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import urllib
from zope.interface import classProvides
from zope.interface import implements
from zope.location.location import located
from zope.location.location import LocationIterator
from zope.location.interfaces import ILocation
from repoze.bfg.interfaces import ITraverser
from repoze.bfg.interfaces import ITraverserFactory
def split_path(path):
if path.startswith('/'):
path = path[1:]
if path.endswith('/'):
path = path[:-1]
clean=[]
for segment in path.split('/'):
segment = urllib.unquote(segment) # deal with spaces in path segment
if not segment or segment=='.':
continue
elif segment == '..':
del clean[-1]
else:
clean.append(segment)
return clean
def step(ob, name, default):
if name.startswith('@@'):
return name[2:], default
if not hasattr(ob, '__getitem__'):
return name, default
try:
return name, ob[name]
except KeyError:
return name, default
_marker = ()
class NaiveTraverser(object):
classProvides(ITraverserFactory)
implements(ITraverser)
def __init__(self, root, request):
self.root = root
self.locatable = ILocation.providedBy(root)
self.request = request
def __call__(self, path):
root = self.root
path = split_path(path)
ob = self.root
name = ''
while path:
segment = path.pop(0)
segment, next = step(ob, segment, _marker)
if next is _marker:
name = segment
break
if self.locatable:
next = located(next, ob, segment)
ob = next
return ob, name, path
def find_interface(context, interface):
""" Return an object providing 'interface' anywhere in the parent
chain of 'context' or None if no object providing that interface
can be found in the parent chain """
for location in LocationIterator(context):
if interface.providedBy(location):
return location
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