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 : //usr/share/perl5/URI/_idna.pm
package URI::_idna;

# This module implements the RFCs 3490 (IDNA) and 3491 (Nameprep)
# based on Python-2.6.4/Lib/encodings/idna.py

use strict;
use warnings;

use URI::_punycode qw(encode_punycode decode_punycode);
use Carp qw(croak);

our $VERSION = '1.73';
$VERSION = eval $VERSION;

BEGIN {
  *URI::_idna::_ENV_::JOIN_LEAKS_UTF8_FLAGS = "$]" < 5.008_003
    ? sub () { 1 }
    : sub () { 0 }
  ;
}

my $ASCII = qr/^[\x00-\x7F]*\z/;

sub encode {
    my $idomain = shift;
    my @labels = split(/\./, $idomain, -1);
    my @last_empty;
    push(@last_empty, pop @labels) if @labels > 1 && $labels[-1] eq "";
    for (@labels) {
	$_ = ToASCII($_);
    }

    return eval 'join(".", @labels, @last_empty)' if URI::_idna::_ENV_::JOIN_LEAKS_UTF8_FLAGS;
    return join(".", @labels, @last_empty);
}

sub decode {
    my $domain = shift;
    return join(".", map ToUnicode($_), split(/\./, $domain, -1))
}

sub nameprep { # XXX real implementation missing
    my $label = shift;
    $label = lc($label);
    return $label;
}

sub check_size {
    my $label = shift;
    croak "Label empty" if $label eq "";
    croak "Label too long" if length($label) > 63;
    return $label;
}

sub ToASCII {
    my $label = shift;
    return check_size($label) if $label =~ $ASCII;

    # Step 2: nameprep
    $label = nameprep($label);
    # Step 3: UseSTD3ASCIIRules is false
    # Step 4: try ASCII again
    return check_size($label) if $label =~ $ASCII;

    # Step 5: Check ACE prefix
    if ($label =~ /^xn--/) {
        croak "Label starts with ACE prefix";
    }

    # Step 6: Encode with PUNYCODE
    $label = encode_punycode($label);

    # Step 7: Prepend ACE prefix
    $label = "xn--$label";

    # Step 8: Check size
    return check_size($label);
}

sub ToUnicode {
    my $label = shift;
    $label = nameprep($label) unless $label =~ $ASCII;
    return $label unless $label =~ /^xn--/;
    my $result = decode_punycode(substr($label, 4));
    my $label2 = ToASCII($result);
    if (lc($label) ne $label2) {
	croak "IDNA does not round-trip: '\L$label\E' vs '$label2'";
    }
    return $result;
}

1;

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