[jira] [Updated] (XALANJ-2809) XPTY0004 when using fold-left and XSLT defined function, followed by java.lang.NullPointerException

["Martin Honnen (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/XALANJ-2809?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Martin Honnen updated XALANJ-2809:
----------------------------------
    Attachment: sample1.xml
                pass-document-node-to-xslt-function-test1.xsl
                fold-left-seq-of-stylesheets-transform4.xsl
                sheet3.xsl
                sheet2.xsl
                sheet1.xsl

> XPTY0004 when using fold-left and XSLT defined function, followed by java.lang.NullPointerException
> ---------------------------------------------------------------------------------------------------
>
>                 Key: XALANJ-2809
>                 URL: https://issues.apache.org/jira/browse/XALANJ-2809
>             Project: XalanJ2
>          Issue Type: Bug
>      Security Level: No security risk; visible to anyone(Ordinary problems in Xalan projects.  Anybody can view the issue.) 
>          Components: transformation, Xalan, Xalan-CmdLine, Xalan-interpretive, XPath-function
>    Affects Versions: The Latest Development Code
>         Environment: Java 8, Windows 11
>            Reporter: Martin Honnen
>            Priority: Major
>         Attachments: fold-left-seq-of-stylesheets-transform4.xsl, pass-document-node-to-xslt-function-test1.xsl, sample1.xml, sheet1.xsl, sheet2.xsl, sheet3.xsl
>
>
> This is a bug report against the XSLT 3.0 development branch of Xalan.
> I am still trying to use the function fold-left with some XSLT defined function but run into a strange error "XPTY0004 Function call argument at position 1 for function
> {http://example.com/mf}
> identity(), doesn't match the declared parameter type node()" followed by a java.lang.NullPointerException.
> {code:xml}
> <?xml version="1.0" encoding="utf-8"?>
> <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
>   version="3.0"
>   xmlns:xs="http://www.w3.org/2001/XMLSchema"
>   xmlns:mf="http://example.com/mf"
>   exclude-result-prefixes="xs mf">
>   <xsl:output method="xml" indent="yes"/>
>   <xsl:function name="mf:identity" as="node()">
>     <xsl:param name="node" as="node()"/>
>     <xsl:sequence select="$node"/>
>   </xsl:function>
>   <xsl:template match="/">
>     <xsl:copy>
>       <xsl:sequence select="fold-left(//*, (), function($a, $n) { ($a, mf:identity($n)) })"/>
>     </xsl:copy>
>   </xsl:template>
> </xsl:stylesheet>
> {code}
> Run that against any XML input and you will get the XPTY0004 for each element node in the input followed by the NullPointerException.
>  
> The code runs with with Saxon HE 12.5 Java as well as SaxonJS so I think it is clean and proper XSLT 3.
>  
> The shown code is a reduced test case whether I can get any node passed from fold-left to an XSLT defined function, my real use case is using fold-left to chain calls of the transform function, as I get the same error "XPTY0004 : Function call argument at position 1 for function \{http://example.com/mf}transform-node(), doesn't match the declared parameter type node()" there I hope if the simple test case can be fixed the real use case also works.
> For completeness I tried to attach the real use as well but somehow attaching currently fails. I will try to attach the file later after I have created the bug issue.
>  
>  



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