CyclicReferenceStack.php
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<?php
/**
* PHPExcel_CalcEngine_CyclicReferenceStack
*
* 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_CalcEngine_CyclicReferenceStack
{
/**
* The call stack for calculated cells
*
* @var mixed[]
*/
private $stack = array();
/**
* Return the number of entries on the stack
*
* @return integer
*/
public function count()
{
return count($this->stack);
}
/**
* Push a new entry onto the stack
*
* @param mixed $value
*/
public function push($value)
{
$this->stack[$value] = $value;
}
/**
* Pop the last entry from the stack
*
* @return mixed
*/
public function pop()
{
return array_pop($this->stack);
}
/**
* Test to see if a specified entry exists on the stack
*
* @param mixed $value The value to test
*/
public function onStack($value)
{
return isset($this->stack[$value]);
}
/**
* Clear the stack
*/
public function clear()
{
$this->stack = array();
}
/**
* Return an array of all entries on the stack
*
* @return mixed[]
*/
public function showStack()
{
return $this->stack;
}
}