Showing Primes in XSL

primes.xsl
Copy and paste the code from the text area below to primes.xsl

<?xml version="1.0"?>

<xsl:stylesheet version="1.0"

xmlns:xsl="http://www.w3.org/1999/XSL/Transform">

<!-- Jim Lawless

jimbo@radiks.net

http://www.radiks.net/~jimbo

Show primes all from 2 to 1000

-->

<xsl:template match="/">

<xsl:call-template name="loop">

<xsl:with-param name="val" select="2" />

</xsl:call-template>

</xsl:template>

<xsl:template name="loop">

<xsl:param name="val" select="''" />

<xsl:if test="$val < 1000">

<xsl:call-template name="findPrime">

<xsl:with-param name="start" select="2" />

<xsl:with-param name="end" select="$val" />

</xsl:call-template>

<xsl:call-template name="loop">

<xsl:with-param name="val" select="$val+1" />

</xsl:call-template>

</xsl:if>

</xsl:template>

<xsl:template name="findPrime">

<xsl:param name="start" select="''" />

<xsl:param name="end" select="''" />

<xsl:if test="($start * $start) > $end">

<xsl:value-of select="concat($end,' is prime    ')" />

</xsl:if>

<xsl:if test="($start * $start) <= $end">

<xsl:if test="($end mod $start)!=0">

<xsl:call-template name="findPrime">

<xsl:with-param name="start" select="$start + 1" />

<xsl:with-param name="end" select="$end" />

</xsl:call-template >

</xsl:if>

</xsl:template>

</xsl:stylesheet>

The code above demonstrates the ability to simulate iteration in an XSLT transform using recursion.

The templates "loop" and "findPrime" each call themselves recursivley to simulate iterative loops.