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Re: Merging nested/adjacent nodes

2005-05-19 17:22:52
Most excellent..  Thank you both for your help.  I tried a hundred
different variations of something similar but you somehow hit the nail
on the head.... even though I left an important piece out.  What I
failed to mention is that, in that example, I wanted to *only* merge
the <supervisor> nodes.  So your output is exactly what I was looking
for, but I didnt' include an important component in my examples
(multiple <employee> nodes with the same name, not to be merged). 
Fortunately, your code did the bulk of the work and it only took me a
minute to modify it to the following (I may find some holes in it
later, but it seems to be working for now)...

<xsl:template name="m" match="*|/">
<xsl:param name="c" select="*"/>
<xsl:for-each-group select="$c" group-adjacent="self::supervisor/@name
| self::employee">
<xsl:choose>
<xsl:when test="current-group[1]/self::superviser">
<xsl:copy>
<xsl:copy-of select="@*"/>
<xsl:call-template name="m">
<xsl:with-param name="c" select="current-group()/*"/>
</xsl:call-template>
</xsl:copy>
</xsl:when>
<xsl:otherwise>
<xsl:copy-of select="current-group()"/>
</xsl:otherwise>
</xsl:choose>
</xsl:for-each-group>
</xsl:template>

On 5/19/05, David Carlisle <davidc(_at_)nag(_dot_)co(_dot_)uk> wrote:

Turns out that this is simpler than it looks, simpler than I thought it
was going to be anyway. Powerful voodoo this for-each-group stuff....


emp.xsl:

<xsl:stylesheet
  version="2.0"
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform";


<xsl:output indent="yes"/>
<xsl:strip-space elements="*"/>


<xsl:template name="m" match="*|/">
<xsl:param name="c" select="*"/>
<xsl:for-each-group select="$c" group-adjacent="string(@name)">
<xsl:copy>
<xsl:copy-of select="@*"/>
<xsl:call-template name="m">
 <xsl:with-param name="c" select="current-group()/*"/>
</xsl:call-template>
</xsl:copy>
</xsl:for-each-group>
</xsl:template>

</xsl:stylesheet>


emp.xml

<employees>
       <supervisor name="jimmy">
               <supervisor name="bob">
                       <employee name="grunt_1"/>
               </supervisor>
       </supervisor>
       <supervisor name="jimmy">
               <supervisor name="bob">
                       <employee name="grunt_2"/>
               </supervisor>
       </supervisor>
       <supervisor name="jimmy">
               <employee name="grunt_3"/>
       </supervisor>
       <employee name="grunt_4"/>
       <supervisor name="jimmy">
               <supervisor name="bob">
                       <employee name="grunt_5"/>
               </supervisor>
       </supervisor>
</employees>



$ saxon8 emp.xml emp.xsl
<?xml version="1.0" encoding="UTF-8"?>
<employees>
  <supervisor name="jimmy">
     <supervisor name="bob">
        <employee name="grunt_1"/>
        <employee name="grunt_2"/>
     </supervisor>
     <employee name="grunt_3"/>
  </supervisor>
  <employee name="grunt_4"/>
  <supervisor name="jimmy">
     <supervisor name="bob">
        <employee name="grunt_5"/>
     </supervisor>
  </supervisor>
</employees>


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