Re: [xsl] round-robin template call

["G. Ken Holman" <gkholman@xxxxxxxxxxxxxxxxxxxx>]

At 2009-04-05 18:47 +0200, Aragon Gouveia wrote:
> I'm having difficulty figuring out how to perform something in XSLT 
> 1.0.  I want to be able to call a template at random points in an 
> XSLT document, and each time the template is called it outputs a 
> different version of a node.

Then pass a parameter value and trigger on the passed value.

>  Example:
>
> <xsl:stylesheet>
> <xsl:template match="/">
>         <output>
>                 <xsl:call-template name="makenode"/>
>                 <tagX>data</tagX>
>                 <tagY>data</tagY>
>                 <xsl:call-template name="makenode"/>
>         </output>
> </xsl:template>
> <xsl:template name="makenode">
>         <xsl:choose>
>                 <xsl:when test="oddcalls()">
>                         <tagA type="odd">data</tagA>
>                 </xsl:when>
>                 <xsl:when test="evencalls()">
>                         <tagA type="even">data</tagA>
>                 </xsl:when>
>         </xsl:choose>
> </xsl:template>
> </xsl:stylesheet>

You seem to be showing a binary testing requirement, so I've written 
it as such:

<xsl:stylesheet>
<xsl:template match="/">
        <output>
                <xsl:call-template name="makenode">
                 <xsl:with-param name="param-name" select="true()"/>
               </xsl:call-template>
                <tagX>data</tagX>
                <tagY>data</tagY>
                <xsl:call-template name="makenode">
                 <xsl:with-param name="param-name" select="false()"/>
               </xsl:call-template>
        </output>
</xsl:template>
<xsl:template name="makenode">
  <xsl:param name="param-name"/>
        <xsl:choose>
                <xsl:when test="$param-name">
                        <tagA type="odd">data</tagA>
                </xsl:when>
                <xsl:otherwise>
                        <tagA type="even">data</tagA>
                </xsl:otherwise>
        </xsl:choose>
</xsl:template>
</xsl:stylesheet>

> Obviously variables and parameters can't be altered once declared, 
> and I can't think of a way of doing this with a recursive template.

Where does recursion come into your requirement?

I hope this helps.

. . . . . . . Ken

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