c2df42555e
git-svn-id: svn://svn.cy55.de/Zope3/src/cybertools/trunk@2516 fd906abe-77d9-0310-91a1-e0d9ade77398
120 lines
3.5 KiB
Python
120 lines
3.5 KiB
Python
#
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# Copyright (c) 2008 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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Building flexible hierarchical object structures with XML-like
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elements.
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$Id$
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"""
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from cybertools.util.jeep import Jeep
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_not_found = object()
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class Element(dict):
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typeName = 'Element'
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posArgs = ('name',)
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def __init__(self, namespace, name, collection=None, parent=None):
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self.namespace = namespace
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self.name = name
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self.collection = collection
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self.parent = parent
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self.children = Jeep()
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def __call__(self, *args, **kw):
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elem = self.__class__(self.namespace, '')
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for idx, v in enumerate(args):
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if idx < len(self.posArgs):
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elem[self.posArgs[idx]] = v
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for k, v in kw.items():
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elem[k] = v
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elem.name = elem.get('name')
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if not elem.name:
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elem.name = self.name
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if self.collection is not None:
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self.collection.append(elem)
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return elem
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def __getitem__(self, key):
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if isinstance(key, (list, tuple)):
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return tuple(self[k] for k in key)
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elif isinstance(key, Element):
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self.children.append(key)
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return key
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elif isinstance(key, (int, long, basestring)):
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return self.children[key]
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else:
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raise KeyError(key)
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def __getattr__(self, key):
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result = self.get(key, _not_found)
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if result is _not_found:
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raise AttributeError(key)
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return result
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def __iter__(self):
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return iter(self.children)
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def __str__(self):
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return self.name
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def __repr__(self):
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return "<%s '%s'>" % (self.typeName, self.name)
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class AutoElement(Element):
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typeName = 'AutoElement'
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def __call__(self, *args, **kw):
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if self.collection is None:
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elem = self
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else:
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elem = self.__class__(self.namespace, '')
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self.collection.append(elem)
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for idx, v in enumerate(args):
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if idx < len(self.posArgs):
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elem[self.posArgs[idx]] = v
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for k, v in kw.items():
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elem[k] = v
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elem.name = elem.get('name')
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if not elem.name:
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elem.name = self.name
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return elem
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def __getattr__(self, key):
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result = self.get(key, _not_found)
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if result is _not_found:
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result = self.__class__(self.namespace, key, parent=self)
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self[key] = result
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return result
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def __getitem__(self, key):
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try:
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return super(AutoElement, self).__getitem__(key)
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except KeyError:
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if isinstance(key, basestring):
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result = self.__class__(self.namespace, key, parent=self)
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self.children[key] = result
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return result
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else:
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raise KeyError(key)
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