visualizer / vendor / phpoffice / phpspreadsheet / src / PhpSpreadsheet / Calculation / Token / Stack.php

Stack.php in Visualizer – Tables & Charts Manager with Built-in AI Generator 3.4.7, at vendor/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Calculation/Token/Stack.php

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1	<?php
2
3	namespace PhpOffice\PhpSpreadsheet\Calculation\Token;
4
5	use PhpOffice\PhpSpreadsheet\Calculation\Calculation;
6
7	class Stack
8	{
9	/**
10	* The parser stack for formulae.
11	*
12	* @var mixed[]
13	*/
14	private $stack = [];
15
16	/**
17	* Count of entries in the parser stack.
18	*
19	* @var int
20	*/
21	private $count = 0;
22
23	/**
24	* Return the number of entries on the stack.
25	*
26	* @return int
27	*/
28	public function count()
29	{
30	return $this->count;
31	}
32
33	/**
34	* Push a new entry onto the stack.
35	*
36	* @param mixed $type
37	* @param mixed $value
38	* @param mixed $reference
39	*/
40	public function push($type, $value, $reference = null)
41	{
42	$this->stack[$this->count++] = [
43	'type' => $type,
44	'value' => $value,
45	'reference' => $reference,
46	];
47	if ($type == 'Function') {
48	$localeFunction = Calculation::localeFunc($value);
49	if ($localeFunction != $value) {
50	$this->stack[($this->count - 1)]['localeValue'] = $localeFunction;
51	}
52	}
53	}
54
55	/**
56	* Pop the last entry from the stack.
57	*
58	* @return mixed
59	*/
60	public function pop()
61	{
62	if ($this->count > 0) {
63	return $this->stack[--$this->count];
64	}
65
66	return null;
67	}
68
69	/**
70	* Return an entry from the stack without removing it.
71	*
72	* @param int $n number indicating how far back in the stack we want to look
73	*
74	* @return mixed
75	*/
76	public function last($n = 1)
77	{
78	if ($this->count - $n < 0) {
79	return null;
80	}
81
82	return $this->stack[$this->count - $n];
83	}
84
85	/**
86	* Clear the stack.
87	*/
88	public function clear()
89	{
90	$this->stack = [];
91	$this->count = 0;
92	}
93	}
94