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Common Lisp implementation running on the JVM
;;; nsubstitute.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.
;;; NSUBSTITUTE (from CMUCL)
(in-package "SYSTEM")
;;; 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)))
(defun nlist-substitute* (new old sequence test test-not start end count key)
(do ((list (nthcdr start sequence) (cdr list))
(index start (1+ index)))
((or (= index end) (null list) (= count 0)) sequence)
(when (if test-not
(not (funcall test-not old (apply-key key (car list))))
(funcall test old (apply-key key (car list))))
(rplaca list new)
(setq count (1- count)))))
(defun nvector-substitute* (new old sequence incrementer
test test-not start end count key)
(do ((index start (+ index incrementer)))
((or (= index end) (= count 0)) sequence)
(when (if test-not
(not (funcall test-not old (apply-key key (aref sequence index))))
(funcall test old (apply-key key (aref sequence index))))
(setf (aref sequence index) new)
(setq count (1- count)))))
(defun nsubstitute (new old sequence &key from-end (test #'eql) test-not
end count key (start 0))
(let ((end (or end (length sequence)))
(count (real-count count)))
(if (listp sequence)
(if from-end
(let ((length (length sequence)))
(nreverse (nlist-substitute*
new old (nreverse sequence)
test test-not (- length end) (- length start) count key)))
(nlist-substitute* new old sequence
test test-not start end count key))
(if from-end
(nvector-substitute* new old sequence -1
test test-not (1- end) (1- start) count key)
(nvector-substitute* new old sequence 1
test test-not start end count key)))))
(defun nlist-substitute-if* (new test sequence start end count key)
(do ((list (nthcdr start sequence) (cdr list))
(index start (1+ index)))
((or (= index end) (null list) (= count 0)) sequence)
(when (funcall test (apply-key key (car list)))
(rplaca list new)
(setq count (1- count)))))
(defun nvector-substitute-if* (new test sequence incrementer
start end count key)
(do ((index start (+ index incrementer)))
((or (= index end) (= count 0)) sequence)
(when (funcall test (apply-key key (aref sequence index)))
(setf (aref sequence index) new)
(setq count (1- count)))))
(defun nsubstitute-if (new test sequence &key from-end (start 0) end count key)
(let ((end (or end (length sequence)))
(count (real-count count)))
(if (listp sequence)
(if from-end
(let ((length (length sequence)))
(nreverse (nlist-substitute-if*
new test (nreverse sequence)
(- length end) (- length start) count key)))
(nlist-substitute-if* new test sequence
start end count key))
(if from-end
(nvector-substitute-if* new test sequence -1
(1- end) (1- start) count key)
(nvector-substitute-if* new test sequence 1
start end count key)))))
(defun nlist-substitute-if-not* (new test sequence start end count key)
(do ((list (nthcdr start sequence) (cdr list))
(index start (1+ index)))
((or (= index end) (null list) (= count 0)) sequence)
(when (not (funcall test (apply-key key (car list))))
(rplaca list new)
(setq count (1- count)))))
(defun nvector-substitute-if-not* (new test sequence incrementer
start end count key)
(do ((index start (+ index incrementer)))
((or (= index end) (= count 0)) sequence)
(when (not (funcall test (apply-key key (aref sequence index))))
(setf (aref sequence index) new)
(setq count (1- count)))))
(defun nsubstitute-if-not (new test sequence &key from-end (start 0)
end count key)
(let ((end (or end (length sequence)))
(count (real-count count)))
(if (listp sequence)
(if from-end
(let ((length (length sequence)))
(nreverse (nlist-substitute-if-not*
new test (nreverse sequence)
(- length end) (- length start) count key)))
(nlist-substitute-if-not* new test sequence
start end count key))
(if from-end
(nvector-substitute-if-not* new test sequence -1
(1- end) (1- start) count key)
(nvector-substitute-if-not* new test sequence 1
start end count key)))))