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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# Copyright (C) 2003-2007, 2009-2011 Nominum, Inc.
#
# Permission to use, copy, modify, and distribute this software and its
# documentation for any purpose with or without fee is hereby granted,
# provided that the above copyright notice and this permission notice
# appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND NOMINUM DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NOMINUM BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
# OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

import dns.exception
import dns.rdata
import dns.tokenizer

class NSAP(dns.rdata.Rdata):
    """NSAP record.

    @ivar address: a NASP
    @type address: string
    @see: RFC 1706"""

    __slots__ = ['address']

    def __init__(self, rdclass, rdtype, address):
        super(NSAP, self).__init__(rdclass, rdtype)
        self.address = address

    def to_text(self, origin=None, relativize=True, **kw):
        return "0x%s" % self.address.encode('hex_codec')

    def from_text(cls, rdclass, rdtype, tok, origin = None, relativize = True):
        address = tok.get_string()
        t = tok.get_eol()
        if address[0:2] != '0x':
            raise dns.exception.SyntaxError('string does not start with 0x')
        address = address[2:].replace('.', '')
        if len(address) % 2 != 0:
            raise dns.exception.SyntaxError('hexstring has odd length')
        address = address.decode('hex_codec')
        return cls(rdclass, rdtype, address)

    from_text = classmethod(from_text)

    def to_wire(self, file, compress = None, origin = None):
        file.write(self.address)

    def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin = None):
        address = wire[current : current + rdlen].unwrap()
        return cls(rdclass, rdtype, address)

    from_wire = classmethod(from_wire)

    def _cmp(self, other):
        return cmp(self.address, other.address)

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