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;;; installed-scm-file
;;;; Copyright (C) 1999, 2001, 2006, 2009 Free Software Foundation, Inc.
;;;; Copyright (C) 1993-1998 Erick Gallesio - I3S-CNRS/ESSI <eg@unice.fr>
;;;;
;;;; This library is free software; you can redistribute it and/or
;;;; modify it under the terms of the GNU Lesser General Public
;;;; License as published by the Free Software Foundation; either
;;;; version 3 of the License, or (at your option) any later version.
;;;;
;;;; This library is distributed in the hope that it will be useful,
;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
;;;; Lesser General Public License for more details.
;;;;
;;;; You should have received a copy of the GNU Lesser General Public
;;;; License along with this library; if not, write to the Free Software
;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
;;;;
;;;;
;;;; This file was based upon active-slot.stklos from the STk distribution
;;;; version 4.0.1 by Erick Gallesio <eg@unice.fr>.
;;;;
(define-module (oop goops active-slot)
:use-module (oop goops internal)
:export (<active-class>))
(define-class <active-class> (<class>))
(define-method (compute-get-n-set (class <active-class>) slot)
(if (eq? (slot-definition-allocation slot) #:active)
(let* ((index (slot-ref class 'nfields))
(s (cdr slot))
(before-ref (get-keyword #:before-slot-ref s #f))
(after-ref (get-keyword #:after-slot-ref s #f))
(before-set! (get-keyword #:before-slot-set! s #f))
(after-set! (get-keyword #:after-slot-set! s #f))
(unbound (make-unbound)))
(slot-set! class 'nfields (+ index 1))
(list (lambda (o)
(if before-ref
(if (before-ref o)
(let ((res (%fast-slot-ref o index)))
(and after-ref (not (eqv? res unbound)) (after-ref o))
res)
(make-unbound))
(let ((res (%fast-slot-ref o index)))
(and after-ref (not (eqv? res unbound)) (after-ref o))
res)))
(lambda (o v)
(if before-set!
(if (before-set! o v)
(begin
(%fast-slot-set! o index v)
(and after-set! (after-set! o v))))
(begin
(%fast-slot-set! o index v)
(and after-set! (after-set! o v)))))))
(next-method)))