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53befeb700
(Not quite finished, the following will be done tomorrow. module/srfi/*.scm module/rnrs/*.scm module/scripts/*.scm testsuite/*.scm guile-readline/* )
36 lines
1.3 KiB
Scheme
36 lines
1.3 KiB
Scheme
;;;; List functions not provided in R5RS or srfi-1
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;;; Copyright (C) 2003, 2006 Free Software Foundation, Inc.
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;;;
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;;;; This library is free software; you can redistribute it and/or
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;;;; modify it under the terms of the GNU Lesser General Public
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;;;; License as published by the Free Software Foundation; either
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;;;; version 3 of the License, or (at your option) any later version.
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;;;;
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;;;; This library is distributed in the hope that it will be useful,
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;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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;;;; Lesser General Public License for more details.
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;;;;
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;;;; You should have received a copy of the GNU Lesser General Public
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;;;; License along with this library; if not, write to the Free Software
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;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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(define-module (ice-9 list)
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:export (rassoc rassv rassq))
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(define (generic-rassoc key alist =)
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(let loop ((ls alist))
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(and (not (null? ls))
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(if (= key (cdar ls))
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(car ls)
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(loop (cdr ls))))))
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(define (rassoc key alist . =)
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(generic-rassoc key alist (if (null? =) equal? (car =))))
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(define (rassv key alist)
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(generic-rassoc key alist eqv?))
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(define (rassq key alist)
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(generic-rassoc key alist eq?))
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