472f02f5af
git-svn-id: svn://svn.cy55.de/Zope3/src/cybertools/trunk@1516 fd906abe-77d9-0310-91a1-e0d9ade77398
85 lines
2.6 KiB
Python
85 lines
2.6 KiB
Python
#
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# Copyright (c) 2006 Helmut Merz helmutm@cy55.de
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#
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"""
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Dictionaries with multiple keys.
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$Id$
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"""
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_not_found = object()
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class MultiKeyDict(dict):
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def __init__(self, keylen=None, **kw):
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super(MultiKeyDict, self).__init__(**kw)
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self.keylen = keylen
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self.data = {}
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def __setitem__(self, key, value):
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assert type(key) is tuple
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if self.keylen is None:
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self.keylen = len(key)
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assert len(key) == self.keylen
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k0 = key[0]
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sub = None
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if len(key) > 1:
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sub = MultiKeyDict(self.keylen-1)
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sub[key[1:]] = value
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self.data[k0] = MultiKeyDictEntry(value, sub)
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def __getitem__(self, key):
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r = self.get(key, _not_found)
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if r is _not_found:
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raise KeyError(key)
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return r
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def get(self, key, default=None):
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assert type(key) is tuple
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assert len(key) == self.keylen
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k0 = key[0]
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rsub = _not_found
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r0 = self.data.get(k0, _not_found)
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if r0 is _not_found:
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r0 = self.getFallback(k0)
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if r0 is _not_found:
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return default
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if len(key) > 1:
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sub = r0.submapping
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rsub = sub.get(key[1:], _not_found)
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if rsub is _not_found:
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return default # !!! leads to backtracking !!!
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return rsub
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return rsub is _not_found and r0.value or rsub
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def getFallback(self, key):
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return self.data.get(None, _not_found)
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def getSubmappingFallback(self, key):
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return self.submapping.get(None, _not_found)
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def __repr__(self):
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return ('<MultiKeyDict %s; submapping: %s>'
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% (super(MultiKeyDict, self).__repr__(), `self.submapping`))
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class MultiKeyDictEntry(object):
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def __init__(self, value, submapping):
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self.value = value
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self.submapping = submapping
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