|
1
|
|
|
<?php |
|
2
|
|
|
|
|
3
|
|
|
namespace drupol\phpermutations\Iterators; |
|
4
|
|
|
|
|
5
|
|
|
use drupol\phpermutations\Combinatorics; |
|
6
|
|
|
|
|
7
|
|
|
/** |
|
8
|
|
|
* Class Shift. |
|
9
|
|
|
*/ |
|
10
|
|
|
class Shift extends Combinatorics implements \Iterator, \Countable |
|
11
|
|
|
{ |
|
12
|
|
|
/** |
|
13
|
|
|
* The key. |
|
14
|
|
|
* |
|
15
|
|
|
* @var int |
|
16
|
|
|
*/ |
|
17
|
|
|
protected $key = 0; |
|
18
|
|
|
|
|
19
|
|
|
/** |
|
20
|
|
|
* A copy of the dataset at a give time. |
|
21
|
|
|
* |
|
22
|
|
|
* @var array |
|
23
|
|
|
*/ |
|
24
|
|
|
protected $current; |
|
25
|
|
|
|
|
26
|
|
|
/** |
|
27
|
|
|
* Shift constructor. |
|
28
|
|
|
* |
|
29
|
|
|
* @param array $dataset |
|
30
|
|
|
* The dataset |
|
31
|
|
|
* @param int $length |
|
32
|
|
|
* The shift length |
|
33
|
|
|
*/ |
|
34
|
8 |
|
public function __construct(array $dataset = [], $length = 1) |
|
35
|
|
|
{ |
|
36
|
8 |
|
parent::__construct($dataset, $length); |
|
37
|
8 |
|
$this->current = $this->getDataset(); |
|
38
|
8 |
|
} |
|
39
|
|
|
|
|
40
|
|
|
/** |
|
41
|
|
|
* {@inheritdoc} |
|
42
|
|
|
*/ |
|
43
|
8 |
View Code Duplication |
public function setLength($length = null) |
|
|
|
|
|
|
44
|
|
|
{ |
|
45
|
8 |
|
$length = is_null($length) ? $this->datasetCount : $length; |
|
|
|
|
|
|
46
|
8 |
|
$this->length = (abs($length) > $this->datasetCount) ? $this->datasetCount : $length; |
|
47
|
|
|
|
|
48
|
8 |
|
return $this; |
|
49
|
|
|
} |
|
50
|
|
|
|
|
51
|
|
|
/** |
|
52
|
|
|
* {@inheritdoc} |
|
53
|
|
|
*/ |
|
54
|
|
|
public function key() |
|
55
|
|
|
{ |
|
56
|
|
|
return $this->key; |
|
57
|
|
|
} |
|
58
|
|
|
|
|
59
|
|
|
/** |
|
60
|
|
|
* {@inheritdoc} |
|
61
|
|
|
*/ |
|
62
|
4 |
|
public function current() |
|
63
|
|
|
{ |
|
64
|
4 |
|
return $this->current; |
|
65
|
|
|
} |
|
66
|
|
|
|
|
67
|
|
|
/** |
|
68
|
|
|
* {@inheritdoc} |
|
69
|
|
|
*/ |
|
70
|
4 |
View Code Duplication |
public function next() |
|
|
|
|
|
|
71
|
|
|
{ |
|
72
|
4 |
|
$length = $this->getLength(); |
|
73
|
4 |
|
$parameters = []; |
|
74
|
|
|
|
|
75
|
4 |
|
if ($length < 0) { |
|
76
|
|
|
$parameters[] = ['start' => abs($length), 'end' => null]; |
|
77
|
|
|
$parameters[] = ['start' => 0, 'end' => abs($length)]; |
|
78
|
|
|
} else { |
|
79
|
4 |
|
$parameters[] = ['start' => -1 * $length, 'end' => null]; |
|
80
|
4 |
|
$parameters[] = ['start' => 0, 'end' => $this->datasetCount + $length * -1]; |
|
81
|
|
|
} |
|
82
|
|
|
|
|
83
|
4 |
|
$this->current = array_merge( |
|
84
|
4 |
|
array_slice($this->current, $parameters[0]['start'], $parameters[0]['end']), |
|
85
|
4 |
|
array_slice($this->current, $parameters[1]['start'], $parameters[1]['end']) |
|
86
|
4 |
|
); |
|
87
|
4 |
|
} |
|
88
|
|
|
|
|
89
|
|
|
/** |
|
90
|
|
|
* {@inheritdoc} |
|
91
|
|
|
*/ |
|
92
|
|
View Code Duplication |
public function rewind() |
|
|
|
|
|
|
93
|
|
|
{ |
|
94
|
|
|
$length = -1 * $this->getLength(); |
|
95
|
|
|
$parameters = []; |
|
96
|
|
|
|
|
97
|
|
|
if ($length < 0) { |
|
98
|
|
|
$parameters[] = ['start' => abs($length), 'end' => null]; |
|
99
|
|
|
$parameters[] = ['start' => 0, 'end' => abs($length)]; |
|
100
|
|
|
} else { |
|
101
|
|
|
$parameters[] = ['start' => -1 * $length, 'end' => null]; |
|
102
|
|
|
$parameters[] = ['start' => 0, 'end' => $this->datasetCount + $length * -1]; |
|
103
|
|
|
} |
|
104
|
|
|
|
|
105
|
|
|
$this->current = array_merge( |
|
106
|
|
|
array_slice($this->current, $parameters[0]['start'], $parameters[0]['end']), |
|
107
|
|
|
array_slice($this->current, $parameters[1]['start'], $parameters[1]['end']) |
|
108
|
|
|
); |
|
109
|
|
|
} |
|
110
|
|
|
|
|
111
|
|
|
/** |
|
112
|
|
|
* {@inheritdoc} |
|
113
|
|
|
*/ |
|
114
|
|
|
public function valid() |
|
115
|
|
|
{ |
|
116
|
|
|
return true; |
|
117
|
|
|
} |
|
118
|
|
|
|
|
119
|
|
|
/** |
|
120
|
|
|
* {@inheritdoc} |
|
121
|
|
|
*/ |
|
122
|
8 |
|
public function count() |
|
123
|
|
|
{ |
|
124
|
8 |
|
return count($this->getDataset()); |
|
125
|
|
|
} |
|
126
|
|
|
} |
|
127
|
|
|
|
drupol /
phpermutations
Loading history...
Duplicated code is one of the most pungent code smells. If you need to duplicate the same code in three or more different places, we strongly encourage you to look into extracting the code into a single class or operation.
You can also find more detailed suggestions in the “Code” section of your repository.