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"""Utilities for destructuring values using matchables and match targets. |
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Given a value to destructure, called ``value``: |
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- Construct a matchable: ``matchable = Matchable(value)`` |
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- The matchable is initially falsy, but it will become truthy if it is passed a |
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**match target** that matches ``value``: |
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``assert matchable(some_pattern_that_matches)`` (Matchable returns itself |
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from the call, so you can put the calls in an if-elif block, and only make a |
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given call at most once.) |
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- When the matchable is truthy, it can be indexed to access bindings created by |
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the target. |
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""" |
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from __future__ import annotations |
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import typing |
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from . import _attribute_constructor |
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from ._class_placeholder import Placeholder |
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from ._match.descriptor import common |
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from ._match.descriptor import function as function_ |
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from ._match.descriptor import property_ |
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from ._match.destructure import names |
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from ._match.match_dict import MatchDict |
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from ._match.matchable import Matchable |
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from ._match.patterns.basic_patterns import Pattern |
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from ._match.patterns.bind import Bind |
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from ._match.patterns.mapping_match import AttrPattern |
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from ._match.patterns.mapping_match import DictPattern |
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# In lower-case for aesthetics. |
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pat = _attribute_constructor.AttributeConstructor( # pylint: disable=invalid-name |
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Pattern |
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) |
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@typing.overload |
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def function(func: typing.Callable) -> function_.Function: |
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"""Normal functions and methods go to Functions""" |
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@typing.overload |
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def function(func: staticmethod) -> function_.StaticMethod: |
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"""Static methods go to StaticMethods""" |
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@typing.overload |
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def function(func: classmethod) -> function_.ClassMethod: |
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"""Class methods go to ClassMethods.""" |
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@typing.overload |
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def function(func: property) -> property_.Property: |
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"""And properties go to Properties.""" |
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def function(func: typing.Any) -> common.Descriptor: |
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"""Convert a function to dispatch by value. |
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The original function is not called when the dispatch function is invoked. |
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""" |
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if isinstance(func, staticmethod): |
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return function_.StaticMethod(func.__func__) |
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if isinstance(func, classmethod): |
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return function_.ClassMethod(func.__func__) |
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if isinstance(func, property): |
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return property_.Property(func.fget, func.fset, func.fdel, func.__doc__) |
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return function_.Function(func) |
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Deco = typing.Callable[[typing.Callable], typing.Callable] |
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def decorate_in_order(*args: Deco) -> Deco: |
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"""Apply decorators in the order they're passed to the function.""" |
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def decorator(func: typing.Callable) -> typing.Callable: |
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for arg in args: |
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func = arg(func) |
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return func |
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return decorator |
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86
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__all__ = [ |
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"AttrPattern", |
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"Bind", |
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"DictPattern", |
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"MatchDict", |
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"Matchable", |
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"Pattern", |
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"Placeholder", |
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"decorate_in_order", |
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"function", |
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"names", |
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"pat", |
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] |
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mwchase /
python-structured-data
