def _check_for_duplicate_wrappers(self):
"""Raise an error if there are duplicate wrappers. Can be overwritten by subclasses"""
if self.class_name() in [
wrapper.class_name() for wrapper in self._wrapper_stack
]:
raise error.DoubleWrapperError(
"Attempted to double wrap with Wrapper: {}".format(
self.class_name()))
def _ensure_no_double_wrap(self):
env = self.env
while True:
if isinstance(env, Wrapper):
if env.class_name() == self.class_name():
raise error.DoubleWrapperError("Attempted to double wrap with Wrapper: {}".format(self.__class__.__name__))
env = env.env
else:
break
