Saxon » SaxonC

I wonder whether/how a dynamic error occurring during a call to a system function can be handled from the Python API.

Example:

from saxonche import *

with PySaxonProcessor(license=True) as proc:
    print(proc.version)
    parse_ietf_date = PyXdmFunctionItem().get_system_function(proc, "{http://www.w3.org/2005/xpath-functions}parse-ietf-date", 1)
    for date in ["Wed, 06 Jun 1994 07:29:35 GMT", "We, 06 Jun 1994 07:29:35 GMT"]:
        date_xdm_string = proc.make_string_value(date)
        result = parse_ietf_date.call(proc, [date_xdm_string])
        if proc.exception_occurred:
            print(proc.error_message)
        else:
            print(result)

Output (probably from System.err) shows the dynamic error but the code doesn't seem to notice on proc.exception occurred:

SaxonC-HE 12.0 from Saxonica
1994-06-06T07:29:35Z
None
Exception found in XdmFunctionItem.call Message= Invalid IETF date value We, 06 Jun 1994 07:29:35 GMT (String expected to begin with month name or day name (or day number))

I also tried with Python's try/except but it doesn't seem to catch that e.g.

from saxonche import *

with PySaxonProcessor(license=True) as proc:
    print(proc.version)
    parse_ietf_date = PyXdmFunctionItem().get_system_function(proc, "{http://www.w3.org/2005/xpath-functions}parse-ietf-date", 1)
    for date in ["Wed, 06 Jun 1994 07:29:35 GMT", "We, 06 Jun 1994 07:29:35 GMT"]:
        date_xdm_string = proc.make_string_value(date)
        try:
            result = parse_ietf_date.call(proc, [date_xdm_string])
            print(result)
        except Exception as err:
            print('Error during function call', err)

outputs

Exception found in XdmFunctionItem.call Message= Invalid IETF date value We, 06 Jun 1994 07:29:35 GMT (String expected to begin with month name or day name (or day number))
SaxonC-HE 12.0 from Saxonica
1994-06-06T07:29:35Z
None