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# Copyright (c) 2005 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.
__all__ = [ 'multidict' ]
class multidict(object):
__nodefault = object()
def __init__(self, parent = {}, **kwargs):
self.dict = dict(**kwargs)
self.parent = parent
self.deleted = {}
def __str__(self):
return str(dict(self.items()))
def __repr__(self):
return `dict(self.items())`
def __contains__(self, key):
return self.dict.has_key(key) or self.parent.has_key(key)
def __delitem__(self, key):
try:
del self.dict[key]
except KeyError, e:
if key in self.parent:
self.deleted[key] = True
else:
raise KeyError, e
def __setitem__(self, key, value):
self.deleted.pop(key, False)
self.dict[key] = value
def __getitem__(self, key):
try:
return self.dict[key]
except KeyError, e:
if not self.deleted.get(key, False) and key in self.parent:
return self.parent[key]
else:
raise KeyError, e
def __len__(self):
return len(self.dict) + len(self.parent)
def next(self):
for key,value in self.dict.items():
yield key,value
if self.parent:
for key,value in self.parent.next():
if key not in self.dict and key not in self.deleted:
yield key,value
def has_key(self, key):
return key in self
def iteritems(self):
for item in self.next():
yield item
def items(self):
return [ item for item in self.next() ]
def iterkeys(self):
for key,value in self.next():
yield key
def keys(self):
return [ key for key,value in self.next() ]
def itervalues(self):
for key,value in self.next():
yield value
def values(self):
return [ value for key,value in self.next() ]
def get(self, key, default=__nodefault):
try:
return self[key]
except KeyError, e:
if default != self.__nodefault:
return default
else:
raise KeyError, e
def setdefault(self, key, default):
try:
return self[key]
except KeyError:
self.deleted.pop(key, False)
self.dict[key] = default
return default
def _dump(self):
print 'multidict dump'
node = self
while isinstance(node, multidict):
print ' ', node.dict
node = node.parent
def _dumpkey(self, key):
values = []
node = self
while isinstance(node, multidict):
if key in node.dict:
values.append(node.dict[key])
node = node.parent
print key, values
if __name__ == '__main__':
test1 = multidict()
test2 = multidict(test1)
test3 = multidict(test2)
test4 = multidict(test3)
test1['a'] = 'test1_a'
test1['b'] = 'test1_b'
test1['c'] = 'test1_c'
test1['d'] = 'test1_d'
test1['e'] = 'test1_e'
test2['a'] = 'test2_a'
del test2['b']
test2['c'] = 'test2_c'
del test1['a']
test2.setdefault('f', multidict)
print 'test1>', test1.items()
print 'test2>', test2.items()
#print test1['a']
print test1['b']
print test1['c']
print test1['d']
print test1['e']
print test2['a']
#print test2['b']
print test2['c']
print test2['d']
print test2['e']
for key in test2.iterkeys():
print key
test2.get('g', 'foo')
#test2.get('b')
test2.get('b', 'bar')
test2.setdefault('b', 'blah')
print test1
print test2
print `test2`
print len(test2)
test3['a'] = [ 0, 1, 2, 3 ]
print test4
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