source: trunk/abcl/src/org/armedbear/lisp/with-output-to-string.lisp

Last change on this file was 15569, checked in by Mark Evenson, 2 years ago

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1;;; with-output-to-string.lisp
2;;;
3;;; Copyright (C) 2003-2005 Peter Graves
4;;; $Id: with-output-to-string.lisp 15569 2022-03-19 12:50:18Z mevenson $
5;;;
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.
10;;;
11;;; This program is distributed in the hope that it will be useful,
12;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
13;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14;;; GNU General Public License for more details.
15;;;
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.
19;;;
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.
31
32(in-package #:system)
33
34;;; From SBCL.
35(defmacro with-output-to-string ((var &optional string &key (element-type ''character))
36                                 &body body)
37  "If STRING is specified, it must be a string with a fill pointer;
38   the output is incrementally appended to the string (as if by use of
39   VECTOR-PUSH-EXTEND)."
40  (multiple-value-bind (forms decls) (parse-body body)
41    (if string
42        (let ((ignored (gensym)))
43          `(let ((,var (make-fill-pointer-output-stream ,string))
44                 (,ignored ,element-type))
45             (declare (ignore ,ignored))
46             ,@decls
47             (unwind-protect
48                 (progn ,@forms)
49               (close ,var))))
50        `(let ((,var (make-string-output-stream :element-type ,element-type)))
51           ,@decls
52           (unwind-protect
53               (progn ,@forms)
54             (close ,var))
55           (get-output-stream-string ,var)))))
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