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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
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