source: branches/1.1.x/src/org/armedbear/lisp/defpackage.lisp

;;; defpackage.lisp
;;;
;;; Copyright (C) 2003-2007 Peter Graves
;;; $Id: defpackage.lisp 11391 2008-11-15 22:38:34Z vvoutilainen $
;;;
;;; 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, 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")

;;; Adapted from CMUCL.

(defun designated-package-name (designator)
  (cond ((packagep designator)
         (package-name designator))
        (t
         (string designator))))

(defun stringify-names (names)
  (mapcar #'string names))

(defun check-disjoint (&rest args)
  (let ((rest-args args))
    (dolist (arg1 args)
      (let ((key1 (car arg1))
            (set1 (cdr arg1)))
        (setq rest-args (cdr rest-args))
        (dolist (arg2 rest-args)
          (let* ((key2 (car arg2))
                 (set2 (cdr arg2))
                 (common (remove-duplicates (intersection set1 set2 :test #'string=))))
            (when common
              (error 'program-error
                     :format-control
                     "Parameters ~S and ~S must be disjoint, but have common elements: ~S"
                     :format-arguments
                     (list key1 key2 common)))))))))

(defun ensure-available-symbols (symbols)
   symbols)

(defmacro defpackage (package &rest options)
  (let ((nicknames nil)
  (size nil)
  (shadows nil)
  (shadowing-imports nil)
  (use nil)
  (use-p nil)
  (imports nil)
  (interns nil)
  (exports nil)
  (doc nil))
    (dolist (option options)
      (unless (consp option)
  (error 'program-error "bad DEFPACKAGE option: ~S" option))
      (case (car option)
  (:nicknames
   (setq nicknames (stringify-names (cdr option))))
  (:size
   (cond (size
    (error 'program-error "can't specify :SIZE twice"))
         ((and (consp (cdr option))
         (typep (second option) 'unsigned-byte))
    (setq size (second option)))
         (t
    (error 'program-error
     "bad :SIZE, must be a positive integer: ~S"
     (second option)))))
  (:shadow
   (let ((new (stringify-names (cdr option))))
     (setq shadows (append shadows new))))
  (:shadowing-import-from
   (let ((package-name (designated-package-name (cadr option)))
         (symbol-names (stringify-names (cddr option))))
     (let ((assoc (assoc package-name shadowing-imports
             :test #'string=)))
       (if assoc
     (setf (cdr assoc) (append (cdr assoc) symbol-names))
     (setq shadowing-imports
           (acons package-name symbol-names shadowing-imports))))))
  (:use
   (let ((new (mapcar #'designated-package-name (cdr option))))
     (setq use (delete-duplicates (nconc use new) :test #'string=))
     (setq use-p t)))
  (:import-from
   (let ((package-name (designated-package-name (cadr option)))
         (symbol-names (stringify-names (cddr option))))
     (let ((assoc (assoc package-name imports
             :test #'string=)))
       (if assoc
     (setf (cdr assoc) (append (cdr assoc) symbol-names))
     (setq imports (acons package-name symbol-names imports))))))
  (:intern
   (let ((new (stringify-names (cdr option))))
     (setq interns (append interns new))))
  (:export
   (let ((new (stringify-names (cdr option))))
     (setq exports (append exports new))))
  (:documentation
   (when doc
     (error 'program-error "can't specify :DOCUMENTATION twice"))
   (setq doc (coerce (cadr option) 'simple-string)))
  (t
   (error 'program-error "bad DEFPACKAGE option: ~S" option))))
    (check-disjoint `(:intern ,@interns) `(:export  ,@exports))
    (check-disjoint `(:intern ,@interns)
        `(:import-from
          ,@(apply #'append (mapcar #'rest imports)))
        `(:shadow ,@shadows)
        `(:shadowing-import-from
          ,@(apply #'append (mapcar #'rest shadowing-imports))))
    `(%defpackage ,(string package) ',nicknames ',size
                  ',shadows (ensure-available-symbols ',shadowing-imports)
                  ',(if use-p use nil)
                  (ensure-available-symbols ',imports) ',interns ',exports ',doc)))