source: trunk/abcl/src/org/armedbear/lisp/define-modify-macro.lisp

Last change on this file was 14727, checked in by Mark Evenson, 7 years ago

Make result of DEFINE-MODIFY-MACRO available at compilation time.

Thanks to Cyrus Harmon.

Fixes <> in support of not needing the
ugliness of

  • Property svn:eol-style set to native
  • Property svn:keywords set to Id
File size: 4.9 KB
1;;; define-modify-macro.lisp
3;;; Copyright (C) 2003-2005 Peter Graves
4;;; $Id: define-modify-macro.lisp 14727 2014-09-09 10:54:55Z mevenson $
6;;; This program is free software; you can redistribute it and/or
7;;; modify it under the terms of the GNU General Public License
8;;; as published by the Free Software Foundation; either version 2
9;;; of the License, or (at your option) any later version.
11;;; This program is distributed in the hope that it will be useful,
12;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
14;;; GNU General Public License for more details.
16;;; You should have received a copy of the GNU General Public License
17;;; along with this program; if not, write to the Free Software
18;;; Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
20;;; As a special exception, the copyright holders of this library give you
21;;; permission to link this library with independent modules to produce an
22;;; executable, regardless of the license terms of these independent
23;;; modules, and to copy and distribute the resulting executable under
24;;; terms of your choice, provided that you also meet, for each linked
25;;; independent module, the terms and conditions of the license of that
26;;; module.  An independent module is a module which is not derived from
27;;; or based on this library.  If you modify this library, you may extend
28;;; this exception to your version of the library, but you are not
29;;; obligated to do so.  If you do not wish to do so, delete this
30;;; exception statement from your version.
32;;; Adapted from SBCL.
34(in-package #:system)
36;; FIXME See section 5.1.3.
37(defmacro define-modify-macro (name lambda-list function &optional doc-string)
38  "Creates a new read-modify-write macro like PUSH or INCF."
39  (let ((other-args nil)
40  (rest-arg nil)
41  (env (gensym))
42  (reference (gensym)))
43    ;; Parse out the variable names and &REST arg from the lambda list.
44    (do ((ll lambda-list (cdr ll))
45   (arg nil))
46  ((null ll))
47      (setq arg (car ll))
48      (cond ((eq arg '&optional))
49      ((eq arg '&rest)
50       (if (symbolp (cadr ll))
51     (setq rest-arg (cadr ll))
52     (error "Non-symbol &REST arg in definition of ~S." name))
53       (if (null (cddr ll))
54     (return nil)
55     (error "Illegal stuff after &REST argument in DEFINE-MODIFY-MACRO.")))
56      ((memq arg '(&key &allow-other-keys &aux))
57       (error "~S not allowed in DEFINE-MODIFY-MACRO lambda list." arg))
58      ((symbolp arg)
59       (push arg other-args))
60      ((and (listp arg) (symbolp (car arg)))
61       (push (car arg) other-args))
62      (t (error "Illegal stuff in DEFINE-MODIFY-MACRO lambda list."))))
63    (setq other-args (nreverse other-args))
64    `(eval-when (:compile-toplevel :load-toplevel :execute)
65      (defmacro ,name (,reference ,@lambda-list &environment ,env)
66        ,doc-string
67        (multiple-value-bind (dummies vals newval setter getter)
68            (get-setf-expansion ,reference ,env)
69          (do ((d dummies (cdr d))
70               (v vals (cdr v))
71               (let-list nil (cons (list (car d) (car v)) let-list)))
72              ((null d)
73               (push (list (car newval)
74                           ,(if rest-arg
75                                `(list* ',function getter ,@other-args ,rest-arg)
76                                `(list ',function getter ,@other-args)))
77                     let-list)
78               `(let* ,(nreverse let-list)
79                 ,setter))))))))
81(define-modify-macro incf-complex (&optional (delta 1)) +
82  "The first argument is some location holding a number.  This number is
83   incremented by the second argument, DELTA, which defaults to 1.")
85(define-modify-macro decf-complex (&optional (delta 1)) -
86  "The first argument is some location holding a number.  This number is
87   decremented by the second argument, DELTA, which defaults to 1.")
89(defmacro incf (place &optional (delta 1))
90  (cond ((symbolp place)
91         (cond ((constantp delta)
92                `(setq ,place (+ ,place ,delta)))
93               (t
94                ;; See section 5.1.3.
95                (let ((temp (gensym)))
96                  `(let ((,temp ,delta))
97                     (setq ,place (+ ,place ,temp)))))))
98        ((and (consp place) (eq (car place) 'THE))
99         (let ((res (gensym)))
100           `(let ((,res (the ,(second place) (+ ,place ,delta))))
101              (setf ,(third place) ,res))))
102        (t
103         `(incf-complex ,place ,delta))))
105(defmacro decf (place &optional (delta 1))
106  (cond ((symbolp place)
107         (cond ((constantp delta)
108                `(setq ,place (- ,place ,delta)))
109               (t
110                ;; See section 5.1.3.
111                (let ((temp (gensym)))
112                  `(let ((,temp ,delta))
113                     (setq ,place (- ,place ,temp)))))))
114        ((and (consp place) (eq (car place) 'THE))
115         (let ((res (gensym)))
116           `(let ((,res (the ,(second place) (- ,place ,delta))))
117              (setf ,(third place) ,res))))
118        (t
119         `(decf-complex ,place ,delta))))
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