/usr/lib/s9fes/flatten.scm is in scheme9 2010.11.13-2.
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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 | ; Scheme 9 from Empty Space, Function Library
; By Nils M Holm, 2009
; See the LICENSE file of the S9fES package for terms of use
;
; (flatten pair) ==> list
;
; Convert tree to flat list.
;
; Example: (flatten '(a (b ((c) d . e)))) ==> (a b c d e)
(define (flatten x)
(letrec
((f (lambda (x r)
(cond ((null? x)
r)
((pair? x)
(f (car x)
(f (cdr x) r)))
(else
(cons x r))))))
(f x '())))
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