def traverseName(obj, name, default=_marker, traversable=None, request=None):
"""Traverse a single step 'name' relative to the given object.
'name' must be a string. '.' and '..' are treated specially, as well as
names starting with '@' or '+'. Otherwise 'name' will be treated as a
single path segment.
You can explicitly pass in an ITraversable as the 'traversable'
argument. If you do not, the given object will be adapted to ITraversable.
'request' is passed in when traversing from presentation code. This
allows paths like @@foo to work.
Raises TraversalError if path cannot be found and 'default' was
not provided.
"""
further_path = []
if default is _marker:
obj = traversePathElement(obj, name, further_path,
traversable=traversable, request=request)
else:
obj = traversePathElement(obj, name, further_path, default=default,
traversable=traversable, request=request)
if further_path:
raise NotImplementedError('further_path returned from traverse')
else:
return obj
def zopeTraverser(object, path_items, econtext):
"""Traverses a sequence of names, first trying attributes then items.
"""
request = getattr(econtext, 'request', None)
path_items = list(path_items)
path_items.reverse()
while path_items:
name = path_items.pop()
object = traversePathElement(object, name, path_items,
request=request)
object = ProxyFactory(object)
return object
