[debbugs-tracker] bug#36923: closed (Combining Diacritical Marks are not Latin only)

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Your message dated Thu, 08 Aug 2019 00:44:49 +0300
with message-id <address@hidden>
and subject line Re: bug#36923: Combining Diacritical Marks are not Latin only
has caused the debbugs.gnu.org bug report #36923,
regarding Combining Diacritical Marks are not Latin only
to be marked as done.

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-- 
36923: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=36923
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> --- Begin Message ---
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> Subject: 
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> Combining Diacritical Marks are not Latin only
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> Date: 
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> Sun, 04 Aug 2019 23:40:38 +0300
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> User-agent: 
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> Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (x86_64-pc-linux-gnu)
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> The generated file lisp/international/charscript.el
> assigns the block “Combining Diacritical Marks” to the ‘latin’ script
> on the assumption that these characters are used only in Latin.
>
> But in fact according to e.g. https://en.wikipedia.org/wiki/Acute_accent
> the acute accent marks the stressed vowel of a word in several languages
> with alphabets based on the Latin, Cyrillic, and Greek scripts.
> In particular https://en.wikipedia.org/wiki/Cyrillic_script_in_Unicode
> mentions how characters from other blocks are used in Cyrillic script.
> Moreover, the Combining Diacritical Marks block also
> contains several characters from the Greek script:
> COMBINING GREEK PERISPOMENI, COMBINING GREEK KORONIS
> COMBINING GREEK DIALYTIKA TONOS, COMBINING GREEK YPOGEGRAMMENI
>
> I noticed this problem recently while helping to develop char-fold where
> GREEK SMALL LETTER IOTA combined with COMBINING GREEK DIALYTIKA TONOS was
> alarmingly highlighted as “mixed scripts” by markchars-mode from GNU ELPA.
>
> Of course, it's possible to add exceptions for characters in this block
> in markchars-mode.  But before doing this, I'm asking a confirmation
> whether Unicode data should be fixed in ‘char-script-table’, so e.g.
>
>   (aref char-script-table ?\N{COMBINING ACUTE ACCENT})
>
> could return
>
>   (latin greek cyrillic)
>
> instead of the current
>
>   latin
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> --- End Message ---
> --- Begin Message ---
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> Subject: 
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> Re: bug#36923: Combining Diacritical Marks are not Latin only
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>
>
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> Date: 
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> Thu, 08 Aug 2019 00:44:49 +0300
>
>
>
>
> User-agent: 
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> Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (x86_64-pc-linux-gnu)
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>
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> > Each base character has its canonical combining class attribute as
> > zero, so you could use
> >
> >    (get-char-code-property CHAR 'canonical-combining-class)
> >
> > to filter out those CHARs for which the value is non-zero.
> >
> > Alternatively, you could go by categories: base characters have the
> > ?. category set, combining characters have the ?^ category set.
> >
> > My recommendation is to use the canonical-combining-class property, as
> > it is a more direct way of doing this.
>
> Thanks, I fixed markchars-mode by using canonical-combining-class.
>
>
> --- End Message ---