def char_code(columns, name=None):
    """
    Character set code field.

    :param name: name for the field
    :return: an instance of the Character set code field rules
    """
    if name is None:
        name = 'Char Code Field (' + str(columns) + ' columns)'

    if columns <= 0:
        raise BaseException()

    char_sets = None
    for char_set in _tables.get_data('character_set'):
        regex = '[ ]{' + str(15 - len(char_set)) + '}' + char_set
        if char_sets is None:
            char_sets = regex
        else:
            char_sets += '|' + regex

    # Accepted sets
    _character_sets = pp.Regex(char_sets)
    _unicode_1_16b = pp.Regex('U\+0[0-8,A-F]{3}[ ]{' + str(columns - 6) + '}')
    _unicode_2_21b = pp.Regex('U\+0[0-8,A-F]{4}[ ]{' + str(columns - 7) + '}')

    # Basic field
    char_code_field = (_character_sets | _unicode_1_16b | _unicode_2_21b)

    # Parse action
    char_code_field = char_code_field.setParseAction(lambda s: s[0].strip())

    # Name
    char_code_field.setName(name)

    return char_code_field
Character set code field.

    :param name: name for the field
    :return: an instance of the Character set code field rules