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;;; dolist.lisp
;;;
;;; Copyright (C) 2004-2005 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)
(defmacro dolist ((var list-form &optional (result-form nil)) &body body)
;; We repeatedly bind the var instead of setting it so that we never
;; have to give the var an arbitrary value such as NIL (which might
;; conflict with a declaration). If there is a result form, we
;; introduce a gratuitous binding of the variable to NIL without the
;; declarations, then evaluate the result form in that
;; environment. We spuriously reference the gratuitous variable,
;; since we don't want to use IGNORABLE on what might be a special
;; var.
(multiple-value-bind (forms decls)
(parse-body body nil)
(let ((list (gensym "LIST-"))
(top (gensym "TOP-")))
`(block nil
(let ((,list ,list-form))
(tagbody
,top
(unless (endp ,list)
(let ((,var (%car ,list)))
,@decls
(setq ,list (%cdr ,list))
(tagbody ,@forms))
(go ,top))))
,(if (constantp result-form)
`,result-form
`(let ((,var nil))
,@decls
,var
,result-form))))))
