80 lines
2.4 KiB
Python
80 lines
2.4 KiB
Python
import inspect
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from matplotlib import cbook
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class Substitution:
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"""
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A decorator that performs %-substitution on an object's docstring.
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This decorator should be robust even if ``obj.__doc__`` is None (for
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example, if -OO was passed to the interpreter).
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Usage: construct a docstring.Substitution with a sequence or dictionary
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suitable for performing substitution; then decorate a suitable function
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with the constructed object, e.g.::
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sub_author_name = Substitution(author='Jason')
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@sub_author_name
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def some_function(x):
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"%(author)s wrote this function"
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# note that some_function.__doc__ is now "Jason wrote this function"
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One can also use positional arguments::
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sub_first_last_names = Substitution('Edgar Allen', 'Poe')
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@sub_first_last_names
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def some_function(x):
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"%s %s wrote the Raven"
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"""
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def __init__(self, *args, **kwargs):
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if args and kwargs:
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raise TypeError("Only positional or keyword args are allowed")
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self.params = args or kwargs
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def __call__(self, func):
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if func.__doc__:
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func.__doc__ %= self.params
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return func
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def update(self, *args, **kwargs):
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"""
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Update ``self.params`` (which must be a dict) with the supplied args.
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"""
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self.params.update(*args, **kwargs)
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@classmethod
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@cbook.deprecated("3.3", alternative="assign to the params attribute")
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def from_params(cls, params):
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"""
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In the case where the params is a mutable sequence (list or
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dictionary) and it may change before this class is called, one may
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explicitly use a reference to the params rather than using *args or
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**kwargs which will copy the values and not reference them.
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"""
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result = cls()
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result.params = params
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return result
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def copy(source):
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"""Copy a docstring from another source function (if present)."""
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def do_copy(target):
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if source.__doc__:
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target.__doc__ = source.__doc__
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return target
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return do_copy
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# Create a decorator that will house the various docstring snippets reused
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# throughout Matplotlib.
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interpd = Substitution()
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def dedent_interpd(func):
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"""Dedent *func*'s docstring, then interpolate it with ``interpd``."""
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func.__doc__ = inspect.getdoc(func)
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return interpd(func)
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