Re: Font-lock of comments using comment tokens, does it work?

[tomas]

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On Sun, Jun 07, 2015 at 05:58:45AM +0200, Björn Lindqvist wrote:
> Ok so I finally almost figured it out. The key part was that you must
> invert the logic so that instead of "unmarking" in
> syntax-propertize-rules, you use a regexp that adds the comment
> starter property "<" to the matched strings. Something is bugged with
> the unmarking approach, it's like it stops looking when it found the
> comment character. Anyway:
> 
>     (syntax-propertize-rules
>        ("\\(^\\| \\|\t\\)\\(FOO\\|BAR\\)\\($\\| \\|\t\\)" (2 "<   ")))

Got it.

> Does almost exactly what I want. Amusingly enough the matching is
> case-INsensitive so bAR, Bar, foo, etc matches the regexp. But it's a
> small flaw which I can live with.

This is most probably related to the (buffer local) variable case-fold-search,
which controls whether the regexp search functions are case sensitive or not.
By default, it's set to t (that's what you usually expect interactively).

You could try to set this variable to nil and see whether it works better.

Alas, there doesn't seem to be a way to control that in the simple
syntax-propertize-rules -- possibly you'll have to go the way of
defining a syntax-propertize-function, where you can set this variable
dynamically for the relevant call.

Ducking around, here's a little snippet which might help to get you
started:

  <http://www.lunaryorn.com/feed.atom#hooking-into-syntactic-analyses>

HTH, regards
- -- tomás
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