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>split</H1
><DIV
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><A
NAME="AEN342"
></A
><H2
>Name</H2
>split -- Splits string at whitespace and returns the resulting list of tokens</DIV
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><PRE
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>(split str #!optional (whitespace '(#\space)))</PRE
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><H2
>Description</H2
><P
>Given a string containing delimited tokens, return a list
of the tokens in string form.</P
><P
></P
><DIV
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><DL
><DT
><TT
CLASS="LITERAL"
>str</TT
></DT
><DD
><P
>The string to split.</P
></DD
><DT
><TT
CLASS="LITERAL"
>whitespace</TT
></DT
><DD
><P
>A list of characters that should
be treated as whitespace.</P
></DD
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><DIV
CLASS="REFSECT1"
><A
NAME="AEN362"
></A
><H2
>Author</H2
><P
>David Megginson, <dmeggins@uottawa.ca></P
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NAME="AEN365"
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>Source Code</H2
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>(define (split str #!optional (whitespace '(#\space)))
;; Splits string at whitespace and returns the resulting list of tokens
(let loop ((characters (string->list str)) ; Top-level recursive loop.
(current-word '())
(tokens '()))
; If there are no characters left,
; then we're done!
(cond ((null? characters)
; Is there a token in progress?
(if (null? current-word)
(reverse tokens)
(reverse (cons (list->string (reverse current-word))
tokens))))
; If there are characters left,
; then keep going.
(#t
(let ((c (car characters))
(rest (cdr characters)))
; Are we reading a space?
(cond ((member c whitespace)
(if (null? current-word)
(loop rest '() tokens)
(loop rest
'()
(cons (list->string (reverse current-word))
tokens))))
; We are reading a non-space
(#t
(loop rest (cons c current-word) tokens))))))))</PRE
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