1;;;; List functions not provided in R5RS or srfi-1 2 3;;; Copyright (C) 2003, 2006 Free Software Foundation, Inc. 4;;; 5;;;; This library is free software; you can redistribute it and/or 6;;;; modify it under the terms of the GNU Lesser General Public 7;;;; License as published by the Free Software Foundation; either 8;;;; version 3 of the License, or (at your option) any later version. 9;;;; 10;;;; This library is distributed in the hope that it will be useful, 11;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of 12;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13;;;; Lesser General Public License for more details. 14;;;; 15;;;; You should have received a copy of the GNU Lesser General Public 16;;;; License along with this library; if not, write to the Free Software 17;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 18 19(define-module (ice-9 list) 20 :export (rassoc rassv rassq)) 21 22(define (generic-rassoc key alist =) 23 (let loop ((ls alist)) 24 (and (not (null? ls)) 25 (if (= key (cdar ls)) 26 (car ls) 27 (loop (cdr ls)))))) 28 29(define (rassoc key alist . =) 30 (generic-rassoc key alist (if (null? =) equal? (car =)))) 31 32(define (rassv key alist) 33 (generic-rassoc key alist eqv?)) 34 35(define (rassq key alist) 36 (generic-rassoc key alist eq?)) 37