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/stando/www/wp-content/plugins/wordpress-seo-premium/admin/

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Current File : /home/stando/www/wp-content/plugins/wordpress-seo-premium/admin/class-gutenberg-compatibility.php
<?php
/**
 * WPSEO plugin file.
 *
 * @package WPSEO\Gutenberg_Compatibility
 */

/**
 * Class WPSEO_Gutenberg_Compatibility
 */
class WPSEO_Gutenberg_Compatibility {

	/**
	 * The currently released version of Gutenberg.
	 *
	 * @var string
	 */
	const CURRENT_RELEASE = '8.3.0';

	/**
	 * The minimally supported version of Gutenberg by the plugin.
	 *
	 * @var string
	 */
	const MINIMUM_SUPPORTED = '8.3.0';

	/**
	 * Holds the current version.
	 *
	 * @var string
	 */
	protected $current_version;

	/**
	 * WPSEO_Gutenberg_Compatibility constructor.
	 */
	public function __construct() {
		$this->current_version = $this->detect_installed_gutenberg_version();
	}

	/**
	 * Determines whether or not Gutenberg is installed.
	 *
	 * @return bool Whether or not Gutenberg is installed.
	 */
	public function is_installed() {
		return $this->current_version !== '';
	}

	/**
	 * Determines whether or not the currently installed version of Gutenberg is below the minimum supported version.
	 *
	 * @return bool True if the currently installed version is below the minimum supported version. False otherwise.
	 */
	public function is_below_minimum() {
		return version_compare( $this->current_version, $this->get_minimum_supported_version(), '<' );
	}

	/**
	 * Gets the currently installed version.
	 *
	 * @return string The currently installed version.
	 */
	public function get_installed_version() {
		return $this->current_version;
	}

	/**
	 * Determines whether or not the currently installed version of Gutenberg is the latest, fully compatible version.
	 *
	 * @return bool Whether or not the currently installed version is fully compatible.
	 */
	public function is_fully_compatible() {
		return version_compare( $this->current_version, $this->get_latest_release(), '>=' );
	}

	/**
	 * Gets the latest released version of Gutenberg.
	 *
	 * @return string The latest release.
	 */
	protected function get_latest_release() {
		return self::CURRENT_RELEASE;
	}

	/**
	 * Gets the minimum supported version of Gutenberg.
	 *
	 * @return string The minumum supported release.
	 */
	protected function get_minimum_supported_version() {
		return self::MINIMUM_SUPPORTED;
	}

	/**
	 * Detects the currently installed Gutenberg version.
	 *
	 * @return string The currently installed Gutenberg version. Empty if the version couldn't be detected.
	 */
	protected function detect_installed_gutenberg_version() {
		if ( defined( 'GUTENBERG_VERSION' ) ) {
			return GUTENBERG_VERSION;
		}

		return '';
	}
}

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