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44876271 MD |
1 | ;;;; List functions not provided in R5RS or srfi-1 |
2 | ||
cd5fea8d | 3 | ;;; Copyright (C) 2003, 2006 Free Software Foundation, Inc. |
44876271 | 4 | ;;; |
73be1d9e MV |
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 2.1 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 | |
92205699 | 17 | ;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
44876271 MD |
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 | ||
122d66ea | 35 | (define (rassq key alist) |
44876271 | 36 | (generic-rassoc key alist eq?)) |