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d�Zy)z.Utility functions for working with docstrings.� N)�ChainMap)� Signature)�chain� )�
DocstringMeta�DocstringParam�DocstringReturns�DocstringStyle�RenderingStyle)�compose�parse.� )�exclude�style�rendering_style�othersr r r �returnc �8 � ���� dt dt f� ���fd� }|S )aq A function decorator that parses the docstrings from `others`,
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composed result. Only parameters that are part of the decorated functions
signature are included in the combined docstring. When multiple sources for
a parameter or docstring metadata exists then the decorator will first
default to the wrapped function's value (when available) and otherwise use
the rightmost definition from ``others``.
The following example illustrates its usage:
>>> def fun1(a, b, c, d):
... '''short_description: fun1
...
... :param a: fun1
... :param b: fun1
... :return: fun1
... '''
>>> def fun2(b, c, d, e):
... '''short_description: fun2
...
... long_description: fun2
...
... :param b: fun2
... :param c: fun2
... :param e: fun2
... '''
>>> @combine_docstrings(fun1, fun2)
>>> def decorated(a, b, c, d, e, f):
... '''
... :param e: decorated
... :param f: decorated
... '''
>>> print(decorated.__doc__)
short_description: fun2
<BLANKLINE>
long_description: fun2
<BLANKLINE>
:param a: fun1
:param b: fun1
:param c: fun2
:param e: fun2
:param f: decorated
:returns: fun1
>>> @combine_docstrings(fun1, fun2, exclude=[DocstringReturns])
>>> def decorated(a, b, c, d, e, f): pass
>>> print(decorated.__doc__)
short_description: fun2
<BLANKLINE>
long_description: fun2
<BLANKLINE>
:param a: fun1
:param b: fun1
:param c: fun2
:param e: fun2
:param others: callables from which to parse docstrings.
:param exclude: an iterable of ``DocstringMeta`` subclasses to exclude when
combining docstrings.
:param style: style composed docstring. The default will infer the style
from the decorated function.
:param rendering_style: The rendering style used to compose a docstring.
:return: the decorated function with a modified docstring.
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