Re: [Emacs-diffs] comment-cache 223d16f 2/3: Apply `comment-depth' text properties when calling `back_comment'.

[Andreas Röhler]

On 08.03.2016 19:30, Alan Mackenzie wrote:
> Hello, Stefan.
>
> On Tue, Mar 08, 2016 at 09:19:46AM -0500, Stefan Monnier wrote:
> > >      Apply `comment-depth' text properties when calling `back_comment'.
> > FWIW, I think if you want to speed up back_comment, a simpler approach
> > is to make it use syntax-ppss, which already implements a cache, and
> > will usually already have the cache filled for you.
> My changes might speed up back_comment, but that's not the prime reason
> for them.  Rather, I want utterly to expunge all the nonsense about
> parens in column 0.  That a high class editor such as Emacs should have
> problems with such parens is ludicrous and unacceptable.

Indeed. Thanks making this up again.

Also dropped use of syntax-ppss as not reliable. A cache simply doesn't 
make sense in this circumstance, as any previous insert might have 
changed the state.

See inside stuff like

       ;; Use OLD-PPSS if possible and close enough.

or

   syntax-ppss-toplevel-pos

Syntax must precede such notions like toplevel, can't depend on them.



Andreas