mirror of
https://github.com/PiBrewing/craftbeerpi4.git
synced 2024-11-14 02:58:16 +01:00
282 lines
9.2 KiB
Python
282 lines
9.2 KiB
Python
# Copyright (c) 2015-2020 Claudiu Popa <pcmanticore@gmail.com>
|
|
# Copyright (c) 2015-2016 Ceridwen <ceridwenv@gmail.com>
|
|
# Copyright (c) 2018 Bryce Guinta <bryce.paul.guinta@gmail.com>
|
|
|
|
# Licensed under the LGPL: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html
|
|
# For details: https://github.com/PyCQA/astroid/blob/master/COPYING.LESSER
|
|
|
|
|
|
"""
|
|
Various helper utilities.
|
|
"""
|
|
|
|
import builtins as builtins_mod
|
|
|
|
from astroid import bases
|
|
from astroid import context as contextmod
|
|
from astroid import exceptions
|
|
from astroid import manager
|
|
from astroid import nodes
|
|
from astroid import raw_building
|
|
from astroid import scoped_nodes
|
|
from astroid import util
|
|
|
|
|
|
BUILTINS = builtins_mod.__name__
|
|
|
|
|
|
def _build_proxy_class(cls_name, builtins):
|
|
proxy = raw_building.build_class(cls_name)
|
|
proxy.parent = builtins
|
|
return proxy
|
|
|
|
|
|
def _function_type(function, builtins):
|
|
if isinstance(function, scoped_nodes.Lambda):
|
|
if function.root().name == BUILTINS:
|
|
cls_name = "builtin_function_or_method"
|
|
else:
|
|
cls_name = "function"
|
|
elif isinstance(function, bases.BoundMethod):
|
|
cls_name = "method"
|
|
elif isinstance(function, bases.UnboundMethod):
|
|
cls_name = "function"
|
|
return _build_proxy_class(cls_name, builtins)
|
|
|
|
|
|
def _object_type(node, context=None):
|
|
astroid_manager = manager.AstroidManager()
|
|
builtins = astroid_manager.builtins_module
|
|
context = context or contextmod.InferenceContext()
|
|
|
|
for inferred in node.infer(context=context):
|
|
if isinstance(inferred, scoped_nodes.ClassDef):
|
|
if inferred.newstyle:
|
|
metaclass = inferred.metaclass(context=context)
|
|
if metaclass:
|
|
yield metaclass
|
|
continue
|
|
yield builtins.getattr("type")[0]
|
|
elif isinstance(inferred, (scoped_nodes.Lambda, bases.UnboundMethod)):
|
|
yield _function_type(inferred, builtins)
|
|
elif isinstance(inferred, scoped_nodes.Module):
|
|
yield _build_proxy_class("module", builtins)
|
|
else:
|
|
yield inferred._proxied
|
|
|
|
|
|
def object_type(node, context=None):
|
|
"""Obtain the type of the given node
|
|
|
|
This is used to implement the ``type`` builtin, which means that it's
|
|
used for inferring type calls, as well as used in a couple of other places
|
|
in the inference.
|
|
The node will be inferred first, so this function can support all
|
|
sorts of objects, as long as they support inference.
|
|
"""
|
|
|
|
try:
|
|
types = set(_object_type(node, context))
|
|
except exceptions.InferenceError:
|
|
return util.Uninferable
|
|
if len(types) > 1 or not types:
|
|
return util.Uninferable
|
|
return list(types)[0]
|
|
|
|
|
|
def _object_type_is_subclass(obj_type, class_or_seq, context=None):
|
|
if not isinstance(class_or_seq, (tuple, list)):
|
|
class_seq = (class_or_seq,)
|
|
else:
|
|
class_seq = class_or_seq
|
|
|
|
if obj_type is util.Uninferable:
|
|
return util.Uninferable
|
|
|
|
# Instances are not types
|
|
class_seq = [
|
|
item if not isinstance(item, bases.Instance) else util.Uninferable
|
|
for item in class_seq
|
|
]
|
|
# strict compatibility with issubclass
|
|
# issubclass(type, (object, 1)) evaluates to true
|
|
# issubclass(object, (1, type)) raises TypeError
|
|
for klass in class_seq:
|
|
if klass is util.Uninferable:
|
|
raise exceptions.AstroidTypeError("arg 2 must be a type or tuple of types")
|
|
|
|
for obj_subclass in obj_type.mro():
|
|
if obj_subclass == klass:
|
|
return True
|
|
return False
|
|
|
|
|
|
def object_isinstance(node, class_or_seq, context=None):
|
|
"""Check if a node 'isinstance' any node in class_or_seq
|
|
|
|
:param node: A given node
|
|
:param class_or_seq: Union[nodes.NodeNG, Sequence[nodes.NodeNG]]
|
|
:rtype: bool
|
|
|
|
:raises AstroidTypeError: if the given ``classes_or_seq`` are not types
|
|
"""
|
|
obj_type = object_type(node, context)
|
|
if obj_type is util.Uninferable:
|
|
return util.Uninferable
|
|
return _object_type_is_subclass(obj_type, class_or_seq, context=context)
|
|
|
|
|
|
def object_issubclass(node, class_or_seq, context=None):
|
|
"""Check if a type is a subclass of any node in class_or_seq
|
|
|
|
:param node: A given node
|
|
:param class_or_seq: Union[Nodes.NodeNG, Sequence[nodes.NodeNG]]
|
|
:rtype: bool
|
|
|
|
:raises AstroidTypeError: if the given ``classes_or_seq`` are not types
|
|
:raises AstroidError: if the type of the given node cannot be inferred
|
|
or its type's mro doesn't work
|
|
"""
|
|
if not isinstance(node, nodes.ClassDef):
|
|
raise TypeError("{node} needs to be a ClassDef node".format(node=node))
|
|
return _object_type_is_subclass(node, class_or_seq, context=context)
|
|
|
|
|
|
def safe_infer(node, context=None):
|
|
"""Return the inferred value for the given node.
