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281 lines
9.5 KiB
Python
281 lines
9.5 KiB
Python
from __future__ import annotations
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from collections.abc import Callable, Sequence
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from functools import partial
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from inspect import getmro, isclass
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from typing import TYPE_CHECKING, Any, Generic, Type, TypeVar, cast, overload
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if TYPE_CHECKING:
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from typing import Self
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_BaseExceptionT_co = TypeVar("_BaseExceptionT_co", bound=BaseException, covariant=True)
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_BaseExceptionT = TypeVar("_BaseExceptionT", bound=BaseException)
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_ExceptionT_co = TypeVar("_ExceptionT_co", bound=Exception, covariant=True)
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_ExceptionT = TypeVar("_ExceptionT", bound=Exception)
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def check_direct_subclass(
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exc: BaseException, parents: tuple[type[BaseException]]
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) -> bool:
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for cls in getmro(exc.__class__)[:-1]:
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if cls in parents:
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return True
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return False
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def get_condition_filter(
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condition: type[_BaseExceptionT]
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| tuple[type[_BaseExceptionT], ...]
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| Callable[[_BaseExceptionT_co], bool]
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) -> Callable[[_BaseExceptionT_co], bool]:
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if isclass(condition) and issubclass(
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cast(Type[BaseException], condition), BaseException
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):
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return partial(check_direct_subclass, parents=(condition,))
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elif isinstance(condition, tuple):
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if all(isclass(x) and issubclass(x, BaseException) for x in condition):
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return partial(check_direct_subclass, parents=condition)
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elif callable(condition):
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return cast("Callable[[BaseException], bool]", condition)
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raise TypeError("expected a function, exception type or tuple of exception types")
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class BaseExceptionGroup(BaseException, Generic[_BaseExceptionT_co]):
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"""A combination of multiple unrelated exceptions."""
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def __new__(
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cls, __message: str, __exceptions: Sequence[_BaseExceptionT_co]
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) -> Self:
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if not isinstance(__message, str):
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raise TypeError(f"argument 1 must be str, not {type(__message)}")
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if not isinstance(__exceptions, Sequence):
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raise TypeError("second argument (exceptions) must be a sequence")
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if not __exceptions:
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raise ValueError(
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"second argument (exceptions) must be a non-empty sequence"
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)
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for i, exc in enumerate(__exceptions):
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if not isinstance(exc, BaseException):
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raise ValueError(
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f"Item {i} of second argument (exceptions) is not an " f"exception"
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)
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if cls is BaseExceptionGroup:
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if all(isinstance(exc, Exception) for exc in __exceptions):
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cls = ExceptionGroup
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return super().__new__(cls, __message, __exceptions)
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def __init__(
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self, __message: str, __exceptions: Sequence[_BaseExceptionT_co], *args: Any
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):
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super().__init__(__message, __exceptions, *args)
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self._message = __message
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self._exceptions = __exceptions
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def add_note(self, note: str) -> None:
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if not isinstance(note, str):
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raise TypeError(
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f"Expected a string, got note={note!r} (type {type(note).__name__})"
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)
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if not hasattr(self, "__notes__"):
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self.__notes__: list[str] = []
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self.__notes__.append(note)
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@property
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def message(self) -> str:
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return self._message
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@property
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def exceptions(
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self,
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) -> tuple[_BaseExceptionT_co | BaseExceptionGroup[_BaseExceptionT_co], ...]:
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return tuple(self._exceptions)
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@overload
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def subgroup(
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self, __condition: type[_BaseExceptionT] | tuple[type[_BaseExceptionT], ...]
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) -> BaseExceptionGroup[_BaseExceptionT] | None:
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...
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@overload
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def subgroup(
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self: Self, __condition: Callable[[_BaseExceptionT_co], bool]
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) -> Self | None:
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...
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def subgroup(
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self: Self,
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__condition: type[_BaseExceptionT]
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| tuple[type[_BaseExceptionT], ...]
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| Callable[[_BaseExceptionT_co], bool],
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) -> BaseExceptionGroup[_BaseExceptionT] | Self | None:
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condition = get_condition_filter(__condition)
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modified = False
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if condition(self):
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return self
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exceptions: list[BaseException] = []
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for exc in self.exceptions:
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if isinstance(exc, BaseExceptionGroup):
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subgroup = exc.subgroup(__condition)
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if subgroup is not None:
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exceptions.append(subgroup)
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if subgroup is not exc:
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modified = True
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elif condition(exc):
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exceptions.append(exc)
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else:
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modified = True
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if not modified:
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return self
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elif exceptions:
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group = self.derive(exceptions)
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group.__cause__ = self.__cause__
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group.__context__ = self.__context__
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group.__traceback__ = self.__traceback__
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return group
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else:
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return None
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@overload
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def split(
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self: Self,
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__condition: type[_BaseExceptionT] | tuple[type[_BaseExceptionT], ...],
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) -> tuple[BaseExceptionGroup[_BaseExceptionT] | None, Self | None]:
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...
