Support xylib.load_stream in Python SWIG interface

[perimosocordiae]

Using the SWIG interface works great for xylib.load_file, but this usage fails:

import xylib
xylib.load_stream(open('some_file.txt'), 'text')

The resulting error message:

NotImplementedError: Wrong number or type of arguments for overloaded function 'load_stream'.
  Possible C/C++ prototypes are:
    xylib::load_stream(std::istream &,std::string const &,std::string const &)
    xylib::load_stream(std::istream &,std::string const &)

I believe the problem arises from the need to convert between a Python file object and the C++ std::istream& type. Apparently, SWIG doesn't do this automatically. I found some posts about this problem which might help:

• http://swig.10945.n7.nabble.com/Using-std-istream-from-Python-td3733.html
• http://stackoverflow.com/a/18932980/10601

[wojdyr]

wow, someone is using it :-)

I didn't know if the python bindings will be used at all, so I didn't put much work into it (swig.i is minimal). I suppose load_stream is one of a few functions that are not handled automatically by SWIG. I'll look into it when I'm back from holidays, in a few days.

[wojdyr]

Would it work for you if you had load_string() instead of load_stream()?
In addition to load_file().

[perimosocordiae]

Yeah, that would fit my needs perfectly. (I'm parsing data that's being uploaded to a web server.)

[wojdyr]

I've added load_string() that takes bytes as the first argument and uploaded new version to pypi.

[perimosocordiae]

Thank you!