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134 lines
4.3 KiB
Python
134 lines
4.3 KiB
Python
###########################################################################
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#
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# Support code for the 'psyco.compact' type.
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from __future__ import generators
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try:
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from UserDict import DictMixin
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except ImportError:
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# backported from Python 2.3 to Python 2.2
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class DictMixin:
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# Mixin defining all dictionary methods for classes that already have
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# a minimum dictionary interface including getitem, setitem, delitem,
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# and keys. Without knowledge of the subclass constructor, the mixin
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# does not define __init__() or copy(). In addition to the four base
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# methods, progressively more efficiency comes with defining
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# __contains__(), __iter__(), and iteritems().
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# second level definitions support higher levels
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def __iter__(self):
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for k in self.keys():
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yield k
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def has_key(self, key):
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try:
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value = self[key]
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except KeyError:
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return False
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return True
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def __contains__(self, key):
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return self.has_key(key)
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# third level takes advantage of second level definitions
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def iteritems(self):
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for k in self:
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yield (k, self[k])
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def iterkeys(self):
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return self.__iter__()
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# fourth level uses definitions from lower levels
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def itervalues(self):
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for _, v in self.iteritems():
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yield v
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def values(self):
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return [v for _, v in self.iteritems()]
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def items(self):
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return list(self.iteritems())
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def clear(self):
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for key in self.keys():
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del self[key]
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def setdefault(self, key, default):
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try:
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return self[key]
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except KeyError:
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self[key] = default
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return default
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def pop(self, key, *args):
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if len(args) > 1:
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raise TypeError, "pop expected at most 2 arguments, got "\
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+ repr(1 + len(args))
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try:
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value = self[key]
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except KeyError:
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if args:
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return args[0]
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raise
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del self[key]
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return value
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def popitem(self):
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try:
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k, v = self.iteritems().next()
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except StopIteration:
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raise KeyError, 'container is empty'
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del self[k]
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return (k, v)
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def update(self, other):
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# Make progressively weaker assumptions about "other"
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if hasattr(other, 'iteritems'): # iteritems saves memory and lookups
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for k, v in other.iteritems():
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self[k] = v
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elif hasattr(other, '__iter__'): # iter saves memory
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for k in other:
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self[k] = other[k]
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else:
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for k in other.keys():
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self[k] = other[k]
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def get(self, key, default=None):
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try:
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return self[key]
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except KeyError:
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return default
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def __repr__(self):
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return repr(dict(self.iteritems()))
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def __cmp__(self, other):
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if other is None:
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return 1
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if isinstance(other, DictMixin):
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other = dict(other.iteritems())
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return cmp(dict(self.iteritems()), other)
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def __len__(self):
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return len(self.keys())
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###########################################################################
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from _psyco import compact
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class compactdictproxy(DictMixin):
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def __init__(self, ko):
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self._ko = ko # compact object of which 'self' is the dict
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def __getitem__(self, key):
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return compact.__getslot__(self._ko, key)
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def __setitem__(self, key, value):
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compact.__setslot__(self._ko, key, value)
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def __delitem__(self, key):
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compact.__delslot__(self._ko, key)
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def keys(self):
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return compact.__members__.__get__(self._ko)
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def clear(self):
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keys = self.keys()
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keys.reverse()
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for key in keys:
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del self[key]
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def __repr__(self):
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keys = ', '.join(self.keys())
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return '<compactdictproxy object {%s}>' % (keys,)
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