/
yaqltypes.py
655 lines (499 loc) · 21.3 KB
/
yaqltypes.py
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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.
import abc
import collections
import datetime
from dateutil import tz
import six
from yaql.language import exceptions
from yaql.language import expressions
from yaql.language import utils
from yaql import yaql_interface
@six.add_metaclass(abc.ABCMeta)
class HiddenParameterType(object):
__slots__ = tuple()
# noinspection PyMethodMayBeStatic,PyUnusedLocal
def check(self, value, context, engine, *args, **kwargs):
return True
@six.add_metaclass(abc.ABCMeta)
class LazyParameterType(object):
__slots__ = tuple()
@six.add_metaclass(abc.ABCMeta)
class SmartType(object):
__slots__ = ('nullable',)
def __init__(self, nullable):
self.nullable = nullable
def check(self, value, context, engine, *args, **kwargs):
if value is None and not self.nullable:
return False
return True
def convert(self, value, receiver, context, function_spec, engine,
*args, **kwargs):
if not self.check(value, context, engine, *args, **kwargs):
raise exceptions.ArgumentValueException()
utils.limit_memory_usage(engine, (1, value))
return value
def is_specialization_of(self, other):
return False
class GenericType(SmartType):
__slots__ = ('checker', 'converter')
def __init__(self, nullable, checker=None, converter=None):
super(GenericType, self).__init__(nullable)
self.checker = checker
self.converter = converter
def check(self, value, context, engine, *args, **kwargs):
if isinstance(value, expressions.Constant):
value = value.value
if not super(GenericType, self).check(
value, context, engine, *args, **kwargs):
return False
if value is None or isinstance(value, expressions.Expression):
return True
if not self.checker:
return True
return self.checker(value, context, *args, **kwargs)
def convert(self, value, receiver, context, function_spec, engine,
*args, **kwargs):
if isinstance(value, expressions.Constant):
value = value.value
super(GenericType, self).convert(
value, receiver, context, function_spec, engine, *args, **kwargs)
if value is None or not self.converter:
return value
return self.converter(value, receiver, context, function_spec, engine,
*args, **kwargs)
class PythonType(GenericType):
__slots__ = ('python_type', 'validators')
def __init__(self, python_type, nullable=True, validators=None):
self.python_type = python_type
if not validators:
validators = [lambda _: True]
if not isinstance(validators, (list, tuple)):
validators = [validators]
self.validators = validators
super(PythonType, self).__init__(
nullable,
lambda value, context, *args, **kwargs: isinstance(
value, self.python_type) and all(
map(lambda t: t(value), self.validators)))
def is_specialization_of(self, other):
if not isinstance(other, PythonType):
return False
try:
len(self.python_type)
len(other.python_type)
except Exception:
return (
issubclass(self.python_type, other.python_type)
and not issubclass(other.python_type, self.python_type)
)
else:
return False
class MappingRule(LazyParameterType, SmartType):
__slots__ = tuple()
def __init__(self):
super(MappingRule, self).__init__(False)
def check(self, value, context, *args, **kwargs):
return isinstance(value, expressions.MappingRuleExpression)
def convert(self, value, receiver, context, function_spec, engine,
*args, **kwargs):
super(MappingRule, self).convert(
value, receiver, context, function_spec, engine, *args, **kwargs)
wrap = lambda func: lambda: func(receiver, context, engine) # noqa
return utils.MappingRule(wrap(value.source), wrap(value.destination))
class String(PythonType):
__slots__ = tuple()
def __init__(self, nullable=False):
super(String, self).__init__(six.string_types, nullable=nullable)
def convert(self, value, receiver, context, function_spec, engine,
*args, **kwargs):
value = super(String, self).convert(
value, receiver, context, function_spec, engine, *args, **kwargs)
return None if value is None else six.text_type(value)
class Integer(PythonType):
__slots__ = tuple()
def __init__(self, nullable=False):
super(Integer, self).__init__(
six.integer_types, nullable=nullable,
validators=[lambda t: not isinstance(t, bool)])
class DateTime(PythonType):
__slots__ = tuple()
utctz = tz.tzutc()
