3886c47ebe
Refactoring of calculation engine for improved performance and memory usage Refactoring of cell object to eliminate data duplication and reduce memory
76 lines
2.0 KiB
PHP
76 lines
2.0 KiB
PHP
<?php
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/**
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* PHPExcel
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*
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* Copyright (c) 2006 - 2012 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 - 2012 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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class PHPExcel_Calculation_Token_Stack {
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private $_stack = array();
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private $_count = 0;
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public function count() {
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return $this->_count;
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} // function count()
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public function push($type,$value,$reference=null) {
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$this->_stack[$this->_count++] = array('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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$localeFunction = PHPExcel_Calculation::_localeFunc($value);
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if ($localeFunction != $value) {
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$this->_stack[($this->_count - 1)]['localeValue'] = $localeFunction;
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}
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}
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} // function push()
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public function pop() {
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if ($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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} // function pop()
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public function last($n=1) {
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if ($this->_count-$n < 0) {
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return null;
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}
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return $this->_stack[$this->_count-$n];
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} // function last()
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function clear() {
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$this->_stack = array();
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$this->_count = 0;
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}
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} // class PHPExcel_Calculation_Token_Stack
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