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Re: intern-soft, find-face/get-face, and facep for determining faces' de
From: |
Stephen J. Turnbull |
Subject: |
Re: intern-soft, find-face/get-face, and facep for determining faces' definedness |
Date: |
Tue, 02 Nov 2004 20:07:03 +0900 |
User-agent: |
Gnus/5.1006 (Gnus v5.10.6) XEmacs/21.5 (chayote, linux) |
>>>>> "Miles" == Miles Bader <address@hidden> writes:
Miles> Brian Palmer <address@hidden> writes:
>> If find-face in emacs didn't return a face object, it wouldn't
>> be doing a very good job of compatibility, now.
Miles> What's a "face object" in Emacs?
A symbol, I should think. I was confused by the fact that `facep'
returns a vector of length 17 whose first element is the symbol 'face.
However, I would guess that that's a useless artifact of the
implementation, since (facep (facep 'bold)) is nil.
Miles> [Indeed, what's a "face object" in Xemacs?]
A C structure wrapped in Lisp housekeeping information that implements
a face. I'm not sure why they were exposed to Lisp in the first
place; I suspect to avoid repeated lookups in code that compares faces
to determine if they contrast and the like. Probably a premature
optimization.
Miles> How are they different than a face name (other than what
Miles> `facep' returns in Xemacs)?
A face name is a symbol. A face object is a data structure.
Miles> Given that Xemacs has a differing definition of facep
Miles> requiring one to use `find-face' instead, would an Emacs
Miles> version:
Miles> (defun find-face (face) (and (facep face) face))
Miles> do the job?
Yes.
--
Institute of Policy and Planning Sciences http://turnbull.sk.tsukuba.ac.jp
University of Tsukuba Tennodai 1-1-1 Tsukuba 305-8573 JAPAN
Ask not how you can "do" free software business;
ask what your business can "do for" free software.
- Re: intern-soft, find-face/get-face, and facep for determining faces' definedness, (continued)
- Re: intern-soft, find-face/get-face, and facep for determining faces' definedness, Stephen J. Turnbull, 2004/11/02
- Re: intern-soft, find-face/get-face, and facep for determining faces' definedness, Brian Palmer, 2004/11/02
- Re: intern-soft, find-face/get-face, and facep for determining faces' definedness, Miles Bader, 2004/11/02
- Re: intern-soft, find-face/get-face, and facep for determining faces' definedness, Brian Palmer, 2004/11/02
- Re: intern-soft, find-face/get-face, and facep for determining faces' definedness, Miles Bader, 2004/11/02
- Re: intern-soft, find-face/get-face, and facep for determining faces' definedness, Brian Palmer, 2004/11/02
- Re: intern-soft, find-face/get-face, and facep for determining faces' definedness, Miles Bader, 2004/11/02
- Re: intern-soft, find-face/get-face, and facep for determining faces' definedness, Stephen J. Turnbull, 2004/11/02
- Re: intern-soft, find-face/get-face, and facep for determining faces' definedness, Miles Bader, 2004/11/02
- Re: intern-soft, find-face/get-face, and facep for determining faces' definedness, Oliver Scholz, 2004/11/06
- Re: intern-soft, find-face/get-face, and facep for determining faces' definedness,
Stephen J. Turnbull <=
- Re: intern-soft, find-face/get-face, and facep for determining faces' definedness, Stefan, 2004/11/02
- Re: intern-soft, find-face/get-face, and facep for determining faces' definedness, Miles Bader, 2004/11/02
- Re: intern-soft, find-face/get-face, and facep for determining faces' definedness, Richard Stallman, 2004/11/03
- Re: intern-soft, find-face/get-face, and facep for determining faces' definedness, Stefan Monnier, 2004/11/03
- Re: intern-soft, find-face/get-face, and facep for determining faces' definedness, Zajcev Evgeny, 2004/11/03
- Re: intern-soft, find-face/get-face, and facep for determining faces' definedness, Andreas Schwab, 2004/11/03
- Re: intern-soft, find-face/get-face, and facep for determining faces' definedness, Zajcev Evgeny, 2004/11/03
- Re: intern-soft, find-face/get-face, and facep for determining faces' definedness, Stephen J. Turnbull, 2004/11/04
- Re: intern-soft, find-face/get-face, and facep for determining faces' definedness, Stefan Monnier, 2004/11/03
- Re: intern-soft, find-face/get-face, and facep for determining faces' definedness, Stephen J. Turnbull, 2004/11/03