GNU bug report logs - #52263
Stale comment in xsd-regexp.el about Emacs not supporting Unicode

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Package: emacs; Severity: minor; Reported by: Stefan Kangas <stefan@HIDDEN>; Done: Stefan Kangas <stefankangas@HIDDEN>; Maintainer for emacs is bug-gnu-emacs@HIDDEN.
bug closed, send any further explanations to 52263 <at> debbugs.gnu.org and Stefan Kangas <stefan@HIDDEN> Request was from Stefan Kangas <stefankangas@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

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Subject: Re: bug#52263: Stale comment in xsd-regexp.el about Emacs not
 supporting Unicode
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Eli Zaretskii <eliz@HIDDEN> writes:

>> Interesting.  So the attached cleanup should be okay to install, then?
>
> Yes -- assuming that the 2nd argument is never a cons cell.  Which
> AFAICT it never is in these places.

I looked over all cases too, and my conclusion is also that the second
argument can never be a cons cell there.  So I installed the cleanup on
master.  Thanks.




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#52263; Package emacs. Full text available.

Message received at 52263 <at> debbugs.gnu.org:


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 (message from Stefan Kangas on Sun, 5 Dec 2021 18:34:32 +0100)
Subject: Re: bug#52263: Stale comment in xsd-regexp.el about Emacs not
 supporting Unicode
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> From: Stefan Kangas <stefan@HIDDEN>
> Date: Sun, 5 Dec 2021 18:34:32 +0100
> Cc: 52263 <at> debbugs.gnu.org
> 
> > Also, decode-char is now a no-op when the 1st arg is 'ucs'.
> 
> Interesting.  So the attached cleanup should be okay to install, then?

Yes -- assuming that the 2nd argument is never a cons cell.  Which
AFAICT it never is in these places.




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#52263; Package emacs. Full text available.

Message received at 52263 <at> debbugs.gnu.org:


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Eli Zaretskii <eliz@HIDDEN> writes:

> Also, decode-char is now a no-op when the 1st arg is 'ucs'.

Interesting.  So the attached cleanup should be okay to install, then?

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From: Eli Zaretskii <eliz@HIDDEN>
To: Stefan Kangas <stefan@HIDDEN>
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 (message from Stefan Kangas on Sat, 4 Dec 2021 14:07:46 +0100)
Subject: Re: bug#52263: Stale comment in xsd-regexp.el about Emacs not
 supporting Unicode
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> From: Stefan Kangas <stefan@HIDDEN>
> Date: Sat, 4 Dec 2021 14:07:46 +0100
> Cc: 52263 <at> debbugs.gnu.org
> 
> >> Is that correct?
> >
> > Probably.  The mule-Unicode-* stuff is definitely obsolete.  The only
> > thing that bothers me is what happens with eight-bit characters in the
> > XSD regexps -- are they allowed?  Emacs in general does allow them.
> > If xsd-regexp.el doesn't, that should be stated there.
> 
> Hmm, so probably more work is needed here than just removing the above
> comment.  There is a lot of non-trivial mule and conversion stuff going
> on in that library that might need a proper look by someone that knows
> this stuff well.

Mainly that file needs simplification: we in effect have a single
range of characters, with the possible exception of the codepoints
between 128 and 160.  Also, decode-char is now a no-op when the 1st
arg is 'ucs'.

I can offer help in those parts where you don't feel you understand
the issue well enough to make the simplifications.




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Subject: Re: bug#52263: Stale comment in xsd-regexp.el about Emacs not
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Eli Zaretskii <eliz@HIDDEN> writes:

