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RE: [xsl] tail recursion and NaN

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Hi Susan,

If the operation is a simple sum, why not use the inherent XSLT function sum and let the XPath pick out the right nodes for you?

BTW a number(.) also returns 'NaN' if the node's string value is nothing (""), so some of the tests you do are not necessary anyway (MK's XSLT Programmers Ref. 2nd. ed., p. 532).

I would expect something like this to work:
result = <xsl:value-of select="sum(nodeset-containing-prices[number(translate(.,'$',''))!='NaN'])"/>

where nodeset-containing-prices should be exchanged with the nodeset you use in the $price parameter first time the template total_value is called.

I hope this helps

Regards,
Ragulf Pickaxe :)

From: "Susan Campbell" <SCampbell@xxxxxxxxxxxxxx>
Reply-To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
To: <xsl-list@xxxxxxxxxxxxxxxxxxxxxx>
Subject: RE: [xsl] tail recursion and NaN
Date: Fri, 7 May 2004 08:59:19 -0400

Thanks for the help. I later learned I also had to test for a dollar sign as well as empty cells. This is what I'm using. It works, but there may be a more compact/elegant way to do it.
sc

<xsl:template name="total-value">
   <xsl:param name="price"/>
 	 <xsl:param name="result" select="0"/>
 	 <xsl:param name="nodollarsign" select="translate($price,'$','')"/>
	   <xsl:choose>
		<xsl:when test="$price and number($price) = number($price)">
			 <xsl:call-template name="total-value">
  			<xsl:with-param name="price" select="$price[position() &gt; 1]"/>
  			<xsl:with-param name="result" select="$result + $price"/>
  			</xsl:call-template>
  		</xsl:when>
		<xsl:when test="$nodollarsign">
			<xsl:call-template name="total-value">
  			<xsl:with-param name="price" select="$price[position() &gt; 1]"/>
  			<xsl:with-param name="result" select="$result + $nodollarsign"/>
  		            </xsl:call-template>
  	           </xsl:when>
  		<xsl:when test="$price and number($price) != number($price)">
			<xsl:call-template name="total-value">
  			<xsl:with-param name="price" select="$price[position() &gt; 1]"/>
  			<xsl:with-param name="result" select="$result"/>
  			</xsl:call-template>
  		</xsl:when>
		<xsl:otherwise><xsl:value-of select="$result"/></xsl:otherwise>
	 </xsl:choose>
</xsl:template>

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