def needs_quotes(s):
    """Checks whether a string is a dot language ID.

    It will check whether the string is solely composed
    by the characters allowed in an ID or not.
    If the string is one of the reserved keywords it will
    need quotes too but the user will need to add them
    manually.
    """

    # If the name is a reserved keyword it will need quotes but pydot
    # can't tell when it's being used as a keyword or when it's simply
    # a name. Hence the user needs to supply the quotes when an element
    # would use a reserved keyword as name. This function will return
    # false indicating that a keyword string, if provided as-is, won't
    # need quotes.
    if s in dot_keywords:
        return False

    chars = [ord(c) for c in s if ord(c) > 0x7F or ord(c) == 0]
    if chars and not id_re_dbl_quoted.match(s) and not id_re_html.match(s):
        return True

    for test_re in [
        id_re_alpha_nums,
        id_re_num,
        id_re_dbl_quoted,
        id_re_html,
        id_re_alpha_nums_with_ports,
    ]:
        if test_re.match(s):
            return False

    m = id_re_with_port.match(s)
    if m:
        return needs_quotes(m.group(1)) or needs_quotes(m.group(2))

    return True
Checks whether a string is a dot language ID.

    It will check whether the string is solely composed
    by the characters allowed in an ID or not.
    If the string is one of the reserved keywords it will
    need quotes too but the user will need to add them
    manually.
    
python/aitemplate/utils/visualization/pydot.py