Stack.php
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<?php
/**
* PHPExcel
*
* Copyright (c) 2006 - 2014 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 - 2014 PHPExcel (http://www.codeplex.com/PHPExcel)
* @license http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt LGPL
* @version ##VERSION##, ##DATE##
*/
/**
* PHPExcel_Calculation_Token_Stack
*
* @category PHPExcel_Calculation_Token_Stack
* @package PHPExcel_Calculation
* @copyright Copyright (c) 2006 - 2014 PHPExcel (http://www.codeplex.com/PHPExcel)
*/
class PHPExcel_Calculation_Token_Stack {
/**
* The parser stack for formulae
*
* @var mixed[]
*/
private $_stack = array();
/**
* Count of entries in the parser stack
*
* @var integer
*/
private $_count = 0;
/**
* Return the number of entries on the stack
*
* @return integer
*/
public function count() {
return $this->_count;
} // function count()
/**
* Push a new entry onto the stack
*
* @param mixed $type
* @param mixed $value
* @param mixed $reference
*/
public function push($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'] = $localeFunction;
}
}
} // function push()
/**
* Pop the last entry from the stack
*
* @return mixed
*/
public function pop() {
if ($this->_count > 0) {
return $this->_stack[--$this->_count];
}
return NULL;
} // function pop()
/**
* Return an entry from the stack without removing it
*
* @param integer $n number indicating how far back in the stack we want to look
* @return mixed
*/
public function last($n = 1) {
if ($this->_count - $n < 0) {
return NULL;
}
return $this->_stack[$this->_count - $n];
} // function last()
/**
* Clear the stack
*/
function clear() {
$this->_stack = array();
$this->_count = 0;
}
} // class PHPExcel_Calculation_Token_Stack