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Postings from March 2016
On 6 March 2016 at 10:59, Aristotle Pagaltzis <pagaltzis@gmx.de> wrote:
> * Father Chrysostomos via RT <perlbug-followup@perl.org> [2016-03-05 20:10]:
>> On Sat Mar 05 10:14:48 2016, perl.p5p@rjbs.manxome.org wrote:
>> > $x = "good job";
>> > @y = qqw( $x hunter );
>> >
>> > Is @y now ('good', 'job', 'hunter') or ('good job', 'hunter')?
>> > I would think the latter.
>>
>> I would have assumed the former. So I suppose it’s not obvious. BTW,
>> this does the former:
>>
>> $x = "good job";
>> @y = < $x hunter >;
>
> I prefer the former. So much so, in fact, that I don’t see any point in
> the feature if it does the latter. Because that result is already easy
> to achieve in several ways – starting with this very conventional, very
> boring, nobody-will-ever-scratch-their-head-about-it approach:
>
> @y = split ' ', "$x hunter";
>
> But a list in which variable values are interpolated yet atomic requires
> lots of syntactic ceremony using currently available means:
>
> @subdir = ( "$prefix/foo", "$prefix/bar", "$prefix/baz" );
>
> Consider how much nicer that would be if you got to leave out all those
> quotes and separators:
>
> @subdir = qqw( $prefix/foo $prefix/bar $prefix/baz );
>
> A qqw() that splits after interpolating would deprive us of that.
>
> So I think it must work that way or else there’s no point in bothering.
>
> While we’re at it – I would also prefer qqw() to allow comments, and/but
> allow backslashing whitespace and octothorpes to demote them from syntax
> to string content. Oh, and please – no qw()-style warnings about commas.
>
> Regards,
What would this do?:
$prefix = "/some/path/with a space/";
@y = qqw{ $prefix/hunter $prefix/bar };
Your description so far indicates that the output would be
( '/some/path/with' , 'a' , 'space/hunter' )
etc.
For clarity, we need a description of the 2 behaviours other than
"former" or "Latter" because backtracking to
work out which one we're talking about is kinda confusing.
expanding-qqw: variables with spaces in them are interpolated into being lists
preserving-qqw: variables with spaces in them are treated as
syntactically atomic and indivisible, and any spaces in them are
treated as non-spaces for the purpose of the qqw construct, and only
literal spaces in qqw itself is a separator
--
Kent
KENTNL - https://metacpan.org/author/KENTNL
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