Saxon » SaxonC

Using Saxon 12 (installed w/pypi) on Python 3.8.

transform_to_file() seems to try to use the output file as input.

If I try the following python without an existing output file "simple_output.xml":

from saxonche import *


def run():
    with PySaxonProcessor(license=False) as proc:
        print(f"Processor version: {proc.version}")
        xsltproc = proc.new_xslt30_processor()
        xsltproc.transform_to_file(source_file=r"try_saxon_input.xml",
                                   stylesheet_file=r"simple.xsl",
                                   output_file=r"simple_output.xml")


for x in range(0, 3):
    run()

I get the following console output (I get this 3 times, but only including once for brevity. Also, I'm running this in PyCharm.):

Processor version: SaxonC-HE 12.0 from Saxonica
Error 
   I/O error reported by XML parser processing simple_output.xml. Caused by
  java.io.FileNotFoundException: C:\Users\Dan Haley\Desktop\try_saxon\simple_output.xml (The
  system cannot find the file specified)

If I create a file named "simple_output.xml" with the content <foo/>, I don't get an exception but this is what "simple_output.xml" looks like:

<foo processed="1 2 3"/>

So it appears it's using the output as input.

Here's my XSLT if needed to reproduce:

<xsl:stylesheet version="3.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" expand-text="yes">
    <xsl:output indent="yes"/>
    <xsl:strip-space elements="*"/>
    
    <xsl:mode on-no-match="shallow-copy"/>
    
    <xsl:template match="/*">
        <xsl:copy>
            <xsl:attribute name="processed" select="let $tokens := tokenize(@processed) 
                return string-join(($tokens,count($tokens)+1),' ')"/>
            <xsl:apply-templates select="@* except @processed|node()"/>
        </xsl:copy>
    </xsl:template>
    
</xsl:stylesheet>

As a work-around, I'm first compiling the stylesheet and using the transform_to_file() method from PyXsltExecutable.