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;;; defpackage.lisp
;;;
;;; Copyright (C) 2003-2007 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., 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)
(local-nicknames 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)))
(:local-nicknames
(dolist (nickdecl (cdr option))
(unless (= (length nickdecl) 2)
(error 'program-error "Malformed local nickname declaration ~A"
nickdecl))
(let ((local-nickname (string (first nickdecl)))
(package-name (designated-package-name (second nickdecl))))
(when (member local-nickname '("CL" "COMMON-LISP" "KEYWORD")
:test #'string=)
(cerror "Continue anyway"
(format nil "Trying to define a local nickname for package ~A"
local-nickname)))
(when (member local-nickname (list* package nicknames)
:test #'string=)
(cerror "Continue anyway"
"Trying to override the name or a nickname (~A) ~
with a local nickname for another package ~A"
local-nickname package-name))
(push (list local-nickname package-name) local-nicknames))))
(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
',local-nicknames ',doc)))
