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Re: [xsl] Recursive function problem

2010-06-30 03:46:43
Wow that looks massively complicated for such a simple task!
Assuming its all necessary and just answering your initial quesion,
you have:

       <name>
           <xsl:copy-of select='@role'/>
           <xsl:value-of select='dtg:attributes-to-elements(.,
$name-attrs, $name-elems)'/>
       </name>

....and that value-of will always return a text node, so if your
function is returning elements you will get the text value of those
elements rather than the elements themselves.  If you change it to
xsl:copy-of instead of value-of you will get the elements.


cheers
andrew



On 30 June 2010 09:28, Nic Gibson <nicg(_at_)corbas(_dot_)net> wrote:
Good morning

I'm writing a function to be used as part of a content conversion from one
DTD to another. The input is in the following form:

<names>
   <nameGrp role="editor" foreNames="Donald B."
       mainName="Redford">Donald B. Redford</nameGrp>
   <nameGrp
       foreNames="Thutmose" foreTitle="III">Thutmose III</nameGrp>
</names>

and I need to get the output into the form:

<names>
   <name><fname>Donald B.</fname> <sname>Redford</sname></name>
   <name><fname>Thutmose</fname> <ntitle>III</ntitle></name>
</names>

I've clearly made an error in the function as the output I am getting is
on the lines of:

<names>
   <name>Donald B. Redford</name>
   <name>Thutmose III</name>
</names>

The relevant portions of the stylesheet are:

<xsl:stylesheet
   xmlns:dtg="http://dtg.oup.com/functions";
   xmlns:xsl="http://www.w3.org/1999/XSL/Transform"; 
xmlns:xd="http://www.oxygenxml.com/ns/doc/xsl";
   xmlns:xs="http://www.w3.org/2001/XMLSchema";
   version="2.0" exclude-result-prefixes="dtg xd xs">

   <xsl:variable name='name-attrs' select="('foreNames', 'mainName', 
'foreTitle')"/>
   <xsl:variable name='name-elems' select="('fname', 'sname', 'ntitle')"/>

   <xsl:template match="/">
       <names>
           <xsl:apply-templates select='names/nameGrp'/>
       </names>
   </xsl:template>

   <xsl:template match='nameGrp'>
       <name>
           <xsl:copy-of select='@role'/>
           <xsl:value-of select='dtg:attributes-to-elements(., $name-attrs, 
$name-elems)'/>
       </name>
   </xsl:template>


   <xsl:function name='dtg:attributes-to-elements'>

       <xsl:param name="element"/>
       <xsl:param name='attributes'/>
       <xsl:param name='elements'/>

       <!-- only the listed attributes, not all of them -->
       <xsl:variable name="attribs" select='$element/@*[local-name(.) = 
$attributes]'></xsl:variable>

       <!-- we want the attributes reverse sorted by the length of their 
values. -->
       <xsl:variable name='sorted-attribs' as='item()*'>
           <xsl:perform-sort select='$attribs' >
               <xsl:sort select='string-length(string(.))' 
order="descending"/>
           </xsl:perform-sort>
       </xsl:variable>

       <xsl:if test='count($attributes) != count($elements)'>
           <xsl:message terminate="yes">attributes-to-elements - attribute 
and element sequences must be the same size.</xsl:message>
       </xsl:if>

       <xsl:value-of select='dtg:attr-to-elem-impl(string($element), 
$sorted-attribs, $attributes, $elements)'/>

   </xsl:function>


   <xsl:function name="dtg:attr-to-elem-impl">

       <xsl:param name='source'/>
       <xsl:param name='input-attribs'/>
       <xsl:param name='attrib-names'/>
       <xsl:param name='element-names'/>

       <xsl:variable name='current-val' select='string($input-attribs[1])'/>
       <xsl:variable name='current-name' 
select='local-name($input-attribs[1])'/>
       <xsl:variable name='index' select='index-of($attrib-names, 
$current-name)'/>
       <xsl:variable name='output-element' select='$element-names[$index]'/>
       <xsl:variable name="next-attribs" select='$input-attribs[position() gt 
1]'/>

       <xsl:choose>

           <xsl:when test="$source = ''">
               <xsl:value-of select="$source"/>
           </xsl:when>

           <xsl:when test="count($input-attribs) = 0">
               <xsl:value-of select="$source"/>
           </xsl:when>

           <xsl:when test="contains($source, $current-val)">

               <xsl:variable name='new-element'>
                   <xsl:element name="{$output-element}"><xsl:value-of 
select="$current-val"/></xsl:element>
               </xsl:variable>

               <xsl:variable name='before' select="substring-before($source, 
$current-val)"/>
               <xsl:variable name='after' select="substring-after($source, 
$current-val)"/>

               <xsl:variable name='result-before'
                   select="dtg:attr-to-elem-impl($before, $next-attribs, 
$attrib-names, $element-names)"/>
               <xsl:variable name='result-after'
                   select="dtg:attr-to-elem-impl($after, $next-attribs, 
$attrib-names, $element-names)"/>

               <xsl:sequence select="($result-before, $new-element, 
$result-after)"/>

           </xsl:when>

           <xsl:otherwise>
               <xsl:sequence select="dtg:attr-to-elem-impl($source, 
$next-attribs, $attrib-names, $element-names)"/>
           </xsl:otherwise>

       </xsl:choose>

   </xsl:function>

</xsl:stylesheet>

The large number of variables is due to my having traced through this in the 
oXygen debugger.
I've seen (in the degugger) that $new-element does contain the element 
created but it
appears to be lost before the result is generated.

I'm pretty sure the error is in either the variable (new-element) that should 
be
creating the element or in the xsl:sequence instructions. However, I'm having 
a failing
to see the wood for the trees moment. Any pointers would be gratefully 
received.

By the way the recursion for result-before and result-after shoudl be safe as 
I know
that the content of each attribute can only occur once in the text.

cheers

nic


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-- 
Andrew Welch
http://andrewjwelch.com
Kernow: http://kernowforsaxon.sf.net/

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