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Common Lisp implementation running on the JVM
;;; delete.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.
(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-delete (pred)
`(do ((index start (1+ index))
(jndex start)
(number-zapped 0))
((or (= index end) (= number-zapped count))
(do ((index index (1+ index)) ; copy the rest of the vector
(jndex jndex (1+ jndex)))
((= index length)
(shrink-vector sequence jndex))
(aset sequence jndex (aref sequence index))))
(aset sequence jndex (aref sequence index))
(if ,pred
(setq number-zapped (1+ number-zapped))
(setq jndex (1+ jndex)))))
(defmacro mumble-delete-from-end (pred)
`(do ((index (1- end) (1- index)) ; find the losers
(number-zapped 0)
(losers ())
this-element
(terminus (1- start)))
((or (= index terminus) (= number-zapped count))
(do ((losers losers) ; delete the losers
(index start (1+ index))
(jndex start))
((or (null losers) (= index end))
(do ((index index (1+ index)) ; copy the rest of the vector
(jndex jndex (1+ jndex)))
((= index length)
(shrink-vector sequence jndex))
(aset sequence jndex (aref sequence index))))
(aset sequence jndex (aref sequence index))
(if (= index (car losers))
(pop losers)
(setq jndex (1+ jndex)))))
(setq this-element (aref sequence index))
(when ,pred
(setq number-zapped (1+ number-zapped))
(push index losers))))
(defmacro normal-mumble-delete ()
`(mumble-delete
(if test-not
(not (funcall test-not item (funcall-key key (aref sequence index))))
(funcall test item (funcall-key key (aref sequence index))))))
(defmacro normal-mumble-delete-from-end ()
`(mumble-delete-from-end
(if test-not
(not (funcall test-not item (funcall-key key this-element)))
(funcall test item (funcall-key key this-element)))))
(defmacro list-delete (pred)
`(let ((handle (cons nil sequence)))
(do ((current (nthcdr start sequence) (cdr current))
(previous (nthcdr start handle))
(index start (1+ index))
(number-zapped 0))
((or (= index end) (= number-zapped count))
(cdr handle))
(cond (,pred
(rplacd previous (cdr current))
(setq number-zapped (1+ number-zapped)))
(t
(setq previous (cdr previous)))))))
(defmacro list-delete-from-end (pred)
`(let* ((reverse (nreverse sequence))
(handle (cons nil reverse)))
(do ((current (nthcdr (- length end) reverse)
(cdr current))
(previous (nthcdr (- length end) handle))
(index start (1+ index))
(number-zapped 0))
((or (= index end) (= number-zapped count))
(nreverse (cdr handle)))
(cond (,pred
(rplacd previous (cdr current))
(setq number-zapped (1+ number-zapped)))
(t
(setq previous (cdr previous)))))))
(defmacro normal-list-delete ()
'(list-delete
(if test-not
(not (funcall test-not item (funcall-key key (car current))))
(funcall test item (funcall-key key (car current))))))
(defmacro normal-list-delete-from-end ()
'(list-delete-from-end
(if test-not
(not (funcall test-not item (funcall-key key (car current))))
(funcall test item (funcall-key key (car current))))))
(defun delete (item sequence &rest args &key from-end (test #'eql) test-not
(start 0) end count key)
(when key
(setq key (coerce-to-function key)))
(let* ((length (length sequence))
(end (or end length))
(count (real-count count)))
(sequence::seq-dispatch sequence
(if from-end
(normal-list-delete-from-end)
(normal-list-delete))
(if from-end
(normal-mumble-delete-from-end)
(normal-mumble-delete))
(apply #'sequence:delete item sequence args))))
(defmacro if-mumble-delete ()
`(mumble-delete
(funcall predicate (funcall-key key (aref sequence index)))))
(defmacro if-mumble-delete-from-end ()
`(mumble-delete-from-end
(funcall predicate (funcall-key key this-element))))
(defmacro if-list-delete ()
'(list-delete
(funcall predicate (funcall-key key (car current)))))
(defmacro if-list-delete-from-end ()
'(list-delete-from-end
(funcall predicate (funcall-key key (car current)))))
(defun delete-if (predicate sequence &rest args &key from-end (start 0)
key end count)
(when key
(setq key (coerce-to-function key)))
(let* ((length (length sequence))
(end (or end length))
(count (real-count count)))
(sequence::seq-dispatch sequence
(if from-end
(if-list-delete-from-end)
(if-list-delete))
(if from-end
(if-mumble-delete-from-end)
(if-mumble-delete))
(apply #'sequence:delete-if predicate sequence args))))
(defmacro if-not-mumble-delete ()
`(mumble-delete
(not (funcall predicate (funcall-key key (aref sequence index))))))
(defmacro if-not-mumble-delete-from-end ()
`(mumble-delete-from-end
(not (funcall predicate (funcall-key key this-element)))))
(defmacro if-not-list-delete ()
'(list-delete
(not (funcall predicate (funcall-key key (car current))))))
(defmacro if-not-list-delete-from-end ()
'(list-delete-from-end
(not (funcall predicate (funcall-key key (car current))))))
(defun delete-if-not (predicate sequence &rest args &key from-end (start 0)
end key count)
(when key
(setq key (coerce-to-function key)))
(let* ((length (length sequence))
(end (or end length))
(count (real-count count)))
(sequence::seq-dispatch sequence
(if from-end
(if-not-list-delete-from-end)
(if-not-list-delete))
(if from-end
(if-not-mumble-delete-from-end)
(if-not-mumble-delete))
(apply #'sequence:delete-if-not predicate sequence args))))