File size: 2,311 Bytes
3dcad1f |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 |
;;; installed-scm-file
;;;; Copyright (C) 1999, 2001, 2006, 2009, 2015 Free Software Foundation, Inc.
;;;; Copyright (C) 1993-1998 Erick Gallesio - I3S-CNRS/ESSI <[email protected]>
;;;;
;;;; 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 <[email protected]>.
;;;;
(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 (slot-definition-options 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 *unbound*))
(slot-set! class 'nfields (+ index 1))
(list (lambda (o)
(if before-ref
(if (before-ref o)
(let ((res (struct-ref o index)))
(and after-ref (not (eqv? res unbound)) (after-ref o))
res)
*unbound*)
(let ((res (struct-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
(struct-set! o index v)
(and after-set! (after-set! o v))))
(begin
(struct-set! o index v)
(and after-set! (after-set! o v)))))))
(next-method)))
|