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Re: Re: Re: strings with options - how do I do this?

by blakem (Monsignor)
on Feb 27, 2003 at 11:04 UTC ( #239061=note: print w/replies, xml ) Need Help??

in reply to Re: Re: strings with options - how do I do this?
in thread strings with options - how do I do this?

Good points... How about this:
use File::Glob qw(:glob); sub parseit { my $text = shift; $text =~ tr/[|]/{,}/; $text =~ s/([\\?*])/\\$1/g; map {s/\\([\\?*])/$1/g; $_} bsd_glob($text, GLOB_BRACE | GLOB_NOCHECK); }


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Re: Re: Re: Re: strings with options - how do I do this?
by Anonymous Monk on Feb 27, 2003 at 13:32 UTC
    thank you people ... that does it perfectly. I learnt my "something new" for today too.

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[Corion]: And on 5.20, the following also outputs no find:perl -wle 'for my $x ("\x{2000}".."\ x{1fffff}") { if( $x && ! length $x ) { warn qq(<$x>); warn length $x; die } }'
[Corion]: (this time on Unix)
[hippo]: Understood. I'll have to go through the code and see if it's doing anything fancy with ties, dual-vars or non-scalars. In the end, it's probably a bug though.
[Corion]: Aaah - you should be able to do this with overload, but I would hit somebody really hard if they constructed objects that are true but the empty string, and you not knowing about the domain knowledge where this makes sense
[Eily]: you could tie a variable into not having the same value each time, if you like to make people who try to debug your code facepalm
[Corion]: perl -wle 'package o; use overload q("") => sub {warn "str"; ""}, bool => sub{warn "bool"; 1}; package main; my $o={}; bless $o => o; print "Yay" if ($o && !length($o))'
[Corion]: But people writing such code should document the objects they construct and why it makes sense for an object to be invisible as string while being true in a boolean context
[hippo]: That's equal parts clever and horrendous.
[Eily]: the overload version wouldn't return true with "$x" && !length $x though, I guess

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