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

From: Vitalie Spinu
Subject: Re: Syntax tables for multiple modes [was: bug#22983: syntax-ppss returns wrong result.]
Date: Mon, 21 Mar 2016 15:20:33 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.0.91 (gnu/linux)

>> On Mon, Mar 21 2016 15:07, Dmitry Gutov wrote:

> On 03/21/2016 02:40 PM, Vitalie Spinu wrote:

>>> Strings? Indentation engines do not deal with strings, they deal with buffer
>>> contents. Having them handle this possibility would also amount to sharing a
>>> part of multi-mode logic.
>> Yeh. That's the sucky part. My hope is that BEFORE-STRING will be seldom
>> used.

> Then let's not add that to the API until we see a concrete need for it.

It might be good to not include these (prog-indentation-context including) in
emacs 25 release.

>> Performance is not a primary concern for indentation. Correctness and 
>> conceptual
>> cleanness is at a much higher stake here. My hope is that generic helper
>> functions can be optimized to re-use same temp buffer for multiple 
>> invocations
>> of calculate-indent-function.

> So, how about trying my alternative proposal first?

Sorry. What proposal do you mean?

>> Right. Those stale values won't occur in multi-modes because both syntax-ppss
>> and parse-partial-sexp will always operate on same hard-narrowed regions.

> We could only be sure of that for syntax-ppss calls in facilities that the
> multi-mode handles specially, like font-lock, syntax-propertize and
> indentation. Not so with any other functions the user could call.

I assume that multi-mode engine is advising syntax-ppss which I think it should.


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