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42 lines
859 B
Python
42 lines
859 B
Python
from __future__ import annotations
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from .base import Always, Filter, FilterOrBool, Never
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__all__ = [
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"to_filter",
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"is_true",
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]
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_always = Always()
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_never = Never()
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_bool_to_filter: dict[bool, Filter] = {
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True: _always,
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False: _never,
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}
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def to_filter(bool_or_filter: FilterOrBool) -> Filter:
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"""
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Accept both booleans and Filters as input and
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turn it into a Filter.
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"""
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if isinstance(bool_or_filter, bool):
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return _bool_to_filter[bool_or_filter]
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if isinstance(bool_or_filter, Filter):
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return bool_or_filter
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raise TypeError(f"Expecting a bool or a Filter instance. Got {bool_or_filter!r}")
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def is_true(value: FilterOrBool) -> bool:
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"""
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Test whether `value` is True. In case of a Filter, call it.
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:param value: Boolean or `Filter` instance.
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"""
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return to_filter(value)()
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