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   1  <?php
   2  /**
   3   * PHPExcel
   4   *
   5   * Copyright (c) 2006 - 2014 PHPExcel
   6   *
   7   * This library is free software; you can redistribute it and/or
   8   * modify it under the terms of the GNU Lesser General Public
   9   * License as published by the Free Software Foundation; either
  10   * version 2.1 of the License, or (at your option) any later version.
  11   *
  12   * This library is distributed in the hope that it will be useful,
  13   * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15   * Lesser General Public License for more details.
  16   *
  17   * You should have received a copy of the GNU Lesser General Public
  18   * License along with this library; if not, write to the Free Software
  19   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  20   *
  21   * @category   PHPExcel
  22   * @package    PHPExcel_Calculation
  23   * @copyright  Copyright (c) 2006 - 2014 PHPExcel (http://www.codeplex.com/PHPExcel)
  24   * @license    http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt    LGPL
  25   * @version    ##VERSION##, ##DATE##
  26   */
  27  
  28  
  29  /**
  30   * PHPExcel_CalcEngine_CyclicReferenceStack
  31   *
  32   * @category    PHPExcel_CalcEngine_CyclicReferenceStack
  33   * @package        PHPExcel_Calculation
  34   * @copyright    Copyright (c) 2006 - 2014 PHPExcel (http://www.codeplex.com/PHPExcel)
  35   */
  36  class PHPExcel_CalcEngine_CyclicReferenceStack {
  37  
  38      /**
  39       *  The call stack for calculated cells
  40       *
  41       *  @var mixed[]
  42       */
  43      private $_stack = array();
  44  
  45  
  46      /**
  47       * Return the number of entries on the stack
  48       *
  49       * @return  integer
  50       */
  51  	public function count() {
  52          return count($this->_stack);
  53      }
  54  
  55      /**
  56       * Push a new entry onto the stack
  57       *
  58       * @param  mixed  $value
  59       */
  60  	public function push($value) {
  61          $this->_stack[] = $value;
  62      }    //    function push()
  63  
  64      /**
  65       * Pop the last entry from the stack
  66       *
  67       * @return  mixed
  68       */
  69  	public function pop() {
  70          return array_pop($this->_stack);
  71      }    //    function pop()
  72  
  73      /**
  74       * Test to see if a specified entry exists on the stack
  75       *
  76       * @param  mixed  $value  The value to test
  77       */
  78  	public function onStack($value) {
  79          return in_array($value, $this->_stack);
  80      }
  81  
  82      /**
  83       * Clear the stack
  84       */
  85  	public function clear() {
  86          $this->_stack = array();
  87      }    //    function push()
  88  
  89      /**
  90       * Return an array of all entries on the stack
  91       *
  92       * @return  mixed[]
  93       */
  94  	public function showStack() {
  95          return $this->_stack;
  96      }
  97  
  98  }    //    class PHPExcel_CalcEngine_CyclicReferenceStack