Hi edouard

I will check as soon as I get some time.

I'm new on this mailing list, this is my first mail :-)

welcome

I'm a student from University of Lille (France). I'm studying this tutorial (I'm using Pharo 4 but it seems not to be a problem): http://sdmeta.gforge.inria.fr/Teaching/ObjVLisp/ObjV.pillar.pdf. I'm working with the "ObjVLispSkeleton-StephaneDucasse.1" image loaded from this repository:

MCSmalltalkhubRepository

owner: 'StephaneDucasse'

project: 'ObjVLispSkeleton'

user: ''

password: ''

I'm stuck at "Method Lookup" p11. First, it seems that unit tests "testNilWhenErrorInLookup" and "testRaisesErrorSendWhenErrorInLookup" are not provided,

Mark if you read this mail. Did you get problem when you did it?

thus I'm not sure that I'm working with the right image (everything was fine until p11 though). Then, the "lookup: selector" is not provided neither.

Not providing lookup: is ok since you have to define it. I will look for the tests in my version.

While there is another method named "lookup: selector from: anObjObject", I can't figure out what I'm supposed to do with the second parameter.

What you should see is that the second argument is is provided here because when you raise an error, you should send a messageNotUnderstood
and this message should be sent to the original object that received the message and not the class where the method was found.
So lookup will use the receiver to walk through the inheritance chain and the from: argument in case of error

Here is what I would do:

lookup: selector

"look for the method named <selector> starting in the receiver. 

The lookup is done for a message sent to <anObjObject>. self is an objClass"

^ self objMethodDict

at: selector

ifAbsent: [ self objSuperclassId ifNotNil: [ self objSuperclass lookup: selector ] ]

what do you return when you do not find the class