URL encode/decode

gistfile1.xml

<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet version="1.0"
	xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
  
<!--
	ISO-8859-1 based URL-encoding demo
	Written by Mike J. Brown, mike@skew.org.
	Updated 2002-05-20.

	No license; use freely, but credit me if reproducing in print.

	Also see http://skew.org/xml/misc/URI-i18n/ for a discussion of
	non-ASCII characters in URIs.

	Usage:

	<xsl:call-template name="decode">
		<xsl:with-param name="str" select="$url"/>
	</xsl:call-template>

	<xsl:call-template name="encode">
		<xsl:with-param name="str" select="$url"/>
	</xsl:call-template>

-->

	<xsl:variable name="hex" select="'0123456789ABCDEF'"/>
	<xsl:variable name="ascii"> !"#$%&amp;'()*+,-./0123456789:;&lt;=&gt;?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~</xsl:variable>
	<xsl:variable name="safe">!'()*-.0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz~</xsl:variable>
	<xsl:variable name="latin1">&#160;&#161;&#162;&#163;&#164;&#165;&#166;&#167;&#168;&#169;&#170;&#171;&#172;&#173;&#174;&#175;&#176;&#177;&#178;&#179;&#180;&#181;&#182;&#183;&#184;&#185;&#186;&#187;&#188;&#189;&#190;&#191;&#192;&#193;&#194;&#195;&#196;&#197;&#198;&#199;&#200;&#201;&#202;&#203;&#204;&#205;&#206;&#207;&#208;&#209;&#210;&#211;&#212;&#213;&#214;&#215;&#216;&#217;&#218;&#219;&#220;&#221;&#222;&#223;&#224;&#225;&#226;&#227;&#228;&#229;&#230;&#231;&#232;&#233;&#234;&#235;&#236;&#237;&#238;&#239;&#240;&#241;&#242;&#243;&#244;&#245;&#246;&#247;&#248;&#249;&#250;&#251;&#252;&#253;&#254;&#255;</xsl:variable>

	<xsl:template name="decode">
		<xsl:param name="str"/>

		<xsl:choose>
			<xsl:when test="contains($str,'%')">
				<xsl:value-of select="substring-before($str,'%')"/>
				<xsl:variable name="hexpair" select="translate(substring(substring-after($str,'%'),1,2),'abcdef','ABCDEF')"/>
				<xsl:variable name="decimal" select="(string-length(substring-before($hex,substring($hexpair,1,1))))*16 + string-length(substring-before($hex,substring($hexpair,2,1)))"/>
				<xsl:choose>
					<xsl:when test="$decimal &lt; 127 and $decimal &gt; 31">
						<xsl:value-of select="substring($ascii,$decimal - 31,1)"/>
					</xsl:when>
					<xsl:when test="$decimal &gt; 159">
						<xsl:value-of select="substring($latin1,$decimal - 159,1)"/>
					</xsl:when>
					<xsl:otherwise>?</xsl:otherwise>
				</xsl:choose>
				<xsl:call-template name="decode">
					<xsl:with-param name="str" select="substring(substring-after($str,'%'),3)"/>
				</xsl:call-template>
			</xsl:when>
			<xsl:otherwise>
				<xsl:value-of select="$str"/>
			</xsl:otherwise>
		</xsl:choose>
	</xsl:template>


	<xsl:template name="url-encode">
		<xsl:param name="str"/>   
		<xsl:if test="$str">
			<xsl:variable name="first-char" select="substring($str,1,1)"/>
			<xsl:choose>
				<xsl:when test="contains($safe,$first-char)">
					<xsl:value-of select="$first-char"/>
				</xsl:when>
				<xsl:otherwise>
					<xsl:variable name="codepoint">
						<xsl:choose>
							<xsl:when test="contains($ascii,$first-char)">
								<xsl:value-of select="string-length(substring-before($ascii,$first-char)) + 32"/>
							</xsl:when>
							<xsl:when test="contains($latin1,$first-char)">
								<xsl:value-of select="string-length(substring-before($latin1,$first-char)) + 160"/>
							</xsl:when>
							<xsl:otherwise>
								<xsl:message terminate="no">Warning: string contains a character that is out of range! Substituting "?".</xsl:message>
								<xsl:text>63</xsl:text>
							</xsl:otherwise>
						</xsl:choose>
					</xsl:variable>
					<xsl:variable name="hex-digit1" select="substring($hex,floor($codepoint div 16) + 1,1)"/>
					<xsl:variable name="hex-digit2" select="substring($hex,$codepoint mod 16 + 1,1)"/>
					<xsl:value-of select="concat('%',$hex-digit1,$hex-digit2)"/>
				</xsl:otherwise>
			</xsl:choose>
			<xsl:if test="string-length($str) &gt; 1">
				<xsl:call-template name="url-encode">
					<xsl:with-param name="str" select="substring($str,2)"/>
				</xsl:call-template>
			</xsl:if>
		</xsl:if>
	</xsl:template>

</xsl:stylesheet>

how to use????

This is awesome. Thanks for making a gist of this. Using it to decode some cookie values in SharePoint Designer 2010.

can someone explain how to use this please. how I can call the Encode function in another xsl?

Hello, can you modify the template name? according to your help in comment you should call this template "encode", but actually its name is "url-encode". Or at least modify your help in comment? :)