;;; count.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 "COMMON-LISP")
(require "EXTENSIBLE-SEQUENCES-BASE")
;;; From CMUCL.
(defmacro vector-count-if (not-p from-end-p predicate sequence)
(let ((next-index (if from-end-p '(1- index) '(1+ index)))
(pred `(funcall ,predicate (sys::apply-key key (aref ,sequence index)))))
`(let ((%start ,(if from-end-p '(1- end) 'start))
(%end ,(if from-end-p '(1- start) 'end)))
(do ((index %start ,next-index)
(count 0))
((= index %end) count)
(,(if not-p 'unless 'when) ,pred
(setq count (1+ count)))))))
(defmacro list-count-if (not-p from-end-p predicate sequence)
(let ((pred `(funcall ,predicate (sys::apply-key key (pop sequence)))))
`(let ((%start ,(if from-end-p '(- length end) 'start))
(%end ,(if from-end-p '(- length start) 'end))
(sequence ,(if from-end-p '(reverse sequence) 'sequence)))
(do ((sequence (nthcdr %start ,sequence))
(index %start (1+ index))
(count 0))
((or (= index %end) (null sequence)) count)
(,(if not-p 'unless 'when) ,pred
(setq count (1+ count)))))))
(defun count (item sequence &rest args &key from-end (test #'eql test-p) (test-not nil test-not-p)
(start 0) end key)
(when (and test-p test-not-p)
(error "test and test-not both supplied"))
(let* ((length (length sequence))
(end (or end length)))
(let ((%test (if test-not-p
(lambda (x)
(not (funcall test-not item x)))
(lambda (x)
(funcall test item x)))))
(sequence::seq-dispatch sequence
(if from-end
(list-count-if nil t %test sequence)
(list-count-if nil nil %test sequence))
(if from-end
(vector-count-if nil t %test sequence)
(vector-count-if nil nil %test sequence))
(apply #'sequence:count item sequence args)))))
(defun count-if (test sequence &rest args &key from-end (start 0) end key)
(let* ((length (length sequence))
(end (or end length)))
(sequence::seq-dispatch sequence
(if from-end
(list-count-if nil t test sequence)
(list-count-if nil nil test sequence))
(if from-end
(vector-count-if nil t test sequence)
(vector-count-if nil nil test sequence))
(apply #'sequence:count-if test sequence args))))
(defun count-if-not (test sequence &rest args &key from-end (start 0) end key)
(let* ((length (length sequence))
(end (or end length)))
(sequence::seq-dispatch sequence
(if from-end
(list-count-if t t test sequence)
(list-count-if t nil test sequence))
(if from-end
(vector-count-if t t test sequence)
(vector-count-if t nil test sequence))
(apply #'sequence:count-if-not test sequence args))))