org.armedbear.lisp.delete-duplicates.lisp Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of abcl Show documentation
Show all versions of abcl Show documentation
Common Lisp implementation running on the JVM
;;; delete-duplicates.lisp
;;;
;;; Copyright (C) 2003 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.
(in-package "SYSTEM")
(require "EXTENSIBLE-SEQUENCES-BASE")
;;; From CMUCL.
(defun list-delete-duplicates* (list test test-not key from-end start end)
(let ((handle (cons nil list)))
(do ((current (nthcdr start list) (cdr current))
(previous (nthcdr start handle))
(index start (1+ index)))
((or (and end (= index end)) (null current))
(cdr handle))
(if (do ((x (if from-end
(nthcdr (1+ start) handle)
(cdr current))
(cdr x))
(i (1+ index) (1+ i)))
((or (null x)
(and (not from-end) end (= i end))
(eq x current))
nil)
(if (if test-not
(not (funcall test-not
(sys::apply-key key (car current))
(sys::apply-key key (car x))))
(funcall test
(sys::apply-key key (car current))
(sys::apply-key key (car x))))
(return t)))
(rplacd previous (cdr current))
(setq previous (cdr previous))))))
(defun vector-delete-duplicates* (vector test test-not key from-end start end
&optional (length (length vector)))
(when (null end) (setf end (length vector)))
(do ((index start (1+ index))
(jndex start))
((= index end)
(do ((index index (1+ index)) ; copy the rest of the vector
(jndex jndex (1+ jndex)))
((= index length)
(shrink-vector vector jndex)
vector)
(setf (aref vector jndex) (aref vector index))))
(setf (aref vector jndex) (aref vector index))
(unless (position (sys::apply-key key (aref vector index)) vector :key key
:start (if from-end start (1+ index)) :test test
:end (if from-end jndex end) :test-not test-not)
(setq jndex (1+ jndex)))))
(defun delete-duplicates (sequence &rest args &key (test #'eql) test-not
(start 0) from-end end key)
(sequence::seq-dispatch sequence
(if sequence
(list-delete-duplicates* sequence test test-not key from-end start end))
(vector-delete-duplicates* sequence test test-not key from-end start end)
(apply #'sequence:delete-duplicates sequence args)))