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Re: New hook before-region-change-functions wanted
From: |
Alan Mackenzie |
Subject: |
Re: New hook before-region-change-functions wanted |
Date: |
Mon, 11 Sep 2017 16:45:05 +0000 |
User-agent: |
Mutt/1.7.2 (2016-11-26) |
Hello, Richard.
On Sun, Sep 10, 2017 at 21:17:57 -0400, Richard Stallman wrote:
> > > The other approach has the virtue of being entirely internal. It will
> > > not require an announcement, or adding to the Lisp manual.
> > Yes. This other approach is slightly more difficult to debug with, but
> > not unreasonably so.
> Just from curiosity, why is it more difficult to debug with?
> Since it has no effect on behavior, and its only effect is to speed
> up some cases, I'd expect it to have no effect on debugging.
> Is there something I am missing?
As I said, the difference was small.
With the hook in place, the filling and use of the cache was entirely
disjoint from swapping the caches in and out - the former occurred on
calling syntax-ppss, the latter on the hook called from
widen/narrow-to-region.
Using the actual solution, the swapping in and out of the caches
occurred at the beginning of syntax-ppss (if needed), and NOT on
widen/n-t-r. So until I got used to it, I was calling n-t-r, then
forgetting a token invocation of syntax-ppss, and wondering why the
caches hadn't been swapped.
In that sense, the hook would have been a cleaner solution. A pity
about its overwhelming disadvantages.
> --
> Dr Richard Stallman
> President, Free Software Foundation (gnu.org, fsf.org)
> Internet Hall-of-Famer (internethalloffame.org)
> Skype: No way! See stallman.org/skype.html.
--
Alan Mackenzie (Nuremberg, Germany).
- Re: New hook before-region-change-functions wanted, (continued)
- Re: New hook before-region-change-functions wanted, Eli Zaretskii, 2017/09/08
- Re: New hook before-region-change-functions wanted, Dmitry Gutov, 2017/09/08
- Re: New hook before-region-change-functions wanted, John Wiegley, 2017/09/08
- Re: New hook before-region-change-functions wanted, Richard Stallman, 2017/09/08
- Re: New hook before-region-change-functions wanted, Andreas Röhler, 2017/09/12
Re: New hook before-region-change-functions wanted, Stefan Monnier, 2017/09/09