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# Copyright (c) 2006 The Regents of The University of Michigan
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met: redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer;
# redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution;
# neither the name of the copyright holders nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
# Authors: Nathan Binkert
__all__ = [ 'attrdict', 'multiattrdict', 'optiondict' ]
class attrdict(dict):
"""Wrap dict, so you can use attribute access to get/set elements"""
def __getattr__(self, attr):
if attr in self:
return self.__getitem__(attr)
return super(attrdict, self).__getattribute__(attr)
def __setattr__(self, attr, value):
if attr in dir(self) or attr.startswith('_'):
return super(attrdict, self).__setattr__(attr, value)
return self.__setitem__(attr, value)
def __delattr__(self, attr):
if attr in self:
return self.__delitem__(attr)
return super(attrdict, self).__delattr__(attr, value)
class multiattrdict(attrdict):
"""Wrap attrdict so that nested attribute accesses automatically create
nested dictionaries."""
def __getattr__(self, attr):
try:
return super(multiattrdict, self).__getattr__(attr)
except AttributeError:
d = optiondict()
setattr(self, attr, d)
return d
class optiondict(attrdict):
"""Modify attrdict so that a missing attribute just returns None"""
def __getattr__(self, attr):
try:
return super(optiondict, self).__getattr__(attr)
except AttributeError:
return None
if __name__ == '__main__':
x = attrdict()
x.y = 1
x['z'] = 2
print x['y'], x.y
print x['z'], x.z
print dir(x)
print x
print
del x['y']
del x.z
print dir(x)
print(x)
x = multiattrdict()
x.y.z = 9
print x
print x.y
print x.y.z
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