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Diffstat (limited to 'module/rnrs/lists.scm')
-rw-r--r-- | module/rnrs/lists.scm | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/module/rnrs/lists.scm b/module/rnrs/lists.scm new file mode 100644 index 000000000..0671e7753 --- /dev/null +++ b/module/rnrs/lists.scm @@ -0,0 +1,55 @@ +;;; lists.scm --- The R6RS list utilities library + +;; Copyright (C) 2010 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 + + +(library (rnrs lists (6)) + (export find for-all exists filter partition fold-left fold-right remp remove + remv remq memp member memv memq assp assoc assv assq cons*) + (import (rnrs base (6)) + (only (guile) filter member memv memq assoc assv assq cons*) + (rename (only (srfi srfi-1) any + every + remove + member + assoc + find + partition + fold-right + filter-map) + (any exists) + (every for-all) + (remove remp) + + (member memp-internal) + (assoc assp-internal))) + + (define (fold-left combine nil list . lists) + (define (fold nil lists) + (if (exists null? lists) + nil + (fold (apply combine nil (map car lists)) + (map cdr lists)))) + (fold nil (cons list lists))) + + (define (remove obj list) (remp (lambda (elt) (equal? obj elt)) list)) + (define (remv obj list) (remp (lambda (elt) (eqv? obj elt)) list)) + (define (remq obj list) (remp (lambda (elt) (eq? obj elt)) list)) + + (define (memp pred list) (memp-internal #f list (lambda (x y) (pred y)))) + (define (assp pred list) (assp-internal #f list (lambda (x y) (pred y)))) +) |