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Common Lisp implementation running on the JVM
;;; remove.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 "DELETE") ; MUMBLE-DELETE-FROM-END
(require "EXTENSIBLE-SEQUENCES-BASE")
;;; From CMUCL.
(defmacro real-count (count)
`(cond ((null ,count) most-positive-fixnum)
((fixnump ,count) (if (minusp ,count) 0 ,count))
((integerp ,count) (if (minusp ,count) 0 most-positive-fixnum))
(t ,count)))
(defmacro mumble-remove-macro (bump left begin finish right pred)
`(do ((index ,begin (,bump index))
(result
(do ((index ,left (,bump index))
(result (make-sequence-like sequence length)))
((= index ,begin) result)
(aset result index (aref sequence index))))
(new-index ,begin)
(number-zapped 0)
(this-element))
((or (= index ,finish) (= number-zapped count))
(do ((index index (,bump index))
(new-index new-index (,bump new-index)))
((= index ,right) (shrink-vector result new-index))
(aset result new-index (aref sequence index))))
(setq this-element (aref sequence index))
(cond (,pred (setq number-zapped (1+ number-zapped)))
(t (aset result new-index this-element)
(setq new-index (,bump new-index))))))
(defmacro mumble-remove (pred)
`(mumble-remove-macro 1+ 0 start end length ,pred))
(defmacro mumble-remove-from-end (pred)
`(let ((sequence (copy-seq sequence)))
(mumble-delete-from-end ,pred)))
(defmacro normal-mumble-remove ()
`(mumble-remove
(if test-not
(not (funcall test-not item (apply-key key this-element)))
(funcall test item (apply-key key this-element)))))
(defmacro normal-mumble-remove-from-end ()
`(mumble-remove-from-end
(if test-not
(not (funcall test-not item (apply-key key this-element)))
(funcall test item (apply-key key this-element)))))
(defmacro if-mumble-remove ()
`(mumble-remove (funcall predicate (apply-key key this-element))))
(defmacro if-mumble-remove-from-end ()
`(mumble-remove-from-end (funcall predicate (apply-key key this-element))))
(defmacro if-not-mumble-remove ()
`(mumble-remove (not (funcall predicate (apply-key key this-element)))))
(defmacro if-not-mumble-remove-from-end ()
`(mumble-remove-from-end
(not (funcall predicate (apply-key key this-element)))))
(defmacro list-remove-macro (pred reverse-p)
`(let* ((sequence ,(if reverse-p
'(reverse sequence)
'sequence))
(%start ,(if reverse-p '(- length end) 'start))
(%end ,(if reverse-p '(- length start) 'end))
(splice (list nil))
(results (do ((index 0 (1+ index))
(before-start splice))
((= index %start) before-start)
(setq splice
(cdr (rplacd splice (list (pop sequence))))))))
(do ((index %start (1+ index))
(this-element)
(number-zapped 0))
((or (= index %end) (= number-zapped count))
(do ((index index (1+ index)))
((null sequence)
,(if reverse-p
'(nreverse (cdr results))
'(cdr results)))
(setq splice (cdr (rplacd splice (list (pop sequence)))))))
(setq this-element (pop sequence))
(if ,pred
(setq number-zapped (1+ number-zapped))
(setq splice (cdr (rplacd splice (list this-element))))))))
(defmacro list-remove (pred)
`(list-remove-macro ,pred nil))
(defmacro list-remove-from-end (pred)
`(list-remove-macro ,pred t))
(defmacro normal-list-remove ()
`(list-remove
(if test-not
(not (funcall test-not item (apply-key key this-element)))
(funcall test item (apply-key key this-element)))))
(defmacro normal-list-remove-from-end ()
`(list-remove-from-end
(if test-not
(not (funcall test-not item (apply-key key this-element)))
(funcall test item (apply-key key this-element)))))
(defmacro if-list-remove ()
`(list-remove
(funcall predicate (apply-key key this-element))))
(defmacro if-list-remove-from-end ()
`(list-remove-from-end
(funcall predicate (apply-key key this-element))))
(defmacro if-not-list-remove ()
`(list-remove
(not (funcall predicate (apply-key key this-element)))))
(defmacro if-not-list-remove-from-end ()
`(list-remove-from-end
(not (funcall predicate (apply-key key this-element)))))
(defun remove (item sequence &rest args &key from-end (test #'eql) test-not
(start 0) end count key)
(let* ((length (length sequence))
(end (or end length))
(count (real-count count)))
(sequence::seq-dispatch sequence
(if from-end
(normal-list-remove-from-end)
(normal-list-remove))
(if from-end
(normal-mumble-remove-from-end)
(normal-mumble-remove))
(apply #'sequence:remove item sequence args))))
(defun remove-if (predicate sequence &rest args &key from-end (start 0)
end count key)
(let* ((length (length sequence))
(end (or end length))
(count (real-count count)))
(sequence::seq-dispatch sequence
(if from-end
(if-list-remove-from-end)
(if-list-remove))
(if from-end
(if-mumble-remove-from-end)
(if-mumble-remove))
(apply #'sequence:remove-if predicate sequence args))))
(defun remove-if-not (predicate sequence &rest args &key from-end (start 0)
end count key)
(let* ((length (length sequence))
(end (or end length))
(count (real-count count)))
(sequence::seq-dispatch sequence
(if from-end
(if-not-list-remove-from-end)
(if-not-list-remove))
(if from-end
(if-not-mumble-remove-from-end)
(if-not-mumble-remove))
(apply #'sequence:remove-if-not predicate sequence args))))