Re: XSLT 3.0 saxon9.9 assertion error on function parameter

This has been raised as issue 4636, and fixed:

https://saxonica.plan.io/issues/4636

(I don't know why it took 5 hours for the email to be sent out: blame SourceForge)

Michael Kay
Saxonica

> On 8 Jul 2020, at 09:06, Matthieu RICAUD-DUSSARGET <m.ricaud-dussarget-y4x8KMh3xbas7OF8YUzxC26XGmf1S8Or@public.gmane.org> wrote:
> 
> Hi all,
>  
> When updating my Oxygen IDE from version 20.1 (using Saxon EE 9.8.0.12) to version 22.1 (using Saxon EE 9.9.1.7) I get an new  “java.lang.AssertionError” on one of ma XSL library.
> It use to work find with Saxon 9.8, but I get this compilation error with Saxon 9.9.
> It was not easy to isolate this error within the whole bunch of imported xsl libraries we are using.
> But I finally find the line that causes this error :
> <xsl:sequence select="els:wrap-elements-starting-with(
>       $context,
>       function($e as element()) as xs:boolean {name($e) = $starts.names},
>       $wrapper,
>       $keep-context)"/>
>  
> See below an XSLT to repro this compilation error.
> Is it a Saxon9.9 bug or something wrong in the XSLT (that was not identified by Saxon 9.8)?
>  
> Thanks in advance
> Matthieu Ricaud-Dussarget
>  
> -----------------------------------------
> XSLT to reproduce the error : 
> -----------------------------------------
>  
> <?xml version="1.0" encoding="UTF-8"?>
> <xsl:stylesheet 
>   xmlns:xsl="http://www.w3.org/1999/XSL/Transform <http://www.w3.org/1999/XSL/Transform>"
>   xmlns:xd="http://www.oxygenxml.com/ns/doc/xsl <http://www.oxygenxml.com/ns/doc/xsl>"
>   xmlns:xs="http://www.w3.org/2001/XMLSchema <http://www.w3.org/2001/XMLSchema>"
>   xmlns:els="http://www.lefebvre-sarrut.eu/ns/els <http://www.lefebvre-sarrut.eu/ns/els>"
>   exclude-result-prefixes="#all"
>   version="3.0"
>   >
>   
>   <xd:doc>
>     <xd:desc>
>       <xd:p>Wrap elements starting with specific names into a new element "wrapper" </xd:p>
>     </xd:desc>
>     <xd:param name="context">Parent of the elements to wrap</xd:param>
>     <xd:param name="starts.names">sequence of names to set starting elements</xd:param>
>     <xd:param name="wrapper">element wrapper</xd:param>
>     <xd:param name="keep-context">Say if the context should be kept or not in the result</xd:param>
>     <xd:return>context (or its content) with wrapped element</xd:return>
>   </xd:doc>
>   <xsl:function name="els:wrap-elements-starting-with-names" as="node()*">
>     <xsl:param name="context" as="element()"/>
>     <xsl:param name="starts.names" as="xs:string+"/>
>     <xsl:param name="wrapper" as="element()"/>
>     <xsl:param name="keep-context" as="xs:boolean"/>
>     <xsl:sequence select="els:wrap-elements-starting-with(
>       $context,
>       function($e as element()) as xs:boolean {name($e) = $starts.names},
>       $wrapper,
>       $keep-context)"/>
>   </xsl:function>
>   
>   <xd:doc>
>     <xd:desc>
>       <xd:p>Wrap elements starting with specific names into a new element "wrapper" </xd:p>
>     </xd:desc>
>     <xd:param name="context">Parent of the elements to wrap</xd:param>
>     <xd:param name="starts.function">xpath function to set the starting group condition</xd:param>
>     <xd:param name="wrapper">element wrapper</xd:param>
>     <xd:param name="keep-context">Say if the context should be kept or not in the result</xd:param>
>     <xd:return>context (or its content) with wrapped element</xd:return>
>   </xd:doc>
>   <xsl:function name="els:wrap-elements-starting-with" as="element()*">
>     <xsl:param name="context" as="element()"/>
>     <xsl:param name="starts.function"/> <!--as="xs:string"-->
>     <xsl:param name="wrapper" as="element()"/>
>     <xsl:param name="keep-context" as="xs:boolean"/>
>     <xsl:variable name="content" as="item()*">
>       <xsl:for-each-group select="$context/node()" group-starting-with="*[$starts.function(.)]">
>         <xsl:variable name="cg" select="current-group()" as="node()*"/>
>         <xsl:for-each select="$wrapper">
>           <xsl:copy>
>             <xsl:copy-of select="@*"/>
>             <xsl:copy-of select="$cg"/>
>           </xsl:copy>
>         </xsl:for-each>
>       </xsl:for-each-group>
>     </xsl:variable>
>     <xsl:choose>
>       <xsl:when test="$keep-context">
>         <xsl:for-each select="$context">
>           <xsl:copy>
>             <xsl:copy-of select="@*"/>
>             <xsl:sequence select="$content"/>
>           </xsl:copy>
>         </xsl:for-each>
>       </xsl:when>
>       <xsl:otherwise>
>         <xsl:sequence select="$content"/>
>       </xsl:otherwise>
>     </xsl:choose>
>   </xsl:function>
>  
> </xsl:stylesheet>
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