| ;;; installed-scm-file | |
| ;;;; Copyright (C) 1999, 2000, 2001, 2006, 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 composite-slot.stklos from the STk distribution | |
| ;;;; version 4.0.1 by Erick Gallesio <[email protected]>. | |
| ;;;; | |
| (define-module (oop goops composite-slot) | |
| :use-module (oop goops) | |
| :export (<composite-class>)) | |
| ;;; | |
| ;;; (define-class CLASS SUPERS | |
| ;;; ... | |
| ;;; (OBJECT ...) | |
| ;;; ... | |
| ;;; (SLOT #:allocation #:propagated | |
| ;;; #:propagate-to '(PROPAGATION ...)) | |
| ;;; ... | |
| ;;; #:metaclass <composite-class>) | |
| ;;; | |
| ;;; PROPAGATION ::= OBJECT | (OBJECT TARGETSLOT) | |
| ;;; | |
| ;;; The slot SLOT will be propagated to the slot TARGETSLOT in the object | |
| ;;; stored in slot OBJECT. If TARGETSLOT is omitted, assume that the target | |
| ;;; slot is named SLOT. | |
| ;;; | |
| (define-class <composite-class> (<class>)) | |
| (define-method (compute-get-n-set (class <composite-class>) slot) | |
| (if (eq? (slot-definition-allocation slot) #:propagated) | |
| (compute-propagated-get-n-set slot) | |
| (next-method))) | |
| (define (compute-propagated-get-n-set s) | |
| (let ((prop (get-keyword #:propagate-to | |
| (slot-definition-options s) | |
| #f)) | |
| (s-name (slot-definition-name s))) | |
| (if (not prop) | |
| (goops-error "Propagation not specified for slot ~S" s-name)) | |
| (if (not (pair? prop)) | |
| (goops-error "Bad propagation list for slot ~S" s-name)) | |
| (let ((objects (map (lambda (p) (if (pair? p) (car p) p)) prop)) | |
| (slots (map (lambda (p) (if (pair? p) (cadr p) s-name)) prop))) | |
| (let ((first-object (car objects)) | |
| (first-slot (car slots))) | |
| (list | |
| ;; The getter | |
| (lambda (o) | |
| (slot-ref (slot-ref o first-object) first-slot)) | |
| ;; The setter | |
| (if (null? (cdr objects)) | |
| (lambda (o v) | |
| (slot-set! (slot-ref o first-object) first-slot v)) | |
| (lambda (o v) | |
| (for-each (lambda (object slot) | |
| (slot-set! (slot-ref o object) slot v)) | |
| objects | |
| slots)))))))) | |