RE: recursive addition

It sounds to me like what you want is this: 
Given dir1 you want to add 4 from the files attribute of folder[@id='dir1'] , plus 3 from the files attribute from folder[@id='dir2'], plus the 6 from the files attribute of folder[@id='dir3'] for a total of 13.

I believe the following xslt should fit your needs. It could probably be simplified, but I was just banging it out...

I've learned to love <xsl:message> while writing this, excellent for dumping out what's going on...

Josh

<?xml version="1.0"?>

<xsl:stylesheet 
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
  version="1.0">
<xsl:output method="xml" indent="yes" xmlns:xalan="http://xml.apache.org/xslt"
  xalan:indent-amount="2"/>

<xsl:template match="/root">
  <!-- the id of the folder to count -->
  <xsl:variable name="dir-id" select="'dir1'"/>

  <xsl:variable name="count">
    <xsl:call-template name="count-files">
      <xsl:with-param name="dir" select="/root/folder[@id=$dir-id]"/>
    </xsl:call-template>
  </xsl:variable>

  There are <xsl:value-of select="$count"/> files under <xsl:value-of select="$dir"/>.

</xsl:template>

<xsl:template name="count-files">
  <xsl:param name="dir"/>

  <!-- count the files in this dir -->
  <xsl:variable name="counter">
    <xsl:choose>
      <xsl:when test="$dir/file[@id]">
        <xsl:call-template name="count-subfiles">
          <xsl:with-param name="file" select="$dir/file[@id][1]"/>
        </xsl:call-template>
      </xsl:when>
      <xsl:otherwise>0</xsl:otherwise>
    </xsl:choose>
  </xsl:variable>

  <xsl:value-of select="$dir/@files + $counter"/>

</xsl:template>

<xsl:template name="count-subfiles">
  <xsl:param name="file"/>

  <!-- count the files in the related dir -->
  <xsl:variable name="x">
    <xsl:call-template name="count-files">
      <xsl:with-param name="dir" select="/root/folder[@id=$file/@id]"/>
    </xsl:call-template>
  </xsl:variable>

  <!-- count the files in the following-sibling files with dir ids-->
  <xsl:variable name="y">
    <xsl:choose>
      <xsl:when test="$file/following-sibling::file[@id]">
        <xsl:call-template name="count-subfiles">
          <xsl:with-param name="file" select="$file/following-sibling::file[@id][1]"/>
        </xsl:call-template>
      </xsl:when>
      <xsl:otherwise>0</xsl:otherwise>
    </xsl:choose>
  </xsl:variable>

  <xsl:value-of select="$x + $y"/>

</xsl:template>

</xsl:stylesheet>

-----Original Message-----
From: annirack@xxxxxxx [mailto:annirack@xxxxxxx]
Sent: Wednesday, January 14, 2004 2:42 PM
To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
Subject: Re:  recursive addition


> One question -- what does the attribute @files mean on
> the folder element whose @id="dir1"? It has @files="4",
> but that doesn't seem to enter into the calculation you're
> doing. So the semantics of the XML are a little unclear to me.

Sorry, I guess the example was a little unclear.  I want to sum the files attribute for *all* folders under the initial parent.  So the result I'd want from dir0 would be 25.  The sum of the file attributes of all the folder elements is 27. 

Is that a little clearer?

> To rephrase the above question, are you just summing the attributes
> of leaf folders (as you appear to be in your example where you
> expect the answer to be 9)?

All branches and leaves, but not the trunk. (where an arbitrary starting point is the trunk)

> > Here's an example:
> > <root>
> >    <folder files="2" id="dir0">
> >       <file id="dir1" />
> > 
> >       <file id="dir4" />
> >    </folder>
> > 
> >    <folder files="4" id="dir1">
> >       <file id="dir2" />
> > 
> >       <file id="dir3" />
> >    </folder>
> > 
> >    <folder files="3" id="dir2" />
> > 
> >    <folder files="6" id="dir3" />
> > 
> >    <folder files="7" id="dir4" />
> > 
> >    <folder files="5" id="dir5" />
> > </root>
> > 


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 XSL-List info and archive:  http://www.mulberrytech.com/xsl/xsl-list