def METHOD_NAME(directory,subdir,fname):
    ext = splitext(fname)[1]
    if ext=='.lum':  return LumFile(directory,subdir,fname)
    if ext=='.luma': return LumaFile(directory,subdir,fname)
    if ext=='.css':  return CSSFile(directory,subdir,fname)
    if ext=='.svg':  return SVGFile(directory,subdir,fname)
    return VerbatimFile(directory,subdir,fname)