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@overload
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def split(
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self: Self, __condition: Callable[[_BaseExceptionT_co], bool]
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) -> tuple[Self | None, Self | None]:
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...
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def split(
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self: Self,
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__condition: type[_BaseExceptionT]
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| tuple[type[_BaseExceptionT], ...]
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| Callable[[_BaseExceptionT_co], bool],
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) -> tuple[BaseExceptionGroup[_BaseExceptionT] | None, Self | None] | tuple[
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Self | None, Self | None
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]:
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condition = get_condition_filter(__condition)
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if condition(self):
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return self, None
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matching_exceptions: list[BaseException] = []
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nonmatching_exceptions: list[BaseException] = []
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for exc in self.exceptions:
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if isinstance(exc, BaseExceptionGroup):
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matching, nonmatching = exc.split(condition)
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if matching is not None:
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matching_exceptions.append(matching)
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if nonmatching is not None:
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nonmatching_exceptions.append(nonmatching)
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elif condition(exc):
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matching_exceptions.append(exc)
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else:
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nonmatching_exceptions.append(exc)
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matching_group: Self | None = None
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if matching_exceptions:
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matching_group = self.derive(matching_exceptions)
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matching_group.__cause__ = self.__cause__
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matching_group.__context__ = self.__context__
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matching_group.__traceback__ = self.__traceback__
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nonmatching_group: Self | None = None
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if nonmatching_exceptions:
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nonmatching_group = self.derive(nonmatching_exceptions)
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nonmatching_group.__cause__ = self.__cause__
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nonmatching_group.__context__ = self.__context__
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nonmatching_group.__traceback__ = self.__traceback__
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return matching_group, nonmatching_group
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def derive(self: Self, __excs: Sequence[_BaseExceptionT_co]) -> Self:
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eg = BaseExceptionGroup(self.message, __excs)
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if hasattr(self, "__notes__"):
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# Create a new list so that add_note() only affects one exceptiongroup
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eg.__notes__ = list(self.__notes__)
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return eg
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def __str__(self) -> str:
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suffix = "" if len(self._exceptions) == 1 else "s"
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return f"{self.message} ({len(self._exceptions)} sub-exception{suffix})"
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def __repr__(self) -> str:
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return f"{self.__class__.__name__}({self.message!r}, {self._exceptions!r})"
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class ExceptionGroup(BaseExceptionGroup[_ExceptionT_co], Exception):
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def __new__(cls, __message: str, __exceptions: Sequence[_ExceptionT_co]) -> Self:
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instance: ExceptionGroup[_ExceptionT_co] = super().__new__(
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cls, __message, __exceptions
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)
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if cls is ExceptionGroup:
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for exc in __exceptions:
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if not isinstance(exc, Exception):
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raise TypeError("Cannot nest BaseExceptions in an ExceptionGroup")
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return instance
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if TYPE_CHECKING:
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@property
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def exceptions(
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self,
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) -> tuple[_ExceptionT_co | ExceptionGroup[_ExceptionT_co], ...]:
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...
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@overload # type: ignore[override]
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def subgroup(
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self, __condition: type[_ExceptionT] | tuple[type[_ExceptionT], ...]
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) -> ExceptionGroup[_ExceptionT] | None:
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...
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@overload
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def subgroup(
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self: Self, __condition: Callable[[_ExceptionT_co], bool]
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) -> Self | None:
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...
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def subgroup(
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self: Self,
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__condition: type[_ExceptionT]
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| tuple[type[_ExceptionT], ...]
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| Callable[[_ExceptionT_co], bool],
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) -> ExceptionGroup[_ExceptionT] | Self | None:
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return super().subgroup(__condition)
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@overload # type: ignore[override]
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def split(
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self: Self, __condition: type[_ExceptionT] | tuple[type[_ExceptionT], ...]
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) -> tuple[ExceptionGroup[_ExceptionT] | None, Self | None]:
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...
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@overload
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def split(
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self: Self, __condition: Callable[[_ExceptionT_co], bool]
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) -> tuple[Self | None, Self | None]:
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...
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def split(
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self: Self,
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__condition: type[_ExceptionT]
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| tuple[type[_ExceptionT], ...]
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| Callable[[_ExceptionT_co], bool],
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) -> tuple[ExceptionGroup[_ExceptionT] | None, Self | None] | tuple[
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Self | None, Self | None
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]:
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return super().split(__condition)
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