Re: [docbook-apps] help with xslt

[Dave Pawson <davep@dpawson.co.uk>]

Sam Steingold wrote:
> Hi,
> I maintain clisp (http://clisp.cons.org), in particular, the clisp 
> manual ("implementation notes") in DocBook/xml format.
> the manual has a lot of links to the CLHS (Common Lisp HyperSpec, the 
> HTML version of the ANSI standard).
> I keep them in the form
> <ulink role="clhs" url="sec_11-1-2-1-2"/>
> which is converted by
> 
> <xsl:param name="clhs.top" select="'http://www.lisp.org/HyperSpec/'"/>
> <xsl:param name="clhs.body" select="concat($clhs.top, 'Body/')"/>
> <xsl:template match="ulink[@role='clhs']">
>  <xsl:choose><xsl:when test=".=''">
>    <a class="{@role}" href="{$clhs.body}{@url}.html"><xsl:text>[</xsl:text>
>     <xsl:value-of select="@url"/>
>     <xsl:text>]</xsl:text></a></xsl:when>
>   <xsl:otherwise>
>    <a class="{@role}" 
> href="{$clhs.body}{@url}.html"><xsl:apply-templates/></a>
> </xsl:otherwise></xsl:choose></xsl:template>
> 
> alas, there are two versions of CLHS around, the older one (for which 
> the above is geared) and the newer one, with a different page naming 
> system.
> 
> specifically, section 11.1.2.1.2 which is sec_11-1-2-1-2.html is the 
> older version is now 11_abab.html while chap-11.html is now 11_.html.
> 
> I want to be able to generate clisp impnotes which link to either 
> version based on a variable setting at processing time.
> 
> This would mean that I would have to write an xslt function mapping an 
> array of integers #(11 1 2 1 2) to either sec_11-1-2-1-2 or 11_abab.
> How do I do that?
> To begin with, I don't even know how to iterate (or recurse) in xslt.
> I use xsltproc on linux.


<xsl:variable name='ver' select="'1.0'"/>


<xsl:template match="ulink[@role='clhs']">

<xsl:variable name='target'>
<xsl:choose>
<xsl:when test="$ver = '1.0'>
   <xsl:value-of select="$ver1URL">
<xsl:otherwise>
  <xsl:value-of select="$ver2URL">
</xsl:otherwise>
</xsl:choose>
</xsl:variable>


   <xsl:choose><xsl:when test=".=''">
     <a class="{@role}" href="{$target}{@url}.html"><xsl:text>[</xsl:text>
      <xsl:value-of select="@url"/>
      <xsl:text>]</xsl:text></a></xsl:when>
    <xsl:otherwise>
     <a class="{@role}" href="{$target}{@url}.html">
      <xsl:apply-templates/></a>
  </xsl:otherwise></xsl:choose></xsl:template>


Which assumes $ver1URL points to version 1 of CLHS
and $ver2URL points to version 2 of CLHS

HTH


regards

-- 
Dave Pawson
XSLT XSL-FO FAQ.
http://www.dpawson.co.uk