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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_Calculation_Token_Stack
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 *
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 * @category	PHPExcel_Calculation_Token_Stack
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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_Calculation_Token_Stack {
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	/**
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	 *  The parser stack for formulae
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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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	 *  Count of entries in the parser stack
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	 *
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	 *  @var integer
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	 */
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	private $_count = 0;
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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 $this->_count;
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	}	//	function count()
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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  $type
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	 * @param  mixed  $value
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	 * @param  mixed  $reference
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	 */
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	public function push($type, $value, $reference = NULL) {
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		$this->_stack[$this->_count++] = array('type'		=> $type,
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											   'value'		=> $value,
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											   'reference'	=> $reference
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											  );
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		if ($type == 'Function') {
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			$localeFunction = PHPExcel_Calculation::_localeFunc($value);
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			if ($localeFunction != $value) {
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				$this->_stack[($this->_count - 1)]['localeValue'] = $localeFunction;
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			}
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		}
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	}	//	function push()
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	/**
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	 * Pop the last entry from the stack
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	 *
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	 * @return  mixed
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	 */
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	public function pop() {
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		if ($this->_count > 0) {
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			return $this->_stack[--$this->_count];
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		}
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		return NULL;
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	}	//	function pop()
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	/**
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	 * Return an entry from the stack without removing it
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	 *
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	 * @param   integer  $n  number indicating how far back in the stack we want to look
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	 * @return  mixed
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	 */
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	public function last($n = 1) {
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		if ($this->_count - $n < 0) {
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			return NULL;
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		}
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		return $this->_stack[$this->_count - $n];
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	}	//	function last()
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	/**
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	 * Clear the stack
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	 */
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	function clear() {
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		$this->_stack = array();
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		$this->_count = 0;
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	}
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}	//	class PHPExcel_Calculation_Token_Stack