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。 sh-3ll

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<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\Templating\Asset;

/**
 * The path packages adds a version and a base path to asset URLs.
 *
 * @author Kris Wallsmith <kris@symfony.com>
 */
class PathPackage extends Package
{
    private $basePath;

    /**
     * Constructor.
     *
     * @param string $basePath The base path to be prepended to relative paths
     * @param string $version  The package version
     * @param string $format   The format used to apply the version
     */
    public function __construct($basePath = null, $version = null, $format = null)
    {
        parent::__construct($version, $format);

        if (!$basePath) {
            $this->basePath = '/';
        } else {
            if ('/' != $basePath[0]) {
                $basePath = '/'.$basePath;
            }

            $this->basePath = rtrim($basePath, '/').'/';
        }
    }

    public function getUrl($path)
    {
        if (false !== strpos($path, '://') || 0 === strpos($path, '//')) {
            return $path;
        }

        $url = $this->applyVersion($path);

        // apply the base path
        if ('/' !== substr($url, 0, 1)) {
            $url = $this->basePath.$url;
        }

        return $url;
    }

    /**
     * Returns the base path.
     *
     * @return string The base path
     */
    public function getBasePath()
    {
        return $this->basePath;
    }
}