def testLazyDictEq(self):
d = datatypes.LazyDict()
f = lambda x: x
d.add_lazy_item("f", f, "foo")
self.assertTrue(d.lazy_eq("f", f, "foo"))
self.assertFalse(d.lazy_eq("f", f, "bar"))
with self.assertRaises(KeyError):
d.lazy_eq("g", f, "foo")
self.assertEqual("foo", d["f"]) # evaluation
# The point of lazy_eq is to do approximate equality checks when we can't
# evaluate the function, so there's no way to determine "foo" != f("bar").
self.assertTrue(d.lazy_eq("f", f, "bar"))
def testLazyDict(self):
d = datatypes.LazyDict()
# To avoid surprising behavior, we require desired dict functionality to be
# explicitly overridden
with self.assertRaises(NotImplementedError):
d.viewitems()
x = []
def f(y):
# Change the state of x so that we can check whether f is evaluated at the
# right time
x.append(x)
return y
d.add_lazy_item("f", f, "foo")
self.assertIn("f", d)
self.assertEqual(1, len(d))
self.assertEqual(0, len(x))
# Evaluate the item
self.assertEqual("foo", d["f"])
self.assertEqual(1, len(x))
self.assertIn("f", d)
self.assertEqual(1, len(d))
def _constant_to_value(self, pyval, subst, get_node):
"""Create a AtomicAbstractValue that represents a python constant.
This supports both constant from code constant pools and PyTD constants such
as classes. This also supports builtin python objects such as int and float.
Args:
pyval: The python or PyTD value to convert.
subst: The current type parameters.
get_node: A getter function for the current node.
Returns:
A Value that represents the constant, or None if we couldn't convert.
Raises:
NotImplementedError: If we don't know how to convert a value.
TypeParameterError: If we can't find a substitution for a type parameter.
"""
if pyval.__class__ is str:
# We use a subclass of str, compat.BytesPy3, to mark Python 3
# bytestrings, which are converted to abstract bytes instances.
# compat.BytesType dispatches to this when appropriate.
return abstract.AbstractOrConcreteValue(pyval, self.str_type,
self.vm)
elif isinstance(pyval, compat.UnicodeType):
return abstract.AbstractOrConcreteValue(pyval, self.unicode_type,
self.vm)
elif isinstance(pyval, compat.BytesType):
return abstract.AbstractOrConcreteValue(pyval, self.bytes_type,
self.vm)
elif isinstance(pyval, bool):
return self.true if pyval is True else self.false
elif isinstance(pyval, int) and -1 <= pyval <= MAX_IMPORT_DEPTH:
# For small integers, preserve the actual value (for things like the
# level in IMPORT_NAME).
return abstract.AbstractOrConcreteValue(pyval, self.int_type,
self.vm)
elif isinstance(pyval, compat.LongType):
# long is aliased to int
return self.primitive_class_instances[int]
elif pyval.__class__ in self.primitive_classes:
return self.primitive_class_instances[pyval.__class__]
elif isinstance(pyval, (loadmarshal.CodeType, blocks.OrderedCode)):
return abstract.AbstractOrConcreteValue(
pyval, self.primitive_classes[types.CodeType], self.vm)
elif pyval is super:
return special_builtins.Super(self.vm)
elif pyval is object:
return special_builtins.Object(self.vm)
elif pyval.__class__ is type:
try:
return self.name_to_value(self._type_to_name(pyval), subst)
except (KeyError, AttributeError):
log.debug("Failed to find pytd", exc_info=True)
raise
elif isinstance(pyval, pytd.LateType):
actual = self._load_late_type(pyval)
return self._constant_to_value(actual, subst, get_node)
elif isinstance(pyval, pytd.TypeDeclUnit):
return self._create_module(pyval)
elif isinstance(pyval, pytd.Module):
mod = self.vm.loader.import_name(pyval.module_name)
return self._create_module(mod)
elif isinstance(pyval, pytd.Class):
if pyval.name == "__builtin__.super":
return self.vm.special_builtins["super"]
elif pyval.name == "__builtin__.object":
return self.object_type
elif pyval.name == "types.ModuleType":
return self.module_type
elif pyval.name == "_importlib_modulespec.ModuleType":
# Python 3's typeshed uses a stub file indirection to define ModuleType
# even though it is exported via types.pyi.
return self.module_type
else:
module, dot, base_name = pyval.name.rpartition(".")
