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;;; late-setf.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.
;;; From CMUCL/SBCL.
(in-package #:system)
(defmacro define-setf-expander (access-fn lambda-list &body body)
(require-type access-fn 'symbol)
(let ((whole (gensym "WHOLE-"))
(environment (gensym "ENV-")))
(multiple-value-bind (body local-decs doc)
(parse-defmacro lambda-list whole body access-fn
'define-setf-expander
:environment environment)
`(progn
(record-source-information-for-type ',access-fn :setf-expander)
(eval-when (:compile-toplevel :load-toplevel :execute)
,@(when doc
`((%set-documentation ',access-fn 'setf ,doc)))
(setf (get ',access-fn 'setf-expander)
#'(lambda (,whole ,environment)
,@local-decs
(block ,access-fn ,body)))
',access-fn)))))
(define-setf-expander values (&rest places &environment env)
(let ((setters ())
(getters ())
(all-dummies ())
(all-vals ())
(newvals ()))
(dolist (place places)
(multiple-value-bind (dummies vals newval setter getter)
(get-setf-expansion place env)
(setf all-dummies (append all-dummies dummies (cdr newval))
all-vals (append all-vals vals
(mapcar (constantly nil) (cdr newval)))
newvals (append newvals (list (car newval))))
(push setter setters)
(push getter getters)))
(values all-dummies all-vals newvals
`(values ,@(reverse setters)) `(values ,@(reverse getters)))))
(defun make-gensym-list (n)
(let ((list ()))
(dotimes (i n list)
(push (gensym) list))))
(define-setf-expander getf (place prop &optional default &environment env)
(multiple-value-bind (temps values stores set get)
(get-setf-expansion place env)
(let ((newval (gensym))
(ptemp (gensym))
(def-temp (if default (gensym))))
(values `(,@temps ,ptemp ,@(if default `(,def-temp)))
`(,@values ,prop ,@(if default `(,default)))
`(,newval)
`(let ((,(car stores) (%putf ,get ,ptemp ,newval)))
,set
,newval)
`(getf ,get ,ptemp ,@(if default `(,def-temp)))))))
(define-setf-expander apply (functionoid &rest args)
(let ((function (second functionoid))
(new-var (gensym))
(vars (make-gensym-list (length args))))
(values vars args (list new-var)
`(apply #'(setf ,function) ,new-var ,@vars)
`(apply #',function ,@vars))))
(define-setf-expander the (type place &environment env)
(multiple-value-bind (temps subforms store-vars setter getter)
(get-setf-expansion place env)
(values temps subforms store-vars
`(multiple-value-bind ,store-vars
(the ,type (values ,@store-vars))
,setter)
`(the ,type ,getter))))
(defun (setf macro-function) (new-function symbol &optional environment)
(declare (ignore environment))
(let ((macro (make-macro symbol (or (precompile nil new-function)
new-function))))
(fset symbol macro)
macro))