>> I believe this comment in lisp/nxml/xsd-regexp.el can be removed as
>> Emacs supports Unicode now:
>>
>>     ;; The semantics of XSD regexps are defined in terms of Unicode.
>>     ;; Non-Unicode characters are not allowed in regular expressions and
>>     ;; will not match against the generated regular expressions.  A
>>     ;; Unicode character means a character in one of the Mule charsets
>>     ;; ascii, latin-iso8859-1, mule-unicode-0100-24ff,
>>     ;; mule-unicode-2500-33ff, mule-unicode-e000-ffff, eight-bit-control
>>     ;; or a character translatable to such a character (i.e a character
>>     ;; for which `encode-char' will return non-nil).
>>     ;;
>>     ;; Unfortunately, this means that this package is currently useless
>>     ;; for CJK characters, since there's no mule-unicode charset for the
>>     ;; CJK ranges of Unicode.  We should devise a workaround for this
>>     ;; until the fabled Unicode version of Emacs makes an appearance.
>>
>> Is that correct?
>
> Probably.  The mule-Unicode-* stuff is definitely obsolete.  The only
> thing that bothers me is what happens with eight-bit characters in the
> XSD regexps -- are they allowed?  Emacs in general does allow them.
> If xsd-regexp.el doesn't, that should be stated there.

Hmm, so probably more work is needed here than just removing the above
comment.  There is a lot of non-trivial mule and conversion stuff going
on in that library that might need a proper look by someone that knows
this stuff well.

Perhaps this bug should also be retitled accordingly.




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From: Eli Zaretskii <eliz@HIDDEN>
To: Stefan Kangas <stefan@HIDDEN>
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 (message from Stefan Kangas on Fri, 3 Dec 2021 10:37:10 -0800)
Subject: Re: bug#52263: Stale comment in xsd-regexp.el about Emacs not
 supporting Unicode
References: <CADwFkmkw-JudWWEdqdTeZ+BqsJ-7GWK-kMeb2MpM+5eSY4kjNQ@HIDDEN>
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> From: Stefan Kangas <stefan@HIDDEN>
> Date: Fri, 3 Dec 2021 10:37:10 -0800
> 
> I believe this comment in lisp/nxml/xsd-regexp.el can be removed as
> Emacs supports Unicode now:
> 
>     ;; The semantics of XSD regexps are defined in terms of Unicode.
>     ;; Non-Unicode characters are not allowed in regular expressions and
>     ;; will not match against the generated regular expressions.  A
>     ;; Unicode character means a character in one of the Mule charsets
>     ;; ascii, latin-iso8859-1, mule-unicode-0100-24ff,
>     ;; mule-unicode-2500-33ff, mule-unicode-e000-ffff, eight-bit-control
>     ;; or a character translatable to such a character (i.e a character
>     ;; for which `encode-char' will return non-nil).
>     ;;
>     ;; Unfortunately, this means that this package is currently useless
>     ;; for CJK characters, since there's no mule-unicode charset for the
>     ;; CJK ranges of Unicode.  We should devise a workaround for this
>     ;; until the fabled Unicode version of Emacs makes an appearance.
> 
> Is that correct?

Probably.  The mule-Unicode-* stuff is definitely obsolete.  The only
thing that bothers me is what happens with eight-bit characters in the
XSD regexps -- are they allowed?  Emacs in general does allow them.
If xsd-regexp.el doesn't, that should be stated there.




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#52263; Package emacs. Full text available.

Message received at submit <at> debbugs.gnu.org:


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Subject: Stale comment in xsd-regexp.el about Emacs not supporting Unicode
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Severity: minor

I believe this comment in lisp/nxml/xsd-regexp.el can be removed as
Emacs supports Unicode now:

    ;; The semantics of XSD regexps are defined in terms of Unicode.
    ;; Non-Unicode characters are not allowed in regular expressions and
    ;; will not match against the generated regular expressions.  A
    ;; Unicode character means a character in one of the Mule charsets
    ;; ascii, latin-iso8859-1, mule-unicode-0100-24ff,
    ;; mule-unicode-2500-33ff, mule-unicode-e000-ffff, eight-bit-control
    ;; or a character translatable to such a character (i.e a character
    ;; for which `encode-char' will return non-nil).
    ;;
    ;; Unfortunately, this means that this package is currently useless
    ;; for CJK characters, since there's no mule-unicode charset for the
    ;; CJK ranges of Unicode.  We should devise a workaround for this
    ;; until the fabled Unicode version of Emacs makes an appearance.

Is that correct?




Acknowledgement sent to Stefan Kangas <stefan@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs@HIDDEN. Full text available.
Report forwarded to bug-gnu-emacs@HIDDEN:
bug#52263; Package emacs. Full text available.
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