RE: Incrementing a variable in XSL

Ken Ross wrote:
> In short you can't.
>
> You can simulate it by using <xsl:value-of
> select="count(preceding::a)+1"/>.

Wouldn't something like this (admittedly ad hoc, untested code) work too?

    <xsl:template match="docroot">
        <xsl:variable name="var">1</xsl:variable>
        <xsl:apply-templates select="a[1]" mode="tailRecurseSibs"/>
    </xsl:template>

    <xsl:template match="a" mode="tailRecurseSibs">
        <xsl:param name="var" select="1"/>
        <xsl:value-of select="$var"/>
        <xsl:apply-templates select="following-sibling::a"
mode="tailRecurseSibs">
            <xsl:with-param name="var" select="$var + 1"/>
        </xsl:apply-templates>
    </xsl:template>

In other words, while direct iteration using a variable will not allow the
desired operation, tail recursion using a parameter should.  Right?

-- Roger Glover
   glover_roger@xxxxxxxxx


> -----Original Message-----
> From: Mukul [mailto:mukulw3@xxxxxxxxx]
> Sent: Thursday, 16 January 2003 3:37 PM
> To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> Subject:  Incrementing a variable in XSL
>
>
> Hello ,
> I have a simple XML file as below:
> <?xml version="1.0" encoding="UTF-8"?>
> <docroot>
>   <a>1</a>
>   <a>2</a>
>   <a>3</a>
>   <a>4</a>
> </docroot>
>
> I have written a XSL stylesheet as below:
> <?xml version="1.0" encoding="UTF-8"?>
> <xsl:stylesheet version="1.0"
> xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
>
> <xsl:template match="docroot">
>     <xsl:variable name="var">1</xsl:variable>
>     <xsl:for-each select="a">
>        <xsl:value-of select="$var"/>
>        <!-- incrementing $var ?? -->
>     </xsl:for-each>
> </xsl:template>
> </xsl:stylesheet>
>
> I want to increment a variable in <xsl:for-each ..,
> and print it with <xsl:value-of ..
>
> There is a situation where in the XML file, a tag
> repeats and I want to output the no's 1, 2, 3 etc in
> the output with each tag instance.
>
> How can I do this?
>
> Regards,
> Mukul


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