From: Marcin Borkowski <mbork@wmi.amu.edu.pl>
To: Help Gnu Emacs mailing list <help-gnu-emacs@gnu.org>
Subject: Re: XKCD/541 compliance, anyone?
Date: Sun, 15 Mar 2015 02:40:47 +0100 [thread overview]
Message-ID: <871tkrghr4.fsf@wmi.amu.edu.pl> (raw)
In-Reply-To: <8761drazec.fsf@wmi.amu.edu.pl>
Hi all,
so finally I sat down and finished my smiley code. I have still three
questions left, though. But first – the (deceptively simple) code.
--8<---------------cut here---------------start------------->8---
(defvar smiley-regex "[:;>B][,']?-?[][()]"
"This regex should match smileys, and only them.")
(defface smiley '((t :foreground "gray"))
"Face for displaying smileys.")
(setq parse-sexp-lookup-properties t)
(add-to-list 'font-lock-extra-managed-props 'syntax-table)
(defconst smiley-props `(face smiley syntax-table ,(string-to-syntax ".")))
(define-minor-mode xkcd-541-mode
"Toggle XKCD/541 mode. In this mode, smileys (as defined by
smiley-regex) are treated as punctuation by Emacs movement
commands etc. In particular, parens in smileys are skipped by
paren-matching commands."
:lighter " :)"
(if xkcd-541-mode
(font-lock-add-keywords nil `((,smiley-regex . smiley-props)))
(font-lock-remove-keywords nil `((,smiley-regex . smiley-props)))))
--8<---------------cut here---------------end--------------->8---
And now the questions.
1. In this post:
http://lists.gnu.org/archive/html/help-gnu-emacs/2015-01/msg00005.html
I noticed that syntax-propertize makes parse-sexp-lookup-properties
buffer-local. OTOH, in the next post
(http://lists.gnu.org/archive/html/help-gnu-emacs/2015-01/msg00008.html),
Stefan Monnier confirmed my suspicion that the performance hit from
setting it globally to t is negligible. Since I ended up not using
syntax-propertize – I think font-lock is better, especially that I also
want my smileys to be greyed out – I have to set
parse-sexp-lookup-properties manually. Should I do it in my mode toggle
function, remembering the previous value and resetting it after
disabling the mode? (More or less the same question concerns
font-lock-extra-managed-props.)
2. After enabling xkcd-541-mode, I have
,----
| (t
| (("[:;>B][,']?-?[][()]" . smiley-props))
| ("[:;>B][,']?-?[][()]"
| (0 smiley-props)))
`----
as the value of font-lock-keywords. Why does that look that strange?
Moreover, after /disabling/ the mode, the value of font-lock-keywords is
(t nil). Strange, isn’t it? Shouldn’t it be just nil?
3. The mode works – sort of, since there is one (a bit annoying) thing.
When I turn it on, and type this:
(hello world;-))
sometimes the opening paren is highlighted when typing the smiley (this
happens e.g. in emacs -Q after loading that mode), and sometimes not
(e.g. while I’m writing this message). Why might that be so?
Best,
Marcin
On 2014-12-04, at 22:16, Marcin Borkowski <mbork@wmi.amu.edu.pl> wrote:
> Hi there,
>
> it is so frustrating to be unable to use paren matching (like in
> show-paren mode, or C-M-f & friends) when I use smileys. And this
> *does* happen; comments in, say, elisp-mode seem to be safe, but in
> LaTeX smileys do break my workflow. Try entering this in AUCTeX:
>
> \textbf{Hello :-)}
>
> then put the point at the EOL and press C-M-b.
>
> I have a dream: to have the s-exp functions ignore closing parens,
> brackets etc. /after/, say, things matching
>
> [;:B]-?
>
> (this regex should probably cover the most basic cases).
>
> AFAIK, these functions are deeply hardcoded in Emacs; its behavior here
> seems to be inborn and instinctive rather than learned and reflective,
> so to speak. (I.e., it is based on the `scan-sexp' function, which is
> written in C rather than Elisp.) I imagine that redefining scan-sexp in
> Elisp is possible, but there might be problems with performance.
>
> Did anyone try that? Am I the only one with this problem, actually?
--
Marcin Borkowski
http://octd.wmi.amu.edu.pl/en/Marcin_Borkowski
Faculty of Mathematics and Computer Science
Adam Mickiewicz University
next prev parent reply other threads:[~2015-03-15 1:40 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-12-04 21:16 XKCD/541 compliance, anyone? Marcin Borkowski
2014-12-04 22:34 ` Stefan Monnier
2014-12-04 23:10 ` Marcin Borkowski
2014-12-05 22:33 ` Marcin Borkowski
2014-12-05 23:41 ` Artur Malabarba
2014-12-05 23:48 ` Marcin Borkowski
2014-12-31 9:19 ` Marcin Borkowski
2015-01-01 17:07 ` Stefan Monnier
2015-01-01 21:41 ` Marcin Borkowski
2015-01-02 4:07 ` Stefan Monnier
2015-01-02 10:09 ` Marcin Borkowski
2015-01-03 1:47 ` Stefan Monnier
2015-01-07 21:55 ` Marcin Borkowski
2015-01-02 14:39 ` Marcin Borkowski
2015-01-03 1:49 ` Stefan Monnier
2015-01-07 22:09 ` Marcin Borkowski
2015-01-07 22:37 ` Stefan Monnier
2015-01-08 1:09 ` Marcin Borkowski
2015-01-08 1:49 ` Stefan Monnier
2015-01-08 2:37 ` Marcin Borkowski
[not found] ` <mailman.17449.1420684651.1147.help-gnu-emacs@gnu.org>
2015-01-08 3:11 ` Stefan Monnier
2015-01-08 14:10 ` Marcin Borkowski
2015-03-15 1:40 ` Marcin Borkowski [this message]
2015-03-15 18:39 ` Stefan Monnier
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