/usr/lib/s9fes/remove.scm is in scheme9 2010.11.13-2.
This file is owned by root:root, with mode 0o644.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 | ; Scheme 9 from Empty Space, Function Library
; By Nils M Holm, 2009
; See the LICENSE file of the S9fES package for terms of use
;
; (remove obj list) ==> list
; (remp procedure^1 list) ==> list
; (remq obj list) ==> list
; (remv obj list) ==> list
;
; (load-from-library "remove.scm")
;
; Remove elements from a list. REMP uses the unary predicate
; PROCEDURE^1 to describe the property of the elements to be
; removed. REMOVE uses EQUAL?, REMV uses EQV?, and REMQ uses
; EQ? to compare each element of LIST to OBJ.
;
; Example: (remp number? '(a 1 b 2 c 3)) ==> (a b c)
; (remove '(b) '(a (b) (c) (b))) ==> (a (c))
; (remq 'b '(a b c b d)) ==> (a c d)
; (remv 3 '(3 1 2 3 1)) ==> (1 2 1)
(load-from-library "filter.scm")
(define (remp p a)
(filter (lambda (x) (not (p x))) a))
(define (make-remover pred)
(lambda (x a)
(letrec
((rem
(lambda (a r)
(cond ((null? a)
(reverse! r))
((pred x (car a))
(rem (cdr a) r))
(else
(rem (cdr a) (cons (car a) r)))))))
(rem a '()))))
(define remq (make-remover eq?))
(define remv (make-remover eqv?))
(define remove (make-remover equal?))
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