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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
NAME="STRIP"
></A
>strip</H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN372"
></A
><H2
>Name</H2
>strip -- Strip leading and trailing characters off of a string</DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN375"
></A
><H2
>Synopsis</H2
><PRE
CLASS="SYNOPSIS"
>(strip str #!optional (stripchars '(#\space #\
#\U-0009)))</PRE
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN378"
></A
><H2
>Description</H2
><P
>Strips leading and trailing characters in the <TT
CLASS="LITERAL"
>stripchars</TT
> list
off of a string and returns the stripped string.</P
><P
></P
><DIV
CLASS="VARIABLELIST"
><DL
><DT
><TT
CLASS="LITERAL"
>str</TT
></DT
><DD
><P
>The string to strip</P
></DD
><DT
><TT
CLASS="LITERAL"
>stripchars</TT
></DT
><DD
><P
>A list of characters that should
be stripped.</P
></DD
></DL
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN393"
></A
><H2
>Author</H2
><P
>Norman Walsh, <ndw@nwalsh.com></P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN396"
></A
><H2
>Source Code</H2
><PRE
CLASS="PROGRAMLISTING"
>(define (strip str #!optional (stripchars '(#\space #\
#\U-0009)))
;; Strip leading and trailing characters off of a string
(let* ((startpos (let loop ((count 0))
(if (>= count (string-length str))
(string-length str)
(if (member (string-ref str count) stripchars)
(loop (+ count 1))
count))))
(tailstr (substring str startpos (string-length str)))
(endpos (let loop ((count (- (string-length tailstr) 1)))
(if (< count 1)
0
(if (member (string-ref tailstr count) stripchars)
(loop (- count 1))
count)))))
(if (or (< endpos 0)
(string=? tailstr ""))
""
(substring tailstr 0 (+ endpos 1)))))</PRE
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