possible bug in perl "\u" string processing #15517
Comments
From @jmdhThe following bug report was sent to Debian. I don't believe it is specific to Debian, and have no expertise in the area, so I am forwarding without further comment. It was reported against Debian perl 5.22.2-3, for which perl -V output is available[1] and I was also able to reproduce it against our perl 5.24.0 build. The following might be a bug in how Perl uppercases strings as in e.g.: perlop(1) already documents, that in Unicode context, this can result Anyway, when in perl I do e.g.: Now IMO that's an error, \u says "titlecase (not uppercase!) next character Cheers, [0] Not sure if this is still the case in most recent versions, as there [1] Summary of my perl5 (revision 5 version 22 subversion 2) configuration: Characteristics of this binary (from libperl): |
From @maukeAm 15.08.2016 um 23:14 schrieb Dominic Hargreaves (via RT):
This is not specific to \u. ucfirst("ß") also returns "Ss", which makes -- |
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The RT System itself - Status changed from 'new' to 'open' |
From @cpansproutOn Mon Aug 15 14:14:57 2016, dom wrote:
I.e., titlecase, not capitalization.
But you did not ask for capitalization, but for titlecase.
I think it should result in Ss, because that is the titlecase version of ß. Karl Williamson should be able to confirm whether I am right. -- Father Chrysostomos |
From @cpansproutOn Mon Aug 15 14:27:49 2016, sprout wrote:
I was a bit sloppy with my wording there, because ‘capitalization’ in English usually means what geeks call ‘titlecase’. So: You asked for capitalization and got exactly that. -- Father Chrysostomos |
From @khwilliamsonOn 08/15/2016 03:27 PM, Father Chrysostomos via RT wrote:
It is deliberate. Consider the name "titlecase". It means how a title One would not have a word in a title that was "SSisch" But I'm told that this situation would never come up in natural German. The Unicode Standard has not changed the capitalization of ß with the |
From zefram@fysh.orgDominic Hargreaves wrote:
unicore/SpecialCasing.txt has # # The German es-zed is special--the normal mapping is to SS. So it's deliberate, but a known funny case.
That one's even funnier. It's so rarely used that it doesn't count as -zefram |
From @khwilliamsonRejecting, as Zefram pointed out the behavior is explicitly what The Unicode Standard specifies. |
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@khwilliamson - Status changed from 'open' to 'rejected' |
From eric.herman@booking.comOn 16-08-16 00:03, Karl Williamson wrote:
This may not come up in German, it will come up at least some in dutch. For example the IJsselmeer lake. https://en.wikipedia.org/wiki/IJ_%28digraph%29#Capitalisation It should be noted, however, that the dutch U+0132 'IJ' and U+0133 'ij' I have no good idea of how to correctly handle title case for words -- |
From zefram@fysh.orgEric Herman via perl5-porters wrote:
With different characters that have their own capitalisation rules.
Unicode can't handle that automatically. One would need a -zefram |
From @TuxOn Tue, 16 Aug 2016 15:24:39 +0100, Zefram <zefram@fysh.org> wrote:
Note that the Dutch law has banished the use of the IJ and ij ligatures Does that help at all?
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From @demerphqOn 16 August 2016 at 17:10, H.Merijn Brand <h.m.brand@xs4all.nl> wrote:
Not really. If they pass a law that means that Unicode can't do their Yves |
Migrated from rt.perl.org#128950 (status was 'rejected')
Searchable as RT128950$
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