visualizer / vendor / phpoffice / phpexcel / Classes / PHPExcel / CalcEngine / CyclicReferenceStack.php

CyclicReferenceStack.php in Visualizer – Tables & Charts Manager with Built-in AI Generator 3.0.3, at vendor/phpoffice/phpexcel/Classes/PHPExcel/CalcEngine/CyclicReferenceStack.php

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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] = $value;
62	}
63
64	/**
65	* Pop the last entry from the stack
66	*
67	* @return mixed
68	*/
69	public function pop() {
70	return array_pop($this->_stack);
71	}
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 isset($this->_stack[$value]);
80	}
81
82	/**
83	* Clear the stack
84	*/
85	public function clear() {
86	$this->_stack = array();
87	}
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	}
99