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Migrating from font-lock-syntactic-keywords to syntax-propertize-functio
From: |
Tassilo Horn |
Subject: |
Migrating from font-lock-syntactic-keywords to syntax-propertize-function |
Date: |
Tue, 12 May 2020 12:15:59 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) |
Hi all,
I want to convert some old fontification code from using the now
obsolete `font-lock-syntactic-keywords' variable to using a custom
`syntax-propertize-function'.
Looking at examples inside Emacs itself, it seems the way to go is using
something like
(defun my-make-syntax-propertize-function ()
(syntax-propertize-rules
;; My rules here.
))
and then
(setq-local syntax-propertize-function
(my-make-syntax-propertize-function))
when setting up fontification.
Now I have two questions:
1. With `font-lock-syntactic-keywords', a MATCH-HIGHLIGHT could have the
form (SUBEXP SYNTAX OVERRIDE LAXMATCH) but with
`syntax-propertize-rules' only (NUMBER SYNTAX) is allowed where
SUBEXP and NUMBER have the same meaning. So how does one convert
entries which use OVERRIDE and/or LAXMATCH to the new mechanism? (I
don't use LAXMATCH, so that's not too important.)
2. Some of my syntax rules are not static, so I cannot provide a fixed
set of rules to `syntax-propertize-rules'. Is there anything better
than using `eval' like
(defun my-make-syntax-propertize-function ()
(eval
`(syntax-propertize-rules
,@(mapcar
#'my-convert-legacy-syntactic-keywords
(my-compute-syntactic-keywords)))))
or should I prefer writing a manual `syntax-propertize-function'?
Bye,
Tassilo
- Migrating from font-lock-syntactic-keywords to syntax-propertize-function,
Tassilo Horn <=