def get_lexer_for_filename(_fn, code=None, **options):
    """
    Get a lexer for a filename.  If multiple lexers match the filename
    pattern, use ``analyze_text()`` to figure out which one is more
    appropriate.
    """
    matches = []
    fn = basename(_fn)
    for modname, name, _, filenames, _ in LEXERS.itervalues():
        for filename in filenames:
            if fnmatch.fnmatch(fn, filename):
                if name not in _lexer_cache:
                    _load_lexers(modname)
                matches.append(_lexer_cache[name])
    for cls in find_plugin_lexers():
        for filename in cls.filenames:
            if fnmatch.fnmatch(fn, filename):
                matches.append(cls)

    if sys.version_info > (3,) and isinstance(code, bytes):
        # decode it, since all analyse_text functions expect unicode
        code = code.decode('latin1')

    def get_rating(cls):
        # The class _always_ defines analyse_text because it's included in
        # the Lexer class.  The default implementation returns None which
        # gets turned into 0.0.  Run scripts/detect_missing_analyse_text.py
        # to find lexers which need it overridden.
        d = cls.analyse_text(code)
        #print "Got %r from %r" % (d, cls)
        return d

    if code:
        matches.sort(key=get_rating)
    if matches:
        #print "Possible lexers, after sort:", matches
        return matches[-1](**options)
    raise ClassNotFound('no lexer for filename %r found' % _fn)
dataset/ETHPy150Open adieu/allbuttonspressed/pygments/lexers/__init__.py/get_lexer_for_filename/original