Stefan Behnel added the comment:
What about this idea: instead of changing the internal C implementation, we
could provide a simple parser target wrapper class (say, "EventBuilder") that
the parser would simply recognise with isinstance(). Then it would unpack the
wrapped target and configure itself as it currently does. So you'd use it like
this:
target = EventBuilder(TreeBuilder())
parser = XMLParser(target=target)
parser.feed(some_xml_data)
print list(target.events())
I mean, it doesn't really matter if the implementation is a fake, as long as
the API is right. And the only API that the EventBuilder has is its events()
method that returns the iterator.
The EventBuilder implementation would then be
class EventBuilder:
def __init__(self, target=None):
if target is None:
target = TreeBuilder()
self._target = target
self._events = []
def events(self):
# existing code for distructive iteration over self._events goes
here
...
and the rest would be done by the XMLParser() constructor, i.e. it would
register the "_events" list in the expat callbacks. What do you think?
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<http://bugs.python.org/issue17741>
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