晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Current File : //lib/python3.6/site-packages/idna/codec.py
from .core import encode, decode, alabel, ulabel, IDNAError
import codecs
import re

_unicode_dots_re = re.compile(u'[\u002e\u3002\uff0e\uff61]')

class Codec(codecs.Codec):

    def encode(self, data, errors='strict'):

        if errors != 'strict':
            raise IDNAError("Unsupported error handling \"{0}\"".format(errors))

        if not data:
            return "", 0

        return encode(data), len(data)

    def decode(self, data, errors='strict'):

        if errors != 'strict':
            raise IDNAError("Unsupported error handling \"{0}\"".format(errors))

        if not data:
            return u"", 0

        return decode(data), len(data)

class IncrementalEncoder(codecs.BufferedIncrementalEncoder):
    def _buffer_encode(self, data, errors, final):
        if errors != 'strict':
            raise IDNAError("Unsupported error handling \"{0}\"".format(errors))

        if not data:
            return ("", 0)

        labels = _unicode_dots_re.split(data)
        trailing_dot = u''
        if labels:
            if not labels[-1]:
                trailing_dot = '.'
                del labels[-1]
            elif not final:
                # Keep potentially unfinished label until the next call
                del labels[-1]
                if labels:
                    trailing_dot = '.'

        result = []
        size = 0
        for label in labels:
            result.append(alabel(label))
            if size:
                size += 1
            size += len(label)

        # Join with U+002E
        result = ".".join(result) + trailing_dot
        size += len(trailing_dot)
        return (result, size)

class IncrementalDecoder(codecs.BufferedIncrementalDecoder):
    def _buffer_decode(self, data, errors, final):
        if errors != 'strict':
            raise IDNAError("Unsupported error handling \"{0}\"".format(errors))

        if not data:
            return (u"", 0)

        # IDNA allows decoding to operate on Unicode strings, too.
        if isinstance(data, unicode):
            labels = _unicode_dots_re.split(data)
        else:
            # Must be ASCII string
            data = str(data)
            unicode(data, "ascii")
            labels = data.split(".")

        trailing_dot = u''
        if labels:
            if not labels[-1]:
                trailing_dot = u'.'
                del labels[-1]
            elif not final:
                # Keep potentially unfinished label until the next call
                del labels[-1]
                if labels:
                    trailing_dot = u'.'

        result = []
        size = 0
        for label in labels:
            result.append(ulabel(label))
            if size:
                size += 1
            size += len(label)

        result = u".".join(result) + trailing_dot
        size += len(trailing_dot)
        return (result, size)


class StreamWriter(Codec, codecs.StreamWriter):
    pass

class StreamReader(Codec, codecs.StreamReader):
    pass

def getregentry():
    return codecs.CodecInfo(
        name='idna',
        encode=Codec().encode,
        decode=Codec().decode,
        incrementalencoder=IncrementalEncoder,
        incrementaldecoder=IncrementalDecoder,
        streamwriter=StreamWriter,
        streamreader=StreamReader,
    )

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