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# Copyright (c) 2018, Ansible Project
# Simplified BSD License (see licenses/simplified_bsd.txt or https://opensource.org/licenses/BSD-2-Clause)
from __future__ import absolute_import, division, print_function
__metaclass__ = type
"""
Modules in _utils are waiting to find a better home. If you need to use them, be prepared for them
to move to a different location in the future.
"""
def get_all_subclasses(cls):
'''
Recursively search and find all subclasses of a given class
:arg cls: A python class
:rtype: set
:returns: The set of python classes which are the subclasses of `cls`.
In python, you can use a class's :py:meth:`__subclasses__` method to determine what subclasses
of a class exist. However, `__subclasses__` only goes one level deep. This function searches
each child class's `__subclasses__` method to find all of the descendent classes. It then
returns an iterable of the descendent classes.
'''
# Retrieve direct subclasses
subclasses = set(cls.__subclasses__())
to_visit = list(subclasses)
# Then visit all subclasses
while to_visit:
for sc in to_visit:
# The current class is now visited, so remove it from list
to_visit.remove(sc)
# Appending all subclasses to visit and keep a reference of available class
for ssc in sc.__subclasses__():
if ssc not in subclasses:
to_visit.append(ssc)
subclasses.add(ssc)
return subclasses