source: trunk/abcl/src/org/armedbear/lisp/assert.lisp @ 14215

Last change on this file since 14215 was 11391, checked in by vvoutilainen, 12 years ago

ABCL license is GPL + Classpath exception. This was intended
by Peter Graves, the original author. For reference, see

  • Property svn:eol-style set to native
  • Property svn:keywords set to Id
File size: 3.1 KB
1;;; assert.lisp
3;;; Copyright (C) 2003-2005 Peter Graves
4;;; $Id: assert.lisp 11391 2008-11-15 22:38:34Z vvoutilainen $
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 CMUCL.
34(in-package #:system)
36(defmacro assert (test-form &optional places datum &rest arguments)
37  "Signals an error if the value of test-form is nil.  Continuing from this
38   error using the CONTINUE restart will allow the user to alter the value of
39   some locations known to SETF and start over with test-form.  Returns nil."
40  `(loop
41     (when ,test-form (return nil))
42     (assert-error ',test-form ',places ,datum ,@arguments)
43     ,@(mapcar #'(lambda (place)
44                  `(setf ,place (assert-prompt ',place ,place)))
45         places)))
47(defun assert-error (assertion places datum &rest arguments)
48  (declare (ignore places))
49  (let ((c (if datum
50               (coerce-to-condition
51                datum arguments
52                'simple-error 'error)
53               (make-condition 'simple-error
54                               :format-control "The assertion ~S failed."
55                               :format-arguments (list assertion)))))
56    (restart-case (error c)
57                  (continue ()
58                            :report (lambda (stream) (format stream "Retry assertion."))
59                            nil))))
62(defun assert-prompt (name value)
63  (cond ((y-or-n-p "The old value of ~S is ~S.~%Do you want to supply a new value? "
64       name value)
65         (fresh-line *query-io*)
66   (format *query-io* "Type a form to be evaluated:~%")
67   (flet ((read-it () (eval (read *query-io*))))
68     (if (symbolp name) ;help user debug lexical variables
69         (progv (list name) (list value) (read-it))
70         (read-it))))
71  (t value)))
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