114 lines
3 KiB
Scheme
114 lines
3 KiB
Scheme
;;; From Guile-1.8
|
|
|
|
;; Copyright (C) 2001, 2002, 2003, 2004, 2005, 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 2.1 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
|
|
|
|
;;; Author: Martin Grabmueller <mgrabmue@cs.tu-berlin.de>
|
|
;;; Date: 2001-06-06
|
|
|
|
;;; Searching
|
|
|
|
;; Internal helper procedure. Map `f' over the single list `ls'.
|
|
;;
|
|
(define map1 map)
|
|
|
|
(define (any pred ls . lists)
|
|
(if (null? lists)
|
|
(any1 pred ls)
|
|
(let lp ((lists (cons ls lists)))
|
|
(cond ((any1 null? lists)
|
|
#f)
|
|
((any1 null? (map1 cdr lists))
|
|
(apply pred (map1 car lists)))
|
|
(else
|
|
(or (apply pred (map1 car lists)) (lp (map1 cdr lists))))))))
|
|
|
|
(define (any1 pred ls)
|
|
(let lp ((ls ls))
|
|
(cond ((null? ls)
|
|
#f)
|
|
((null? (cdr ls))
|
|
(pred (car ls)))
|
|
(else
|
|
(or (pred (car ls)) (lp (cdr ls)))))))
|
|
|
|
(define (every pred ls . lists)
|
|
(if (null? lists)
|
|
(every1 pred ls)
|
|
(let lp ((lists (cons ls lists)))
|
|
(cond ((any1 null? lists)
|
|
#t)
|
|
((any1 null? (map1 cdr lists))
|
|
(apply pred (map1 car lists)))
|
|
(else
|
|
(and (apply pred (map1 car lists)) (lp (map1 cdr lists))))))))
|
|
|
|
(define (every1 pred ls)
|
|
(let lp ((ls ls))
|
|
(cond ((null? ls)
|
|
#t)
|
|
((null? (cdr ls))
|
|
(pred (car ls)))
|
|
(else
|
|
(and (pred (car ls)) (lp (cdr ls)))))))
|
|
|
|
(define (list-index pred clist1 . rest)
|
|
(if (null? rest)
|
|
(let lp ((l clist1) (i 0))
|
|
(if (null? l)
|
|
#f
|
|
(if (pred (car l))
|
|
i
|
|
(lp (cdr l) (+ i 1)))))
|
|
(let lp ((lists (cons clist1 rest)) (i 0))
|
|
(cond ((any1 null? lists)
|
|
#f)
|
|
((apply pred (map car lists)) i)
|
|
(else
|
|
(lp (map cdr lists) (+ i 1)))))))
|
|
|
|
;;; Set operations on lists
|
|
|
|
(define (lset-union = . rest)
|
|
(let ((acc '()))
|
|
(for-each (lambda (lst)
|
|
(if (null? acc)
|
|
(set! acc lst)
|
|
(for-each (lambda (elem)
|
|
(if (not (member elem acc =))
|
|
(set! acc (cons elem acc))))
|
|
lst)))
|
|
rest)
|
|
acc))
|
|
|
|
(define (lset-intersection = list1 . rest)
|
|
(let lp ((l list1) (acc '()))
|
|
(if (null? l)
|
|
(reverse! acc)
|
|
(if (every (lambda (ll) (member (car l) ll =)) rest)
|
|
(lp (cdr l) (cons (car l) acc))
|
|
(lp (cdr l) acc)))))
|
|
|
|
(define (lset-difference = list1 . rest)
|
|
(if (null? rest)
|
|
list1
|
|
(let lp ((l list1) (acc '()))
|
|
(if (null? l)
|
|
(reverse! acc)
|
|
(if (any (lambda (ll) (member (car l) ll =)) rest)
|
|
(lp (cdr l) acc)
|
|
(lp (cdr l) (cons (car l) acc)))))))
|