| ;;;; List functions not provided in R5RS or srfi-1 | |
| ;;; Copyright (C) 2003, 2006 Free Software Foundation, Inc. | |
| ;;; | |
| ;;;; This library is free software; you can redistribute it and/or | |
| ;;;; modify it under the terms of the GNU Lesser General Public | |
| ;;;; License as published by the Free Software Foundation; either | |
| ;;;; version 3 of the License, or (at your option) any later version. | |
| ;;;; | |
| ;;;; This library 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 | |
| ;;;; Lesser General Public License for more details. | |
| ;;;; | |
| ;;;; You should have received a copy of the GNU Lesser General Public | |
| ;;;; License along with this library; if not, write to the Free Software | |
| ;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
| (define-module (ice-9 list) | |
| :export (rassoc rassv rassq)) | |
| (define (generic-rassoc key alist =) | |
| (let loop ((ls alist)) | |
| (and (not (null? ls)) | |
| (if (= key (cdar ls)) | |
| (car ls) | |
| (loop (cdr ls)))))) | |
| (define (rassoc key alist . =) | |
| (generic-rassoc key alist (if (null? =) equal? (car =)))) | |
| (define (rassv key alist) | |
| (generic-rassoc key alist eqv?)) | |
| (define (rassq key alist) | |
| (generic-rassoc key alist eq?)) | |