From: Andreas Schwab <schwab@suse.de>
Cc: bug-gnu-emacs@gnu.org
Subject: Re: problem with text properties whose names aren't symbols
Date: Mon, 12 Dec 2005 12:04:12 +0100 [thread overview]
Message-ID: <jehd9e8tlf.fsf@sykes.suse.de> (raw)
In-Reply-To: <20051212024921.DBF2881A3@planetmath.cc.vt.edu> (Joe Corneli's message of "Sun, 11 Dec 2005 21:49:21 -0500 (EST)")
Joe Corneli <jcorneli@planetmath.org> writes:
>>From the elisp manual (node: Text Properties):
>
> Each property has a name and a value. Both of these
> can be any Lisp object, but the name is normally a symbol.
>
> Well, it seems that when the Lisp object is not a symbol,
> there is a problem. This is illustrated by evaluating
> the following form interactively:
>
> (progn
> (put-text-property (point) (1+ (point))
> '(example name)
> t)
> (put-text-property (point) (1+ (point))
> '(example name)
> nil)
> (text-properties-at (point)))
This is not a bug, because '(example name) and '(example name) are
distinct objects:
ELISP> (eq '(example name) '(example name))
nil
Try this instead:
(let ((name '(example name)))
(put-text-property (point) (1+ (point)) name t)
(put-text-property (point) (1+ (point)) name nil)
(text-properties-at (point)))
Andreas.
--
Andreas Schwab, SuSE Labs, schwab@suse.de
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
PGP key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5
"And now for something completely different."
next prev parent reply other threads:[~2005-12-12 11:04 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-12-12 2:49 problem with text properties whose names aren't symbols Joe Corneli
2005-12-12 11:04 ` Andreas Schwab [this message]
2005-12-12 16:48 ` Joe Corneli
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