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;;; do.lisp
;;;
;;; Copyright (C) 2004-2006 Peter Graves
;;;
;;; 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 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 CMUCL.
(in-package "SYSTEM")
(defun do-do-body (varlist endlist decls-and-code bind step name block)
(let* ((inits ())
(steps ())
(L1 (gensym))
(L2 (gensym)))
;; Check for illegal old-style do.
(when (or (not (listp varlist)) (atom endlist))
(error "Ill-formed ~S -- possibly illegal old style DO?" name))
;; Parse the varlist to get inits and steps.
(dolist (v varlist)
(cond ((symbolp v) (push v inits))
((listp v)
(unless (symbolp (first v))
(error "~S step variable is not a symbol: ~S" name (first v)))
(case (length v)
(1 (push (first v) inits))
(2 (push v inits))
(3 (push (list (first v) (second v)) inits)
(setq steps (list* (third v) (first v) steps)))
(t (error "~S is an illegal form for a ~S varlist." v name))))
(t (error "~S is an illegal form for a ~S varlist." v name))))
;; Construct the new form.
(multiple-value-bind (code decls) (parse-body decls-and-code nil)
`(block ,block
(,bind ,(nreverse inits)
,@decls
(tagbody
(go ,L2)
,L1
,@code
(,step ,@(nreverse steps))
,L2
(unless ,(car endlist) (go ,L1))
(return-from ,block (progn ,@(cdr endlist)))))))))
(defmacro do (varlist endlist &rest body)
(do-do-body varlist endlist body 'let 'psetq 'do nil))
(defmacro do* (varlist endlist &rest body)
(do-do-body varlist endlist body 'let* 'setq 'do* nil))