|
|
|
|
Return None if inference failed or if there is some ambiguity (more than
|
|
one node has been inferred).
|
|
"""
|
|
try:
|
|
inferit = node.infer(context=context)
|
|
value = next(inferit)
|
|
except exceptions.InferenceError:
|
|
return None
|
|
try:
|
|
next(inferit)
|
|
return None # None if there is ambiguity on the inferred node
|
|
except exceptions.InferenceError:
|
|
return None # there is some kind of ambiguity
|
|
except StopIteration:
|
|
return value
|
|
|
|
|
|
def has_known_bases(klass, context=None):
|
|
"""Return true if all base classes of a class could be inferred."""
|
|
try:
|
|
return klass._all_bases_known
|
|
except AttributeError:
|
|
pass
|
|
for base in klass.bases:
|
|
result = safe_infer(base, context=context)
|
|
# TODO: check for A->B->A->B pattern in class structure too?
|
|
if (
|
|
not isinstance(result, scoped_nodes.ClassDef)
|
|
or result is klass
|
|
or not has_known_bases(result, context=context)
|
|
):
|
|
klass._all_bases_known = False
|
|
return False
|
|
klass._all_bases_known = True
|
|
return True
|
|
|
|
|
|
def _type_check(type1, type2):
|
|
if not all(map(has_known_bases, (type1, type2))):
|
|
raise exceptions._NonDeducibleTypeHierarchy
|
|
|
|
if not all([type1.newstyle, type2.newstyle]):
|
|
return False
|
|
try:
|
|
return type1 in type2.mro()[:-1]
|
|
except exceptions.MroError:
|
|
# The MRO is invalid.
|
|
raise exceptions._NonDeducibleTypeHierarchy
|
|
|
|
|
|
def is_subtype(type1, type2):
|
|
"""Check if *type1* is a subtype of *type2*."""
|
|
return _type_check(type1=type2, type2=type1)
|
|
|
|
|
|
def is_supertype(type1, type2):
|
|
"""Check if *type2* is a supertype of *type1*."""
|
|
return _type_check(type1, type2)
|
|
|
|
|
|
def class_instance_as_index(node):
|
|
"""Get the value as an index for the given instance.
|
|
|
|
If an instance provides an __index__ method, then it can
|
|
be used in some scenarios where an integer is expected,
|
|
for instance when multiplying or subscripting a list.
|
|
"""
|
|
context = contextmod.InferenceContext()
|
|
context.callcontext = contextmod.CallContext(args=[node])
|
|
|
|
try:
|
|
for inferred in node.igetattr("__index__", context=context):
|
|
if not isinstance(inferred, bases.BoundMethod):
|
|
continue
|
|
|
|
for result in inferred.infer_call_result(node, context=context):
|
|
if isinstance(result, nodes.Const) and isinstance(result.value, int):
|
|
return result
|
|
except exceptions.InferenceError:
|
|
pass
|
|
return None
|
|
|
|
|
|
def object_len(node, context=None):
|
|
"""Infer length of given node object
|
|
|
|
:param Union[nodes.ClassDef, nodes.Instance] node:
|
|
:param node: Node to infer length of
|
|
|
|
:raises AstroidTypeError: If an invalid node is returned
|
|
from __len__ method or no __len__ method exists
|
|
:raises InferenceError: If the given node cannot be inferred
|
|
or if multiple nodes are inferred
|
|
:rtype int: Integer length of node
|
|
"""
|
|
# pylint: disable=import-outside-toplevel; circular import
|
|
from astroid.objects import FrozenSet
|
|
|
|
inferred_node = safe_infer(node, context=context)
|
|
if inferred_node is None or inferred_node is util.Uninferable:
|
|
raise exceptions.InferenceError(node=node)
|
|
if isinstance(inferred_node, nodes.Const) and isinstance(
|
|
inferred_node.value, (bytes, str)
|
|
):
|
|
return len(inferred_node.value)
|
|
if isinstance(inferred_node, (nodes.List, nodes.Set, nodes.Tuple, FrozenSet)):
|
|
return len(inferred_node.elts)
|
|
if isinstance(inferred_node, nodes.Dict):
|
|
return len(inferred_node.items)
|
|
|
|
node_type = object_type(inferred_node, context=context)
|
|
if not node_type:
|
|
raise exceptions.InferenceError(node=node)
|
|
|
|
try:
|
|
len_call = next(node_type.igetattr("__len__", context=context))
|
|
except exceptions.AttributeInferenceError:
|
|
raise exceptions.AstroidTypeError(
|
|
"object of type '{}' has no len()".format(node_type.pytype())
|
|
)
|
|
|
|
result_of_len = next(len_call.infer_call_result(node, context))
|
|
if (
|
|
isinstance(result_of_len, nodes.Const)
|
|
and result_of_len.pytype() == "builtins.int"
|
|
):
|
|
return result_of_len.value
|
|
if isinstance(result_of_len, bases.Instance) and result_of_len.is_subtype_of(
|
|
"builtins.int"
|
|
):
|
|
# Fake a result as we don't know the arguments of the instance call.
|
|
return 0
|
|
raise exceptions.AstroidTypeError(
|
|
"'{}' object cannot be interpreted as an integer".format(result_of_len)
|
|
)
|