visualizer / vendor / phpoffice / phpexcel / Classes / PHPExcel / Calculation / Token / Stack.php

Stack.php in Visualizer – Tables & Charts Manager with Built-in AI Generator 3.0.3, at vendor/phpoffice/phpexcel/Classes/PHPExcel/Calculation/Token/Stack.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_Calculation_Token_Stack
31	*
32	* @category PHPExcel_Calculation_Token_Stack
33	* @package PHPExcel_Calculation
34	* @copyright Copyright (c) 2006 - 2014 PHPExcel (http://www.codeplex.com/PHPExcel)
35	*/
36	class PHPExcel_Calculation_Token_Stack {
37
38	/**
39	* The parser stack for formulae
40	*
41	* @var mixed[]
42	*/
43	private $_stack = array();
44
45	/**
46	* Count of entries in the parser stack
47	*
48	* @var integer
49	*/
50	private $_count = 0;
51
52
53	/**
54	* Return the number of entries on the stack
55	*
56	* @return integer
57	*/
58	public function count() {
59	return $this->_count;
60	} // function count()
61
62	/**
63	* Push a new entry onto the stack
64	*
65	* @param mixed $type
66	* @param mixed $value
67	* @param mixed $reference
68	*/
69	public function push($type, $value, $reference = NULL) {
70	$this->_stack[$this->_count++] = array('type' => $type,
71	'value' => $value,
72	'reference' => $reference
73	);
74	if ($type == 'Function') {
75	$localeFunction = PHPExcel_Calculation::_localeFunc($value);
76	if ($localeFunction != $value) {
77	$this->_stack[($this->_count - 1)]['localeValue'] = $localeFunction;
78	}
79	}
80	} // function push()
81
82	/**
83	* Pop the last entry from the stack
84	*
85	* @return mixed
86	*/
87	public function pop() {
88	if ($this->_count > 0) {
89	return $this->_stack[--$this->_count];
90	}
91	return NULL;
92	} // function pop()
93
94	/**
95	* Return an entry from the stack without removing it
96	*
97	* @param integer $n number indicating how far back in the stack we want to look
98	* @return mixed
99	*/
100	public function last($n = 1) {
101	if ($this->_count - $n < 0) {
102	return NULL;
103	}
104	return $this->_stack[$this->_count - $n];
105	} // function last()
106
107	/**
108	* Clear the stack
109	*/
110	function clear() {
111	$this->_stack = array();
112	$this->_count = 0;
113	}
114
115	} // class PHPExcel_Calculation_Token_Stack
116