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Common Lisp implementation running on the JVM
;;; package.lisp
;;;
;;; Copyright (C) 2008 Erik Huelsmann
;;; $Id: package.lisp 12418 2010-02-05 15:41:42Z mevenson $
;;;
;;; 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")
;; Redefines make-package from boot.lisp
(defun make-package (name &key nicknames use)
(restart-case
(progn
(when (find-package name)
(error 'simple-error "Package ~A already exists." name))
(dolist (nick nicknames)
(when (find-package nick)
(error 'package-error :package nick)))
(%make-package name nicknames use))
(use-existing-package ()
:report "Use existing package"
(return-from make-package (find-package name)))))
;; Redefines function from defpackage.lisp, because there it's lacking restart-case
(defun ensure-available-symbols (imports)
(remove nil
(mapcar #'(lambda (package-and-symbols)
(let* ((package (find-package (designated-package-name (car package-and-symbols))))
(new-symbols
(remove nil
(mapcar #'(lambda (sym)
(restart-case
(progn
(unless (find-symbol sym package)
(error 'package-error
"The symbol ~A is not present in package ~A." sym (package-name package)))
sym)
(skip ()
:report "Skip this symbol."
nil)))
(cdr package-and-symbols)))))
(when new-symbols
(cons package new-symbols))))
imports)))
(defun import (symbols &optional (package *package* package-supplied-p))
(dolist (symbol (if (listp symbols) symbols (list symbols)))
(let* ((sym-name (string symbol))
(local-sym (find-symbol sym-name package)))
(restart-case
(progn
(when (and local-sym (not (eql symbol local-sym)))
(error 'package-error
"Different symbol (~A) with the same name already accessible in package ~A."
local-sym (package-name package)))
(if package-supplied-p
(%import (list symbol) package) ;; in order to pass NIL, wrap in a list
(%import (list symbol))))
(unintern-existing ()
:report (lambda (s) (format s "Unintern ~S and continue" local-sym))
(unintern local-sym)
(%import symbol))
(skip ()
:report "Skip symbol"))))
T)