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Diffstat (limited to 'module/oop/goops/active-slot.scm')
-rw-r--r-- | module/oop/goops/active-slot.scm | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/module/oop/goops/active-slot.scm b/module/oop/goops/active-slot.scm new file mode 100644 index 000000000..98f2d3f68 --- /dev/null +++ b/module/oop/goops/active-slot.scm @@ -0,0 +1,63 @@ +;;; installed-scm-file + +;;;; Copyright (C) 1999, 2001, 2006, 2009, 2015 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 (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))) |