[squeak-dev] MethodFinder.Blocks
Thiede, Christoph
Christoph.Thiede at student.hpi.uni-potsdam.de
Wed Oct 16 09:55:32 UTC 2019
Hi Marcel,
as I see it, this Blocks check only restricts the possible hits, so removing it should not damage any existing functionality. (I am *not* talking about modifying Dangerous!)
And if you do
MethodFinder methodFor: {{#(1 2). [:x | Smalltalk saveSession. false]}.#()} "pls don't run this!"
you will surely expect the side effects to be executed?
> Just curious: what would be the block example for these examples?
MethodFinder methodFor: {{#(1 2). #even}. #(1)}. '(data1 reject: data2) '
MethodFinder methodFor: {{#(1 2). #yourself descending}. #(2 1)}. '(data1 sorted: data2) (data1 sort: data2) '
Hey, maybe we should make a small game of it? :-) GuessTheSelectorGame :D
Christoph
________________________________
Von: Squeak-dev <squeak-dev-bounces at lists.squeakfoundation.org> im Auftrag von Taeumel, Marcel
Gesendet: Mittwoch, 16. Oktober 2019 10:54 Uhr
An: gettimothy via Squeak-dev; squeak-dev at mail.squeak.org
Betreff: Re: [squeak-dev] MethodFinder.Blocks
Hi, Christoph.
The method finder (or selector browser) has a hard-coded list of possible results (or messages) to not trigger dangerous side effects. Any new feature, such as that "quasi higher-order-message" symbol , would have to be added. Sure. But keep compatiblility with block arguments. :-)
Just curious: what would be the block example for these examples?
MethodFinder methodFor: {{#(1 2). #even}. #(1)}
MethodFinder methodFor: {{#(1 2). #yourself descending}. #(2 1)}.
Especially the latter seems kind of cryptic to me.
Best,
Marcel
Am 14.10.2019 01:27:12 schrieb Thiede, Christoph <christoph.thiede at student.hpi.uni-potsdam.de>:
Hi all,
I just got irritated as I evaluated
MethodFinder methodFor: {{#(1 2). #even}. #(1)}
and got no hit.
This is because the MethodFinder stores an extra list of selector parameters that are assumed to require a block argument (Blocks) -- but nowadays this requirement is not given, as you can pass a Symbol, MessageSend, SortFunction or whatsoever, thanks to polymorphy. So (how) is this block check still relevant? If I remove it, I get the right hit and can do thinks like
MethodFinder methodFor: {{#(1 2). #yourself descending}. #(2 1)}.
Also, #ifError: will prevent any error thrown if the block does not match the selector.
Looking forward to your answers :)
Christoph
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