# -*- mode: python; coding: utf-8 -*-
# Copyright (C) 2012 Laboratoire de Recherche et Développement
# de l'EPITA.
#
# 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/>.

import sys
from buddy import *

bdd_init(10000, 10000)
bdd_setvarnum(5)

V = [bdd_ithvar(i) for i in range(5)]

a =  V[0] & V[1] & -V[2]
b =  V[0] & V[1] & -V[2] & -V[3]
c = -V[0] & V[1] & -V[2] & -V[3]
d =         V[1] & -V[2]
e =         V[1] &  V[2] & -V[3] & V[4]
f =  V[0]                & -V[3] & V[4]
g = -V[0] | V[1]

assert(bdd_implies(b,a))
assert(not bdd_implies(a,b))
assert(not bdd_implies(c,a))
assert(bdd_implies(a,d))
assert(bdd_implies(b,d))
assert(bdd_implies(c,d))
assert(bdd_implies(d,d))
assert(not bdd_implies(e,d))
assert(not bdd_implies(d,e))
assert(not bdd_implies(f,e))
assert(not bdd_implies(e,f))
assert(bdd_implies(bddfalse,f))
assert(not bdd_implies(bddtrue,f))
assert(bdd_implies(f,bddtrue))
assert(not bdd_implies(f,bddfalse))
assert(bdd_implies(a,g))

a = (-V[2] & (-V[1] | V[0])) | (-V[0] & V[1] & V[2])
b = V[1] | -V[2]
assert(bdd_implies(a,b))

# Cleanup all BDD variables before calling bdd_done(), otherwise
# bdd_delref will be called after bdd_done() and this is unsafe in
# optimized builds.
V = a = b = c = d = e = f = g = 0;
bdd_done()