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88 lines
2.5 KiB
88 lines
2.5 KiB
# SPDX-License-Identifier: MIT
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import inspect
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import platform
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import sys
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import threading
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from collections.abc import Mapping, Sequence # noqa: F401
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from typing import _GenericAlias
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PYPY = platform.python_implementation() == "PyPy"
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PY_3_8_PLUS = sys.version_info[:2] >= (3, 8)
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PY_3_9_PLUS = sys.version_info[:2] >= (3, 9)
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PY310 = sys.version_info[:2] >= (3, 10)
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PY_3_12_PLUS = sys.version_info[:2] >= (3, 12)
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if sys.version_info < (3, 8):
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try:
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from typing_extensions import Protocol
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except ImportError: # pragma: no cover
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Protocol = object
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else:
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from typing import Protocol # noqa: F401
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class _AnnotationExtractor:
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"""
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Extract type annotations from a callable, returning None whenever there
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is none.
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"""
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__slots__ = ["sig"]
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def __init__(self, callable):
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try:
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self.sig = inspect.signature(callable)
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except (ValueError, TypeError): # inspect failed
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self.sig = None
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def get_first_param_type(self):
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"""
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Return the type annotation of the first argument if it's not empty.
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"""
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if not self.sig:
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return None
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params = list(self.sig.parameters.values())
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if params and params[0].annotation is not inspect.Parameter.empty:
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return params[0].annotation
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return None
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def get_return_type(self):
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"""
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Return the return type if it's not empty.
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"""
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if (
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self.sig
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and self.sig.return_annotation is not inspect.Signature.empty
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):
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return self.sig.return_annotation
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return None
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# Thread-local global to track attrs instances which are already being repr'd.
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# This is needed because there is no other (thread-safe) way to pass info
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# about the instances that are already being repr'd through the call stack
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# in order to ensure we don't perform infinite recursion.
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#
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# For instance, if an instance contains a dict which contains that instance,
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# we need to know that we're already repr'ing the outside instance from within
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# the dict's repr() call.
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#
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# This lives here rather than in _make.py so that the functions in _make.py
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# don't have a direct reference to the thread-local in their globals dict.
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# If they have such a reference, it breaks cloudpickle.
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repr_context = threading.local()
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def get_generic_base(cl):
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"""If this is a generic class (A[str]), return the generic base for it."""
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if cl.__class__ is _GenericAlias:
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return cl.__origin__
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return None
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