forked from anton/matekasse
108 lines
2.8 KiB
Python
108 lines
2.8 KiB
Python
"""
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Hook wrapper "result" utilities.
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"""
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from __future__ import annotations
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from types import TracebackType
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from typing import Callable
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from typing import cast
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from typing import Generator
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from typing import Generic
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from typing import Optional
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from typing import Tuple
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from typing import Type
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from typing import TYPE_CHECKING
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from typing import TypeVar
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if TYPE_CHECKING:
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from typing import NoReturn
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_ExcInfo = Tuple[Type[BaseException], BaseException, Optional[TracebackType]]
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_T = TypeVar("_T")
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def _raise_wrapfail(
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wrap_controller: (
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Generator[None, _Result[_T], None] | Generator[None, object, object]
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),
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msg: str,
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) -> NoReturn:
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co = wrap_controller.gi_code
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raise RuntimeError(
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"wrap_controller at %r %s:%d %s"
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% (co.co_name, co.co_filename, co.co_firstlineno, msg)
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)
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class HookCallError(Exception):
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"""Hook was called incorrectly."""
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class _Result(Generic[_T]):
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__slots__ = ("_result", "_exception")
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def __init__(
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self,
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result: _T | None,
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exception: BaseException | None,
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) -> None:
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self._result = result
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self._exception = exception
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@property
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def excinfo(self) -> _ExcInfo | None:
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exc = self._exception
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if exc is None:
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return None
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else:
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return (type(exc), exc, exc.__traceback__)
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@property
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def exception(self) -> BaseException | None:
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return self._exception
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@classmethod
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def from_call(cls, func: Callable[[], _T]) -> _Result[_T]:
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__tracebackhide__ = True
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result = exception = None
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try:
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result = func()
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except BaseException as exc:
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exception = exc
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return cls(result, exception)
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def force_result(self, result: _T) -> None:
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"""Force the result(s) to ``result``.
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If the hook was marked as a ``firstresult`` a single value should
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be set, otherwise set a (modified) list of results. Any exceptions
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found during invocation will be deleted.
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This overrides any previous result or exception.
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"""
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self._result = result
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self._exception = None
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def force_exception(self, exception: BaseException) -> None:
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"""Force the result to fail with ``exception``.
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This overrides any previous result or exception.
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.. versionadded:: 1.1.0
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"""
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self._result = None
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self._exception = exception
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def get_result(self) -> _T:
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"""Get the result(s) for this hook call.
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If the hook was marked as a ``firstresult`` only a single value
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will be returned, otherwise a list of results.
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"""
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__tracebackhide__ = True
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exc = self._exception
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if exc is None:
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return cast(_T, self._result)
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else:
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raise exc.with_traceback(exc.__traceback__)
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