GNU bug report logs - #17222
24.3; In f90-mode variables declared in continuation lines are not colored.

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From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Mattias Engdegård <mattiase <at> acm.org>
Cc: Luca Cartasegna <cartasegna.luca <at> gmail.com>, 17222 <at> debbugs.gnu.org
Subject: bug#17222: 24.3; In f90-mode variables declared in continuation lines are not colored.
Date: Tue, 17 May 2022 19:32:11 +0200

Mattias Engdegård <mattiase <at> acm.org> writes:

> part at the end is a potential empty-string repetition that indicates an ambiguity which we'd like to remove.
> What is the desired grammar here? Moving to rx for clarity, the above snippet means
>
> (+ (* (not (in "\n!&")))
>   (? "&\n"))
>
> What about rewriting it as
>
> (: (* (not (in "\n!&")))
>   (* "&\n"
>      (* (not (in "\n!&")))))
>
> which should be equivalent but unambiguous?

Yes, I think that's correct.

> However there may be something more fundamentally wrong with the original change, because it only seems to work for me after loading a file, not when writing the code incrementally. More precisely, when I've typed
>
> program main
>  integer :: alpha, &&
>
> in a new buffer then everything looks correctly coloured, but if I add
>
>   beta
>
> to the next line then it isn't fontified at all. Saving and reloading the buffer helps. Can you confirm?

Yes.  I had forgotten all about the rules for multiline font locking
(i.e., (elisp)Multiline Font Lock).  So I think my changes here were
basically misguided, and this should be implemented in a totally
different way.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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