Re: [xsl] collapsing number ranges

[Bruce D'Arcus <bdarcus@xxxxxxxxxxxxx>]

On Aug 31, 2004, at 5:11 AM, David Carlisle wrote:

> > I was just reminded that page numbers aren't always integers.  
> > Example:
> >   pp. iii-vi.
> >
> > I guess that settles it then; better to use substrings in this case.
>
> On the contrary, to handle those you are going to first have to convert
> to numbers otherwise you are just "substring" isn't really going to be
> the right relation for roman numerals. Having converted to numbers you
> could use either approach to truncate the upper range limit before
> converting back to roman numerals. (You'll probbaly need a different
> truncation algorithm, in this case, if you want to trucate at all).

Yeah, I don't think there's any need to modify roman numerals, so for 
the time being I just did this:

<xsl:function name="bib:number-condense">
  <xsl:param name="begin" />
  <xsl:param name="end" />
  <xsl:choose>
    <xsl:when test="$begin castable as xs:integer">
      <xsl:variable name="begin" select="$begin" as="xs:integer" />
      <xsl:choose>
	<xsl:when test="$begin castable as xs:integer and
		  $begin gt 100 and
		  $begin mod 100 and
		  $begin idiv 100 eq $end idiv 100">
	  <xsl:value-of select="$end mod 100" />
	</xsl:when>
	<xsl:otherwise>
	  <xsl:value-of select="$end" />
	</xsl:otherwise>
      </xsl:choose>
    </xsl:when>
    <xsl:otherwise>
      <xsl:value-of select="$end" />
    </xsl:otherwise>
  </xsl:choose>
</xsl:function>