120 lines
3.3 KiB
Python
120 lines
3.3 KiB
Python
"""Drop-in replacement for collections.OrderedDict by Raymond Hettinger
|
|
|
|
http://code.activestate.com/recipes/576693/
|
|
|
|
"""
|
|
from UserDict import DictMixin
|
|
|
|
# Modified from original to support Python 2.4, see
|
|
# http://code.google.com/p/simplejson/issues/detail?id=53
|
|
try:
|
|
all
|
|
except NameError:
|
|
def all(seq):
|
|
for elem in seq:
|
|
if not elem:
|
|
return False
|
|
return True
|
|
|
|
class OrderedDict(dict, DictMixin):
|
|
|
|
def __init__(self, *args, **kwds):
|
|
if len(args) > 1:
|
|
raise TypeError('expected at most 1 arguments, got %d' % len(args))
|
|
try:
|
|
self.__end
|
|
except AttributeError:
|
|
self.clear()
|
|
self.update(*args, **kwds)
|
|
|
|
def clear(self):
|
|
self.__end = end = []
|
|
end += [None, end, end] # sentinel node for doubly linked list
|
|
self.__map = {} # key --> [key, prev, next]
|
|
dict.clear(self)
|
|
|
|
def __setitem__(self, key, value):
|
|
if key not in self:
|
|
end = self.__end
|
|
curr = end[1]
|
|
curr[2] = end[1] = self.__map[key] = [key, curr, end]
|
|
dict.__setitem__(self, key, value)
|
|
|
|
def __delitem__(self, key):
|
|
dict.__delitem__(self, key)
|
|
key, prev, next = self.__map.pop(key)
|
|
prev[2] = next
|
|
next[1] = prev
|
|
|
|
def __iter__(self):
|
|
end = self.__end
|
|
curr = end[2]
|
|
while curr is not end:
|
|
yield curr[0]
|
|
curr = curr[2]
|
|
|
|
def __reversed__(self):
|
|
end = self.__end
|
|
curr = end[1]
|
|
while curr is not end:
|
|
yield curr[0]
|
|
curr = curr[1]
|
|
|
|
def popitem(self, last=True):
|
|
if not self:
|
|
raise KeyError('dictionary is empty')
|
|
# Modified from original to support Python 2.4, see
|
|
# http://code.google.com/p/simplejson/issues/detail?id=53
|
|
if last:
|
|
key = reversed(self).next()
|
|
else:
|
|
key = iter(self).next()
|
|
value = self.pop(key)
|
|
return key, value
|
|
|
|
def __reduce__(self):
|
|
items = [[k, self[k]] for k in self]
|
|
tmp = self.__map, self.__end
|
|
del self.__map, self.__end
|
|
inst_dict = vars(self).copy()
|
|
self.__map, self.__end = tmp
|
|
if inst_dict:
|
|
return (self.__class__, (items,), inst_dict)
|
|
return self.__class__, (items,)
|
|
|
|
def keys(self):
|
|
return list(self)
|
|
|
|
setdefault = DictMixin.setdefault
|
|
update = DictMixin.update
|
|
pop = DictMixin.pop
|
|
values = DictMixin.values
|
|
items = DictMixin.items
|
|
iterkeys = DictMixin.iterkeys
|
|
itervalues = DictMixin.itervalues
|
|
iteritems = DictMixin.iteritems
|
|
|
|
def __repr__(self):
|
|
if not self:
|
|
return '%s()' % (self.__class__.__name__,)
|
|
return '%s(%r)' % (self.__class__.__name__, self.items())
|
|
|
|
def copy(self):
|
|
return self.__class__(self)
|
|
|
|
@classmethod
|
|
def fromkeys(cls, iterable, value=None):
|
|
d = cls()
|
|
for key in iterable:
|
|
d[key] = value
|
|
return d
|
|
|
|
def __eq__(self, other):
|
|
if isinstance(other, OrderedDict):
|
|
return len(self)==len(other) and \
|
|
all(p==q for p, q in zip(self.items(), other.items()))
|
|
return dict.__eq__(self, other)
|
|
|
|
def __ne__(self, other):
|
|
return not self == other
|