From: pjb@informatimago.com (Pascal J. Bourguignon)
To: help-gnu-emacs@gnu.org
Subject: Re: How to describe something in Lisp?
Date: Tue, 03 Feb 2009 17:40:02 +0100 [thread overview]
Message-ID: <7cprhz3259.fsf@pbourguignon.anevia.com> (raw)
In-Reply-To: 1233676167.44903@arno.fh-trier.de
Andreas Politz <politza@fh-trier.de> writes:
> Johan Andersson wrote:
>> Hi!
>> As a Java and Ruby programmer I sometimes find it hard to code
>> Lisp. Right
>> now I'm working on a minor mode for which the structure would obvious for me
>> in Java or Ruby, but in Lisp is a riddle.
>> I will not describe the mode itself, but give a description of the
>> problem.
>> Say I want to store a list of people in a file. And for each person, also
>> some information on them in the format:
>> name|age|married|sex
>> Each time I start the mode, that file should be parsed in to some
>> datastructure (which kind of is the problem). And on save, the file would be
>> updated. For me it's obvious to represent a person with a class:
>> [...]
>> I read something about object orientation in lisp, but I have never
>> seen this be used in Emacs. So my question is basically: What is the best
>> way to model something in lisp, that you in an object oriented language
>> would model with a class.
>> Thanks!
>
> (defstruct person
> [...]
There is also EIEIO which is an implementation of CLOS, the Common
Lisp Object System, adapted for emacs.
You can find it part of http://cedet.sourceforge.net/
Then you can define your objects:
(require 'eieio)
(defclass person
((name :type string :initarg :name :accessor name)
(birthdate :type date :initarg :birthdate :accessor birthdate))
(status :type marital-status :initarg :martial-status :accessor martial-status)
(sex :type (member :male :female) :initarg :sex :accessor sex))
(defmethod age ((p person))
(date- (now) (birthdate p)))
...
--
__Pascal Bourguignon__
next prev parent reply other threads:[~2009-02-03 16:40 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <mailman.6644.1233674526.26697.help-gnu-emacs@gnu.org>
2009-02-03 15:48 ` How to describe something in Lisp? Andreas Politz
2009-02-03 16:40 ` Pascal J. Bourguignon [this message]
2009-02-03 16:44 ` Johan Andersson
2009-02-03 16:54 ` Tassilo Horn
2009-02-03 17:07 ` Johan Andersson
2009-02-03 14:23 Johan Andersson
2009-02-03 16:24 ` Thierry Volpiatto
2009-02-03 16:46 ` Tassilo Horn
[not found] ` <mailman.6652.1233679633.26697.help-gnu-emacs@gnu.org>
2009-02-04 10:33 ` Pascal J. Bourguignon
2009-02-04 11:43 ` Tassilo Horn
2009-02-05 2:28 ` Pascal J. Bourguignon
2009-02-05 7:22 ` Johan Andersson
[not found] ` <mailman.16.1233818553.17492.help-gnu-emacs@gnu.org>
2009-02-06 18:53 ` Ted Zlatanov
[not found] ` <7c63jq3319.fsf@pbourguignon.informatimago.com>
[not found] ` <mailman.6723.1233747843.26697.help-gnu-emacs@gnu.org>
2009-02-04 13:26 ` Pascal J. Bourguignon
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