Re: Unicode confusables and reordering characters considered harmful

[Andreas Schwab]

On Nov 03 2021, Eli Zaretskii wrote:

>> From: Stefan Monnier <monnier@iro.umontreal.ca>
>> Cc: Gregory Heytings <gregory@heytings.org>,  Eli Zaretskii <eliz@gnu.org>,
>>  Stefan Kangas <stefan@marxist.se>,  cpitclaudel@gmail.com,
>>  emacs-devel@gnu.org
>> Date: Wed, 03 Nov 2021 14:47:26 -0400
>> 
>> >> +  (aset buffer-display-table ?‪ [?→])
>> >> +  (aset buffer-display-table ?‫ [?←])
>> >> +  (aset buffer-display-table ?‭ [?→])
>> >> +  (aset buffer-display-table ?‮ [?←])
>> >> +  (aset buffer-display-table ?⁦ [?→])
>> >> +  (aset buffer-display-table ?⁧ [?←])
>> >> +  (aset buffer-display-table ?⁨ [?↓])
>> >> +  (aset buffer-display-table ?‬ [?↑])
>> >> +  (aset buffer-display-table ?⁩ [?↑])
>> >
>> > A perfect example of how legitimate use of these characters can mess up
>> > your source. :-)
>> 
>> FWIW, I think the source would be clearer if it used `?\u{CHARNAME}`
>> instead of the literal chars.
>
> Huh?  What's unclear in a line like this one:
>
>   (aset buffer-display-table ?‫ [?←])

Can you explain what `?([←?]' means?

Andreas.

-- 
Andreas Schwab, schwab@linux-m68k.org
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