maskkeep: Add a tgba_digraph version

* src/bin/autfilt.cc: Add option --keep-states.
* src/tgbaalgos/mask.cc, src/tgbaalgos/mask.hh: Keep the selected states
and update the initial state.
* src/tgbatest/Makefile.am: Adjust.
* src/tgbatest/maskkeep.test: New file.

src/tgbatest/Makefile.am

@@ -76,6 +76,7 @@ TESTS = \
   ltldo.test \
   ltldo2.test \
   maskacc.test \
+  maskkeep.test \
   simdet.test \
   sim2.test \
   ltl2tgba.test \

src/tgbatest/maskkeep.test

@@ -0,0 +1,113 @@
+#!/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
+
+cat >input1 <<EOF
+HOA: v1
+States: 4
+Start: 0
+AP: 2 "a" "b"
+acc-name: generalized-Buchi 2
+Acceptance: 2 Inf(0)&Inf(1)
+properties: trans-labels explicit-labels trans-acc
+--BODY--
+State: 0
+[0] 1 {0}
+[1] 2 {1}
+State: 1
+[0] 2
+[0] 3 {1}
+State: 2
+[1] 1
+[1] 3 {0}
+State: 3
+[0] 3 {0 1}
+--END--
+EOF
+
+cat >expect1 <<EOF
+HOA: v1
+States: 1
+Start: 0
+AP: 0
+acc-name: generalized-Buchi 2
+Acceptance: 2 Inf(0)&Inf(1)
+properties: trans-labels explicit-labels state-acc deterministic
+--BODY--
+State: 0
+--END--
+EOF
+
+run 0 ../../bin/autfilt --keep-states=0 input1 -H >output
+diff output expect1
+
+run 0 ../../bin/autfilt --keep-states=1 input1 -H >output
+diff output expect1
+
+cat >expect3 <<EOF
+HOA: v1
+States: 3
+Start: 0
+AP: 2 "a" "b"
+acc-name: generalized-Buchi 2
+Acceptance: 2 Inf(0)&Inf(1)
+properties: trans-labels explicit-labels trans-acc
+--BODY--
+State: 0
+[0] 1 {0}
+[1] 2 {1}
+State: 1
+[0] 2
+State: 2
+[1] 1
+--END--
+EOF
+
+cat >expect4 <<EOF
+HOA: v1
+States: 2
+Start: 0
+AP: 2 "a" "b"
+acc-name: generalized-Buchi 2
+Acceptance: 2 Inf(0)&Inf(1)
+properties: trans-labels explicit-labels state-acc deterministic
+--BODY--
+State: 0
+[0] 1
+State: 1
+[1] 0
+--END--
+EOF
+
+run 0 ../../bin/autfilt --keep-states=0,1,2 input1 -H >output
+diff output expect3
+run 0 ../../bin/autfilt --keep-states=0,9999,1,2 input1 -H >output
+diff output expect3
+
+run 0 ../../bin/autfilt --keep-states=1,2,0 input1 -H >output
+diff output expect4
+
+# Errors
+run 2 ../../bin/autfilt --keep-states=a3 input1
+run 2 ../../bin/autfilt --keep-states=3-2 input1