def _var_to_swipy_ref(var: Variable, swipy_ref, lit_var_store: Dict[Variable,
int]):
if var in lit_var_store:
swipy.swipy_put_term(swipy_ref, lit_var_store[var])
else:
swipy.swipy_put_variable(swipy_ref)
lit_var_store[var] = swipy_ref
def _var_to_swipy(var: Variable, lit_var_store: Dict[Variable, int]):
if var in lit_var_store:
return lit_var_store[var]
else:
tmpV = swipy.swipy_new_term_ref()
swipy.swipy_put_variable(tmpV)
lit_var_store[var] = tmpV
return tmpV
def query(self, *query, **kwargs):
if 'max_solutions' in kwargs:
max_solutions = kwargs['max_solutions']
else:
max_solutions = -1
vars_of_interest = [[y for y in x.get_arguments() if isinstance(y, Variable)] for x in query]
vars_of_interest = reduce(lambda x, y: x + y, vars_of_interest, [])
vars_of_interest = reduce(lambda x, y: x + [y] if y not in x else x, vars_of_interest, [])
var_store = {}
for v in vars_of_interest:
tmp_v = swipy.swipy_new_term_ref()
swipy.swipy_put_variable(tmp_v)
var_store[v] = tmp_v
if len(query) == 1:
query = query[0]
predicate_name = query.get_predicate().get_name()
query_args = swipy.swipy_new_term_refs(query.get_predicate().get_arity())
for ind, arg in enumerate(query.get_arguments()):
_to_swipy_ref(arg, query_args + ind, var_store)
pred = swipy.swipy_predicate(predicate_name, query.get_predicate().get_arity(), None)
query = swipy.swipy_open_query(pred, query_args)
else:
swipy_objs = [_lit_to_swipy(x, var_store) if isinstance(x, Atom) else _neg_to_swipy(x, var_store) for x
in query]
first = swipy_objs[0]
rest = _conjoin_literals(swipy_objs[1:])
compound_arg = swipy.swipy_new_term_refs(2)
swipy.swipy_put_term(compound_arg, first)
swipy.swipy_put_term(compound_arg + 1, rest)
predicate = swipy.swipy_predicate(",", 2, None)
query = swipy.swipy_open_query(predicate, compound_arg)
r = swipy.swipy_next_solution(query)
all_solutions = []
var_index_var = dict([(var_store[v], v) for v in var_store])
while r and max_solutions != 0:
max_solutions -= 1
tmp_solution = {}
for var in var_store:
tmp_solution[var] = _read_swipy(var_store[var], swipy_term_to_var=var_index_var)
all_solutions.append(tmp_solution)
r = swipy.swipy_next_solution(query)
swipy.swipy_close_query(query)
return all_solutions
def query(self, *query, **kwargs):
if 'max_solutions' in kwargs:
max_solutions = kwargs['max_solutions']
else:
max_solutions = -1
if 'time_limit' in kwargs:
time_limit = kwargs['time_limit']
else:
time_limit = None
if 'depth_limit' in kwargs:
depth_limit = kwargs['depth_limit']
else:
depth_limit = None
if 'inference_limit' in kwargs:
inference_limit = kwargs['inference_limit']
else:
inference_limit = None
vars_of_interest = [[y for y in x.get_arguments() if isinstance(y, Variable)] for x in query]
vars_of_interest = reduce(lambda x, y: x + y, vars_of_interest, [])
vars_of_interest = reduce(lambda x, y: x + [y] if y not in x else x, vars_of_interest, [])
var_store = {}
for v in vars_of_interest:
tmp_v = swipy.swipy_new_term_ref()
swipy.swipy_put_variable(tmp_v)
var_store[v] = tmp_v
# if len(query) == 1:
# query = query[0]
# predicate_name = query.get_predicate().get_name()
# query_args = swipy.swipy_new_term_refs(query.get_predicate().get_arity())
#
# for ind, arg in enumerate(query.get_arguments()):
# _to_swipy_ref(arg, query_args + ind, var_store)
#
# pred = swipy.swipy_predicate(predicate_name, query.get_predicate().get_arity(), None)
# query = swipy.swipy_open_query(pred, query_args)
# else:
# swipy_objs = [_lit_to_swipy(x, var_store) if isinstance(x, Atom) else _neg_to_swipy(x, var_store) for x
# in query]
# first = swipy_objs[0]
# rest = _conjoin_literals(swipy_objs[1:])
#
# compound_arg = swipy.swipy_new_term_refs(2)
# swipy.swipy_put_term(compound_arg, first)
# swipy.swipy_put_term(compound_arg + 1, rest)
#
# predicate = swipy.swipy_predicate(",", 2, None)
# query = swipy.swipy_open_query(predicate, compound_arg)
pred, compound_arg = self._prepare_query(var_store, *query, max_time=time_limit, max_depth=inference_limit, max_inference=inference_limit)
