Re: [Pharo-project] About little magic to support understanding

Feb. 27, 2009

      Hello Stef,

i designed own little thingy to intercept any message sent to an
object, including #DNU.

See, if it can be useful for you.
As an example there is a subclass (CVMsgHandlingProxy) which i'm using
to write an inline code to handle messages right in place where i
creating a proxy:

superReceiver
	"lambda, when reducing , sends #perform:withArguments: ,
	and we doing trick by evaluating perform..inSuperClass"

	^ CVMsgHandlingProxy onMessage: [:msg |
		msg selector == #perform:withArguments: ifTrue: [
			self receiver
				perform: msg arguments first
				withArguments: msg arguments second
				inSuperclass: self receiver class superclass
		] ifFalse: [
			 self receiver perform: msg selector withArguments: msg arguments
		]
	]

what is cool in this method:

suppose you have a code like following:

proxy := (someObject asSuperReceiver).

and later you sending a messages to it:

proxy foo.

Now, the trick is, that in the end, a message #foo will be sent to
original 'someObject' , but using its superclass (same semantics, as
you using super foo).
What is cool in CVMsgHandlingProxy, that you don't need to declare a
separate class each time you need to have different proxy behavior..
you just write:

makeProxyFor: object
   ^ CVMsgHandlingProxy onMessage: [:msg | msg sentTo: object ]

2009/2/27 StÃ©phane Ducasse <stephane.ducasse@inria.fr>:
...
...
so what about Morph's abuse of includesSelector: would it be
confused by asking ProtoObject instance if it
understands #lalaland:
I have to think :)
Right now it freezes hard :)
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-- 
Best regards,
Igor Stasenko AKA sig.