File Source for Stack.php

<?php
/**
* PHPExcel
*
* Copyright (c) 2006 - 2012 PHPExcel
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* @category PHPExcel
* @package PHPExcel_Calculation
* @copyright Copyright (c) 2006 - 2012 PHPExcel (http://www.codeplex.com/PHPExcel)
* @license http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt LGPL
* @version 1.7.8, 2012-10-12
*/
class PHPExcel_Calculation_Token_Stack {
private $_stack = array();
private $_count = 0;
public function count() {
return $this->_count;
} // function count()
public function push($type,$value,$reference=null) {
$this->_stack[$this->_count++] = array('type' => $type,
'value' => $value,
'reference' => $reference
);
if ($type == 'Function') {
$localeFunction = PHPExcel_Calculation::_localeFunc($value);
if ($localeFunction != $value) {
$this->_stack[($this->_count - 1)]['localeValue'] = $localeFunction;
}
}
} // function push()
public function pop() {
if ($this->_count > 0) {
return $this->_stack[--$this->_count];
}
return null;
} // function pop()
public function last($n=1) {
if ($this->_count-$n < 0) {
return null;
}
return $this->_stack[$this->_count-$n];
} // function last()
function __construct() {
}
} // class PHPExcel_Calculation_Token_Stack

Source for file Stack.php