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* src/tgbaalgos/gtec/ce.cc (couvreur99_check_result::accepting_path):

Browse source 
Rewrite as ...
(couvreur99_check_result::accepting_cycle): ... this less complex
implementation.
(couvreur99_check_result::complete_cycle): Delete.
* src/tgbatest/emptchke.test: More explicit examples.
This commit is contained in:
Alexandre Duret-Lutz 2004-11-08 17:39:48 +00:00
parent 263afcd22a
commit 9d0bcae806
4 changed files with 154 additions and 207 deletions
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79
src/tgbatest/emptchke.test
View file

@ -25,6 +25,15 @@
set -e
expect_ce()
{
run 0 ./ltl2tgba -e -X "$1"
run 0 ./ltl2tgba -e -D -X "$1"
run 0 ./ltl2tgba -ecouvreur99_shy -X "$1"
run 0 ./ltl2tgba -ecouvreur99_shy -D -X "$1"
run 0 ./ltl2tgba -emagic_search -X "$1"
}
cat >input <<'EOF'
acc = c d;
s1, "s2", "a & !b", c d;
@ -32,6 +41,70 @@ s1, "s2", "a & !b", c d;
"state 3", s1,,;
EOF
run 0 ./ltl2tgba -e -X input
run 0 ./ltl2tgba -ecouvreur99_shy -X input
run 0 ./ltl2tgba -emagic_search -X input
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