<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN""http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >strip</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK REL="HOME" TITLE="DSSSL Library Reference" HREF="index.html"><LINK REL="UP" TITLE="Miscellaneous" HREF="r300.htm"><LINK REL="PREVIOUS" TITLE="split" HREF="split.html"><LINK REL="NEXT" TITLE="join" HREF="join.html"></HEAD ><BODY CLASS="REFENTRY" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#840084" ALINK="#0000FF" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >DSSSL Library Reference: Part of the Modular DocBook Stylesheet distribution</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="split.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="join.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><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 ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="split.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="join.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >split</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="r300.htm" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >join</TD ></TR ></TABLE ></DIV ></BODY ></HTML >