Bug #4847: sotransformToString - Python - SaxonC - Saxonica Developer Community

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Bug #4847

closed

sotransformToString - Python

Added by David Zabala about 4 years ago. Updated almost 3 years ago.

Status:

Closed

Priority:

Normal

Assignee:

O'Neil Delpratt

Category:

C++ API

Start date:

2020-12-02

Due date:

% Done:

Estimated time:

Applies to branch:

Fix Committed on Branch:

Fixed in Maintenance Release:

Found in version:

1.2.1

Fixed in version:

11.1

SaxonC Languages:

SaxonC Platforms:

SaxonC Architecture:

Description

I am trying to get the xls messages (xsl:message) using the following code:

        xsltproc = proc.new_xslt30_processor()

        outputi = xsltproc.transform_to_string(source_file="source.xml", stylesheet_file="style.xsl")

        print(outputi) #This Works

        msg = xsltproc.get_xsl_messages()

And I get the following error:

/usr/lib/libsaxonhec.sotransformToString not found

Files

Xslt30Processor.cpp (62.1 KB) Xslt30Processor.cpp

O'Neil Delpratt, 2020-12-03 11:27

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Updated by O'Neil Delpratt about 4 years ago

Project changed from Saxon to SaxonC
Category changed from User error to Python Build
Assignee set to O'Neil Delpratt
Priority changed from Low to Normal
Found in version set to 1.2.1

Thanks for reporting this issue. It looks like a bug in the JNI. Investigating it now

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Updated by O'Neil Delpratt about 4 years ago

File Xslt30Processor.cpp Xslt30Processor.cpp added
Category changed from Python Build to C++ API

I managed to reproduce the error message and it is bug.

The problem is the return type used in the internal JNI method signature in the C++ code is wrong. The bug has been fixed in a redesign of the xsl:message mechanism to make it more usable. This will be available in the next release, but as I workaround see below.

In the method getXslMessage of the class file Xslt30Processor.cpp we currently have the following:

jmethodID mID =   (jmethodID) SaxonProcessor::sxn_environ->env->GetMethodID(cppClass,
					"getXslMessages",
					"()[Lnet/sf/saxon/s9api/XdmValue;");

Please replace it with the following:

jmethodID mID =   (jmethodID) SaxonProcessor::sxn_environ->env->GetMethodID(cppClass,
					"getXslMessages",
					"()[Lnet/sf/saxon/s9api/XdmNode;");

I have also attached the file to this bug with the patch so you can just drop and replace the file if that is easier. Then rebuild the Saxon/C python extension again.

What actually happens to the xsl:messages by default is to output messages to the standard output console, but this does not find its way to python. As mentioned in the bug issue #4147 to capture the messages you will have to call xsltproc.set_property('m', '') before you do the transformation. See example python code below which should work for you:

        xsltproc = proc.new_xslt30_processor()

        xsltproc.set_property('m', '') #This flag creates a Message Listener which intercepts the messages to return `PyXdmNode` objects of the messages

        outputi = xsltproc.transform_to_string(source_file="source.xml", stylesheet_file="style.xsl")

        print(outputi) #This Works

        messages = xsltproc.get_xsl_messages()
        if messages is not None:
            i = 0
            while i < messages.size:
                print(messages.item_at(i))
                i += 1