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# copyright 2003-2013 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
#
# This file is part of astroid.
#
# astroid is free software: you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as published by the
# Free Software Foundation, either version 2.1 of the License, or (at your
# option) any later version.
#
# astroid is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
# FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
# for more details.
#
# You should have received a copy of the GNU Lesser General Public License along
# with astroid. If not, see <http://www.gnu.org/licenses/>.
#
# The code in this file was originally part of logilab-common, licensed under
# the same license.
""" A few useful function/method decorators."""
import wrapt
@wrapt.decorator
def cached(func, instance, args, kwargs):
"""Simple decorator to cache result of method calls without args."""
cache = getattr(instance, '__cache', None)
if cache is None:
instance.__cache = cache = {}
try:
return cache[func]
except KeyError:
cache[func] = result = func(*args, **kwargs)
return result
class cachedproperty(object):
""" Provides a cached property equivalent to the stacking of
@cached and @property, but more efficient.
After first usage, the <property_name> becomes part of the object's
__dict__. Doing:
del obj.<property_name> empties the cache.
Idea taken from the pyramid_ framework and the mercurial_ project.
.. _pyramid: http://pypi.python.org/pypi/pyramid
.. _mercurial: http://pypi.python.org/pypi/Mercurial
"""
__slots__ = ('wrapped',)
def __init__(self, wrapped):
try:
wrapped.__name__
except AttributeError:
raise TypeError('%s must have a __name__ attribute' %
wrapped)
self.wrapped = wrapped
@property
def __doc__(self):
doc = getattr(self.wrapped, '__doc__', None)
return ('<wrapped by the cachedproperty decorator>%s'
% ('\n%s' % doc if doc else ''))
def __get__(self, inst, objtype=None):
if inst is None:
return self
val = self.wrapped(inst)
setattr(inst, self.wrapped.__name__, val)
return val