#! /bin/sh
# -*- coding: utf-8 -*-
# Copyright (C) by the Spot authors, see the AUTHORS file for details.
#
# 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/>.


# Check for the stutter-invariant formula detection
. ./defs || exit 1

set -e

# Use time only if it is available
time=time
if ($time ls) >/dev/null 2>&1; then
    :
else
    time=
fi

FILE=formulae
rm -f $FILE
for i in 10 12 14 16 18 20; do
  randltl --seed 0   --tree-size $i a b c       -n 100 >> $FILE
  randltl --seed 100 --tree-size $i a b c d e f -n 100 >> $FILE
done

# We do not check i=0 and i=9, as they are too slow.
for i in 1 2 3 4 5 6 7 8; do
    SPOT_STUTTER_CHECK=$i
    export SPOT_STUTTER_CHECK
    $time ltlfilt --stutter-invariant -F $FILE > res.$i
done

# All results should be equal
for i in 2 3 4 5 6 7 8; do
    diff res.1 res.$i
done


# Do a similar test on fewer formulas, so we can cover 0 and 9.
cat >$FILE <<EOF
F(a & X(!a & b))
F(a & X(!a & Xb))
F(a & X!a & Xb)
F(a & X(a & Xb))
F(a & Xb)
Xa
EOF

# We do not check i=0 and i=9, as they are too slow.
for i in 0 1 2 3 4 5 6 7 8 9; do
    SPOT_STUTTER_CHECK=$i
    export SPOT_STUTTER_CHECK
    $time ltlfilt --stutter-invariant -F $FILE > res.$i
done

# All results should be equal
for i in 1 2 3 4 5 6 7 8 9; do
    diff res.0 res.$i
done