133 lines
3.9 KiB
Python
133 lines
3.9 KiB
Python
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#!/usr/bin/python
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#
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# Urwid split_repr helper functions
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# Copyright (C) 2004-2011 Ian Ward
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#
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with this library; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#
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# Urwid web site: https://urwid.org/
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from __future__ import annotations
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from inspect import getfullargspec
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def split_repr(self):
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"""
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Return a helpful description of the object using
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self._repr_words() and self._repr_attrs() to add
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to the description. This function may be used by
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adding code to your class like this:
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>>> class Foo(object):
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... __repr__ = split_repr
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... def _repr_words(self):
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... return ["words", "here"]
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... def _repr_attrs(self):
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... return {'attrs': "appear too"}
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>>> Foo()
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<Foo words here attrs='appear too'>
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>>> class Bar(Foo):
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... def _repr_words(self):
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... return Foo._repr_words(self) + ["too"]
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... def _repr_attrs(self):
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... return dict(Foo._repr_attrs(self), barttr=42)
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>>> Bar()
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<Bar words here too attrs='appear too' barttr=42>
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"""
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alist = sorted((str(k), normalize_repr(v)) for k, v in self._repr_attrs().items())
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words = self._repr_words()
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if not words and not alist:
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# if we're just going to print the classname fall back
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# to the previous __repr__ implementation instead
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return super(self.__class__, self).__repr__()
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if words and alist: words.append("")
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return "<%s %s>" % (self.__class__.__name__,
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" ".join(words) +
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" ".join(["%s=%s" % itm for itm in alist]))
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def normalize_repr(v):
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"""
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Return dictionary repr sorted by keys, leave others unchanged
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>>> normalize_repr({1:2,3:4,5:6,7:8})
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'{1: 2, 3: 4, 5: 6, 7: 8}'
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>>> normalize_repr('foo')
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"'foo'"
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"""
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if isinstance(v, dict):
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items = sorted((repr(k), repr(v)) for k, v in v.items())
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return f"{{{', '.join([('%s: %s' % itm) for itm in items])}}}"
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return repr(v)
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def remove_defaults(d, fn):
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"""
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Remove keys in d that are set to the default values from
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fn. This method is used to unclutter the _repr_attrs()
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return value.
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d will be modified by this function.
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Returns d.
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>>> class Foo(object):
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... def __init__(self, a=1, b=2):
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... self.values = a, b
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... __repr__ = split_repr
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... def _repr_words(self):
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... return ["object"]
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... def _repr_attrs(self):
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... d = dict(a=self.values[0], b=self.values[1])
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... return remove_defaults(d, Foo.__init__)
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>>> Foo(42, 100)
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<Foo object a=42 b=100>
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>>> Foo(10, 2)
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<Foo object a=10>
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>>> Foo()
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<Foo object>
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"""
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args, varargs, varkw, defaults, _, _, _ = getfullargspec(fn)
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# ignore *varargs and **kwargs
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if varkw:
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del args[-1]
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if varargs:
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del args[-1]
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# create a dictionary of args with default values
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ddict = dict(list(zip(args[len(args) - len(defaults):], defaults)))
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for k in list(d.keys()):
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if k in ddict:
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# remove values that match their defaults
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if ddict[k] == d[k]:
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del d[k]
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return d
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def _test():
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import doctest
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doctest.testmod()
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if __name__=='__main__':
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_test()
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