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