 1.99.4a (not yet released)
 
+  Command-line tools:
+
+  * autfilt has gained a --complement option.
+    It currently work only for deterministic automata.
+
+  Library:
+
   * Rename dtgba_complement() as dtwa_complement(), rename the header
     as complement.hh, and restrict the purpose of this function to
     just complete the automaton and complement its acceptance

src/bin/autfilt.cc

@@ -55,6 +55,7 @@
 #include "twaalgos/remfin.hh"
 #include "twaalgos/cleanacc.hh"
 #include "twaalgos/dtgbasat.hh"
+#include "twaalgos/complement.hh"
 
 static const char argp_program_doc[] ="\
 Convert, transform, and filter Büchi automata.\v\
@@ -69,6 +70,7 @@ enum {
   OPT_ARE_ISOMORPHIC,
   OPT_CLEAN_ACC,
   OPT_CNF_ACC,
+  OPT_COMPLEMENT,
   OPT_COMPLEMENT_ACC,
   OPT_COUNT,
   OPT_DESTUT,
@@ -152,6 +154,9 @@ static const argp_option options[] =
       "rewrite the automaton without using Fin acceptance", 0 },
     { "cleanup-acceptance", OPT_CLEAN_ACC, nullptr, 0,
       "remove unused acceptance sets from the automaton", 0 },
+    { "complement", OPT_COMPLEMENT, nullptr, 0,
+      "complement each automaton (currently support only deterministic "
+      "automata)", 0 },
     { "complement-acceptance", OPT_COMPLEMENT_ACC, nullptr, 0,
       "complement the acceptance condition (without touching the automaton)",
       0 },
@@ -264,6 +269,7 @@ static bool opt_dnf_acc = false;
 static bool opt_cnf_acc = false;
 static bool opt_rem_fin = false;
 static bool opt_clean_acc = false;
+static bool opt_complement = false;
 static bool opt_complement_acc = false;
 static spot::acc_cond::mark_t opt_mask_acc = 0U;
 static std::vector<bool> opt_keep_states = {};
@@ -324,6 +330,9 @@ parse_opt(int key, char* arg, struct argp_state*)
       opt_dnf_acc = false;
       opt_cnf_acc = true;
       break;
+    case OPT_COMPLEMENT:
+      opt_complement = true;
+      break;
     case OPT_COMPLEMENT_ACC:
       opt_complement_acc = true;
       break;
@@ -537,6 +546,17 @@ namespace
       if (opt_complement_acc)
 	aut->set_acceptance(aut->acc().num_sets(),
 			    aut->get_acceptance().complement());
+      if (opt_complement)
+	{
+	  if (!spot::is_deterministic(aut))
+	    {
+	      std::cerr << filename << ':'
+			<< haut->loc << (": --complement currently supports "
+					 "only deterministic automata\n");
+	      exit(2);
+	    }
+	  aut = spot::dtwa_complement(aut);
+	}
       if (opt_rem_fin)
 	aut = remove_fin(aut);
       if (opt_dnf_acc)

src/tests/Makefile.am

@@ -174,6 +174,7 @@ TESTS_twa = \
   parseaut.test \
   optba.test \
   complete.test \
+  complement.test \
   remfin.test \
   dstar.test \
   readsave.test \

src/tests/complement.test

+#!/bin/sh
+# -*- 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/>.
+
+. ./defs
+
+set -e
+
+autfilt=../../bin/autfilt
+ltl2tgba=../../bin/ltl2tgba
+randaut=../../bin/randaut
+
+$randaut -H -A 'random 0..4' -Q1..10 -D -n 50 0..2 >aut
+run 0 $autfilt --complement -H aut >/dev/null
+
+cat >in <<EOF
+HOA: v1
+States: 0
+Acceptance: 0 t
+--BODY--
+--END--
+EOF
+$autfilt --complement -H in >out
+cat >expected <<EOF
+HOA: v1
+States: 1
+Start: 0
+AP: 0
+acc-name: all
+Acceptance: 0 t
+properties: trans-labels explicit-labels state-acc complete
+properties: deterministic
+--BODY--
+State: 0
+[t] 0
+--END--
+EOF
+diff out expected
+
+
+$ltl2tgba -H 'GFa & GFb' Xa | $autfilt --complement -H >out
+cat >expected <<EOF
+HOA: v1
+States: 1
+Start: 0
+AP: 2 "a" "b"
+acc-name: generalized-co-Buchi 2
+Acceptance: 2 Fin(0)|Fin(1)
+properties: trans-labels explicit-labels trans-acc complete
+properties: deterministic
+--BODY--
+State: 0
+[0&1] 0 {0 1}
+[!0&!1] 0
+[!0&1] 0 {1}
+[0&!1] 0 {0}
+--END--
+HOA: v1
+States: 4
+Start: 1
+AP: 1 "a"
+acc-name: co-Buchi
+Acceptance: 1 Fin(0)
+properties: trans-labels explicit-labels state-acc complete
+properties: deterministic
+--BODY--
+State: 0
+[0] 2
+[!0] 3
+State: 1
+[t] 0
+State: 2 {0}
+[t] 2
+State: 3
+[t] 3
+--END--
+EOF
+diff out expected
+
+
+$ltl2tgba -H 'FGa' | $autfilt --complement 2>out && exit 1
+grep 'deterministic' out

src/twaalgos/complete.cc

@@ -23,6 +23,11 @@ namespace spot
 {
   unsigned complete_here(twa_graph_ptr aut)
   {
+    // We do not use the initial state, but calling
+    // get_init_state_number() may create it and change the number of
+    // states.  This has to be done before calling aut->num_states().
+    unsigned init = aut->get_init_state_number();
+
     unsigned n = aut->num_states();
     unsigned sink = -1U;
 
@@ -69,6 +74,11 @@ namespace spot
 
     unsigned t = aut->num_edges();
 
+    // If the automaton is empty,
+    // pretend that state
+    if (t == 0)
+      sink = init;
+
     // Now complete all states (excluding any newly added the sink).
     for (unsigned i = 0; i < n; ++i)
       {