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Re: Giving "text quotes" syntax in font-lock-syntax-table only

From: Stefan Monnier
Subject: Re: Giving "text quotes" syntax in font-lock-syntax-table only
Date: Tue, 02 Jun 2020 14:46:33 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux)

Sorry for not getting back to you sooner.
I see you (plural) decided to switch to highlighting math elements using
regexps rather than the syntax-table.  That sounds like a wise choice.

> This resembles the method to modify the major mode's syntax table
> (without setting `syntax-ppss-table'). It does eliminate the wrong
> fontification, but brings another problem in actual use cases of AUCTeX.
> When `syntax-ppss-table' is non-nil, all functions using `syntax-ppss'
> obey that syntax table, so they regard math expression $...$ as string
> constant. This can be problematic for cases like this:

Indeed.  What you could do if you still want to use syntax-tables rather
than regexp, is to add an entry to the beginning of `font-lock-keywords`
which does the equivalent of `font-lock-fontify-syntactically-region`
but without using `syntax-ppss` and using its own syntax-table.

Maybe this actually argues that `font-lock-fontify-syntactically-region`
should use `font-lock-syntax-table` rather than `syntax-ppss-table` and
should refrain from using `syntax-ppss` when that syntax-table is
different from that of syntax-ppss.


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