query = swipy.swipy_open_query(pred, compound_arg)
r = swipy.swipy_next_solution(query)
all_solutions = []
var_index_var = dict([(var_store[v], v) for v in var_store])
while r and max_solutions != 0:
max_solutions -= 1
tmp_solution = {}
for var in var_store:
tmp_solution[var] = _read_swipy(var_store[var], swipy_term_to_var=var_index_var)
all_solutions.append(tmp_solution)
r = swipy.swipy_next_solution(query)
swipy.swipy_close_query(query)
return all_solutions
def _prepare_query(self, var_store, *query, max_time=None, max_depth=None, max_inference=None):
"""
Prepares the query
Return swipl-transformed predicate and arguments needed to posed the query to the engine
:param var_store:
:param query:
:param max_time:
:param max_depth:
:param max_inference:
:return:
"""
if len(query) == 1:
query = query[0]
if not (max_time or max_depth or max_inference):
predicate_name = query.get_predicate().get_name()
query_args = swipy.swipy_new_term_refs(query.get_predicate().get_arity())
for ind, arg in enumerate(query.get_arguments()):
_to_swipy_ref(arg, query_args + ind, var_store)
pred = swipy.swipy_predicate(predicate_name, query.get_predicate().get_arity(), None)
return pred, query_args
else:
query_term = _lit_to_swipy(query, var_store)
if max_time:
# if time limit should be imposed on the query
pred = swipy.swipy_predicate("call_with_time_limit", 2, None)
query_args = swipy.swipy_new_term_refs(2)
swipy.swipy_put_integer(query_args, max_time)
swipy.swipy_put_term(query_args+1, query_term)
return pred, query_args
elif max_depth or max_inference:
pred = swipy.swipy_predicate("call_with_depth_limit", 3, None) if max_depth else swipy.swipy_predicate("call_with_inference_limit", 3, None)
query_args = swipy.swipy_new_term_refs(3)
swipy.swipy_put_term(query_args, query_term)
if max_depth:
_num_to_swipy_ref(max_depth, query_args + 1)
else:
_num_to_swipy_ref(max_inference, query_args + 1)
swipy.swipy_put_variable(query_args + 2)
return pred, query_args
else:
swipy_objs = [_lit_to_swipy(x, var_store) if isinstance(x, Atom) else _neg_to_swipy(x, var_store) for x
in query]
if not (max_time or max_depth or max_inference):
first = swipy_objs[0]
rest = _conjoin_literals(swipy_objs[1:])
compound_arg = swipy.swipy_new_term_refs(2)
swipy.swipy_put_term(compound_arg, first)
swipy.swipy_put_term(compound_arg + 1, rest)
predicate = swipy.swipy_predicate(",", 2, None)
return predicate, compound_arg
else:
query_term = _conjoin_literals(swipy_objs)
if max_time:
# if time limit should be imposed on the query
wrapped_term = self._wrap_in_call_time(query_term, max_time)
exception = swipy.swipy_new_atom('time_limit_exceeded')
fail = swipy.swipy_new_atom('fail')
pred = swipy.swipy_predicate("catch", 3, None)
query_args = swipy.swipy_new_term_refs(3)
swipy.swipy_put_term(query_args, wrapped_term)
swipy.swipy_put_term(query_args + 1, exception)
swipy.swipy_put_term(query_args + 2, fail)
return pred, query_args
elif max_depth or max_inference:
pred = swipy.swipy_predicate("call_with_depth_limit", 3, None) if max_depth else swipy.swipy_predicate("call_with_inference_limit", 3, None)
query_args = swipy.swipy_new_term_refs(3)
swipy.swipy_put_term(query_args, query_term)
if max_depth:
_num_to_swipy_ref(max_depth, query_args + 1)
else:
_num_to_swipy_ref(max_inference, query_args + 1)
swipy.swipy_put_variable(query_args + 2)
return pred, query_args