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  #   l=J25*}@-\Tţ2 ?     from __future__ import unicode_literals
from __future__ import division
from __future__ import absolute_import
from future.builtins import str
from future.builtins import next

# Copyright (C) 2001-2007 Python Software Foundation
# Author: Ben Gertzfield, Barry Warsaw
# Contact: email-sig@python.org

__all__ = [
    'Charset',
    'add_alias',
    'add_charset',
    'add_codec',
    ]

from functools import partial

from future.backports import email
from future.backports.email import errors
from future.backports.email.encoders import encode_7or8bit


# Flags for types of header encodings
QP          = 1 # Quoted-Printable
BASE64      = 2 # Base64
SHORTEST    = 3 # the shorter of QP and base64, but only for headers

# In "=?charset?q?hello_world?=", the =?, ?q?, and ?= add up to 7
RFC2047_CHROME_LEN = 7

DEFAULT_CHARSET = 'us-ascii'
UNKNOWN8BIT = 'unknown-8bit'
EMPTYSTRING = ''


# Defaults
CHARSETS = {
    # input        header enc  body enc output conv
    'iso-8859-1':  (QP,        QP,      None),
    'iso-8859-2':  (QP,        QP,      None),
    'iso-8859-3':  (QP,        QP,      None),
    'iso-8859-4':  (QP,        QP,      None),
    # iso-8859-5 is Cyrillic, and not especially used
    # iso-8859-6 is Arabic, also not particularly used
    # iso-8859-7 is Greek, QP will not make it readable
    # iso-8859-8 is Hebrew, QP will not make it readable
    'iso-8859-9':  (QP,        QP,      None),
    'iso-8859-10': (QP,        QP,      None),
    # iso-8859-11 is Thai, QP will not make it readable
    'iso-8859-13': (QP,        QP,      None),
    'iso-8859-14': (QP,        QP,      None),
    'iso-8859-15': (QP,        QP,      None),
    'iso-8859-16': (QP,        QP,      None),
    'windows-1252':(QP,        QP,      None),
    'viscii':      (QP,        QP,      None),
    'us-ascii':    (None,      None,    None),
    'big5':        (BASE64,    BASE64,  None),
    'gb2312':      (BASE64,    BASE64,  None),
    'euc-jp':      (BASE64,    None,    'iso-2022-jp'),
    'shift_jis':   (BASE64,    None,    'iso-2022-jp'),
    'iso-2022-jp': (BASE64,    None,    None),
    'koi8-r':      (BASE64,    BASE64,  None),
    'utf-8':       (SHORTEST,  BASE64, 'utf-8'),
    }

# Aliases for other commonly-used names for character sets.  Map
# them to the real ones used in email.
ALIASES = {
    'latin_1': 'iso-8859-1',
    'latin-1': 'iso-8859-1',
    'latin_2': 'iso-8859-2',
    'latin-2': 'iso-8859-2',
    'latin_3': 'iso-8859-3',
    'latin-3': 'iso-8859-3',
    'latin_4': 'iso-8859-4',
    'latin-4': 'iso-8859-4',
    'latin_5': 'iso-8859-9',
    'latin-5': 'iso-8859-9',
    'latin_6': 'iso-8859-10',
    'latin-6': 'iso-8859-10',
    'latin_7': 'iso-8859-13',
    'latin-7': 'iso-8859-13',
    'latin_8': 'iso-8859-14',
    'latin-8': 'iso-8859-14',
    'latin_9': 'iso-8859-15',
    'latin-9': 'iso-8859-15',
    'latin_10':'iso-8859-16',
    'latin-10':'iso-8859-16',
    'cp949':   'ks_c_5601-1987',
    'euc_jp':  'euc-jp',
    'euc_kr':  'euc-kr',
    'ascii':   'us-ascii',
    }


# Map charsets to their Unicode codec strings.
CODEC_MAP = {
    'gb2312':      'eucgb2312_cn',
    'big5':        'big5_tw',
    # Hack: We don't want *any* conversion for stuff marked us-ascii, as all
    # sorts of garbage might be sent to us in the guise of 7-bit us-ascii.
    # Let that stuff pass through without conversion to/from Unicode.
    'us-ascii':    None,
    }


# Convenience functions for extending the above mappings
def add_charset(charset, header_enc=None, body_enc=None, output_charset=None):
    """Add character set properties to the global registry.

    charset is the input character set, and must be the canonical name of a
    ch