Re: text retrieval problem

| | How do I get the last number in a string like:
| | "[sdsdf] 234 sdf 50"

If you are a Saxon 5.4 user, you can also play with a 
neat extension that Mike Kay has added recently for
defining extension functions using XSLT itself
as the language for the function's implementation.
I downloaded Saxon 5.4 recently and was playing with this 
(of course proprietary, yet very interesting) addition.

Here's an example of the stylesheet from my last
posting that uses the standard <xsl:call-template>
approach for non-Saxon processors and instead uses
an XSLT-based extension function if running 
Saxon 5.4 To see the difference, I made the 
function return the last number in the string *plus one*. 

I'm assuming there's not a performance difference
between the two, but the difference is the syntax
of invoking the functionality:

   <xsl:value-of select="util:last-num-plus-one(.)"/>

versus the standard:

    <xsl:call-template name="last-number">
     <xsl:with-param name="str" select="."/>
   </xsl:call-template>

Assuming your input document is again:
 
 <List>
    <Part>[sdsdf] 234 sdf 50</Part>
    <Part>1123</Part>
    <Part>ABC 123</Part>
</List>

Running the transformation with a non-Saxon XSLT engine
produces:

<result>
   <LastNum>50</LastNum>
   <LastNum>1123</LastNum>
   <LastNum>123</LastNum>
</result>

And with Saxon (remember the function's intentionally
adding one to the result!)...

<result>
   <LastNum>51</LastNum>
   <LastNum>1124</LastNum>
   <LastNum>124</LastNum>
</result>

The stylesheet looks like:

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
                xmlns:saxon="http://icl.com/saxon"
                xmlns:util="urn:something"
                extension-element-prefixes="saxon"
                exclude-result-prefixes="saxon util">
  <xsl:output indent="yes"/>
  <xsl:template match="/List">
   <result>
     <xsl:for-each select="Part">
       <LastNum>
         <xsl:choose>
           <!-- If extension function is available, use it -->
           <xsl:when test="function-available('util:last-num-plus-one')">
             <xsl:value-of select="util:last-num-plus-one(.)"/>
           </xsl:when>
           <!-- Otherwise, go the call-template route -->
           <xsl:otherwise>
             <xsl:call-template name="last-number">
               <xsl:with-param name="str" select="."/>
             </xsl:call-template>
           </xsl:otherwise>
         </xsl:choose>
       </LastNum>
     </xsl:for-each>
   </result>
  </xsl:template>

  <!-- Example using recursive named template -->
  <xsl:template name="last-number">
    <xsl:param name="str"/>
    <xsl:variable name="left" select="substring-after($str,' ')"/>
    <xsl:choose>
      <xsl:when test="$left=''">
        <xsl:value-of select="number($str)"/>
      </xsl:when>
      <xsl:otherwise>
        <xsl:call-template name="last-number">
          <xsl:with-param name="str" select="$left"/>
        </xsl:call-template>
      </xsl:otherwise>
    </xsl:choose>
  </xsl:template>

  <!-- 
   | Example using recursive saxon XSLT extension function 
   | Requires Saxon 5.4 or greater. 
   +-->
  <saxon:function name="util:last-num-plus-one">
    <xsl:param name="str"/>
    <xsl:variable name="left" select="substring-after($str,' ')"/>
    <xsl:choose>
      <xsl:when test="$left=''">
        <saxon:return select="number($str)+1"/>
      </xsl:when>
      <xsl:otherwise>
        <saxon:return select="util:last-num-plus-one($left)"/>
      </xsl:otherwise>
    </xsl:choose>
  </saxon:function>

</xsl:stylesheet>

Have fun.
______________________________________________________________
Steve Muench, Lead XML Evangelist & Consulting Product Manager
BC4J & XSQL Servlet Development Teams, Oracle Rep to XSL WG
Author "Building Oracle XML Applications", O'Reilly
http://www.oreilly.com/catalog/orxmlapp/





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