Source

bloodhound-trac / trac / util / introspection.py

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#  or more contributor license agreements.  See the NOTICE file
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#  to you under the Apache License, Version 2.0 (the
#  "License"); you may not use this file except in compliance
#  with the License.  You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
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"""Helper functions for introspection functionality"""

def subclasses(cls):
    """recursively get subclasses of a class"""
    for sub in cls.__subclasses__():
        for subsub in subclasses(sub):
            yield subsub
        yield sub

def get_enabled_component_subclass(env, cls):
    """if the cls is not enabled, attempts to find a subclass which is"""
    if env.is_component_enabled(cls):
        return cls
    for subcls in subclasses(cls):
        if env.is_component_enabled(subcls):
            return subcls
    return None
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