bug#65470: 29.1.50; js-ts-mode: regex pattern can cause incorrect parenthesis matching

[Theodor Thornhill]

Eli Zaretskii <eliz@gnu.org> writes:

>> Date: Wed, 23 Aug 2023 16:23:13 +0300
>> From: Dmitry Gutov <dmitry@gutov.dev>
>> 
>> On 23/08/2023 12:05, Augustin Chéneau (BTuin) wrote:
>> > 
>> > With the mode js-ts-mode, matching tokens (such as '()', '[]') can be
>> > incorrectly paired by `show-paren-mode`. This is trivially reproducible
>> > with this simple example:
>> > 
>> > (/foobar)/)
>> > 
>> > The first parenthesis is matched with the second one, which is inside a
>> > regular expression pattern (between slashes), and the last one is not
>> > paired.
>> > 
>> > The behavior should be the same as for string, the content of the regex
>> > pattern should have no influence on the structure of the code. The first
>> > parenthesis should match with the third one. Here, the first parenthesis
>> > is matched with the last one:
>> > 
>> > ("foobar)")
>> > 
>> > js-mode behaves correctly in both cases.
>> 
>> Sounds like js-ts-mode also needs a syntax-propertize-function, similar 
>> to c-ts-mode, ruby-ts-mode and rust-ts-mode.
>> 
>> Others (typescript-ts-mode?) probably need it as well, at least modes 
>> for those languages that have dedicated regexp or heredoc syntax.
>
> Would someone please add syntax-propertize-function in modes that need
> it?  I think this should be done on the emacs-29 branch.
>
> TIA

I'll add it to my list, but if someone will grab it that's fine, as I'm
a little short on time the next couple of weeks :-(

Theo