On Apr 21, 2010, at 6:09 02PM, Peter Hugosson-Miller wrote:
> Hi all,
>
> So it's time for me to stop lurking and do some stuff. However, although I am
> an experienced Smalltalk programmer (VisualAge Smalltalk continuously since
> 1995), I am a complete newb when it comes to Pharo and Squeak, it's hard to
> find my way around, and it's going to take me some time to get up to speed.
>
> I'm working on a small improvement to the testing framework, using ideas that
> I have found to be very useful in my daily job over the past 15 years. Note
> that I am doing this from scratch, so that I don't accidentally steal
> anything that I've done in my work, but I know how it all works in VisualAge,
> so I feel sure that I'll eventually be able to find the corresponding classes
> and methods in Pharo.
>
> What I would like are a few hints, clues and nudges in the right direction
> for scenarios and questions that I will describe in this thread. What I
> *don't* want are full-blown solutions, because then I won't learn anything. I
> hope that some kind souls will be able to give me a little help in the
> beginning that will eventually bring me up to speed and let me be productive.
>
> So to start with, one scenario and one question:
>
> 1) I want to find or write a method on Process that will print a stack trace
> onto a supplied Stream. Ideally I'd like to be able to decide the start and
> stop depth of the trace, so for example if I know that the top 4 stack frames
> will always be uninteresting, I would want to be able to write something like
> this:
>
> Processor activeProcess printStackFrom: 5 to: 15 on: aStream.
>
> 2) What *exactly* is "thisContext"? It appears to be a reserved word in
> Pharo, just like the familiar "self", "super", "true", "false", "nil" that
> are always reserved in Smalltalk. I'd also like to get an idea of what it's
> good for, and if anyone can describe it in terms of something that is in
> VisualAge, that would be nice too :-)
>
> BTW, if this is not the appropriate place for a thread like this, then please
> tell me where I should put it (politely, of course :-p)
>
> --
> Cheers,
> Peter
> ________________
I haven't used VA, but for instance, 2) allows you to write 1) as:
Process >> printStackFrom: start to: end on: aStream
((thisContext stackOfSize: end) removeFirst: start; yourself )
do: [:each | each printOn: aStream. aStream nextPut: Character
cr].
;)
Cheers,
Henry
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