ThinkPHP/Library/Org/Util/PHPExcel/ReferenceHelper.php

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<?php

/**
 * PHPExcel_ReferenceHelper (Singleton)
 *
 * 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
 * @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_ReferenceHelper
{
    /**    Constants                */
    /**    Regular Expressions      */
    const REFHELPER_REGEXP_CELLREF      = '((\w*|\'[^!]*\')!)?(?<![:a-z\$])(\$?[a-z]{1,3}\$?\d+)(?=[^:!\d\'])';
    const REFHELPER_REGEXP_CELLRANGE    = '((\w*|\'[^!]*\')!)?(\$?[a-z]{1,3}\$?\d+):(\$?[a-z]{1,3}\$?\d+)';
    const REFHELPER_REGEXP_ROWRANGE     = '((\w*|\'[^!]*\')!)?(\$?\d+):(\$?\d+)';
    const REFHELPER_REGEXP_COLRANGE     = '((\w*|\'[^!]*\')!)?(\$?[a-z]{1,3}):(\$?[a-z]{1,3})';

    /**
     * Instance of this class
     *
     * @var PHPExcel_ReferenceHelper
     */
    private static $instance;

    /**
     * Get an instance of this class
     *
     * @return PHPExcel_ReferenceHelper
     */
    public static function getInstance()
    {
        if (!isset(self::$instance) || (self::$instance === null)) {
            self::$instance = new PHPExcel_ReferenceHelper();
        }

        return self::$instance;
    }

    /**
     * Create a new PHPExcel_ReferenceHelper
     */