def __init__(self, nullable=False):
super(DateTime, self).__init__(datetime.datetime, nullable=nullable)
def convert(self, value, *args, **kwargs):
if isinstance(value, datetime.datetime):
if value.tzinfo is None:
return value.replace(tzinfo=self.utctz)
else:
return value
return super(DateTime, self).convert(value, *args, **kwargs)
class Iterable(PythonType):
__slots__ = tuple()
def __init__(self, validators=None, nullable=False):
super(Iterable, self).__init__(
collections.Iterable, nullable, [
lambda t: not isinstance(t, six.string_types + (
utils.MappingType,))] + (validators or []))
def check(self, value, context, engine, *args, **kwargs):
if isinstance(value, utils.MappingType) and engine.options.get(
'yaql.iterableDicts', False):
return True
return super(Iterable, self).check(
value, context, engine, *args, **kwargs)
def convert(self, value, receiver, context, function_spec, engine,
*args, **kwargs):
res = super(Iterable, self).convert(
value, receiver, context, function_spec, engine, *args, **kwargs)
return None if res is None else utils.limit_iterable(res, engine)
class Iterator(Iterable):
__slots__ = tuple()
def __init__(self, validators=None, nullable=False):
super(Iterator, self).__init__(
validators=[utils.is_iterator] + (validators or []),
nullable=nullable)
class Sequence(PythonType):
__slots__ = tuple()
def __init__(self, validators=None, nullable=False):
super(Sequence, self).__init__(
collections.Sequence, nullable, [
lambda t: not isinstance(t, six.string_types + (dict,))] + (
validators or []))
class Number(PythonType):
__slots__ = tuple()
def __init__(self, nullable=False):
super(Number, self).__init__(
six.integer_types + (float,), nullable,
validators=[lambda t: not isinstance(t, bool)])
class Lambda(LazyParameterType, SmartType):
__slots__ = ('with_context', 'method')
def __init__(self, with_context=False, method=False):
super(Lambda, self).__init__(True)
self.with_context = with_context
self.method = method
def check(self, value, context, *args, **kwargs):
if self.method and isinstance(
value, expressions.Expression) and not value.uses_receiver:
return False
return super(Lambda, self).check(value, context, *args, **kwargs)
@staticmethod
def _publish_params(context, args, kwargs):
for i, param in enumerate(args):
context['$' + str(i + 1)] = param
for arg_name, arg_value in kwargs.items():
context['$' + arg_name] = arg_value
def _call(self, value, receiver, context, engine, args, kwargs):
self._publish_params(context, args, kwargs)
if isinstance(value, expressions.Expression):
result = value(receiver, context, engine)
elif six.callable(value):
result = value(*args, **kwargs)
else:
result = value
return result
def convert(self, value, receiver, context, function_spec, engine,
*convert_args, **convert_kwargs):
super(Lambda, self).convert(
value, receiver, context, function_spec, engine,
*convert_args, **convert_kwargs)
if value is None:
return None
elif six.callable(value) and hasattr(value, '__unwrapped__'):
value = value.__unwrapped__
def func(*args, **kwargs):
if self.method and self.with_context:
new_receiver, new_context = args[:2]
args = args[2:]
elif self.method and not self.with_context:
new_receiver, new_context = \
args[0], context.create_child_context()
args = args[1:]
elif not self.method and self.with_context:
new_receiver, new_context = utils.NO_VALUE, args[0]
args = args[1:]
else:
new_receiver, new_context = \
utils.NO_VALUE, context.create_child_context()
return self._call(value, new_receiver, new_context,
engine, args, kwargs)
func.__unwrapped__ = value
return func
class Super(HiddenParameterType, SmartType):
__slots__ = ('with_context', 'method', 'with_name')
def __init__(self, with_context=False, method=None, with_name=False):
self.with_context = with_context
self.method = method
self.with_name = with_name
super(Super, self).__init__(False)
@staticmethod
def _find_function_context(spec, context):
while context is not None:
if spec in context:
return context
context = context.parent
raise exceptions.NoFunctionRegisteredException(
spec.name)
def convert(self, value, receiver, context, function_spec, engine,
*convert_args, **convert_kwargs):
if six.callable(value) and hasattr(value, '__unwrapped__'):
value = value.__unwrapped__
