def _register_context_handler(parents, func):
name = func.__name__
parents = list(itertools.takewhile(lambda x: name in x.registry, parents))
if not parents:
return
ctx_handlers = parents[-1].context_handlers
for c in _get_ctx_dependencies(func):
for old in ctx_handlers[name][c]:
dr.add_ignore(old, c)
ctx_handlers[name][c].append(func)
def _register_context_handler(parents, component):
name = component.__name__
parents = list(itertools.takewhile(lambda x: name in x.registry, parents))
if not parents:
return
# If the new component handles a context, we need to tell the
# previously registered components that would have handled it to ignore it.
# The components that handle a context are registered on the highest class
# of the MRO list. This is so overrides work correctly even if a
# component isn't a direct sibling of the component it's overriding.
# instead of trying to unhook all of the dependencies, we just tell the
# previous handler of a context to ignore it.
ctx_handlers = parents[-1].context_handlers
for c in _get_ctx_dependencies(component):
for old in ctx_handlers[name][c]:
dr.add_ignore(old, c)
ctx_handlers[name][c].append(component)