Xslt for splitting a url in parts and combing them again - url

Question

I want to build a sort of breadcrumb. I have link for example
http://server/site1/site2/site3
and want to build something like
http://serverhttp://server/site1...
How can I do this with xslt?

Answer 1

This can be accomplished with a recursive template:
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="xml" indent="yes"/>
<xsl:variable name="urlSample" select="'http://server/site1/site2/site3'" />
<xsl:template match="/">
<xsl:call-template name="UrlLinks">
<xsl:with-param name="url" select="$urlSample" />
</xsl:call-template>
</xsl:template>
<xsl:template name="UrlLinks">
<xsl:param name="url" />
<xsl:call-template name="UrlLinksIter">
<xsl:with-param name="portionSoFar" select="concat(substring-before($url, '://'), '://')" />
<xsl:with-param name="remainder" select="concat(substring-after($url, '://'), '/')" />
</xsl:call-template>
</xsl:template>
<xsl:template name="UrlLinksIter">
<xsl:param name="portionSoFar" />
<xsl:param name="remainder" />
<xsl:variable name="nextPart" select="substring-before($remainder, '/')" />
<xsl:variable name="nextRemainder" select="substring-after($remainder, '/')" />
<xsl:if test="normalize-space($nextRemainder) or normalize-space($nextPart)">
<xsl:variable name="url" select="concat($portionSoFar, $nextPart)"/>
<xsl:if test="normalize-space($nextPart)">
<!-- $nextPart could be empty if there are multiple slashes in a row-->
<a href="{$url}">
<xsl:value-of select="$url"/>
</a>
</xsl:if>
<xsl:call-template name="UrlLinksIter">
<xsl:with-param name="portionSoFar" select="concat($url, '/')" />
<xsl:with-param name="remainder" select="$nextRemainder" />
</xsl:call-template>
</xsl:if>
</xsl:template>
</xsl:stylesheet>
When this is run on any input (since the sample value is in a variable here) this produces:
http://server
http://server/site1
http://server/site1/site2
http://server/site1/site2/site3