def func(*args, **kwargs):
function_context = self._find_function_context(
function_spec, context)
parent_function_context = function_context.parent
if parent_function_context is None:
raise exceptions.NoFunctionRegisteredException(
function_spec.name)
new_name = function_spec.name
if self.with_name:
new_name = args[0]
args = args[1:]
new_receiver = receiver
if self.method is True:
new_receiver = args[0]
args = args[1:]
elif self.method is False:
new_receiver = utils.NO_VALUE
if self.with_context:
new_context = args[0]
args = args[1:]
else:
new_context = context.create_child_context()
return parent_function_context(
new_name, engine, new_receiver, new_context)(*args, **kwargs)
func.__unwrapped__ = value
return func
class Context(HiddenParameterType, SmartType):
__slots__ = tuple()
def __init__(self):
super(Context, self).__init__(False)
def convert(self, value, receiver, context, function_spec, engine,
*args, **kwargs):
return context
class Delegate(HiddenParameterType, SmartType):
__slots__ = ('name', 'with_context', 'method', 'use_convention')
def __init__(self, name=None, with_context=False, method=False,
use_convention=True):
super(Delegate, self).__init__(False)
self.name = name
self.with_context = with_context
self.method = method
self.use_convention = use_convention
def convert(self, value, receiver, context, function_spec, engine,
*convert_args, **convert_kwargs):
if six.callable(value) and hasattr(value, '__unwrapped__'):
value = value.__unwrapped__
def func(*args, **kwargs):
name = self.name
if not name:
name = args[0]
args = args[1:]
new_receiver = utils.NO_VALUE
if self.method:
new_receiver = args[0]
args = args[1:]
if self.with_context:
new_context = args[0]
args = args[1:]
else:
new_context = context.create_child_context()
return new_context(
name, engine, new_receiver,
use_convention=self.use_convention)(*args, **kwargs)
func.__unwrapped__ = value
return func
class Receiver(HiddenParameterType, SmartType):
__slots__ = tuple()
def __init__(self):
super(Receiver, self).__init__(False)
def convert(self, value, receiver, context, function_spec, engine,
*args, **kwargs):
return receiver
class Engine(HiddenParameterType, SmartType):
__slots__ = tuple()
def __init__(self):
super(Engine, self).__init__(False)
def convert(self, value, receiver, context, function_spec, engine,
*args, **kwargs):
return engine
class FunctionDefinition(HiddenParameterType, SmartType):
__slots__ = tuple()
def __init__(self):
super(FunctionDefinition, self).__init__(False)
def convert(self, value, receiver, context, function_spec, engine,
*args, **kwargs):
return function_spec
class Constant(SmartType):
__slots__ = ('expand',)
def __init__(self, nullable, expand=True):
self.expand = expand
super(Constant, self).__init__(nullable)
def check(self, value, context, *args, **kwargs):
return super(Constant, self).check(
value, context, *args, **kwargs) and (
value is None or isinstance(value, expressions.Constant))
def convert(self, value, receiver, context, function_spec, engine,
*args, **kwargs):
super(Constant, self).convert(
value, receiver, context, function_spec, engine, *args, **kwargs)
return value.value if self.expand else value
class YaqlExpression(LazyParameterType, SmartType):
__slots__ = ('_expression_types',)
def __init__(self, expression_type=None):
super(YaqlExpression, self).__init__(False)
if expression_type and not utils.is_sequence(expression_type):
expression_type = (expression_type,)
self._expression_types = expression_type
def check(self, value, context, *args, **kwargs):
if not self._expression_types:
return isinstance(value, expressions.Expression)
return any(t == type(value) for t in self._expression_types)
def convert(self, value, receiver, context, function_spec, engine,
*args, **kwargs):
super(YaqlExpression, self).convert(
value, receiver, context, function_spec, engine, *args, **kwargs)
return value
class StringConstant(Constant):
__slots__ = tuple()
def __init__(self, nullable=False):
super(StringConstant, self).__init__(nullable)
def check(self, value, context, *args, **kwargs):
return super(StringConstant, self).check(
value, context, *args, **kwargs) and (
value is None or isinstance(value.value, six.string_types))
class Keyword(Constant):
