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66 lines
2.4 KiB
Scheme
66 lines
2.4 KiB
Scheme
;;; installed-scm-file
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;;;; Copyright (C) 1999, 2001, 2006 Free Software Foundation, Inc.
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;;;;
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;;;; This library is free software; you can redistribute it and/or
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;;;; modify it under the terms of the GNU Lesser General Public
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;;;; License as published by the Free Software Foundation; either
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;;;; version 2.1 of the License, or (at your option) any later version.
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;;;;
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;;;; This library 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 GNU
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;;;; Lesser General Public License for more details.
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;;;;
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;;;; You should have received a copy of the GNU Lesser General Public
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;;;; License along with this library; if not, write to the Free Software
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;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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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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