Re: [xsl] lastIndexOf('char') and XSLT string functions

[Jeni Tennison <mail@xxxxxxxxxxxxxxxx>]

Hi Troadec,

> i'm looking for a xslt method to identify the last iteration of a
> char into a string. For example, to extract automatically the name
> of the html page into the url.
>
> string : "h ttp://www.thesite.com/directory1/dir2/dir3../pageindex.htm"
>
> there are the functions substrings-before() et substring-after(),
> but they work on the first occurence of the marker-string. Is there
> a Xslt function which gives the last occurence of a marker-string
> (like lastIndexOf('/',"string")) into a string?

No, there isn't.

You can achieve what you want through recursion.  Walk through the
string, taking bits off the front of it until you get to a string
which has no '/' in it whatsoever.

<!-- define a lastIndexOf named template -->
<xsl:template name="lastIndexOf">
   <!-- declare that it takes two parameters - the string and the char -->
   <xsl:param name="string" />
   <xsl:param name="char" />
   <xsl:choose>
      <!-- if the string contains the character... -->
      <xsl:when test="contains($string, $char)">
         <!-- call the template recursively... -->
         <xsl:call-template name="lastIndexOf">
            <!-- with the string being the string after the character
                 -->
            <xsl:with-param name="string"
                            select="substring-after($string, $char)" />
            <!-- and the character being the same as before -->
            <xsl:with-param name="char" select="$char" />
         </xsl:call-template>
      </xsl:when>
      <!-- otherwise, return the value of the string -->
      <xsl:otherwise><xsl:value-of select="$string" /></xsl:otherwise>
   </xsl:choose>
</xsl:template>

To get the filename of a URL held in the URL child of the current
node, you can call this template like:

  <xsl:call-template name="lastIndexOf">
     <xsl:with-param name="string" select="URL" />
     <xsl:with-param name="char" select="/" />
  </xsl:call-template>

It's pretty verbose, but I'm afraid that's the only way to do it in
XSLT at the moment.

I hope that helps,

Jeni

---
Jeni Tennison
http://www.jenitennison.com/



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