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Port unrolled one-argument for-each from boot-9 to srfi-1

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* module/srfi/srfi-1.scm (for-each): Port unrolled one-argument
  implementation here from the boot-9 version.
This commit is contained in:
Andy Wingo 2014-03-02 12:05:32 +01:00
parent 1a95246a39
commit 3c3de73d4d
1 changed files with 12 additions and 11 deletions
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23
module/srfi/srfi-1.scm
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@ -1,6 +1,6 @@
;;; srfi-1.scm --- List Library
;; Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2009, 2010, 2011 Free Software Foundation, Inc.
;; Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2009, 2010, 2011, 2014 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
@ -606,23 +606,24 @@ has just one element then that's the return value."
(case-lambda
((f l)
(check-arg procedure? f for-each)
(let for-each1 ((hare l) (tortoise l) (move? #f))
(let for-each1 ((hare l) (tortoise l))
(if (pair? hare)
(if move?
(if (eq? tortoise hare)
(begin
(f (car hare))
(let ((hare (cdr hare)))
(if (pair? hare)
(begin
(when (eq? tortoise hare)
(scm-error 'wrong-type-arg "for-each" "Circular list: ~S"
(list l) #f)
(begin
(list l) #f))
(f (car hare))
(for-each1 (cdr hare) (cdr tortoise) #f)))
(begin
(f (car hare))
(for-each1 (cdr hare) tortoise #t)))
(for-each1 (cdr hare) (cdr tortoise)))
(for-each1 hare tortoise))))
(if (not (null? hare))
(scm-error 'wrong-type-arg "for-each" "Not a list: ~S"
(list l) #f)))))
((f l1 . rest)
(check-arg procedure? f for-each)
(let ((len (fold (lambda (ls len)