#!/bin/sh
# Copyright (C) 2009, 2010 Laboratoire de Recherche et Développement
# de l'Epita (LRDE).
# Copyright (C) 2003, 2004, 2005 Laboratoire d'Informatique de
# Paris 6 (LIP6), département Systèmes Répartis Coopératifs (SRC),
# Université Pierre et Marie Curie.
#
# 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 2 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 Spot; see the file COPYING.  If not, write to the Free
# Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
# 02111-1307, USA.


. ./defs

set -e

expect_ce()
{
  run 0 ../ltl2tgba -e -X "$1"
  run 0 ../ltl2tgba -e -D -X "$1"
  run 0 ../ltl2tgba -e'Cou99(shy)' -X "$1"
  run 0 ../ltl2tgba -e'Cou99(shy)' -D -X "$1"
  run 0 ../ltl2tgba -eCVWY90 -X "$1"
  run 0 ../ltl2tgba -eGV04 -X "$1"
  run 0 ../ltl2tgba -eSE05 -X "$1"
  run 0 ../ltl2tgba -eTau03 -X "$1"
}

cat >input <<'EOF'
acc = c d;
s1, "s2", "a & !b", c d;
"s2", "state 3", "a", c;
"state 3", s1,,;
EOF

expect_ce input

#       ________
#      /        v
#    >a--->d--->g
#    /^   /^   /^
#   L |  L |  L |{A}
#  b->c e->f h->i
#
cat >input <<'EOF'
acc = A;
a, b, "1",;
b, c, "1",;
c, a, "1",;
a, d, "1",;
d, e, "1",;
e, f, "1",;
f, d, "1",;
d, g, "1",;
g, h, "1",;
h, i, "1",;
i, g, "1", A;
a, g, "1",;
EOF

expect_ce input

#        v
#     d->a
#     ^  |
#     |  v
#     c<-b<-.
#     ^  |A |B
#    B|  v  |
#     `--e->f
#
# The arcs are ordered so that Couvreur99 succeed after exploring
# the following subgraph (which is one accepting SCC):
#
#        v
#     d->a
#     ^  |
#     |  v
#     c<-b<-.
#        |A |B
#        v  |
#        e->f
#
# However when computing a counter-example the greedy BFS algorithm
# will fail to return the minimal a->b->e->f->b run.  Indeed it first
# walks through a->b->e (which gives acceptance condition A), and
# prefer to continue with e->c (because it gives acceptance condition B),
# and finally closes the cycle with c->d->a
#
cat >input <<'EOF'
acc = A B;
a, b, "1",;
b, c, "1",;
c, d, "1",;
d, a, "1",;
b, e, "1", A;
e, f, "1",;
f, b, "1", B;
e, c, "1", B;
EOF

expect_ce input


# This graph was randomly generated, and contains one accepting path.
# It triggered a bug in our implementation of GV04 (that didn't see any
# accepting path).
cat >input <<EOF
acc = "a0";
"S0", "S12", "1",;
"S12", "S17", "1",;
"S12", "S8", "1",;
"S17", "S6", "1",;
"S17", "S9", "1", "a0";
"S17", "S2", "1",;
"S8", "S14", "1",;
"S8", "S2", "1",;
"S6", "S1", "1",;
"S9", "S18", "1",;
"S2", "S17", "1",;
"S14", "S19", "1",;
"S14", "S10", "1",;
"S1", "S15", "1",;
"S18", "S5", "1",;
"S19", "S5", "1",;
"S19", "S7", "1",;
"S19", "S11", "1",;
"S10", "S17", "1",;
"S15", "S8", "1",;
"S5", "S4", "1",;
"S11", "S6", "1",;
"S4", "S13", "1",;
"S13", "S3", "1",;
"S3", "S16", "1",;
"S3", "S19", "1",;
EOF

expect_ce input