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Re: Syntax tables for multiple modes [was: bug#22983: syntax-ppss return

From: Stefan Monnier
Subject: Re: Syntax tables for multiple modes [was: bug#22983: syntax-ppss returns wrong result.]
Date: Mon, 21 Mar 2016 11:06:36 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.1.50 (gnu/linux)

> I have elaborated on all these in my other long reply. I would just
> conclude here that because both calculate-indent-function and
> prog-indentation-context try to solve same problem, they are bound to
> have overlapping parts. It's just that calculate-indent-function is
> more general, easier to understand for prog authors and it solves
> three problems at once - replacement of indent-line-function, removing
> extra prog-indentation-context/prog-widen and not exposing
> multi-mode complexities.

(from smie.el's point of view, they all seem pretty painful to support).

> Note also that the intention of the `hard-widen-limit` is to make it
> work seamlessly for all existing code that use widen.  While
> prog-indentation-context requires to teach every mode out there to use
> prog-widen instead of widen. This doesn't sound right at all.

The reason is that your suggestion risks breaking code since it changes
the behavior of `widen'.

Maybe the breakage would be extremely limited or even not exist at all,
in which case the tradeoff is probably worth it.  My gut feeling is that
it's too risky, but that's just my gut feeling.

Note also that most modes don't bother using widen, and search&replace
is pretty easy to do.  But if my fear is unfounded, then indeed it's
better to just change `widen' directly.


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