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 : /home/akaindir/public_html/crm/libraries/htmlpurifier/library/HTMLPurifier/URISchemeRegistry.php
<?php

/**
 * Registry for retrieving specific URI scheme validator objects.
 */
class HTMLPurifier_URISchemeRegistry
{

    /**
     * Retrieve sole instance of the registry.
     * @param $prototype Optional prototype to overload sole instance with,
     *                   or bool true to reset to default registry.
     * @note Pass a registry object $prototype with a compatible interface and
     *       the function will copy it and return it all further times.
     */
    public static function instance($prototype = null) {
        static $instance = null;
        if ($prototype !== null) {
            $instance = $prototype;
        } elseif ($instance === null || $prototype == true) {
            $instance = new HTMLPurifier_URISchemeRegistry();
        }
        return $instance;
    }

    /**
     * Cache of retrieved schemes.
     */
    protected $schemes = array();

    /**
     * Retrieves a scheme validator object
     * @param $scheme String scheme name like http or mailto
     * @param $config HTMLPurifier_Config object
     * @param $config HTMLPurifier_Context object
     */
    public function getScheme($scheme, $config, $context) {
        if (!$config) $config = HTMLPurifier_Config::createDefault();
        $null = null; // for the sake of passing by reference

        // important, otherwise attacker could include arbitrary file
        $allowed_schemes = $config->get('URI', 'AllowedSchemes');
        if (!$config->get('URI', 'OverrideAllowedSchemes') &&
            !isset($allowed_schemes[$scheme])
        ) {
            return $null;
        }

        if (isset($this->schemes[$scheme])) return $this->schemes[$scheme];
        if (!isset($allowed_schemes[$scheme])) return $null;

        $class = 'HTMLPurifier_URIScheme_' . $scheme;
        if (!class_exists($class)) return $null;
        $this->schemes[$scheme] = new $class();
        return $this->schemes[$scheme];
    }

    /**
     * Registers a custom scheme to the cache, bypassing reflection.
     * @param $scheme Scheme name
     * @param $scheme_obj HTMLPurifier_URIScheme object
     */
    public function register($scheme, $scheme_obj) {
        $this->schemes[$scheme] = $scheme_obj;
    }

}

// vim: et sw=4 sts=4

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