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;;; with-output-to-string.lisp
;;;
;;; Copyright (C) 2003-2005 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.
(in-package #:system)
;;; From SBCL.
(defmacro with-output-to-string ((var &optional string &key (element-type ''character))
&body body)
"If STRING is specified, it must be a string with a fill pointer;
the output is incrementally appended to the string (as if by use of
VECTOR-PUSH-EXTEND)."
(multiple-value-bind (forms decls) (parse-body body)
(if string
(let ((ignored (gensym)))
`(let ((,var (make-fill-pointer-output-stream ,string))
(,ignored ,element-type))
(declare (ignore ,ignored))
,@decls
(unwind-protect
(progn ,@forms)
(close ,var))))
`(let ((,var (make-string-output-stream :element-type ,element-type)))
,@decls
(unwind-protect
(progn ,@forms)
(close ,var))
(get-output-stream-string ,var)))))
