<?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_CalcEngine_CyclicReferenceStack * * @category PHPExcel_CalcEngine_CyclicReferenceStack * @package PHPExcel_Calculation * @copyright Copyright (c) 2006 - 2014 PHPExcel (http://www.codeplex.com/PHPExcel) */ 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[] = $value; } // function push() /** * Pop the last entry from the stack * * @return mixed */ public function pop() { return array_pop($this->_stack); } // function pop() /** * Test to see if a specified entry exists on the stack * * @param mixed $value The value to test */ public function onStack($value) { return in_array($value, $this->_stack); } /** * Clear the stack */ public function clear() { $this->_stack = array(); } // function push() /** * Return an array of all entries on the stack * * @return mixed[] */ public function showStack() { return $this->_stack; } } // class PHPExcel_CalcEngine_CyclicReferenceStack