<?php
/**
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 * http://www.gnu.org/copyleft/gpl.html
 *
 * @file
 */

/**
 * Wrapper around strtr() that holds replacements
 */
class ReplacementArray {
	private $data = [];

	/**
	 * Create an object with the specified replacement array
	 * The array should have the same form as the replacement array for strtr()
	 * @param array $data
	 */
	public function __construct( array $data = [] ) {
		$this->data = $data;
	}

	/**
	 * @return array
	 */
	public function __sleep() {
		return [ 'data' ];
	}

	/**
	 * Set the whole replacement array at once
	 * @param array $data
	 */
	public function setArray( array $data ) {
		$this->data = $data;
	}

	/**
	 * @return array
	 */
	public function getArray() {
		return $this->data;
	}

	/**
	 * Set an element of the replacement array
	 * @param string $from
	 * @param string $to
	 */
	public function setPair( $from, $to ) {
		$this->data[$from] = $to;
	}

	/**
	 * @param array $data
	 */
	public function mergeArray( $data ) {
		$this->data = $data + $this->data;
	}

	/**
	 * @param ReplacementArray $other
	 */
	public function merge( ReplacementArray $other ) {
		$this->data = $other->data + $this->data;
	}

	/**
	 * @param string $from
	 */
	public function removePair( $from ) {
		unset( $this->data[$from] );
	}

	/**
	 * @param array $data
	 */
	public function removeArray( $data ) {
		foreach ( $data as $from => $to ) {
			$this->removePair( $from );
		}
	}

	/**
	 * @param string $subject
	 * @return string
	 */
	public function replace( $subject ) {
		return strtr( $subject, $this->data );
	}
}