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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Directory :  /home/akaindir/www/crm/libraries/htmlpurifier/library/HTMLPurifier/AttrDef/URI/

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Current File : /home/akaindir/www/crm/libraries/htmlpurifier/library/HTMLPurifier/AttrDef/URI/Host.php
<?php

/**
 * Validates a host according to the IPv4, IPv6 and DNS (future) specifications.
 */
class HTMLPurifier_AttrDef_URI_Host extends HTMLPurifier_AttrDef
{

    /**
     * Instance of HTMLPurifier_AttrDef_URI_IPv4 sub-validator
     */
    protected $ipv4;

    /**
     * Instance of HTMLPurifier_AttrDef_URI_IPv6 sub-validator
     */
    protected $ipv6;

    public function __construct() {
        $this->ipv4 = new HTMLPurifier_AttrDef_URI_IPv4();
        $this->ipv6 = new HTMLPurifier_AttrDef_URI_IPv6();
    }

    public function validate($string, $config, $context) {
        $length = strlen($string);
        if ($string === '') return '';
        if ($length > 1 && $string[0] === '[' && $string[$length-1] === ']') {
            //IPv6
            $ip = substr($string, 1, $length - 2);
            $valid = $this->ipv6->validate($ip, $config, $context);
            if ($valid === false) return false;
            return '['. $valid . ']';
        }

        // need to do checks on unusual encodings too
        $ipv4 = $this->ipv4->validate($string, $config, $context);
        if ($ipv4 !== false) return $ipv4;

        // A regular domain name.

        // This breaks I18N domain names, but we don't have proper IRI support,
        // so force users to insert Punycode. If there's complaining we'll
        // try to fix things into an international friendly form.

        // The productions describing this are:
        $a   = '[a-z]';     // alpha
        $an  = '[a-z0-9]';  // alphanum
        $and = '[a-z0-9-]'; // alphanum | "-"
        // domainlabel = alphanum | alphanum *( alphanum | "-" ) alphanum
        $domainlabel   = "$an($and*$an)?";
        // toplabel    = alpha | alpha *( alphanum | "-" ) alphanum
        $toplabel      = "$a($and*$an)?";
        // hostname    = *( domainlabel "." ) toplabel [ "." ]
        $match = preg_match("/^($domainlabel\.)*$toplabel\.?$/i", $string);
        if (!$match) return false;

        return $string;
    }

}

// vim: et sw=4 sts=4

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