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import inspect
import re
import types
def describe(article, value, name=None, verbose=False, capital=False):
"""Return string that describes a value
Parameters
----------
article : str or None
A definite or indefinite article. If the article is
indefinite (i.e. "a" or "an") the appropriate one
will be infered. Thus, the arguments of ``describe``
can themselves represent what the resulting string
will actually look like. If None, then no article
will be prepended to the result. For non-articled
description, values that are instances are treated
definitely, while classes are handled indefinitely.
value : any
The value which will be named.
name : str or None (default: None)
Only applies when ``article`` is "the" - this
``name`` is a definite reference to the value.
By default one will be infered from the value's
type and repr methods.
verbose : bool (default: False)
Whether the name should be concise or verbose. When
possible, verbose names include the module, and/or
class name where an object was defined.
capital : bool (default: False)
Whether the first letter of the article should
be capitalized or not. By default it is not.
Examples
--------
Indefinite description:
>>> describe("a", object())
'an object'
>>> describe("a", object)
'an object'
>>> describe("a", type(object))
'a type'
Definite description:
>>> describe("the", object())
"the object at '0x10741f1b0'"
>>> describe("the", object)
"the type 'object'"
>>> describe("the", type(object))
"the type 'type'"
Definitely named description:
>>> describe("the", object(), "I made")
'the object I made'
>>> describe("the", object, "I will use")
'the object I will use'
"""
if isinstance(article, str):
article = article.lower()
if not inspect.isclass(value):
typename = type(value).__name__
else:
typename = value.__name__
if verbose:
typename = _prefix(value) + typename
if article == "the" or (article is None and not inspect.isclass(value)):
if name is not None:
result = "{} {}".format(typename, name)
if article is not None:
return add_article(result, True, capital)
else:
return result
else:
tick_wrap = False
if inspect.isclass(value):
name = value.__name__
elif isinstance(value, types.FunctionType):
name = value.__name__
tick_wrap = True
elif isinstance(value, types.MethodType):
name = value.__func__.__name__
tick_wrap = True
elif type(value).__repr__ in (object.__repr__, type.__repr__):
name = "at '%s'" % hex(id(value))
verbose = False
else:
name = repr(value)
verbose = False
if verbose:
name = _prefix(value) + name
if tick_wrap:
name = name.join("''")
return describe(article, value, name=name,
verbose=verbose, capital=capital)
elif article in ("a", "an") or article is None:
if article is None:
return typename
return add_article(typename, False, capital)
else:
raise ValueError("The 'article' argument should "
"be 'the', 'a', 'an', or None not %r" % article)
def _prefix(value):
if isinstance(value, types.MethodType):
name = describe(None, value.__self__, verbose=True) + '.'
else:
module = inspect.getmodule(value)
if module is not None and module.__name__ != "builtins":
name = module.__name__ + '.'
else:
name = ""
return name
def class_of(value):
"""Returns a string of the value's type with an indefinite article.
For example 'an Image' or 'a PlotValue'.
"""
if inspect.isclass(value):
return add_article(value.__name__)
else:
return class_of(type(value))
def add_article(name, definite=False, capital=False):
"""Returns the string with a prepended article.
The input does not need to begin with a charater.
Parameters
----------
name : str
Name to which to prepend an article
definite : bool (default: False)
Whether the article is definite or not.
Indefinite articles being 'a' and 'an',
while 'the' is definite.
capital : bool (default: False)
Whether the added article should have
its first letter capitalized or not.
"""
if definite:
result = "the " + name
else:
first_letters = re.compile(r'[\W_]+').sub('', name)
if first_letters[:1].lower() in 'aeiou':
result = 'an ' + name
else:
result = 'a ' + name
if capital:
return result[0].upper() + result[1:]
else:
return result
def repr_type(obj):
"""Return a string representation of a value and its type for readable
error messages.
"""
the_type = type(obj)
msg = '{!r} {!r}'.format(obj, the_type)
return msg
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