[Pharo-project] [squeak-dev] Compiler pedantic about ifNotNil: argument
leves at elte.hu
Sun Oct 10 10:55:20 EDT 2010
On Sun, 10 Oct 2010, Randal L. Schwartz wrote:
>>>>>> "Igor" == Igor Stasenko <siguctua at gmail.com> writes:
> Igor> i am also missing:
> Igor> someThing ifTrue: 1 ifFalse: 0
> Down that path lies ambiguity though.
> If you had
> actionSymbol := aBoolean ifTrue: #doThis else: #doThat.
> do you want the symbol assigned, or performed?
The implementation is staightforward IMHO.
If the receiver expects a niladic block, then the argument is returned. If
the receiver can accept a niladic or a monadic block, then #cull: is sent
to the argument. If the receiver expects a monadic block, then #value: is
sent to the argument. This works perfercly with blocks.
Keyword selector symbols are equivalent with monadic blocks in this case,
so Symbol >> #cull: can be implemented as ^argument perform: self. For
other symbols #cull: is meaningless and #perform: will raise an error.
> Please don't add so much dwimmery here. I like it that Smalltalk is
> fairly strict with these basic forms.
> Randal L. Schwartz - Stonehenge Consulting Services, Inc. - +1 503 777 0095
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