def test_disj_x_never():
x = variables("x")
goal = disj(same("olive", x), never)
s_inf = goal(Substitution())
assert next(s_inf) == Substitution({x: "olive"})
s_inf = assert_suspended(s_inf)
s_inf = assert_suspended(s_inf)
def test_disj():
x = variables("x")
goal = disj(same("olive", x), same("oil", x))
assert set(goal(Substitution())) == {
Substitution({x: "olive"}),
Substitution({x: "oil"})
}
def test_ifte_disj():
x, y = variables("x, y")
goal = ifte(disj(same(True, x), same(False, x)), same(False, y),
same(True, y))
assert list(goal(Substitution())) == [
Substitution({
x: True,
y: False
}),
Substitution({
x: False,
y: False
})
]
def test_reify_run_goal_inf():
x = variables("x")
goal = disj(same("olive", x), same("oil", x))
results = map(reify(x), run_goal(goal))
assert list(results) == ['olive', 'oil']
def test_reify_some():
x = variables("x")
goal = disj(same("olive", x), same("oil", x))
subs = take(5, goal(Substitution()))
results = map(reify(x), subs)
assert list(results) == ['olive', 'oil']
def teacupo(t):
return disj(same('tea', t), same('cup', t))
def listo(l):
return disj(nullo(l), fresh(lambda d: (cdro(l, d), listo(d))))