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91 lines
3.6 KiB
Scheme
91 lines
3.6 KiB
Scheme
;;; installed-scm-file
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;;;; Copyright (C) 1999, 2001 Free Software Foundation, Inc.
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;;;;
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;;;; This program is free software; you can redistribute it and/or modify
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;;;; it under the terms of the GNU General Public License as published by
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;;;; the Free Software Foundation; either version 2, or (at your option)
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;;;; any later version.
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;;;;
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;;;; This program is distributed in the hope that it will be useful,
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;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;;; GNU General Public License for more details.
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;;;;
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;;;; You should have received a copy of the GNU General Public License
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;;;; along with this software; see the file COPYING. If not, write to
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;;;; the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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;;;; Boston, MA 02110-1301 USA
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;;;;
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;;;; As a special exception, the Free Software Foundation gives permission
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;;;; for additional uses of the text contained in its release of GUILE.
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;;;;
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;;;; The exception is that, if you link the GUILE library with other files
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;;;; to produce an executable, this does not by itself cause the
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;;;; resulting executable to be covered by the GNU General Public License.
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;;;; Your use of that executable is in no way restricted on account of
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;;;; linking the GUILE library code into it.
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;;;;
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;;;; This exception does not however invalidate any other reasons why
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;;;; the executable file might be covered by the GNU General Public License.
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;;;;
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;;;; This exception applies only to the code released by the
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;;;; Free Software Foundation under the name GUILE. If you copy
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;;;; code from other Free Software Foundation releases into a copy of
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;;;; GUILE, as the General Public License permits, the exception does
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;;;; not apply to the code that you add in this way. To avoid misleading
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;;;; anyone as to the status of such modified files, you must delete
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;;;; this exception notice from them.
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;;;;
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;;;; If you write modifications of your own for GUILE, it is your choice
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;;;; whether to permit this exception to apply to your modifications.
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;;;; If you do not wish that, delete this exception notice.
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;;;;
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;;;; This software is a derivative work of other copyrighted softwares; the
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;;;; copyright notices of these softwares are placed in the file COPYRIGHTS
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;;;;
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;;;; This file is based upon active-slot.stklos from the STk
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;;;; distribution by Erick Gallesio <eg@unice.fr>.
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;;;;
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(define-module (oop goops active-slot)
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:use-module (oop goops internal)
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:export (<active-class>))
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(define-class <active-class> (<class>))
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(define-method (compute-get-n-set (class <active-class>) slot)
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(if (eq? (slot-definition-allocation slot) #:active)
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(let* ((index (slot-ref class 'nfields))
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(name (car slot))
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(s (cdr slot))
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(env (class-environment class))
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(before-ref (get-keyword #:before-slot-ref s #f))
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(after-ref (get-keyword #:after-slot-ref s #f))
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(before-set! (get-keyword #:before-slot-set! s #f))
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(after-set! (get-keyword #:after-slot-set! s #f))
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(unbound (make-unbound)))
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(slot-set! class 'nfields (+ index 1))
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(list (lambda (o)
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(if before-ref
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(if (before-ref o)
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(let ((res (%fast-slot-ref o index)))
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(and after-ref (not (eqv? res unbound)) (after-ref o))
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res)
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(make-unbound))
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(let ((res (%fast-slot-ref o index)))
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(and after-ref (not (eqv? res unbound)) (after-ref o))
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res)))
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(lambda (o v)
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(if before-set!
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(if (before-set! o v)
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(begin
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(%fast-slot-set! o index v)
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(and after-set! (after-set! o v))))
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(begin
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(%fast-slot-set! o index v)
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(and after-set! (after-set! o v)))))))
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(next-method)))
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