From: Richard Stallman <rms@gnu.org>
To: David Kastrup <dak@gnu.org>
Cc: monnier@iro.umontreal.ca, emacs-devel@gnu.org
Subject: Re: Fwd: Bug in lisp indentation
Date: Wed, 18 Jul 2007 00:42:23 -0400 [thread overview]
Message-ID: <E1IB1Ml-0008PK-EK@fencepost.gnu.org> (raw)
In-Reply-To: <864pk3305t.fsf@lola.quinscape.zz> (message from David Kastrup on Tue, 17 Jul 2007 10:27:26 +0200)
> The main purpose of lisp-indent-region was to optimize reindenting
> of regions. This optimization made a big difference, way back when.
> Maybe it isn't necessary any more, but I'd like someone to try it
> on a not very fast computer and see.
Parsing arbitrarily far backward for every line is always going to
make for quadratic behavior.
I think what takes the time is parsing _down_ from the top of the
function. Finding the start of the defun is very fast by comparison,
at least for Lisp.
The parsing down is quadratic too. The question is whether this is
a noticeable delay in practice for common cases. Can someone who
uses a slow machine please check that?
I think we should try to come up with a general scheme where parsing
data can get cached and interpolated easily, so that
lisp-indent-region would basically be
(let ((indent-cache (make-indent-cache)))
(loop through region
(indent-line)))
It is a good idea in principle. One would need to design
this caching system. Would you like to try?
If that isn't done, and if just deleting lisp-indent-region leads to
annoying slowdowns, then the only other choice is to fix the bug in
lisp-indent-region.
Would someone please try that?
next prev parent reply other threads:[~2007-07-18 4:42 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-07-14 18:00 [lenst@lysator.liu.se: Bug in lisp indentation] Richard Stallman
2007-07-14 19:53 ` Bug in lisp indentation Thien-Thi Nguyen
2007-07-14 20:04 ` Stefan Monnier
2007-07-14 20:46 ` Thien-Thi Nguyen
2007-07-15 14:43 ` Lennart Staflin
2007-07-15 17:23 ` Thien-Thi Nguyen
2007-07-16 14:04 ` Lennart Staflin
2007-07-16 14:59 ` Thien-Thi Nguyen
2007-07-14 20:06 ` Thien-Thi Nguyen
2007-07-16 1:49 ` Fwd: " Stefan Monnier
2007-07-17 3:34 ` Richard Stallman
2007-07-17 8:27 ` David Kastrup
2007-07-17 17:00 ` Stefan Monnier
2007-07-18 4:42 ` Richard Stallman [this message]
2007-07-18 18:49 ` Stefan Monnier
2007-07-20 13:42 ` Richard Stallman
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