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(length-string-number-part lenstr)
Given a length as a string, return the numeric part.
"100pt" returns "100". "30" returns "30". "in" returns "".
Norman Walsh, <norm@berkshire.net>
(define (length-string-number-part lenstr)
;; Returns the numeric part of a length string
(let ((digits '(#\0 #\1 #\2 #\3 #\4 #\5 #\6 #\7 #\8 #\9 #\.)))
(let loop ((chars (string->list lenstr))
(number-part ""))
(if (or (null? chars) (not (member (car chars) digits)))
number-part
(loop (cdr chars) (string-append number-part
(string (car chars))))))))| Prev | Home | Next |
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Copyright © 1997, 1998 Norman Walsh