Saxon » SaxonC

This is a bug. I have created the following bug issue to keep track of its progress #6324 Thanks for reporting it.

Thanks, O'Neil.

What I was trying to do was to create a sequence/a PyXdmValue and pass it to XSLT as a parameter, for instance like in this code:

from saxonche import PySaxonProcessor, PyXdmValue

with PySaxonProcessor() as saxon_proc:

    #xdm_seq = saxon_proc.new_xpath_processor().evaluate('"foo", "bar"')

    xdm_seq = PyXdmValue()
    
    xdm_seq.add_xdm_item(saxon_proc.make_string_value('test1'))

    xdm_seq.add_xdm_item(saxon_proc.make_string_value('test2'))


    xslt30_processor = saxon_proc.new_xslt30_processor()

    xslt30_executable = xslt30_processor.compile_stylesheet(stylesheet_file=r'sample1.xsl')

    xslt30_executable.set_parameter('image-names', xdm_seq)

    xslt_result = xslt30_executable.call_template_returning_value()

    print(xslt_result)

This doesn't work, instead (under Windows, at least,) gives an error

java.lang.IllegalArgumentException: Invalid handle
    at com.oracle.svm.core.handles.ObjectHandlesImpl.doGet(ObjectHandlesImpl.java:232)
    at com.oracle.svm.core.handles.ObjectHandlesImpl.get(ObjectHandlesImpl.java:220)
    at net.sf.saxon.option.cpp.ProcessorDataAccumulator.addProcessorValue(ProcessorDataAccumulator.java:139)

I can't tell from the bug https://saxonica.plan.io/issues/6324 you have created if the above will work once that bug is fixed or whether there is an additional problem. I hope you can investigate that as well, at least once you have a fix for https://saxonica.plan.io/issues/6324.

A sample stylesheet for the above Python code is e.g.

<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
  xmlns:axsl="http://www.w3.org/1999/XSL/Transform-alias"
  version="3.0"
  xmlns:xs="http://www.w3.org/2001/XMLSchema"
  exclude-result-prefixes="#all">
  
  <xsl:namespace-alias stylesheet-prefix="axsl" result-prefix="xsl"/>
  
  <xsl:param name="image-names" as="xs:string*" select="'ABC', 'MNO'"/>

  <xsl:output method="xml" indent="yes"/>

  <xsl:template match="/" name="xsl:initial-template">
    <axsl:stylesheet version="3.0">
      <axsl:template name="Dunning">
        <axsl:param name="Image"/>
        <axsl:choose>
            <axsl:when test="$Image = '{$image-names[1]}'">
                <axsl:text>Found</axsl:text>
            </axsl:when>
            <axsl:when test="$Image = '{$image-names[2]}'">
                <axsl:text>NotFound</axsl:text>
            </axsl:when>
        </axsl:choose>
     </axsl:template>
    </axsl:stylesheet>
  </xsl:template>

</xsl:stylesheet>

Thanks for the update. For the first issue the problem is the reference count is not being incremented when an XdmItem is added to the XdmValue using add_xdm_item. I have fixed the issue and will update the bug issue. The workaround is to create an XdmAtomicValue with a variable.

For the following code:

xdm_value.add_xdm_item(saxon_proc.make_string_value('foo'))

The workaround works for me:

avalue = saxon_proc.make_string_value('foo')
    xdm_value.add_xdm_item(avalue)

RE: PyXdmValue creation and population is relating to the same issue.

workaround:

from saxoncee import PySaxonProcessor, PyXdmValue

with PySaxonProcessor() as saxon_proc:

    #xdm_seq = saxon_proc.new_xpath_processor().evaluate('"foo", "bar"')

    xdm_seq = PyXdmValue()
    avalue1 = saxon_proc.make_string_value('test1')
    avalue2 = saxon_proc.make_string_value('test12')    
    xdm_seq.add_xdm_item(avalue1)

    xdm_seq.add_xdm_item(avalue2)


    xslt30_processor = saxon_proc.new_xslt30_processor()

    xslt30_executable = xslt30_processor.compile_stylesheet(stylesheet_file=r'sample1.xsl')

    xslt30_executable.set_parameter('image-names', xdm_seq)

    xslt_result = xslt30_executable.call_template_returning_value()

    print(xslt_result)

but this will be fixed in the next maintenance release.

Thanks again, O'Neil,

that workaround indeed works fine.

Interestingly enough if I try to reuse a single variable e.g.

    xdm_seq = PyXdmValue()

    xdm_string = saxon_proc.make_string_value('DEF')

    xdm_seq.add_xdm_item(xdm_string)

    xdm_string = saxon_proc.make_string_value('PQR')

    xdm_seq.add_xdm_item(xdm_string)

    xslt30_executable.set_parameter('image-names', xdm_seq)

    stylesheet_result = xslt30_executable.call_template_returning_value()

    print(stylesheet_result)

I get the same or very similar error I mentioned in https://saxonica.plan.io/boards/4/topics/9589?r=9591#message-9591:

java.lang.IllegalArgumentException: Invalid handle
    at com.oracle.svm.core.handles.ObjectHandlesImpl.doGet(ObjectHandlesImpl.java:232)
    at com.oracle.svm.core.handles.ObjectHandlesImpl.get(ObjectHandlesImpl.java:220)
    at net.sf.saxon.option.cpp.ProcessorDataAccumulator.addProcessorValue(ProcessorDataAccumulator.java:139)