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/www/crm/libraries/htmlpurifier/library/HTMLPurifier/AttrTransform.php
<?php

/**
 * Processes an entire attribute array for corrections needing multiple values.
 *
 * Occasionally, a certain attribute will need to be removed and popped onto
 * another value.  Instead of creating a complex return syntax for
 * HTMLPurifier_AttrDef, we just pass the whole attribute array to a
 * specialized object and have that do the special work.  That is the
 * family of HTMLPurifier_AttrTransform.
 *
 * An attribute transformation can be assigned to run before or after
 * HTMLPurifier_AttrDef validation.  See HTMLPurifier_HTMLDefinition for
 * more details.
 */

abstract class HTMLPurifier_AttrTransform
{

    /**
     * Abstract: makes changes to the attributes dependent on multiple values.
     *
     * @param $attr Assoc array of attributes, usually from
     *              HTMLPurifier_Token_Tag::$attr
     * @param $config Mandatory HTMLPurifier_Config object.
     * @param $context Mandatory HTMLPurifier_Context object
     * @returns Processed attribute array.
     */
    abstract public function transform($attr, $config, $context);

    /**
     * Prepends CSS properties to the style attribute, creating the
     * attribute if it doesn't exist.
     * @param $attr Attribute array to process (passed by reference)
     * @param $css CSS to prepend
     */
    public function prependCSS(&$attr, $css) {
        $attr['style'] = isset($attr['style']) ? $attr['style'] : '';
        $attr['style'] = $css . $attr['style'];
    }

    /**
     * Retrieves and removes an attribute
     * @param $attr Attribute array to process (passed by reference)
     * @param $key Key of attribute to confiscate
     */
    public function confiscateAttr(&$attr, $key) {
        if (!isset($attr[$key])) return null;
        $value = $attr[$key];
        unset($attr[$key]);
        return $value;
    }

}

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