[Cuis] Scoping rules for shared variables ?

[Peter van Rooijen]

Hi Nicolas,

On Tue, Jul 21, 2015 at 10:16 PM, Nicolas Cellier <
nicolas.cellier.aka.nice at gmail.com> wrote:


> Ah, you probably mean that you would not want the superclass pool
> dictionaries to be inherited, right?
>

Indeed they should not be inherited. If the variables are relevant for the
whole hierarchy, the place to put them is in the classPool.

But there is a problem with the class variables by themselves too, although
I always forget what it is. If you really want to know I can look it up of
course.

Cheers, Peter





>
>
> Nicolas
>
>
>> Cheers, Peter
>>
>> BTW Hannes, I'm not sure I would be able to change this in Dolphin, but
>> in the other dialects, probably. But like I said, there is no need, it is
>> Squeak (and Cuis) that's the odd one out.
>>
>> On Tue, Jul 21, 2015 at 3:36 AM, Juan Vuletich <juan at jvuletich.org>
>> wrote:
>>
>>> On 7/19/2015 6:01 PM, H. Hirzel wrote:
>>>
>>>> On 7/19/15, Peter van Rooijen<peter at aba-instituut.nl>  wrote:
>>>> ....
>>>>   I
>>>>
>>>>> recently changed the scoping rules for shared variables (I think
>>>>> they're
>>>>> done wrong in the base image). I could change what I wanted easily. So
>>>>> I
>>>>> think I am not in some outsider author group. Instead I am happy that I
>>>>> could change what I wanted without needing anyone's approval or
>>>>> cooperation.
>>>>>
>>>>
>>> Great!
>>>
>>>  A note:
>>>> This applies to any version / distribution of Smalltalk. But it means
>>>> that you have your own version of the core system.
>>>>
>>>> Could you elaborate on the issue of the shared variables, maybe it is
>>>> something to include in the core Cuis image?
>>>>
>>>> --Hannes
>>>>
>>>
>>> Agree. It would be nice to know.
>>>
>>> Cheers,
>>> Juan Vuletich
>>>
>>> _______________________________________________
>>> Cuis mailing list
>>> Cuis at jvuletich.org
>>> http://jvuletich.org/mailman/listinfo/cuis_jvuletich.org
>>>
>>
>>
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>>
>
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>

On Tue, Jul 21, 2015 at 10:16 PM, Nicolas Cellier <
nicolas.cellier.aka.nice at gmail.com> wrote:

>
>
> 2015-07-21 21:13 GMT+02:00 Peter van Rooijen <peter at aba-instituut.nl>:
>
>> Hi Juan, Hannes,
>>
>> since you asked: the other Smaltalks I have looked at (Dolphin, VA, VW,
>> ST/X, VSE, IIRC) already do it as I want it to work
>> (Squeak does it "wrong" so perhaps it's not really a Smalltalk
>> implementation)
>>
>> This is about the lookup logic when we see a name that is not a local
>> name (local to the block, method or object)
>>
>> To resolve it (i.e., determine if it is a valid reference to a shared
>> variable), this is the order of searching for the name:
>>
>> 1 pool dictionaries declared in this class (from left to right I presume
>> but I don't care so I haven't paid attention)
>> 2 classPool (i.e. the class variables defined in this class)
>> 3 classPools in superclass chain
>> 4 globals
>>
>> The code in Squeak (and Cuis) does something recursive in the lookup
>> logic when it should not, which is probably based on an incorrect
>> understanding of the lookup rules. I have to admit that it is not easy to
>> find how this should be done, I have studied the Blue Book and ANSI-98
>> Smalltalk standard (long long ago) and they were a bit fuzzy. But the logic
>> all the other dialects have also makes the most sense (to me) and works for
>> some "clever" stuff I do to make code 100% portable between dialects, so
>> that's how I like it to work.
>>
>>
> Ah, you probably mean that you would not want the superclass pool
> dictionaries to be inherited, right?
>
> Nicolas
>
>
>> Cheers, Peter
>>
>> BTW Hannes, I'm not sure I would be able to change this in Dolphin, but
>> in the other dialects, probably. But like I said, there is no need, it is
>> Squeak (and Cuis) that's the odd one out.
>>
>> On Tue, Jul 21, 2015 at 3:36 AM, Juan Vuletich <juan at jvuletich.org>
>> wrote:
>>
>>> On 7/19/2015 6:01 PM, H. Hirzel wrote:
>>>
>>>> On 7/19/15, Peter van Rooijen<peter at aba-instituut.nl>  wrote:
>>>> ....
>>>>   I
>>>>
>>>>> recently changed the scoping rules for shared variables (I think
>>>>> they're
>>>>> done wrong in the base image). I could change what I wanted easily. So
>>>>> I
>>>>> think I am not in some outsider author group. Instead I am happy that I
>>>>> could change what I wanted without needing anyone's approval or
>>>>> cooperation.
>>>>>
>>>>
>>> Great!
>>>
>>>  A note:
>>>> This applies to any version / distribution of Smalltalk. But it means
>>>> that you have your own version of the core system.
>>>>
>>>> Could you elaborate on the issue of the shared variables, maybe it is
>>>> something to include in the core Cuis image?
>>>>
>>>> --Hannes
>>>>
>>>
>>> Agree. It would be nice to know.
>>>
>>> Cheers,
>>> Juan Vuletich
>>>
>>> _______________________________________________
>>> Cuis mailing list
>>> Cuis at jvuletich.org
>>> http://jvuletich.org/mailman/listinfo/cuis_jvuletich.org
>>>
>>
>>
>> _______________________________________________
>> Cuis mailing list
>> Cuis at jvuletich.org
>> http://jvuletich.org/mailman/listinfo/cuis_jvuletich.org
>>
>>
>
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> http://jvuletich.org/mailman/listinfo/cuis_jvuletich.org
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>
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