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;;; search.lisp
;;;
;;; Copyright (C) 2003-2004 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")
(export '(simple-search))
;; From CMUCL.
(eval-when (:compile-toplevel :execute)
(defmacro compare-elements (elt1 elt2)
`(if test-not
(if (funcall test-not (apply-key key ,elt1) (apply-key key ,elt2))
(return nil)
t)
(if (not (funcall test (apply-key key ,elt1) (apply-key key ,elt2)))
(return nil)
t)))
(defmacro search-compare-list-list (main sub)
`(do ((main ,main (cdr main))
(jndex start1 (1+ jndex))
(sub (nthcdr start1 ,sub) (cdr sub)))
((or (null main) (null sub) (= end1 jndex))
t)
(compare-elements (car sub) (car main))))
(defmacro search-compare-list-vector (main sub)
`(do ((main ,main (cdr main))
(index start1 (1+ index)))
((or (null main) (= index end1)) t)
(compare-elements (aref ,sub index) (car main))))
(defmacro search-compare-vector-list (main sub index)
`(do ((sub (nthcdr start1 ,sub) (cdr sub))
(jndex start1 (1+ jndex))
(index ,index (1+ index)))
((or (= end1 jndex) (null sub)) t)
(compare-elements (car sub) (aref ,main index))))
(defmacro search-compare-vector-vector (main sub index)
`(do ((index ,index (1+ index))
(sub-index start1 (1+ sub-index)))
((= sub-index end1) t)
(compare-elements (aref ,sub sub-index) (aref ,main index))))
(defmacro search-compare (main-type main sub index)
(if (eq main-type 'list)
`(if (listp ,sub)
(search-compare-list-list ,main ,sub)
(search-compare-list-vector ,main ,sub))
`(if (listp ,sub)
(search-compare-vector-list ,main ,sub ,index)
(search-compare-vector-vector ,main ,sub ,index))))
(defmacro list-search (main sub)
`(do ((main (nthcdr start2 ,main) (cdr main))
(index2 start2 (1+ index2))
(terminus (- end2 (- end1 start1)))
(last-match ()))
((> index2 terminus) last-match)
(if (search-compare list main ,sub index2)
(if from-end
(setq last-match index2)
(return index2)))))
(defmacro vector-search (main sub)
`(do ((index2 start2 (1+ index2))
(terminus (- end2 (- end1 start1)))
(last-match ()))
((> index2 terminus) last-match)
(if (search-compare vector ,main ,sub index2)
(if from-end
(setq last-match index2)
(return index2)))))
) ; eval-when
(defun search (sequence1 sequence2 &rest args &key from-end (test #'eql)
test-not (start1 0) end1 (start2 0) end2 key)
(let ((end1 (or end1 (length sequence1)))
(end2 (or end2 (length sequence2))))
(when key
(setq key (coerce-to-function key)))
(sequence::seq-dispatch sequence2
(list-search sequence2 sequence1)
(vector-search sequence2 sequence1)
(apply #'sequence:search sequence1 sequence2 args))))
(defun simple-search (sequence1 sequence2)
(cond ((and (stringp sequence1) (stringp sequence2))
(simple-string-search sequence1 sequence2))
((vectorp sequence2)
(simple-vector-search sequence1 sequence2))
(t
(search sequence1 sequence2 :from-end nil))))
