def length(self):
# I strongly recommend to reimplement this in your subclass
try:
enumerable = IEnumerableMapping(self.context)
except TypeError:
return u''
return len(enumerable)
def isMapping(self):
"""Is the object observed a mapping?
Mappings are those objects, which are dicts or provide
IEnumerableMapping.
"""
if isinstance(self.obj, types.DictType):
return True
return IEnumerableMapping.providedBy(self.obj)
def __iter__(self):
for key in self.context:
try:
yield self.aliaser and self.aliaser.alias(key) or key
except KeyError:
if IEnumerableMapping.providedBy(self.aliaser):
# an enumerable aliaser whitelists, we skip non-listed keys
continue
# no whitelisting and a KeyError on our internal data: that's
# bad! Most probably not triggered on _Node but a subclass
raise RuntimeError(u"Inconsist internal node state")
def __iter__(_next, self):
for key in _next(self):
try:
if self.aliaser:
yield self.aliaser.alias(key)
else:
yield key
except KeyError:
if IEnumerableMapping.providedBy(self.aliaser):
# an enumerable aliaser whitelists, we skip non-listed keys
continue
raise
def __iter__(_next, self):
for key in _next(self):
try:
if self.aliaser:
yield self.aliaser.alias(key)
else:
yield key
except KeyError:
if IEnumerableMapping.providedBy(self.aliaser):
# an enumerable aliaser whitelists, we skip non-listed keys
continue
raise
