translit-ctypes.py

# Will cause pygobject2 be loaded.
import ibus

try:
    # pygobject3 cannot be loaded at the same time pygobject2 is
    # loaded, so this will raise an exception on Fedora 16 or later.
    from gi.repository import Translit
    Transliterator = Translit.Transliterator
except ImportError:
    # Load libtranslit through ctypes, instead of gi.  Maybe the code
    # below could be removed once ibus-table switches to pygobject3.
    import ctypes

    class Transliterator(object):
        __libtranslit = ctypes.CDLL("libtranslit.so",
                                    mode=ctypes.RTLD_GLOBAL)

        __get = __libtranslit.translit_transliterator_get
        __get.argtypes = [ctypes.c_char_p,
                          ctypes.c_char_p]
        __get.restype = ctypes.c_void_p

        __transliterate = __libtranslit.translit_transliterator_transliterate
        __transliterate.argtypes = [ctypes.c_void_p,
                                    ctypes.c_char_p,
                                    ctypes.c_void_p]
        __transliterate.restype = ctypes.c_char_p

        def __init__(self, trans):
            self.__trans = trans

        @staticmethod
        def get(backend, name):
            return Transliterator(Transliterator.__get(backend, name))

        def transliterate(self, _input):
            endpos = ctypes.c_ulong()
            output = Transliterator.__transliterate(self.__trans,
                                                    _input,
                                                    ctypes.byref(endpos))
            return (output, endpos.value)

if __name__ == "__main__":
    trans = Transliterator.get("m17n", "hi-inscript")
    print trans.transliterate("ab")