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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN""http://www.w3.org/TR/html4/loose.dtd">
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><H1
><A
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>split</H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN342"
></A
><H2
>Name</H2
>split&nbsp;--&nbsp;Splits string at whitespace and returns the resulting list of tokens</DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN345"
></A
><H2
>Synopsis</H2
><PRE
CLASS="SYNOPSIS"
>(split str #!optional (whitespace '(#\space)))</PRE
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN348"
></A
><H2
>Description</H2
><P
>Given a string containing delimited tokens, return a list
of the tokens in string form.</P
><P
></P
><DIV
CLASS="VARIABLELIST"
><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
></DL
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN362"
></A
><H2
>Author</H2
><P
>David Megginson, &lt;dmeggins@uottawa.ca&gt;</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN365"
></A
><H2
>Source Code</H2
><PRE
CLASS="PROGRAMLISTING"
>(define (split str #!optional (whitespace '(#\space)))
  ;; Splits string at whitespace and returns the resulting list of tokens
  (let loop ((characters (string-&#62;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-&#62;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-&#62;string (reverse current-word))
				    tokens))))
		   ; We are reading a non-space
		   (#t
		    (loop rest (cons c current-word) tokens))))))))</PRE
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