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<?php
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/**
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 * PHPExcel
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 *
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 * Copyright (c) 2006 - 2013 PHPExcel
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 *
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 * This library is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * This library is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with this library; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
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 *
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 * @category   PHPExcel
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 * @package    PHPExcel_Calculation
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 * @copyright  Copyright (c) 2006 - 2013 PHPExcel (http://www.codeplex.com/PHPExcel)
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 * @license	http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt	LGPL
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 * @version	##VERSION##, ##DATE##
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 */
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/**
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 * PHPExcel_CalcEngine_CyclicReferenceStack
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 *
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 * @category	PHPExcel_CalcEngine_CyclicReferenceStack
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 * @package		PHPExcel_Calculation
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 * @copyright	Copyright (c) 2006 - 2013 PHPExcel (http://www.codeplex.com/PHPExcel)
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 */
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class PHPExcel_CalcEngine_CyclicReferenceStack {
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	/**
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	 *  The call stack for calculated cells
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	 *
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	 *  @var mixed[]
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	 */
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	private $_stack = array();
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	/**
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	 * Return the number of entries on the stack
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	 *
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	 * @return  integer
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	 */
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	public function count() {
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		return count($this->_stack);
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	}
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	/**
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	 * Push a new entry onto the stack
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	 *
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	 * @param  mixed  $value
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	 */
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	public function push($value) {
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		$this->_stack[] = $value;
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	}	//	function push()
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	/**
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	 * Pop the last entry from the stack
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	 *
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	 * @return  mixed
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	 */
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	public function pop() {
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		return array_pop($this->_stack);
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	}	//	function pop()
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	/**
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	 * Test to see if a specified entry exists on the stack
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	 *
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	 * @param  mixed  $value  The value to test
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	 */
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	public function onStack($value) {
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		return in_array($value, $this->_stack);
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	}
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	/**
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	 * Clear the stack
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	 */
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	public function clear() {
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		$this->_stack = array();
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	}	//	function push()
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	/**
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	 * Return an array of all entries on the stack
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	 *
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	 * @return  mixed[]
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	 */
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	public function showStack() {
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		return $this->_stack;
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	}
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}	//	class PHPExcel_CalcEngine_CyclicReferenceStack