Re: [Pyobjc-dev] How do you write category code?

[Ronald O. <ron...@ma...>]

On 28-jul-04, at 20:26, b.bum wrote:

> On Jul 28, 2004, at 11:16 AM, Bob Ippolito wrote:
>> On Jul 28, 2004, at 2:08 PM, Fortepianissimo wrote:
>>> Ok another newbie question: how do I write category code using 
>>> PyObjC?
>>> Searched documentation but didn't find anything...
>>
>> Painfully, with objc.classAddMethods(...).  I'd suggest not doing it 
>> at all unless you absolutely have to, until we have a better syntax 
>> for it (a metaclass mixin or something).
>
> How about something like the following.   I like the second one better.
>
> class NSObject(PyObjCAsCategory):
> 	pass
>
> Or:
>
> class MyCategory(ObjCCategory, NSObject):
> 	pass

class MyCategory (objc.category, NSObject):
	pass

I don't really like this syntax, the decorator syntax would be better 
(when they ever get around choosing and implementing one...) but that 
would have the wrong semantics:

[ objc.category ]
class MyCategory (NSObject):
	pass

or

@objc.category
class MyCategory (NSObject):
	pass


BTW. If anyone wants to have a decorator a lot: Phillip J. Eby  has 
written an implementation of the first syntax in pure python, it seems 
to be part of PEAK.
>
> ---
>
> objc.classAddMethods() serves a different purpose than categories.

classAddMethods is as close to categories as we get :-). It's more 
powerful than objective-C categories, but that can't be helped.

Ronald
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