GNU bug report logs - #239
23.0.60; \ is considered whitespace syntax in Lisp mode?

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Message #5 received at submit <at> emacsbugs.donarmstrong.com (full text, mbox):

From: "Drew Adams" <drew.adams <at> oracle.com>
To: <emacs-pretest-bug <at> gnu.org>
Subject: 23.0.60; \ is considered whitespace syntax in Lisp mode?
Date: Tue, 13 May 2008 20:33:43 -0700

emacs -Q
In *scratch*, type a backslash followed by a TAB and a letter:
 
\ b
 
Put the cursor on the letter.
M-: (skip-syntax-backward "\\s-")
 
The cursor is on the backslash. IOW, it skipped not only the
whitespace but also the \, which should have escape syntax.
 
This is the first time I've noticed this, so I'm guessing there is a
good explanation and this behavior is somehow correct. But looking at
the Elisp manual, I don't get that impression. Willing to learn...
 

In GNU Emacs 23.0.60.1 (i386-mingw-nt5.1.2600)
 of 2008-05-04 on LENNART-69DE564
Windowing system distributor `Microsoft Corp.', version 5.1.2600
configured using `configure --with-gcc (3.4) --no-opt --cflags -Ic:/g/include
-fno-crossjumping'
 

Message #10 received at submit <at> emacsbugs.donarmstrong.com (full text, mbox):

From: Kevin Rodgers <kevin.d.rodgers <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: Re: bug#239: 23.0.60; \ is considered whitespace syntax in Lisp mode?
Date: Wed, 21 May 2008 20:46:25 -0600

Drew Adams wrote:
> emacs -Q
> In *scratch*, type a backslash followed by a TAB and a letter:
>  
> \ b
>  
> Put the cursor on the letter.
> M-: (skip-syntax-backward "\\s-")
>  
> The cursor is on the backslash. IOW, it skipped not only the
> whitespace but also the \, which should have escape syntax.
>  
> This is the first time I've noticed this, so I'm guessing there is a
> good explanation and this behavior is somehow correct. But looking at
> the Elisp manual, I don't get that impression. Willing to learn...

The SYNTAX argument to skip-syntax-forward and -backward is not a
regexp.

The argument in the example above means to skip any character with any
of 3 syntax classes:

	\	escape
	s	[not a valid syntax class]
	-	whitespace

-- 
Kevin Rodgers
Denver, Colorado, USA

Message #15 received at submit <at> emacsbugs.donarmstrong.com (full text, mbox):

From: "Drew Adams" <drew.adams <at> oracle.com>
To: "'Kevin Rodgers'" <kevin.d.rodgers <at> gmail.com>,
        <239 <at> debbugs.gnu.org>, <bug-gnu-emacs <at> gnu.org>
Subject: RE: bug#239: 23.0.60; \ is considered whitespace syntax in Lisp mode?
Date: Thu, 22 May 2008 14:39:00 -0700

> The SYNTAX argument to skip-syntax-forward and -backward is not a
> regexp.
> 
> The argument in the example above means to skip any character with any
> of 3 syntax classes:
> 	\	escape
> 	s	[not a valid syntax class]
> 	-	whitespace

Yes, someone else already pointed that out.
Thanks.

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