| ;;; 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))) | |