|
1
|
|
|
<?php |
|
2
|
|
|
/** |
|
3
|
|
|
* @author Maxim Sokolovsky |
|
4
|
|
|
*/ |
|
5
|
|
|
|
|
6
|
|
|
namespace WS\Utils\Collections\Functions; |
|
7
|
|
|
|
|
8
|
|
|
use Closure; |
|
9
|
|
|
use WS\Utils\Collections\ArrayList; |
|
10
|
|
|
use WS\Utils\Collections\Collection; |
|
11
|
|
|
|
|
12
|
|
|
class Reorganizers |
|
13
|
|
|
{ |
|
14
|
17 |
|
private static function collectionConstructor(? array $elements = null): Collection { |
|
15
|
17 |
|
return new ArrayList($elements); |
|
16
|
|
|
} |
|
17
|
|
|
|
|
18
|
|
|
/** |
|
19
|
|
|
* Returns <Fn($c: Collection): Collection> that shuffles elements |
|
20
|
|
|
* @return Closure |
|
21
|
|
|
*/ |
|
22
|
5 |
|
public static function shuffle(): Closure |
|
23
|
|
|
{ |
|
24
|
|
|
return static function (Collection $collection): Collection { |
|
25
|
5 |
|
$array = $collection->toArray(); |
|
26
|
5 |
|
shuffle($array); |
|
27
|
|
|
|
|
28
|
5 |
|
return self::collectionConstructor($array); |
|
29
|
5 |
|
}; |
|
30
|
|
|
} |
|
31
|
|
|
|
|
32
|
|
|
/** |
|
33
|
|
|
* Returns Closure <Fn($c: Collection): Collection> that gets $count random elements from collection |
|
34
|
|
|
* @param int $count |
|
35
|
|
|
* @return Closure |
|
36
|
|
|
*/ |
|
37
|
10 |
|
public static function random(int $count = 1): Closure |
|
38
|
|
|
{ |
|
39
|
|
|
return static function (Collection $collection) use ($count): Collection { |
|
40
|
|
|
/** |
|
41
|
|
|
* Collection |
|
42
|
|
|
*/ |
|
43
|
10 |
|
$resultCollection = self::collectionConstructor(); |
|
44
|
10 |
|
if ($count === 0) { |
|
45
|
2 |
|
return $resultCollection; |
|
46
|
|
|
} |
|
47
|
|
|
|
|
48
|
8 |
|
$collectionSize = $collection->size(); |
|
49
|
8 |
|
$expectedCount = $count; |
|
50
|
|
|
|
|
51
|
8 |
|
if ($collectionSize < $expectedCount) { |
|
52
|
2 |
|
return $resultCollection; |
|
53
|
|
|
} |
|
54
|
|
|
|
|
55
|
6 |
|
$rest = $collectionSize; |
|
56
|
6 |
|
$generated = 0; |
|
57
|
6 |
|
$multiplicity = (int)round($collectionSize / $expectedCount); |
|
58
|
|
|
|
|
59
|
|
|
$rangeRandomizer = static function () use ($multiplicity): int { |
|
60
|
4 |
|
return random_int(0, $multiplicity - 1); |
|
61
|
6 |
|
}; |
|
62
|
|
|
|
|
63
|
|
|
$trier = static function () use (& $generated, & $rest, $expectedCount, $rangeRandomizer): bool { |
|
64
|
6 |
|
$rest--; |
|
65
|
6 |
|
if ($generated === $expectedCount) { |
|
66
|
4 |
|
return false; |
|
67
|
|
|
} |
|
68
|
6 |
|
if ($generated + $rest + 1 <= $expectedCount) { |
|
69
|
2 |
|
return true; |
|
70
|
|
|
} |
|
71
|
4 |
|
if ($rangeRandomizer() !== 0) { |
|
72
|
|
|
return false; |
|
73
|
|
|
} |
|
74
|
4 |
|
$generated++; |
|
75
|
4 |
|
return true; |
|
76
|
6 |
|
}; |
|
77
|
|
|
|
|
78
|
|
|
return $collection |
|
79
|
6 |
|
->stream() |
|
80
|
6 |
|
->filter($trier) |
|
81
|
6 |
|
->getCollection(); |
|
82
|
10 |
|
}; |
|
83
|
|
|
} |
|
84
|
|
|
|
|
85
|
|
|
/** |
|
86
|
|
|
* Returns Closure <Fn($c: Collection): Collection> that split collection into sub collections with $size |
|
87
|
|
|
* @param int $size |
|
88
|
|
|
* @return Closure |
|
89
|
|
|
*/ |
|
90
|
1 |
|
public static function chunk(int $size): Closure |
|
91
|
|
|
{ |
|
92
|
|
|
return static function (Collection $collection) use ($size): Collection { |
|
93
|
1 |
|
$chunkCollection = self::collectionConstructor(); |
|
94
|
1 |
|
$currentChunk = self::collectionConstructor(); |
|
95
|
1 |
|
$pointer = $size; |
|
96
|
|
|
$collection |
|
97
|
1 |
|
->stream() |
|
98
|
|
|
->each(static function ($el) use ($size, $chunkCollection, & $currentChunk, & $pointer) { |
|
99
|
1 |
|
$pointer--; |
|
100
|
1 |
|
$currentChunk->add($el); |
|
101
|
|
|
|
|
102
|
1 |
|
if ($pointer === 0) { |
|
103
|
1 |
|
$chunkCollection->add($currentChunk); |
|
104
|
1 |
|
$currentChunk = self::collectionConstructor(); |
|
105
|
1 |
|
$pointer = $size; |
|
106
|
|
|
} |
|
107
|
1 |
|
}) |
|
108
|
|
|
; |
|
109
|
1 |
|
return $chunkCollection; |
|
110
|
1 |
|
}; |
|
111
|
|
|
} |
|
112
|
|
|
|
|
113
|
|
|
/** |
|
114
|
|
|
* Returns Closure <Fn($c: Collection): Collection> that collapses a collection of arrays into a single, flat collection |
|
115
|
|
|
* @return Closure |
|
116
|
|
|
*/ |
|
117
|
1 |
|
public static function collapse(): Closure |
|
118
|
|
|
{ |
|
119
|
|
|
return static function (Collection $collection): Collection { |
|
120
|
|
|
$flatIterable = static function (iterable $collection) use (& $flatIterable): array { |
|
121
|
1 |
|
$res = []; |
|
122
|
1 |
|
foreach ($collection as $item) { |
|
123
|
1 |
|
if (is_iterable($item)) { |
|
124
|
1 |
|
$toPush = $flatIterable($item); |
|
125
|
1 |
|
array_unshift($toPush, $res); |
|
126
|
1 |
|
array_push(...$toPush); |
|
127
|
1 |
|
$res = array_shift($toPush); |
|
128
|
|
|
} else { |
|
129
|
1 |
|
$res[] = $item; |
|
130
|
|
|
} |
|
131
|
|
|
} |
|
132
|
1 |
|
return $res; |
|
133
|
1 |
|
}; |
|
134
|
|
|
|
|
135
|
1 |
|
return self::collectionConstructor($flatIterable($collection)); |
|
136
|
1 |
|
}; |
|
137
|
|
|
} |
|
138
|
|
|
} |
|
139
|
|
|
|
worksolutions /
php-collections
