Re: lisp-mode: how to disable parentheses matching on non-ASCII '[({]' '[})]' UTF-8 parenthesis chars ?

[Eric Frederickson <ericfrederickson68@gmail.com>]

"Jason Vas Dias"<jason.vas.dias@ptt.ie> writes:

>  Good day -
>
>    How to get emacs LISP program editing modes to ignore
>    UTF-8 parentheses characters like '《' (\U300A) or :
>      10088	2768	(3 2)	❨	'MEDIUM LEFT PARENTHESIS ORNAMENT'
>      10089	2769	(3 2)	❩	'MEDIUM RIGHT PARENTHESIS ORNAMENT'
>      10090	276A	(3 2)	❪	'MEDIUM FLATTENED LEFT PARENTHESIS ORNAMENT'
>      10091	276B	(3 2)	❫	'MEDIUM FLATTENED RIGHT PARENTHESIS ORNAMENT'
>      10222	27EE	(5 1)	⟮	'MATHEMATICAL LEFT FLATTENED PARENTHESIS'
>      10223	27EF	(5 1)	⟯	'MATHEMATICAL RIGHT FLATTENED PARENTHESIS'
>      10629	2985	(3 2)	⦅	'LEFT WHITE PARENTHESIS'
>      10630	2986	(3 2)	⦆	'RIGHT WHITE PARENTHESIS'
>      11816	2E28	(5 1)	⸨	'LEFT DOUBLE PARENTHESIS'
>      11817	2E29	(5 1)	⸩	'RIGHT DOUBLE PARENTHESIS'
>      64830	FD3E	(1 1)	﴾	'ORNATE LEFT PARENTHESIS'
>      64831	FD3F	(1 1)	﴿	'ORNATE RIGHT PARENTHESIS'
>      12298	300A	(1 1)	《	'LEFT DOUBLE ANGLE BRACKET'
>      12299	300B	(1 1)	》	'RIGHT DOUBLE ANGLE BRACKET'
>      65113	FE59	(1 1)	﹙	'SMALL LEFT PARENTHESIS'
>      65114	FE5A	(1 1)	﹚	'SMALL RIGHT PARENTHESIS'
>      65288	FF08	(1 1)	（	'FULLWIDTH LEFT PARENTHESIS'
>      65289	FF09	(1 1)	）	'FULLWIDTH RIGHT PARENTHESIS'
>      65375	FF5F	(3 2)	｟	'FULLWIDTH LEFT WHITE PARENTHESIS'
>      65376	FF60	(3 2)	｠	'FULLWIDTH RIGHT WHITE PARENTHESIS'

Your problem (although I'm assuming this wouldn't be a problem for most users)
is that all the above characters are defined to be opening/closing delimiters in the
syntax table for elisp-mode. (You can view the syntax table for the current
major mode with "C-h s").

In order to disable their treatment as opening or closing delimiters, use the
modify-syntax-entry funtion as described above on this thread. For instance:

(modify-syntax-entry ?❨ "w")

to put MEDIUM-LEFT-PARENTHESIS-ORNAMENT in the word class instead of the
opening-delimeter class. Doing this for all the characters you specified will
give you your desired behavior. See this section of the Emacs wiki:

https://www.emacswiki.org/emacs/EmacsSyntaxTable#h5o-4

for information on how to put these types configurations in your init file so
that they will be in effect every time you enter elisp-mode.

Best,
Eric Frederickson

>    Please could some emacs guru let me know how the 'lisp-mode' based source
>    editing modes can be made to ignore / treat as normal characters such not-ascii-'(' and
>    not-ascii-')' characters and to NOT attempt to balance them or to
>    consider them parenthesis syntax ? No LISP parser I am using
>    considers them to be syntax.
>
>    It is really annoying to have to turn all parenthesis balancing off
>    when my lisp source code files might contain such valid unicode characters.
>
>    I am running Emacs 28.2 I built as RPM with modified Fedora emacs
>    spec file under Fedora Linux v36 x86_64 .
>
> Thanks & Best Regards,
> Jason