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<?php
/**
* PHPExcel_Calculation_Token_Stack
*
* Copyright (c) 2006 - 2015 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 - 2015 PHPExcel (http://www.codeplex.com/PHPExcel)
* @license http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt LGPL
* @version ##VERSION##, ##DATE##
*/
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;
}
/**
* 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'] = $localeFunction;
}
}
}
/**
* Pop the last entry from the stack
*
* @return mixed
*/
public function pop()
{
if ($this->count > 0) {
return $this->stack[--$this->count];
}
return null;
}
/**
* 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];
}
/**
* Clear the stack
*/
public function clear()
{
$this->stack = array();
$this->count = 0;
}
}
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