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import functools |
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import typing |
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from ... import _class_placeholder |
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from .. import destructure |
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T = typing.TypeVar("T") |
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Matcher = typing.Union[T, typing.Callable[[type], T]] |
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MatcherList = typing.List[typing.Tuple[Matcher[T], typing.Callable]] |
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def _check_structure(structure) -> None: |
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destructure.names(structure) # Raise ValueError if there are duplicates |
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def decorate(matchers: MatcherList[T], structure: Matcher[T]): |
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if not _class_placeholder.is_placeholder(structure): |
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_check_structure(structure) |
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def decorator(func: typing.Callable) -> typing.Callable: |
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matchers.append((structure, func)) |
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return func |
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return decorator |
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class Decorator: |
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"""Base class for decorator classes.""" |
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__wrapped__ = None |
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def __new__(cls, func, *args, **kwargs): |
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new = super().__new__(cls, *args, **kwargs) |
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new.__doc__ = None |
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if func is None: |
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return new |
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return functools.wraps(func)(new) |
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class Descriptor(Decorator): |
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owner: type |
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def __set_name__(self, owner, name): |
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if getattr(self, "owner", owner) is not owner: |
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return |
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self.owner = owner |
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def _matchers( |
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self |
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) -> typing.Iterator[typing.List[typing.Tuple[typing.Any, typing.Callable]]]: |
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raise NotImplementedError |
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def for_class(self, cls: type) -> None: |
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for matchers in self._matchers(): |
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matchers[:] = [ |
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( |
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(structure(cls), func) |
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if _class_placeholder.is_placeholder(structure) |
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else (structure, func) |
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) |
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for (structure, func) in matchers |
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] |
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def for_class(cls: type) -> None: |
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for attr in vars(cls).values(): |
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if isinstance(attr, Descriptor): |
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attr.for_class(cls) |
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mwchase /
python-structured-data
