def __init__(self, head, body):
self.__head = head
self.__body = body
# relations between variables like < <= = !=
# also for relations between variables and constants
# self.__var_rels = {}
# a list (body_index1,pos1,body_index2,pos2,comparison operator)
self.__var_constraints = []
# explicitly add all equality constraints between variables
for bi1, b1 in enumerate(self.__body):
positions1 = PositionIndex.get_all_positions(b1)
for p1 in positions1:
v1 = p1.fetch(b1)
if isinstance(v1, Variable):
# can't use enumerate here, have to preserve correct indexing
# for bi2
for bi2, b2 in zip(range(bi1, len(self.__body)), self.__body[bi1:]):
positions2 = PositionIndex.get_all_positions(b2)
for p2 in positions2:
v2 = p2.fetch(b2)
if isinstance(v2, Variable):
if (p1 != p2 or bi1 != bi2) and v1 == v2:
self.__var_constraints.append((bi1, p1, bi2, p2, Comparison('==')))
# a mapping head_pos -> [(body_index, body_pos)]
self.__headvar_bindings = {}
hpositions = PositionIndex.get_all_positions(head)
for hp in hpositions:
hv = hp.fetch(head)
if not isinstance(hv, Variable):
continue
bound = False
for bi, b in enumerate(self.__body):
bpositions = PositionIndex.get_all_positions(b)
for bp in bpositions:
bv = bp.fetch(b)
if isinstance(bv, Variable):
if (hv == bv):
self.__headvar_bindings.setdefault(hp, []).append((bi, bp))
bound = True
#assert bound, "Head variable %s not bound to any body variables" % hv
if not bound:
print >> sys.stderr, "Head variable %s not bound to any body variables" % hv
# equality constraints on head
self.__headvar_constraints = []
for i, p1 in enumerate(hpositions):
t1 = p1.fetch(head)
if isinstance(t1, Variable):
for p2 in hpositions[i+1:]:
t2 = p2.fetch(head)
if t1 == t2:
self.__headvar_constraints.append((p1, p2))
CacheHash.__init__(self)
def __init__(self, terms): self.__terms = terms CacheHash.__init__(self)
def __init__(self, head, body):
self.__head = head
self.__body = body
# relations between variables like < <= = !=
# also for relations between variables and constants
# self.__var_rels = {}
# a list (body_index1,pos1,body_index2,pos2,comparison operator)
self.__var_constraints = []
# explicitly add all equality constraints between variables
for bi1, b1 in enumerate(self.__body):
positions1 = PositionIndex.get_all_positions(b1)
for p1 in positions1:
v1 = p1.fetch(b1)
if isinstance(v1, Variable):
# can't use enumerate here, have to preserve correct indexing
# for bi2
for bi2, b2 in zip(range(bi1, len(self.__body)),
self.__body[bi1:]):
positions2 = PositionIndex.get_all_positions(b2)
for p2 in positions2:
v2 = p2.fetch(b2)
if isinstance(v2, Variable):
if (p1 != p2 or bi1 != bi2) and v1 == v2:
self.__var_constraints.append(
(bi1, p1, bi2, p2, Comparison('==')))
# a mapping head_pos -> [(body_index, body_pos)]
self.__headvar_bindings = {}
hpositions = PositionIndex.get_all_positions(head)
for hp in hpositions:
hv = hp.fetch(head)
if not isinstance(hv, Variable):
continue
bound = False
for bi, b in enumerate(self.__body):
bpositions = PositionIndex.get_all_positions(b)
for bp in bpositions:
bv = bp.fetch(b)
if isinstance(bv, Variable):
if (hv == bv):
self.__headvar_bindings.setdefault(hp, []).append(
(bi, bp))
bound = True
#assert bound, "Head variable %s not bound to any body variables" % hv
if not bound:
print >> sys.stderr, "Head variable %s not bound to any body variables" % hv
# equality constraints on head
self.__headvar_constraints = []
for i, p1 in enumerate(hpositions):
t1 = p1.fetch(head)
if isinstance(t1, Variable):
for p2 in hpositions[i + 1:]:
t2 = p2.fetch(head)
if t1 == t2:
self.__headvar_constraints.append((p1, p2))
CacheHash.__init__(self)
def __init__(self, terms):
self.__terms = terms
CacheHash.__init__(self)
def __init__(self, index): self.__index = tuple(index) CacheHash.__init__(self)
def __init__(self, index):
self.__index = tuple(index)
CacheHash.__init__(self)