try:
cls = abstract.PyTDClass(base_name, pyval, self.vm)
except mro.MROError as e:
self.vm.errorlog.mro_error(self.vm.frames, base_name,
e.mro_seqs)
cls = self.unsolvable
else:
if dot:
cls.module = module
return cls
elif isinstance(pyval, pytd.Function):
signatures = [
abstract.PyTDSignature(pyval.name, sig, self.vm)
for sig in pyval.signatures
]
type_new = self.vm.lookup_builtin("__builtin__.type").Lookup(
"__new__")
if pyval is type_new:
f_cls = special_builtins.TypeNew
else:
f_cls = abstract.PyTDFunction
f = f_cls(pyval.name, signatures, pyval.kind, self.vm)
f.is_abstract = pyval.is_abstract
return f
elif isinstance(pyval, pytd.ClassType):
assert pyval.cls
return self.constant_to_value(pyval.cls, subst,
self.vm.root_cfg_node)
elif isinstance(pyval, pytd.NothingType):
return self.empty
elif isinstance(pyval, pytd.AnythingType):
return self.unsolvable
elif (isinstance(pyval, pytd.Constant)
and isinstance(pyval.type, pytd.AnythingType)):
# We allow "X = ... # type: Any" to declare X as a type.
return self.unsolvable
elif isinstance(pyval, pytd.FunctionType):
return self.constant_to_value(pyval.function, subst,
self.vm.root_cfg_node)
elif isinstance(pyval, pytd.UnionType):
options = [
self.constant_to_value(t, subst, self.vm.root_cfg_node)
for t in pyval.type_list
]
if len(options) > 1:
return abstract.Union(options, self.vm)
else:
return options[0]
elif isinstance(pyval, pytd.TypeParameter):
constraints = tuple(
self.constant_to_value(c, {}, self.vm.root_cfg_node)
for c in pyval.constraints)
bound = (pyval.bound and self.constant_to_value(
pyval.bound, {}, self.vm.root_cfg_node))
return abstract.TypeParameter(pyval.name,
self.vm,
constraints=constraints,
bound=bound)
elif isinstance(pyval, abstract.AsInstance):
cls = pyval.cls
if isinstance(cls, pytd.LateType):
actual = self._load_late_type(cls)
if not isinstance(actual, pytd.ClassType):
return self.unsolvable
cls = actual.cls
if isinstance(cls, pytd.ClassType):
cls = cls.cls
if (isinstance(cls, pytd.GenericType)
and cls.base_type.name == "typing.ClassVar"):
param, = cls.parameters
return self.constant_to_value(abstract.AsInstance(param),
subst, self.vm.root_cfg_node)
elif isinstance(cls,
pytd.GenericType) or (isinstance(cls, pytd.Class)
and cls.template):
