Hi, I'm afraid this is not specified. There's no
language specification (*) as such of Pharo or any
other available smalltalk - at least not that I know
(prove me if I'm wrong).
Order in which subexpressions are evaluated is rarely specified.
IIRC, JVM Spec doesn't specify it either.
If the question was rather "How does it work in current Pharo
implementation?", then it's easy to check, just add some sideffects
to subexpressions (like Transcript show) and see in what order
they're executed :-)
(*) Specification in a sense of Java Language Spec,
C# Language Specification, C99 Spec and so on.
Jan
On Wed, 2017-01-11 at 16:16 -0800, James Ladd wrote:
> Hi Pharo People,
>
> I know Smalltalk has precedence rules when subexpressions () are
> involved.
>
> 2 + ( (3 * 4) - 1 )
> evaluated last ( (evaluated first) evaluated second )
>
> That is the inner most subexpression is evaluated first.
>
> Given the following made up expression for the purposes of my
> question:
>
> self at: (self offset) - 1 put: (2 * (12 / 4)).
>
> Are there precedence rules for the subexpressions that are part of
> the
> keyword expression?
> ie: Should (self offset) - 1 be evaluated before (2 * (12 / 4)).
>
> My thinking is that with keywords the arguments are evaluated left to
> right
> - that is
> at: before put: but within each the regular subexpression precedence
> applies?
>
> - James.
>
>
>
>
>
>
> --
> View this message in context: http://forum.world.st/subexpression-pre
> cedence-tp4929398.html
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> Nabble.com.
>
