def test__is_strictly_more_specific__3(self):
p = Program.parse("""
bird(X) <- chicken(X).
bird(X) <- penguin(X).
~flies(X) <- penguin(X).
chicken(tina).
penguin(tweety).
scared(tina).
flies(X) -< bird(X).
flies(X) -< chicken(X), scared(X).
nests_in_trees(X) -< flies(X).
~flies(X) -< chicken(X).
""")
i = Interpreter(p)
d1 = Derivation([
Rule.parse('flies(tina) -< chicken(tina), scared(tina).'),
Rule.parse('chicken(tina).'),
Rule.parse('scared(tina).'),
], i)
s1 = d1.get_structure()
d2 = Derivation([
Rule.parse('~flies(tina) -< chicken(tina).'),
Rule.parse('chicken(tina).'),
], i)
s2 = d2.get_structure()
result = s1.is_strictly_more_specific_than(s2)
assert_that(result).is_true()
def test__is_counter_argument_of__2(self):
p = Program.parse("""
bird(X) <- chicken(X).
bird(X) <- penguin(X).
~flies(X) <- penguin(X).
chicken(tina).
penguin(tweety).
scared(tina).
flies(X) -< bird(X).
flies(X) -< chicken(X), scared(X).
nests_in_trees(X) -< flies(X).
~flies(X) -< chicken(X).
""")
i = Interpreter(p)
d1 = Derivation([
Rule.parse('~flies(tina) -< chicken(tina).'),
Rule.parse('chicken(tina).'),
], i)
s1 = d1.get_structure()
d2 = Derivation([
Rule.parse('flies(tina) -< bird(tina).'),
Rule.parse('bird(tina) <- chicken(tina).'),
Rule.parse('chicken(tina).'),
], i)
s2 = d2.get_structure()
result = s2.is_counter_argument_of(s1, s1)
assert_that(result).is_true()
def test__get_structure__flies_tina_2__not_strict(self):
p = Program.parse("""
bird(X) <- chicken(X).
bird(X) <- penguin(X).
~flies(X) <- penguin(X).
chicken(tina).
penguin(tweety).
scared(tina).
flies(X) -< bird(X).
flies(X) -< chicken(X), scared(X).
nests_in_trees(X) -< flies(X).
~flies(X) -< chicken(X).
""")
i = Interpreter(p)
d = Derivation([
Rule.parse('flies(tina) -< chicken(tina), scared(tina).'),
Rule.parse('chicken(tina).'),
Rule.parse('scared(tina).'),
], i)
expected = Structure(
{Rule.parse('flies(tina) -< chicken(tina), scared(tina).')},
Literal.parse('flies(tina)'), d)
result = d.get_structure()
assert_that(result).is_equal_to(expected)
assert_that(result.is_strict()).is_false()