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;;; defsetf.lisp
;;;
;;; Copyright (C) 2003-2005 Peter Graves
;;; $Id$
;;;
;;; This program is free software; you can redistribute it and/or
;;; modify it under the terms of the GNU General Public License
;;; as published by the Free Software Foundation; either version 2
;;; of the License, or (at your option) any later version.
;;;
;;; This program 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 General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with this program; if not, write to the Free Software
;;; Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
;;;
;;; As a special exception, the copyright holders of this library give you
;;; permission to link this library with independent modules to produce an
;;; executable, regardless of the license terms of these independent
;;; modules, and to copy and distribute the resulting executable under
;;; terms of your choice, provided that you also meet, for each linked
;;; independent module, the terms and conditions of the license of that
;;; module. An independent module is a module which is not derived from
;;; or based on this library. If you modify this library, you may extend
;;; this exception to your version of the library, but you are not
;;; obligated to do so. If you do not wish to do so, delete this
;;; exception statement from your version.
;;; Adapted from SBCL.
(in-package #:system)
(require '#:collect)
(defun %defsetf (orig-access-form num-store-vars expander)
(collect ((subforms) (subform-vars) (subform-exprs) (store-vars))
(dolist (subform (cdr orig-access-form))
(if (constantp subform)
(subforms subform)
(let ((var (gensym)))
(subforms var)
(subform-vars var)
(subform-exprs subform))))
(dotimes (i num-store-vars)
(store-vars (gensym)))
(values (subform-vars)
(subform-exprs)
(store-vars)
(funcall expander (cons (subforms) (store-vars)))
`(,(car orig-access-form) ,@(subforms)))))
(defmacro defsetf (access-fn &rest rest)
(cond ((not (listp (car rest)))
`(eval-when (:load-toplevel :compile-toplevel :execute)
(%define-setf-macro ',access-fn
nil
',(car rest)
,(when (and (car rest) (stringp (cadr rest)))
`',(cadr rest)))))
((and (cdr rest) (listp (cadr rest)))
(destructuring-bind
(lambda-list (&rest store-variables) &body body)
rest
(let ((arglist-var (gensym "ARGS-"))
(access-form-var (gensym "ACCESS-FORM-"))
(env-var (gensym "ENVIRONMENT-")))
(multiple-value-bind
(body doc)
(parse-defmacro `(,lambda-list ,@store-variables)
arglist-var body access-fn 'defsetf
:anonymousp t)
`(eval-when (:load-toplevel :compile-toplevel :execute)
(%define-setf-macro
',access-fn
#'(lambda (,access-form-var ,env-var)
(declare (ignore ,env-var))
(%defsetf ,access-form-var ,(length store-variables)
#'(lambda (,arglist-var)
(block ,access-fn
,body))))
nil
',doc))))))
(t
(error "Ill-formed DEFSETF for ~S" access-fn))))
