Process a file.

def process(fname, allow_type):
    """Process a file."""
    fname = str(fname)
    # HACK: ignore op.h which is automatically generated
    if fname.endswith('op.h'):
      return
    arr = fname.rsplit('.', 1)
    if fname.find('#') != -1 or arr[-1] not in allow_type:
        return
    if arr[-1] in CXX_SUFFIX:
        _HELPER.process_cpp(fname, arr[-1])
    if arr[-1] in PYTHON_SUFFIX:
        _HELPER.process_python(fname)