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