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From: Daniel Colascione <danc@merrillpress.com>
To: Miles Bader <miles@gnu.org>
Cc: emacs-devel@gnu.org, David Engster <deng@randomsample.de>,
	Daniel Colascione <danc@merrillprint.com>,
	Lennart Borgman <lennart.borgman@gmail.com>,
	Deniz Dogan <deniz.a.m.dogan@gmail.com>,
	Stefan Monnier <monnier@iro.umontreal.ca>,
	Steve Yegge <stevey@google.com>, Leo <sdl.web@gmail.com>
Subject: Re: "Font-lock is limited to text matching" is a myth
Date: Tue, 11 Aug 2009 10:53:13 -0400	[thread overview]
Message-ID: <F72520C9-788E-400A-A43C-F3A8BBE73602@merrillpress.com> (raw)
In-Reply-To: <87r5vipgbs.fsf@catnip.gol.com>

On Aug 11, 2009, at 10:37 AM, Miles Bader wrote:
> Daniel Colascione <danc@merrillpress.com> writes:
>>> Note: diagnostic messages in js2-mode are highlighted using  
>>> overlays.
>>> I tried using overlays for all highlighting but it was unacceptably
>>> slow and had a tendency to crash Emacs.
>>
>> I've had the same thought. Just as in aside, overlays seem like a  
>> much
>> better conceptual fit for fontification than text properties do.
>
> Why?

AIUI, text properties are considered *part* of the document being  
edited, which is why modifying text properties modifies the buffer  
modified flag, why they appear in the undo list, and so on, whereas  
overlays are for transient, regenerable information *about* the text  
in the document. Fontification is definitely regenerable, transient  
information, and so should use overlays. I'm also not particularly  
fond of fontification being carried around when I kill and yank.

But like you said, these are minor issues and can be worked around.  
It's no big deal, and text properties perform much better on GNU  
Emacs. (IIRC, each overlay actually uses a pair of markers. It's no  
wonder that using hundreds or thousands of them is slow.)

> [Aside from the "changing text-properties affect buffer-modified  
> status"
> silliness, which I think is probably a mistake, but that's easy enough
> to work around.]

Don't forget the undo entries too. Actually, the full list comes from  
font-lock.el:

(defmacro save-buffer-state (varlist &rest body)
     "Bind variables according to VARLIST and eval BODY restoring  
buffer state."
     (declare (indent 1) (debug let))
     (let ((modified (make-symbol "modified")))
       `(let* ,(append varlist
		      `((,modified (buffer-modified-p))
			(buffer-undo-list t)
			(inhibit-read-only t)
			(inhibit-point-motion-hooks t)
			(inhibit-modification-hooks t)
			deactivate-mark
			buffer-file-name
			buffer-file-truename))
	 (progn
	   ,@body)
	 (unless ,modified
	   (restore-buffer-modified-p nil)))))




  parent reply	other threads:[~2009-08-11 14:53 UTC|newest]

