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ZipIterator
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1<?php
2
3declare(strict_types=1);
4
5namespace PeServer\Core\Collection;
6
7use Iterator;
8use PeServer\Core\Throws\ArgumentException;
9use PeServer\Core\Throws\CallbackTypeError;
10
11/**
12 * zip イテレータ。
13 *
14 * @template TKey of array-key
15 * @template TValue1
16 * @template TValue2
17 * @template TResult
18 * @implements Iterator<TKey,TResult>
19 */
20class ZipIterator implements Iterator
21{
22    #region variable
23
24    /**
25     * @var Iterator[]
26     */
27    private array $iterators;
28
29    #endregion
30
31    /**
32     * 生成。
33     *
34     * @param Iterator $first
35     * @phpstan-param Iterator<TKey,TValue1> $first
36     * @param Iterator $second
37     * @phpstan-param Iterator<array-key,TValue2> $second
38     * @param mixed $callback
39     * @phpstan-param callable(array{0:TValue1,1:TValue2},TKey):(TResult) $callback
40     */
41    public function __construct(Iterator $first, Iterator $second, private mixed $callback)
42    {
43        if (!is_callable($callback)) { //@phpstan-ignore-line phpstan-param callable
44            throw new CallbackTypeError('$callback');
45        }
46
47        $this->iterators = [
48            $first,
49            $second,
50        ];
51    }
52
53    #region Iterator
54
55    public function rewind(): void
56    {
57        foreach ($this->iterators as $iterator) {
58            $iterator->rewind();
59        }
60    }
61
62    public function key(): mixed
63    {
64        return $this->iterators[0]->key();
65    }
66
67    public function current(): mixed
68    {
69        $items = array_map(fn ($i) => $i->current(), $this->iterators);
70        //@phpstan-ignore-next-line TValue1, TValue2
71        return call_user_func($this->callback, $items, $this->key());
72    }
73
74    public function next(): void
75    {
76        foreach ($this->iterators as $iterator) {
77            $iterator->next();
78        }
79    }
80
81    public function valid(): bool
82    {
83        foreach ($this->iterators as $iterator) {
84            if (!$iterator->valid()) {
85                return false;
86            }
87        }
88
89        return true;
90    }
91
92    #endregion
93}