def test_unify_terms3(self):
t1 = ('term', 'teacher', [('term', 'sokrates', []),
('term', 'plato', [])])
t2 = ('term', 'teacher', [('var', 'X'), ('var', 'Y')])
exp = {'X': ('term', 'sokrates', []), 'Y': ('term', 'plato', [])}
act = unify(t1, t2, {})
self.assertEqual(act, exp)
def test_unifyc_rhea(self):
t1 = ('term', 'parent', [('var', 'Y'), ('var', 'Z')])
t2 = ('term', 'parent', [('term', 'zeus', []), ('term', 'rhea', [])])
mgu = {
# 'X': ('term', 'zeus', []),
'Y': ('term', 'chronos', [])
}
exp = None
act = unify(t1, t2, mgu)
self.assertEqual(act, exp)
def _solve(db, qry, mgu, indent):
for hd, tl in db:
# Copy original MGU. For each fact or rule in the DB start with
# the same MGU.
mguc = deepcopy(mgu)
# Unify the head. If it is a fact, we are done at this point.
mguc = unify(hd, qry, mguc)
# If unification failed, continue with the next fact or rule.
if mguc is None:
# print(' ' * indent, 'FAIL ', prettify_rule(hd, tl))
continue
yield from _solve_conjuction(db, tl, mguc, indent + 2)
def test_unify_fail_terms1(self):
t1 = ('term', 'sokrates', [])
t2 = ('term', 'plato', [])
exp = None
act = unify(t1, t2, {})
self.assertEqual(act, exp)
def test_unify_same_vars(self):
t1 = ('var', 'X')
t2 = ('var', 'X')
exp = {}
act = unify(t1, t2, {})
self.assertEqual(act, exp)
def test_unify_terms2(self):
t1 = ('term', 'human', [('term', 'sokrates', [])])
t2 = ('term', 'human', [('var', 'X')])
exp = {'X': ('term', 'sokrates', [])}
act = unify(t1, t2, {})
self.assertEqual(act, exp)
def test_unify_terms0(self):
t1 = ('term', 'sokrates', [])
t2 = ('term', 'sokrates', [])
exp = {}
act = unify(t1, t2, {})
self.assertEqual(act, exp)
def test_unify_different_vars2(self):
t1 = ('var', 'Y')
t2 = ('var', 'X')
exp = {'X': ('var', 'Y')}
act = unify(t1, t2, {})
self.assertEqual(act, exp)