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Re: Patch: Syntax and Hard Newlines
From: |
Stefan Monnier |
Subject: |
Re: Patch: Syntax and Hard Newlines |
Date: |
Tue, 28 Nov 2006 23:57:04 -0500 |
User-agent: |
Gnus/5.11 (Gnus v5.11) Emacs/22.0.91 (gnu/linux) |
> many times so that got a Perl file of 268274172 bytes (257 MB). I
> then evaluated the following forms:
[...]
> Can I conclude from this result that `parse-sexp-lookup-properties'
> has no effect over syntax parsing?
I believe so, yes.
Although I wonder why you did
(let (old-time
time-diff
(parse-sexp-lookup-properties nil))
(save-window-excursion
(switch-to-buffer "1.pl")
(font-lock-mode -1)
(goto-char 268273054)
(jit-lock-mode nil)
(font-lock-mode 1)
(setq old-time (current-time))
(parse-partial-sexp 1 (point))
(setq time-diff (time-subtract (current-time)
old-time)))
rather than
(with-current-buffer (find-file-noselect "1.pl")
(font-lock-mode -1)
(setq font-lock-support-mode nil)
(font-lock-mode 1)
(let ((old-time (current-time))
(parse-sexp-lookup-properties nil))
(parse-partial-sexp (point-min) (point-max))
(time-subtract (current-time) old-time)))
The main difference is that:/ your code did:
- misused switch-to-buffer and generally fiddled unnecessarily with windows
- failed to disable jit-lock, so the buffer probably had no syntax-table
(or face) property set anywhere while running parse-partial-sexp.
- did not bind parse-sexp-lookup-properties right before running
parse-partial-sexp which is safer: perl-mode sets
parse-sexp-lookup-properties via font-lock-defaults, so your let-binding
of parse-sexp-lookup-properties to nil outside may be overridden when
turning on font-lock-mode.
But I believe that this did not affect your measurements because
font-lock-mode had been turned ON before, so when you turned it on the
second time, font-lock-set-defaults didn't do anything.
Stefan
- Re: Patch: Syntax and Hard Newlines, (continued)
- Re: Patch: Syntax and Hard Newlines, Richard Stallman, 2006/11/19
- Re: Patch: Syntax and Hard Newlines, Stefan Monnier, 2006/11/19
- Re: Patch: Syntax and Hard Newlines, Richard Stallman, 2006/11/20
- Re: Patch: Syntax and Hard Newlines, Herbert Euler, 2006/11/20
- Re: Patch: Syntax and Hard Newlines, Richard Stallman, 2006/11/22
- Re: Patch: Syntax and Hard Newlines, Herbert Euler, 2006/11/22
- Re: Patch: Syntax and Hard Newlines, Richard Stallman, 2006/11/25
- Re: Patch: Syntax and Hard Newlines, Stefan Monnier, 2006/11/26
- Re: Patch: Syntax and Hard Newlines, Herbert Euler, 2006/11/28
- Re: Patch: Syntax and Hard Newlines, Herbert Euler, 2006/11/28
- Re: Patch: Syntax and Hard Newlines,
Stefan Monnier <=
- Re: Patch: Syntax and Hard Newlines, Herbert Euler, 2006/11/29
- Re: Patch: Syntax and Hard Newlines, Stefan Monnier, 2006/11/29
- Re: Patch: Syntax and Hard Newlines, Richard Stallman, 2006/11/29
- Re: Patch: Syntax and Hard Newlines, David Kastrup, 2006/11/29
- Re: Patch: Syntax and Hard Newlines, Richard Stallman, 2006/11/19