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/stando/public_html/wp-content/plugins/wordpress-seo-premium/lib/migrations/column.php
<?php
/**
 * Yoast migrations adapter class.
 *
 * @package Yoast\WP\Lib\Migrations
 */

namespace Yoast\WP\Lib\Migrations;

use Exception;

/**
 * Column class
 */
class Column {

	/**
	 * The adapter.
	 *
	 * @var Adapter
	 */
	private $adapter;

	/**
	 * The name.
	 *
	 * @var string
	 */
	public $name;

	/**
	 * The type.
	 *
	 * @var mixed
	 */
	public $type;

	/**
	 * The properties.
	 *
	 * @var mixed
	 */
	public $properties;

	/**
	 * The options.
	 *
	 * @var array
	 */
	private $options = [];

	/**
	 * Creates an instance of a column.
	 *
	 * @param Adapter $adapter The current adapter.
	 * @param string  $name    the name of the column.
	 * @param string  $type    the type of the column.
	 * @param array   $options the column options.
	 *
	 * @throws Exception If invalid arguments provided.
	 *
	 * @return Column
	 */
	public function __construct( $adapter, $name, $type, $options = [] ) {
		if ( ! $adapter instanceof Adapter ) {
			throw new Exception( 'Invalid Adapter instance.' );
		}
		if ( empty( $name ) || ! \is_string( $name ) ) {
			throw new Exception( "Invalid 'name' parameter" );
		}
		if ( empty( $type ) || ! \is_string( $type ) ) {
			throw new Exception( "Invalid 'type' parameter" );
		}
		$this->adapter = $adapter;
		$this->name     = $name;
		$this->type     = $type;
		$this->options = $options;
	}

	/**
	 * Returns the SQL of this column.
	 *
	 * @return string
	 */
	public function to_sql() {
		$column_sql = \sprintf( '%s %s', $this->adapter->identifier( $this->name ), $this->sql_type() );
		$column_sql .= $this->adapter->add_column_options( $this->type, $this->options );
		return $column_sql;
	}

	/**
	 * The SQL string version.
	 *
	 * @return string
	 */
	public function __toString() {
		return $this->to_sql();
	}
	/**
	 * The SQL type.
	 *
	 * @return string
	 */
	private function sql_type() {
		return $this->adapter->type_to_sql( $this->type, $this->options );
	}
}

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