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View File Name : accessors.scm

;;;; 	Copyright (C) 1999, 2000, 2005, 2006 Free Software Foundation, Inc.
;;;; 
;;;; 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
;;;; 


(define-module (oop goops accessors)
  :use-module (oop goops)
  :re-export (standard-define-class)
  :export (define-class-with-accessors
	   define-class-with-accessors-keywords))

(define-macro (define-class-with-accessors name supers . slots)
  (let ((eat? #f))
    `(standard-define-class
      ,name ,supers
      ,@(map-in-order
         (lambda (slot)
           (cond (eat?
                  (set! eat? #f)
                  slot)
                 ((keyword? slot)
                  (set! eat? #t)
                  slot)
                 ((pair? slot)
                  (if (get-keyword #:accessor (cdr slot) #f)
                      slot
                      (let ((name (car slot)))
                        `(,name #:accessor ,name ,@(cdr slot)))))
                 (else
                  `(,slot #:accessor ,slot))))
         slots))))

(define-macro (define-class-with-accessors-keywords name supers . slots)
  (let ((eat? #f))
    `(standard-define-class
      ,name ,supers
      ,@(map-in-order
         (lambda (slot)
           (cond (eat?
                  (set! eat? #f)
                  slot)
                 ((keyword? slot)
                  (set! eat? #t)
                  slot)
                 ((pair? slot)
                  (let ((slot
                         (if (get-keyword #:accessor (cdr slot) #f)
                             slot
                             (let ((name (car slot)))
                               `(,name #:accessor ,name ,@(cdr slot))))))
                    (if (get-keyword #:init-keyword (cdr slot) #f)
                        slot
                        (let* ((name (car slot))
                               (keyword (symbol->keyword name)))
                          `(,name #:init-keyword ,keyword ,@(cdr slot))))))
                 (else
                  `(,slot #:accessor ,slot
                          #:init-keyword ,(symbol->keyword slot)))))
         slots))))