[PEAK] Circular class adapters..

[Bob Ippolito]

I have a use case where I'd like to have a class adapter chain that can  
be circular in some cases, such as:

from protocols import advise, Interface, Adapter
class IFoo(Interface):
     pass

class IBar(Interface):
     pass

class IBaz(Interface):
     pass

class AFooBar(Adapter):
     advise(instancesProvide=[IBar], asAdapterForProtocols=[IFoo])

class ABarBaz(Adapter):
     advise(instancesProvide=[IBaz], asAdapterForProtocols=[IBar])

class ABazFoo(Adapter):
     advise(instancesProvide=[IFoo], asAdapterForProtocols=[IBaz])

class Foo(object):
     advise(classProvides=[IFoo])

class Bar(object):
     advise(classProvides=[IBar])

class Baz(object):
     advise(classProvides=[IBaz])

How do I make this work?  Is it not possible, or is this a bug in  
PyProtocols?  With 0.9.2, I get this nasty traceback:

Traceback (most recent call last):
   File "./proto.py", line 20, in ?
     class Foo(object):
   File  
"/System/Library/Frameworks/Python.framework/Versions/2.3/lib/ 
python2.3/site-packages/protocols/advice.py", line 230, in advise
     return callback(newClass)
   File  
"/System/Library/Frameworks/Python.framework/Versions/2.3/lib/ 
python2.3/site-packages/protocols/api.py", line 219, in callback
     provides=classProvides, doesNotProvide=classDoesNotProvide
   File  
"/System/Library/Frameworks/Python.framework/Versions/2.3/lib/ 
python2.3/site-packages/protocols/api.py", line 159, in adviseObject
     declareAdapterForObject(proto, NO_ADAPTER_NEEDED, ob)
----- cut, it's pages and pages long -------
   File  
"/System/Library/Frameworks/Python.framework/Versions/2.3/lib/ 
python2.3/site-packages/protocols/classic.py", line 207, in  
declareProvides
     if updateWithSimplestAdapter(self.reg, protocol, adapter, depth):
   File  
"/System/Library/Frameworks/Python.framework/Versions/2.3/lib/ 
python2.3/site-packages/protocols/adapters.py", line 174, in  
updateWithSimplestAdapter
     new = minimumAdapter(old,adapter,oldDepth,depth)
RuntimeError: maximum recursion depth exceeded

-bob