__slots__ = tuple()
def __init__(self, expand=True):
super(Keyword, self).__init__(False, expand)
def check(self, value, context, *args, **kwargs):
return isinstance(value, expressions.KeywordConstant)
class BooleanConstant(Constant):
__slots__ = tuple()
def __init__(self, nullable=False, expand=True):
super(BooleanConstant, self).__init__(nullable, expand)
def check(self, value, context, *args, **kwargs):
return super(BooleanConstant, self).check(
value, context, *args, **kwargs) and (
value is None or type(value.value) is bool)
class NumericConstant(Constant):
__slots__ = tuple()
def __init__(self, nullable=False, expand=True):
super(NumericConstant, self).__init__(nullable, expand)
def check(self, value, context, *args, **kwargs):
return super(NumericConstant, self).check(
value, context, *args, **kwargs) and (
value is None or isinstance(
value.value, six.integer_types + (float,)) and
type(value.value) is not bool)
@six.add_metaclass(abc.ABCMeta)
class SmartTypeAggregation(SmartType):
__slots__ = ('types',)
def __init__(self, *args, **kwargs):
self.nullable = kwargs.pop('nullable', False)
super(SmartTypeAggregation, self).__init__(self.nullable)
self.types = []
for item in args:
if isinstance(item, (type, tuple)):
item = PythonType(item)
if isinstance(item, (HiddenParameterType, LazyParameterType)):
raise ValueError('Special smart types are not supported')
self.types.append(item)
class AnyOf(SmartTypeAggregation):
__slots__ = tuple()
def _check_match(self, value, context, engine, *args, **kwargs):
for type_to_check in self.types:
check_result = type_to_check.check(
value, context, engine, *args, **kwargs)
if check_result:
return type_to_check
def check(self, value, context, engine, *args, **kwargs):
if isinstance(value, expressions.Constant):
value = value.value
if value is None:
return self.nullable
check_result = self._check_match(
value, context, engine, *args, **kwargs)
return True if check_result else False
def convert(self, value, receiver, context, function_spec, engine,
*args, **kwargs):
if isinstance(value, expressions.Constant):
value = value.value
if value is None:
if self.nullable:
return None
else:
suitable_type = None
else:
suitable_type = self._check_match(
value, context, engine, *args, **kwargs)
if suitable_type:
return suitable_type.convert(
value, receiver, context, function_spec,
engine, *args, **kwargs)
raise exceptions.ArgumentValueException()
class Chain(SmartTypeAggregation):
__slots__ = tuple()
def _check_match(self, value, context, engine, *args, **kwargs):
for type_to_check in self.types:
check_result = type_to_check.check(
value, context, engine, *args, **kwargs)
if check_result:
return type_to_check
def check(self, value, context, engine, *args, **kwargs):
if isinstance(value, expressions.Constant):
value = value.value
if value is None:
return self.nullable
for type_to_check in self.types:
if not type_to_check.check(
value, context, engine, *args, **kwargs):
return False
return True
def convert(self, value, receiver, context, function_spec, engine,
*args, **kwargs):
if isinstance(value, expressions.Constant):
value = value.value
if value is None:
if self.nullable:
return None
raise exceptions.ArgumentValueException()
for smart_type in self.types:
value = smart_type.convert(
value, receiver, context, function_spec,
engine, *args, **kwargs)
return value
class NotOfType(SmartType):
__slots__ = ('smart_type',)
def __init__(self, smart_type, nullable=True):
if isinstance(smart_type, (type, tuple)):
smart_type = PythonType(smart_type, nullable=nullable)
self.smart_type = smart_type
super(NotOfType, self).__init__(nullable)
def check(self, value, context, engine, *args, **kwargs):
if isinstance(value, expressions.Constant):
value = value.value
if not super(NotOfType, self).check(
value, context, engine, *args, **kwargs):
return False
if value is None or isinstance(value, expressions.Expression):
return True
return not self.smart_type.check(
value, context, engine, *args, **kwargs)
class YaqlInterface(HiddenParameterType, SmartType):
__slots__ = tuple()
def __init__(self):
super(YaqlInterface, self).__init__(False)
def convert(self, value, receiver, context, function_spec, engine,
*args, **kwargs):
return yaql_interface.YaqlInterface(context, engine, receiver)