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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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