#!/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/>.

# Do some quick translations to make sure the neverclaims produced by
# spot actually look correct!  We do that by parsing them via ltlcross.
# ltl2neverclaim-lbtt.test does the same with LBTT if it is installed.

. ./defs
set -e

# Skip this test if ltl2dstar is not installed.
(ltl2dstar --version) || exit 77

# Make sure all recurrence formulas are translated into deterministic
# Büchi automata by the DRA->TGBA converter.
# (Note that ltl2tgba is not called with -D when want to make
# sure we get a deterministic output even if the automaton generated
# by Spot initially was non-deterministic)

randltl -n -1 a b --tree-size=5..15 |
ltlfilt --syntactic-recurrence --remove-wm -r -u \
         --size-min=4 --size-max=15 --relabel=abc |
head -n 20 > formulas

randltl -n -1 a b --tree-size=5..15 |
ltlfilt -v --obligation |
ltlfilt --syntactic-recurrence --remove-wm -r -u --size=4..15 --relabel=abc |
head -n 20 >> formulas

while read f; do
  ltlfilt -f "$f" -l |
  ltl2dstar --ltl2nba=spin:ltl2tgba@-s - foo
  echo "$f"
  det=`dstar2tgba foo --stats '%d'`
  test $det -eq 1;
done < formulas

echo ==========================

# For obligation formulas, the output of dstar2tgba should
# have the same size as the input when option -D is used.
randltl -n -1 a b --tree-size=5..15 |
ltlfilt --obligation --size=4..15 --relabel=abc --remove-wm -r -u |
head -n 20 > formulas

while read f; do
  expected=`ltl2tgba "$f" -BD --stats '%s %e 1 %d'`
  ltlfilt -f "$f" -l |
  ltl2dstar --ltl2nba=spin:ltl2tgba@-Ds - foo
  echo "$f"
  output=`dstar2tgba foo -BD --stats '%s %e %d 1'`
  # the '1 %d' matching '%d 1' makes sure input and output are deterministic.
  test "$output" = "$expected";
done < formulas

echo ==========================

# Now make sure that some obviously non-deterministic property
# are not translated to deterministic.

cat >formulas <<EOF
FGa
GFa->GFb
GFa & FGb
FGa | FGb
FGa & FGb
EOF

while read f; do
  ltlfilt -f "$f" -l |
  ltl2dstar --ltl2nba=spin:ltl2tgba@-s - foo
  echo "$f"
  det=`dstar2tgba foo --stats '%d'`
  test $det -eq 0;
done < formulas