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class Continue:
"""
This class is a singleton (never meant to be instantiated) that
represents a kind of no-op return from a class.
"""
def __init__(self):
assert False, (
"Continue cannot be instantiated (use the class object "
"itself)")
def wrap_func(func):
name = func.__name__
def replacement_func(actor, *args, **kw):
# @@: It's really more of an "inner_value" than "next_method"
kw['next_method'] = func
result = raise_event('start_%s' % name, actor, *args, **kw)
del kw['next_method']
if result is Continue:
value = func(actor, *args, **kw)
else:
return result
result = raise_event('end_%s' % name, actor, value, *args, **kw)
if result is Continue:
return value
return result
replacement_func.__name__ = name
return replacement_func
def raise_event(name, actor, *args, **kw):
for listener in actor.listeners:
value = listener(name, actor, *args, **kw)
if value is not Continue:
return value
return Continue
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