Re: [xsl] Re: Seeking an elegant XSLT function to check that a pair of numeric ranges are consecutive

["Dimitre Novatchev dnovatchev@xxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>]

On Sun, May 26, 2024 at 7:15b/AM Roger L Costello costello@xxxxxxxxx <
xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote:

> Another mind-blowing solution. This one from Michael Kay:
>
> <!--
>     Determine if the ranges in $seq are consecutive.
>     $seq = (0-2, 3-7, 8, 9-15) returns true
>     $seq = (0-3, 3-7, 8, 9-15) returns false
> -->
> <xsl:function name="f:isConsecutive" as="xs:boolean">
>     <xsl:param name="seq"/>
>
>     <xsl:variable name="seq-with-to" as="xs:integer*">
>         <xsl:evaluate xpath="$seq ! replace(., '-', ' to ') =>
> string-join(',')"/>
>     </xsl:variable>
>     <xsl:sequence select="deep-equal($seq-with-to, $seq-with-to[1] to
> $seq-with-to[last()])"/>
> </xsl:function>
>

Not very efficient, though.

Try it with: (1-10000000, 10000001-20000000, 20000001-30000000, 30000001)

Then run the pure XPath solution (provided earlier in this thread) - it
takes 0.0s (as per Oxygen) to execute.

The above XSLT transformation takes 5.2s (as per Oxygen) to produce the
same result.

Anyone, please try these for yourself.

Thanks,
Dimitre