source: branches/1.1.x/src/org/armedbear/lisp/define-symbol-macro.lisp

;;; define-symbol-macro.lisp
;;;
;;; Copyright (C) 2003-2004 Peter Graves
;;; $Id: define-symbol-macro.lisp 13695 2011-11-08 23:24:05Z astalla $
;;;
;;; 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.
;;;
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;;; 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
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;;; exception statement from your version.

(in-package "SYSTEM")

(defun %define-symbol-macro (symbol expansion)
  (%set-symbol-macro symbol (make-symbol-macro expansion))
  symbol)

(defmacro define-symbol-macro (symbol expansion)
  (when (special-variable-p symbol) ;;TODO astalla also check local declarations?
    (error 'program-error "~S has already been defined as a global variable." symbol))
  `(eval-when (:compile-toplevel :load-toplevel :execute)
     (%define-symbol-macro ',symbol ',expansion)))