;;; with-input-from-string.lisp ;;; ;;; Copyright (C) 2004-2005 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. ;;; Adapted from CMUCL. (in-package "SYSTEM") (defmacro with-input-from-string ((var string &key index start end) &body body) (multiple-value-bind (forms decls) (parse-body body) `(let ((,var ,(cond ((null end) `(make-string-input-stream ,string ,(or start 0))) ((symbolp end) `(if ,end (make-string-input-stream ,string ,(or start 0) ,end) (make-string-input-stream ,string ,(or start 0)))) (t `(make-string-input-stream ,string ,(or start 0) ,end))))) ,@decls (unwind-protect (multiple-value-prog1 (progn ,@forms) ,@(when index `((setf ,index (string-input-stream-current ,var))))) (close ,var)))))