I have an application that needs to write I18N data to XML, using UTF-8 encoding, running on Python 2.7. See attached schema, and example program. I generated the foo.py wrapper as follows:
generateDS.py -qf -o foo.py --external-encoding='utf-8' --export="write"
foo.xsd
When I run the test program, I get the following error:
Traceback (most recent call last):
File "mintest.py", line 15, in <module>
a.export( out, 0 )
File "/home/ctrader/src/gds-test/foo.py", line 648, in export
self.exportChildren(outfile, level + 1, namespace_, name_,
pretty_print=pretty_print)
File "/home/ctrader/src/gds-test/foo.py", line 668, in exportChildren
outfile.write('<%sfoo>%s</%sfoo>%s' % (namespace_,
self.gds_format_string(quote_xml(self.foo).encode(ExternalEncoding),
input_name='foo'), namespace_, eol_))
File "/home/ctrader/foo/lib/python2.7/codecs.py", line 691, in write
return self.writer.write(data)
File "/home/ctrader/foo/lib/python2.7/codecs.py", line 351, in write
data, consumed = self.encode(object, self.errors)
UnicodeDecodeError: 'ascii' codec can't decode byte 0xd9 in position 5:
ordinal not in range(128)
After a long debugging session, I determined that the problem is that the
code that generateDS generates for the export methods uses regular strings,
not unicode strings, for its constants. When you concatenate 'aaa' + X +
'ccc', it works fine, as long as X is a regular string, or a unicode string
containing only ASCII characters. When X isn't ASCII, you get the exception
I noted above.
For my short-term problem, I went through the entire generateDS.py program
and converted every statement that emits code for the wrapper classes to
emit unicode constants instead of string constants, and got rid of the
calls to gds_format_string(), but that's not a good long-term fix.
Can anyone suggest a better solution?
Other problems observed:
- gDS doesn't generate the <?xml ?> directive at the start of the export.
- gDS does not deal well with complex namespaces in schemas.
I worked around both of those by writing my data to a string, and then
massaging the string before writing the result to a file. Again, it works
in the short-term, but isn't a long-term solution.
- Craig -
foo.xsd
Description: Binary data
mintest.py
Description: Binary data
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