File size: 3,069 Bytes
fe41391 |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 |
import inspect
from . import _api
class Substitution:
"""
A decorator that performs %-substitution on an object's docstring.
This decorator should be robust even if ``obj.__doc__`` is None (for
example, if -OO was passed to the interpreter).
Usage: construct a docstring.Substitution with a sequence or dictionary
suitable for performing substitution; then decorate a suitable function
with the constructed object, e.g.::
sub_author_name = Substitution(author='Jason')
@sub_author_name
def some_function(x):
"%(author)s wrote this function"
# note that some_function.__doc__ is now "Jason wrote this function"
One can also use positional arguments::
sub_first_last_names = Substitution('Edgar Allen', 'Poe')
@sub_first_last_names
def some_function(x):
"%s %s wrote the Raven"
"""
def __init__(self, *args, **kwargs):
if args and kwargs:
raise TypeError("Only positional or keyword args are allowed")
self.params = args or kwargs
def __call__(self, func):
if func.__doc__:
func.__doc__ = inspect.cleandoc(func.__doc__) % self.params
return func
def update(self, *args, **kwargs):
"""
Update ``self.params`` (which must be a dict) with the supplied args.
"""
self.params.update(*args, **kwargs)
class _ArtistKwdocLoader(dict):
def __missing__(self, key):
if not key.endswith(":kwdoc"):
raise KeyError(key)
name = key[:-len(":kwdoc")]
from matplotlib.artist import Artist, kwdoc
try:
cls, = [cls for cls in _api.recursive_subclasses(Artist)
if cls.__name__ == name]
except ValueError as e:
raise KeyError(key) from e
return self.setdefault(key, kwdoc(cls))
class _ArtistPropertiesSubstitution(Substitution):
"""
A `.Substitution` with two additional features:
- Substitutions of the form ``%(classname:kwdoc)s`` (ending with the
literal ":kwdoc" suffix) trigger lookup of an Artist subclass with the
given *classname*, and are substituted with the `.kwdoc` of that class.
- Decorating a class triggers substitution both on the class docstring and
on the class' ``__init__`` docstring (which is a commonly required
pattern for Artist subclasses).
"""
def __init__(self):
self.params = _ArtistKwdocLoader()
def __call__(self, obj):
super().__call__(obj)
if isinstance(obj, type) and obj.__init__ != object.__init__:
self(obj.__init__)
return obj
def copy(source):
"""Copy a docstring from another source function (if present)."""
def do_copy(target):
if source.__doc__:
target.__doc__ = source.__doc__
return target
return do_copy
# Create a decorator that will house the various docstring snippets reused
# throughout Matplotlib.
dedent_interpd = interpd = _ArtistPropertiesSubstitution()
|