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# Copyright (c) 2015 Mirantis, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
# flake8: noqa: E731
import sys
from yaql.language import exceptions
from yaql.language import expressions
from yaql.language import utils
from yaql.language import yaqltypes
def call(name, context, args, kwargs, engine, receiver=utils.NO_VALUE,
data_context=None, use_convention=False, function_filter=None):
if data_context is None:
data_context = context
if function_filter is None:
function_filter = lambda fd, ctx: True
if receiver is utils.NO_VALUE:
predicate = lambda fd, ctx: fd.is_function and function_filter(fd, ctx)
else:
predicate = lambda fd, ctx: fd.is_method and function_filter(fd, ctx)
all_overloads = context.collect_functions(
name, predicate, use_convention=use_convention)
if not all_overloads:
if receiver is utils.NO_VALUE:
raise exceptions.NoFunctionRegisteredException(name)
else:
raise exceptions.NoMethodRegisteredException(name, receiver)
else:
delegate = choose_overload(
name, all_overloads, engine, receiver, data_context, args, kwargs)
try:
result = delegate()
utils.limit_memory_usage(engine, (1, result))
return result
except StopIteration as e:
raise exceptions.WrappedException(e).with_traceback(
sys.exc_info()[2])
def choose_overload(name, candidates, engine, receiver, context, args, kwargs):
def raise_ambiguous():
if receiver is utils.NO_VALUE:
raise exceptions.AmbiguousFunctionException(name)
else:
raise exceptions.AmbiguousMethodException(name, receiver)
def raise_not_found():
if receiver is utils.NO_VALUE:
raise exceptions.NoMatchingFunctionException(name)
else:
raise exceptions.NoMatchingMethodException(name, receiver)
candidates2 = []
lazy_params = None
no_kwargs = None
if receiver is not utils.NO_VALUE:
args = (receiver,) + args
for level in candidates:
new_level = []
for c in level:
if no_kwargs is None:
no_kwargs = c.no_kwargs
args, kwargs = translate_args(no_kwargs, args, kwargs)
elif no_kwargs != c.no_kwargs:
raise_ambiguous()
mapping = c.map_args(args, kwargs, context, engine)
if mapping is None:
continue
pos, kwd = mapping
lazy = set()
for i, pos_arg in enumerate(pos):
if isinstance(pos_arg.value_type, yaqltypes.LazyParameterType):
lazy.add(i)
for key, value in kwd.items():
if isinstance(value.value_type, yaqltypes.LazyParameterType):
lazy.add(key)
if lazy_params is None:
lazy_params = lazy
elif lazy_params != lazy:
raise_ambiguous()
new_level.append((c, mapping))
if new_level:
candidates2.append(new_level)
if len(candidates2) == 0:
raise_not_found()
arg_evaluator = lambda i, arg: ( # noqa: E731
arg(utils.NO_VALUE, context, engine)
if (i not in lazy_params and isinstance(arg, expressions.Expression)
and not isinstance(arg, expressions.Constant))
else arg
)
args = tuple(arg_evaluator(i, arg) for i, arg in enumerate(args))
for key, value in kwargs.items():
kwargs[key] = arg_evaluator(key, value)
delegate = None
winner_mapping = None
for level in candidates2:
for c, mapping in level:
try:
d = c.get_delegate(receiver, engine, context, args, kwargs)
except exceptions.ArgumentException:
pass
else:
if delegate is not None:
if _is_specialization_of(winner_mapping, mapping):
continue
elif not _is_specialization_of(mapping, winner_mapping):
raise_ambiguous()
delegate = d
winner_mapping = mapping
if delegate is not None:
break
if delegate is None:
raise_not_found()
return lambda: delegate()
def translate_args(without_kwargs, args, kwargs):
if without_kwargs:
if len(kwargs) > 0:
raise exceptions.ArgumentException(next(iter(kwargs)))
return args, {}
pos_args = []
kw_args = {}
for t in args:
if isinstance(t, expressions.MappingRuleExpression):
param_name = t.source
if isinstance(param_name, expressions.KeywordConstant):
param_name = param_name.value
else:
raise exceptions.MappingTranslationException()
kw_args[param_name] = t.destination
else:
pos_args.append(t)
for key, value in kwargs.items():
if key in kw_args:
raise exceptions.MappingTranslationException()
else:
kw_args[key] = value
return tuple(pos_args), kw_args
def _is_specialization_of(mapping1, mapping2):
args_mapping1, kwargs_mapping1 = mapping1
args_mapping2, kwargs_mapping2 = mapping2
res = False
for a1, a2 in zip(args_mapping1, args_mapping2):
if a2.value_type.is_specialization_of(a1.value_type):
return False
elif a1.value_type.is_specialization_of(a2.value_type):
res = True
for key, a1 in kwargs_mapping1.items():
a2 = kwargs_mapping2[key]
if a2.value_type.is_specialization_of(a1.value_type):
return False
elif a1.value_type.is_specialization_of(a2.value_type):
res = True
return res
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