# If we're converting a generic Class, need to create a new instance of
# it. See test_classes.testGenericReinstantiated.
if isinstance(cls, pytd.Class):
params = tuple(t.type_param.upper_value
for t in cls.template)
cls = pytd.GenericType(base_type=pytd.ClassType(
cls.name, cls),
parameters=params)
if isinstance(cls.base_type, pytd.LateType):
actual = self._load_late_type(cls.base_type)
if not isinstance(actual, pytd.ClassType):
return self.unsolvable
base_cls = actual.cls
else:
assert isinstance(cls.base_type, pytd.ClassType)
base_cls = cls.base_type.cls
assert isinstance(base_cls, pytd.Class), base_cls
if base_cls.name == "__builtin__.type":
c, = cls.parameters
if isinstance(c, pytd.TypeParameter):
if not subst or c.name not in subst:
raise self.TypeParameterError(c.name)
return self.merge_classes(get_node(),
subst[c.name].data)
else:
return self.constant_to_value(c, subst,
self.vm.root_cfg_node)
elif isinstance(cls, pytd.TupleType):
content = tuple(
self.constant_to_var(abstract.AsInstance(p), subst,
get_node())
for p in cls.parameters)
return abstract.Tuple(content, self.vm)
elif isinstance(cls, pytd.CallableType):
clsval = self.constant_to_value(cls, subst,
self.vm.root_cfg_node)
return abstract.Instance(clsval, self.vm)
else:
clsval = self.constant_to_value(base_cls, subst,
self.vm.root_cfg_node)
instance = abstract.Instance(clsval, self.vm)
num_params = len(cls.parameters)
assert num_params <= len(base_cls.template)
for i, formal in enumerate(base_cls.template):
if i < num_params:
node = get_node()
p = self.constant_to_var(
abstract.AsInstance(cls.parameters[i]), subst,
node)
else:
# An omitted type parameter implies `Any`.
node = self.vm.root_cfg_node
p = self.unsolvable.to_variable(node)
instance.merge_type_parameter(node, formal.name, p)
return instance
elif isinstance(cls, pytd.Class):
assert not cls.template
# This key is also used in __init__
key = (abstract.Instance, cls)
if key not in self._convert_cache:
if cls.name in [
"__builtin__.type", "__builtin__.property"
]:
# An instance of "type" or of an anonymous property can be anything.
instance = self._create_new_unknown_value("type")
else:
mycls = self.constant_to_value(cls, subst,
self.vm.root_cfg_node)
instance = abstract.Instance(mycls, self.vm)
log.info("New pytd instance for %s: %r", cls.name,
instance)
self._convert_cache[key] = instance
return self._convert_cache[key]
else:
return self.constant_to_value(cls, subst,
self.vm.root_cfg_node)
elif (isinstance(pyval, pytd.GenericType)
and pyval.base_type.name == "typing.ClassVar"):
param, = pyval.parameters
return self.constant_to_value(param, subst, self.vm.root_cfg_node)
elif isinstance(pyval, pytd.GenericType):
if isinstance(pyval.base_type, pytd.LateType):
actual = self._load_late_type(pyval.base_type)
if not isinstance(actual, pytd.ClassType):
return self.unsolvable
base = actual.cls
else:
assert isinstance(pyval.base_type, pytd.ClassType)
base = pyval.base_type.cls
assert isinstance(base, pytd.Class), base
base_cls = self.constant_to_value(base, subst,
self.vm.root_cfg_node)
if not isinstance(base_cls, abstract.Class):
# base_cls can be, e.g., an unsolvable due to an mro error.
return self.unsolvable
if isinstance(pyval, pytd.TupleType):
abstract_class = abstract.TupleClass
template = list(range(len(pyval.parameters))) + [abstract.T]
parameters = pyval.parameters + (pytd.UnionType(
pyval.parameters), )
elif isinstance(pyval, pytd.CallableType):
abstract_class = abstract.Callable
template = list(range(len(
pyval.args))) + [abstract.ARGS, abstract.RET]
parameters = pyval.args + (pytd_utils.JoinTypes(
pyval.args), pyval.ret)
else:
abstract_class = abstract.ParameterizedClass
template = tuple(t.name for t in base.template)
parameters = pyval.parameters
assert (pyval.base_type.name == "typing.Generic"
or len(parameters) <= len(template))
type_parameters = datatypes.LazyDict()
for i, name in enumerate(template):
if i < len(parameters):
type_parameters.add_lazy_item(name, self.constant_to_value,
parameters[i], subst,
self.vm.root_cfg_node)
else:
type_parameters[name] = self.unsolvable
return abstract_class(base_cls, type_parameters, self.vm)
elif pyval.__class__ is tuple: # only match raw tuple, not namedtuple/Node
return self.tuple_to_value([
self.constant_to_var(item, subst, self.vm.root_cfg_node)
for i, item in enumerate(pyval)
])
else:
raise NotImplementedError("Can't convert constant %s %r" %
(type(pyval), pyval))