Thread overview: 122+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-08-09 23:34 Why js2-mode in Emacs 23.2? Deniz Dogan
2009-08-09 23:38 ` Lennart Borgman
2009-08-09 23:46   ` Daniel Colascione
2009-08-09 23:50     ` Deniz Dogan
2009-08-09 23:56       ` Lennart Borgman
2009-08-09 23:56       ` Daniel Colascione
2009-08-09 23:55     ` Lennart Borgman
2009-08-09 23:58       ` Daniel Colascione
2009-08-10  0:00         ` Lennart Borgman
2009-08-10  0:06           ` Daniel Colascione
2009-08-10  0:17             ` Lennart Borgman
2009-08-10  0:46               ` Daniel Colascione
2009-08-10  0:55                 ` Lennart Borgman
2009-08-10  0:18         ` Leo
2009-08-10  0:49           ` Daniel Colascione
2009-08-10  7:06           ` Carsten Dominik
2009-08-10  8:44             ` Leo
2009-08-10  8:54               ` CHENG Gao
2009-08-10  9:26                 ` Leo
2009-08-10 10:22                   ` Richard Riley
2009-08-10 15:21                   ` eval-after-load not harmful after all (Was: Re: Why js-2mode?) Daniel Colascione
2009-08-10 17:01                     ` Drew Adams
2009-08-10 17:21                       ` eval-after-load not harmful after all Stefan Monnier
2009-08-11  0:43                       ` eval-after-load not harmful after all (Was: Re: Why js-2mode?) Stephen J. Turnbull
2009-08-11  0:46                         ` Drew Adams
2009-08-11 14:06                           ` Stephen J. Turnbull
2009-08-11 15:08                           ` eval-after-load not harmful after all Stefan Monnier
2009-08-16 21:43                             ` Leo
2009-08-17  0:34                               ` Lennart Borgman
2009-08-17 11:44                                 ` Leo
2009-08-17 11:55                                   ` Lennart Borgman
2009-08-17 12:26                                     ` Leo
2009-08-17 14:40                                       ` Lennart Borgman
2009-08-11  0:53                         ` eval-after-load not harmful after all (Was: Re: Why js-2mode?) Lennart Borgman
2009-08-11  3:06                         ` Daniel Colascione
2009-08-11  9:17                           ` Leo
2009-08-11 14:37                           ` Stephen J. Turnbull
2009-08-10 10:41               ` Why js2-mode in Emacs 23.2? Carsten Dominik
2009-08-10 13:04                 ` Leo
2009-08-10 14:55                   ` Stefan Monnier
2009-08-11  1:13                 ` Glenn Morris
2009-08-11  3:02                   ` Daniel Colascione
2009-08-11  4:28                     ` Dan Nicolaescu
2009-08-11  4:33                       ` Daniel Colascione
2009-08-11  4:39                         ` Dan Nicolaescu
2009-08-11  4:45                           ` Daniel Colascione
2009-08-11  4:37                     ` Glenn Morris
2009-08-10  2:47         ` Stefan Monnier
2009-08-10  2:55           ` Lennart Borgman
2009-08-10 13:12             ` Stefan Monnier
2009-08-10  0:32   ` Leo
2009-08-10  0:48     ` Daniel Colascione
2009-08-10  2:55       ` Stefan Monnier
2009-08-10  3:24         ` Miles Bader
2009-08-10  3:27           ` Lennart Borgman
2009-08-10  3:45             ` Daniel Colascione
2009-08-10  5:18             ` Jason Rumney
2009-08-10  5:51           ` Xah Lee
2009-08-10  6:22             ` Xah Lee
2009-08-10  6:59               ` Miles Bader
2009-08-10 11:01             ` Lennart Borgman
2009-08-10 17:35             ` "Font-lock is limited to text matching" is a myth Daniel Colascione
2009-08-10 18:04               ` Lennart Borgman
2009-08-10 20:42                 ` David Engster
2009-08-10 20:51                   ` Lennart Borgman
2009-08-10 22:06                     ` Eric M. Ludlam
2009-08-10 22:19                       ` Lennart Borgman
2009-08-11  1:50                         ` Eric M. Ludlam
2009-08-11  6:47                           ` Steve Yegge
2009-08-11  9:17                             ` Miles Bader
2009-08-11 12:13                             ` Daniel Colascione
2009-08-11 14:37                               ` Miles Bader
2009-08-11 14:49                                 ` Lennart Borgman
2009-08-11 14:57                                   ` Daniel Colascione
2009-08-11 14:53                                 ` Daniel Colascione [this message]
2009-08-11 15:08                                   ` Lennart Borgman
2009-08-11 15:36                                   ` Miles Bader
2009-08-11 15:56                                 ` Stephen J. Turnbull
2009-08-11 15:54                                   ` Lennart Borgman
2009-08-11 17:00                                     ` Stephen J. Turnbull
2009-08-11 17:19                                       ` Lennart Borgman
2009-08-11 15:57                                   ` Miles Bader
2009-08-11 17:06                                     ` Stephen J. Turnbull
2009-08-11 14:50                               ` Chong Yidong
2009-08-11 15:06                                 ` Daniel Colascione
2009-08-11 15:11                                   ` Lennart Borgman
2009-08-11 15:16                                     ` Daniel Colascione
2009-08-11 15:44                                       ` Lennart Borgman
2009-08-11 18:04                                   ` joakim
2009-08-11 18:08                                     ` Lennart Borgman
2009-08-11 19:12                                       ` joakim
2009-08-11 17:09                               ` Stefan Monnier
2009-08-11 16:04                             ` Stefan Monnier
2009-08-11 18:10                               ` Edward O'Connor
2009-08-12  1:58                               ` Steve Yegge
2009-08-12 13:48                                 ` Chong Yidong
2009-08-12 16:07                                   ` Lennart Borgman
2009-08-12 22:08                                   ` Steve Yegge
2009-08-14  1:22                                 ` Stefan Monnier
2009-08-12  2:16                               ` Eric M. Ludlam
2009-08-12  6:43                                 ` Miles Bader
2009-08-12 11:28                                   ` Xah Lee
2010-11-23 14:43                                   ` Stefan Monnier
2009-08-12 15:21                               ` asynchronous parsing (was: "Font-lock is limited to text matching" is a myth) Ted Zlatanov
2009-08-12 17:16                                 ` asynchronous parsing joakim
2009-08-12 19:39                                   ` Ted Zlatanov
2009-08-12 20:01                                     ` joakim
2009-08-13  2:51                                 ` Stefan Monnier
2009-08-13 14:51                                   ` Ted Zlatanov
2009-08-11 19:48                           ` "Font-lock is limited to text matching" is a myth Lennart Borgman
2009-08-10 18:47               ` Stefan Monnier
2009-08-10 18:55                 ` Lennart Borgman
2009-08-11  3:33                   ` Stefan Monnier
2009-08-10 14:49           ` Why js2-mode in Emacs 23.2? Stefan Monnier
2009-08-10  6:46         ` Deniz Dogan
2009-08-10 14:53           ` Stefan Monnier
2009-08-10 14:05       ` Stephen Eilert
2009-08-10 14:37         ` Lennart Borgman
2009-08-10 14:42           ` Deniz Dogan
2009-08-10 19:12           ` Stephen Eilert
2009-08-10 14:41         ` Deniz Dogan
2009-08-10 14:57           ` Lennart Borgman

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