ThinkPHP/Library/Org/Util/PHPExcel/CalcEngine/Logger.php

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<?php

/**
 * PHPExcel_CalcEngine_Logger
 *
 * 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_CalcEngine_Logger
{
    /**
     * Flag to determine whether a debug log should be generated by the calculation engine
     *        If true, then a debug log will be generated
     *        If false, then a debug log will not be generated
     *
     * @var boolean
     */
    private $writeDebugLog = false;

    /**
     * Flag to determine whether a debug log should be echoed by the calculation engine
     *        If true, then a debug log will be echoed
     *        If false, then a debug log will not be echoed
     * A debug log can only be echoed if it is generated
     *
     * @var boolean
     */
    private $echoDebugLog = false;

    /**
     * The debug log generated by the calculation engine
     *
     * @var string[]
     */
    private $debugLog = array();

    /**
     * The calculation engine cell reference stack
     *
     * @var PHPExcel_CalcEngine_CyclicReferenceStack
     */