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<?php namespace PhpOffice\PhpSpreadsheet\CalcEngine; /** * Copyright (c) 2006 - 2016 PhpSpreadsheet. * * 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 PhpSpreadsheet * * @copyright Copyright (c) 2006 - 2016 PhpSpreadsheet (https://github.com/PHPOffice/PhpSpreadsheet) * @license http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt LGPL */ class CyclicReferenceStack { /** * The call stack for calculated cells. * * @var mixed[] */ private $stack = []; /** * Return the number of entries on the stack. * * @return int */ public function count() { return count($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 = []; } /** * Return an array of all entries on the stack. * * @return mixed[] */ public function showStack() { return $this->stack; } }
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