From: pjb@informatimago.com (Pascal J. Bourguignon)
To: help-gnu-emacs@gnu.org
Subject: Re: changing visuals of code in emacs
Date: Sun, 12 Oct 2008 23:44:25 +0200 [thread overview]
Message-ID: <874p3h1oau.fsf@hubble.informatimago.com> (raw)
In-Reply-To: K8n9AH.t26@beaver.cs.washington.edu
Andrei Alexandrescu <SeeWebsiteForEmail@erdani.org> writes:
> Pascal J. Bourguignon wrote:
>> Andrei Alexandrescu <SeeWebsiteForEmail@erdani.org> writes:
>>
>>> Hello,
>>>
>>>
>>> I'd like to change code visuals for the D programming language as
>>> follows. I'd like the construct:
>>>
>>> Symbol!(balanced_parens)
>>>
>>> to be visualized as:
>>>
>>> Symbol«balanced_parens»
>>>
>>> The chevrons should appear electrically when I type the closing
>>> ")". Note that balanced_parens could in turn nested use of "!()", as
>>> in A!(B!(C)), and they should all be paired using chevrons. The
>>> underlying file should not contain the chevrons, just the ASCII
>>> representation using "!(" and ")".
>>>
>>> I haven't done much elisp programming beyond the common .emacs
>>> configuration tricks, so I don't know where to start. A few searches
>>> suggested that overlays may be what I'm looking for... any ideas and
>>> pointers? Thank you.
>> If you didn't ask for recursion, this could have be done with
>> font-locking.
>> (font-lock-add-keywords nil
>> '(("\\(!(\\)[^()]*\\()\\)" 0 (progn
>> (compose-region (match-beginning 1) (match-end 1) ?« 'decompose-region)
>> (compose-region (match-beginning 2) (match-end 2) ?» 'decompose-region)
>> nil))))
>> But since this uses regular expressions, it won't work for recursive
>> !(...).
>> You can still use compose-region, but you'll have to implement the
>> parsing yourself. Perhaps this could be hooked on the code doing the
>> parenthesis balancing?
>
> I think I'd be happy with a nonrecursive region to get my feet
> wet. How do I use your font-lock-add-keywords code? I added it to both
> my .emacs and my d-mode.el file, to no avail.
You could run it from a d-mode-hook if it exists, ensuring that
font-lock-mode is enabled.
(add-hook 'd-mode-hook
(lambda ()
(font-lock-add-keywords nil
'(("\\(!(\\)[^()]*\\()\\)" 0 (progn
(compose-region (match-beginning 1) (match-end 1) ?« 'decompose-region)
(compose-region (match-beginning 2) (match-end 2) ?» 'decompose-region)
nil))))
(font-lock-mode 1)))
--
__Pascal Bourguignon__ http://www.informatimago.com/
Pour moi, la grande question n'a jamais été: «Qui suis-je? Où vais-je?»
comme l'a formulé si adroitement notre ami Pascal, mais plutôt:
«Comment vais-je m'en tirer?» -- Jean Yanne
next prev parent reply other threads:[~2008-10-12 21:44 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-10-12 20:11 changing visuals of code in emacs Andrei Alexandrescu
2008-10-12 20:48 ` Pascal J. Bourguignon
2008-10-12 21:06 ` Andrei Alexandrescu
2008-10-12 21:44 ` Pascal J. Bourguignon [this message]
2008-10-12 22:18 ` Andrei Alexandrescu
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