From: Stefan Monnier <monnier@iro.umontreal.ca>
To: "Drew Adams" <drew.adams@oracle.com>
Cc: 'Juri Linkov' <juri@jurta.org>, emacs-devel@gnu.org
Subject: Re: shouldn't `delete-blank-lines' treat form-feed as whitespace?
Date: Wed, 03 Mar 2010 23:28:36 -0500 [thread overview]
Message-ID: <jwvr5o04t2a.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <45AE884B58464C6F8533A686709EB31B@us.oracle.com> (Drew Adams's message of "Wed, 3 Mar 2010 11:54:09 -0800")
> Yes, I suppose the notion of whitespace is mode-dependent, and
> [:space:] should capture that notion appropriately for each
> mode. Good point.
It's actually even more delicate than that.
There's basically the notion of "blank" for characters that have no
associated semantics in the corresponding language. And then there's
the notion of "blank" for characters which *users* consider as having
no semantics.
Usually the first includes form-feed and other such things and is best
handled by forward-comment. Usually the second only includes \s, \t,
\n, \r but doesn't include form-feed.
syntax-tables usually use the `space' syntax for \s, \t, form-feed, \r,
and sometimes \n (but not always because of newline-terminated
comments). So using the `space' syntax is usually not a good choice
because of the \n issue and because it doesn't handle comments.
Stefan
next prev parent reply other threads:[~2010-03-04 4:28 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-28 20:44 shouldn't `delete-blank-lines' treat form-feed as whitespace? Drew Adams
2010-03-03 19:32 ` Juri Linkov
2010-03-03 19:54 ` Drew Adams
2010-03-04 4:28 ` Stefan Monnier [this message]
2010-03-05 8:48 ` Eli Zaretskii
2010-03-06 17:57 ` Juri Linkov
2010-03-06 18:56 ` Eli Zaretskii
2010-03-03 21:35 ` David De La Harpe Golden
2010-03-03 22:21 ` Drew Adams
2010-03-04 1:40 ` Miles Bader
2010-03-04 6:21 ` Drew Adams
[not found] <E1No0yT-0007vs-HZ@mail.fsf.org>
2010-03-06 22:34 ` Jonathan Yavner
2010-03-07 4:14 ` Eli Zaretskii
2010-03-07 4:34 ` Jonathan Yavner
2010-03-07 17:42 ` Eli Zaretskii
2010-03-07 18:11 ` Stephen J. Turnbull
2010-03-07 5:08 ` Stephen J. Turnbull
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