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<?php |
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namespace PhpOffice\PhpSpreadsheet\Calculation\Token; |
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/** |
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* Copyright (c) 2006 - 2016 PhpSpreadsheet. |
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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 PhpSpreadsheet |
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* |
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* @copyright Copyright (c) 2006 - 2016 PhpSpreadsheet (https://github.com/PHPOffice/PhpSpreadsheet) |
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* @license http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt LGPL |
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*/ |
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class Stack |
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{ |
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/** |
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* The parser stack for formulae. |
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* |
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* @var mixed[] |
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*/ |
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private $stack = []; |
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/** |
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* Count of entries in the parser stack. |
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* |
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* @var int |
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*/ |
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private $count = 0; |
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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 int |
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*/ |
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public function count() |
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{ |
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return $this->count; |
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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 $type |
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* @param mixed $value |
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* @param mixed $reference |
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*/ |
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public function push($type, $value, $reference = null) |
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{ |
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$this->stack[$this->count++] = [ |
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'type' => $type, |
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'value' => $value, |
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'reference' => $reference, |
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]; |
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if ($type == 'Function') { |
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$localeFunction = \PhpOffice\PhpSpreadsheet\Calculation::localeFunc($value); |
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if ($localeFunction != $value) { |
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1 |
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$this->stack[($this->count - 1)]['localeValue'] = $localeFunction; |
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} |
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} |
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} |
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/** |
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* Pop the last entry from the stack. |
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* |
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* @return mixed |
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*/ |
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public function pop() |
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{ |
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if ($this->count > 0) { |
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return $this->stack[--$this->count]; |
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} |
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return null; |
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} |
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/** |
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* Return an entry from the stack without removing it. |
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* |
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* @param int $n number indicating how far back in the stack we want to look |
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* |
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* @return mixed |
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*/ |
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public function last($n = 1) |
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{ |
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if ($this->count - $n < 0) { |
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return null; |
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} |
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return $this->stack[$this->count - $n]; |
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} |
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/** |
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* Clear the stack. |
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*/ |
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public function clear() |
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{ |
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$this->stack = []; |
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$this->count = 0; |
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} |
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} |
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PHPOffice /
PhpSpreadsheet
