'For very large templates it can be useful to not render the whole
template at once but evaluate each statement after another and yield
piece for piece.  This method basically does exactly that and returns
a generator that yields one item after another as unicode strings.
It accepts the same arguments as :meth:`render`.'

def generate(self, *args, **kwargs):

    vars = dict(*args, **kwargs)
    try:
        for event in self.root_render_func(self.new_context(vars)):
            (yield event)
    except Exception:
        exc_info = sys.exc_info()
    else:
        return
    (yield self.environment.handle_exception(exc_info, True))
