Re: [xsl] XSLT code for function fn:fold-right()

["Martin Honnen martin.honnen@xxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>]

Am 13.03.2019 um 10:11 schrieb Mukul Gandhi gandhi.mukul@xxxxxxxxx:
> Hi all,
> B  B  Please look at following link, for description of XPath 3.1 
> functionB fn:fold-right(),
>
> https://www.w3.org/TR/xpath-functions-31/#func-fold-right
>
> Within this function's description, its mentioned
> The effect of the function is equivalent to the following implementation
> or its equivalent in XSLT:
>
> <xsl:function name="fn:fold-right" as="item()*">
> B  <xsl:param name="seq" as="item()*"/>
> B  <xsl:param name="zero" as="item()*"/>
> B  <xsl:param name="f" as="function(item(), item()*) as item()*"/>
> B  <xsl:choose>
> B  B  <xsl:when test="fn:empty($seq)">
> B  B  B  <xsl:sequence select="$zero"/>
> B  B  </xsl:when>
> B  B  <xsl:otherwise>
> B  B  B  <xsl:sequence select="$f(fn:head($seq), 
> fn:fold-right(fn:tail($seq), $zero, $f))"/>
> B  B  </xsl:otherwise>
> B  </xsl:choose>
> </xsl:function>
>
> I've a feeling, that above XSLT logic of this function may be wrong 
> (particularly the line <xsl:sequence select="$f(fn:head($seq), 
> fn:fold-right(fn:tail($seq), $zero, $f))"/>. But I'll appreciate if 
> anyone may point me wrong).

Is there any input for which the function fails to give the right result?

For instance for any of the test cases in 
https://github.com/w3c/qt3tests/blob/master/fn/fold-right.xml?