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<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">
<xsl:output encoding="utf-8"/>
<xsl:template match="towerheight">
<towersequence>
<xsl:call-template name="print">
<xsl:with-param name="height1" select="."/>
<xsl:with-param name="height2" select="0"/>
<xsl:with-param name="height3" select="0"/>
</xsl:call-template>
<xsl:call-template name="transferstack">
<xsl:with-param name="source" select="1"/>
<xsl:with-param name="target" select="2"/>
<xsl:with-param name="spare" select="3"/>
<xsl:with-param name="height1" select="."/>
<xsl:with-param name="height2" select="0"/>
<xsl:with-param name="height3" select="0"/>
<xsl:with-param name="howmany" select="."/>
</xsl:call-template>
</towersequence>
</xsl:template>
<xsl:template name="transferstack">
<xsl:param name="source"/>
<xsl:param name="target"/>
<xsl:param name="spare"/>
<xsl:param name="height1"/>
<xsl:param name="height2"/>
<xsl:param name="height3"/>
<xsl:param name="howmany"/>
<xsl:if test="$howmany > 0">
<xsl:call-template name="transferstack">
<xsl:with-param name="source" select="$source"/>
<xsl:with-param name="target" select="$spare"/>
<xsl:with-param name="spare" select="$target"/>
<xsl:with-param name="height1" select="$height1"/>
<xsl:with-param name="height2" select="$height2"/>
<xsl:with-param name="height3" select="$height3"/>
<xsl:with-param name="howmany" select="$howmany - 1"/>
</xsl:call-template>
<xsl:call-template name="print">
<xsl:with-param name="height1"
select="($source = 1) * ($height1 - $howmany) + ($target = 1) * ($height1 + 1) + ($spare = 1) * ($height1 + $howmany - 1)"/>
<xsl:with-param name="height2"
select="($source = 2) * ($height2 - $howmany) + ($target = 2) * ($height2 + 1) + ($spare = 2) * ($height2 + $howmany - 1)"/>
<xsl:with-param name="height3"
select="($source = 3) * ($height3 - $howmany) + ($target = 3) * ($height3 + 1) + ($spare = 3) * ($height3 + $howmany - 1)"/>
</xsl:call-template>
<xsl:call-template name="transferstack">
<xsl:with-param name="source" select="$spare"/>
<xsl:with-param name="target" select="$target"/>
<xsl:with-param name="spare" select="$source"/>
<xsl:with-param name="height1"
select="($source = 1) * ($height1 - $howmany) + ($target = 1) * ($height1 + 1) + ($spare = 1) * ($height1 + $howmany - 1)"/>
<xsl:with-param name="height2"
select="($source = 2) * ($height2 - $howmany) + ($target = 2) * ($height2 + 1) + ($spare = 2) * ($height2 + $howmany - 1)"/>
<xsl:with-param name="height3"
select="($source = 3) * ($height3 - $howmany) + ($target = 3) * ($height3 + 1) + ($spare = 3) * ($height3 + $howmany - 1)"/>
<xsl:with-param name="howmany" select="$howmany - 1"/>
</xsl:call-template>
</xsl:if>
</xsl:template>
<xsl:template name="print">
<xsl:param name="height1"/>
<xsl:param name="height2"/>
<xsl:param name="height3"/>
<tower>
<pole height="{$height1}"/>
<pole height="{$height2}"/>
<pole height="{$height3}"/>
</tower>
</xsl:template>
</xsl:stylesheet>
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