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1<?php
2
3declare(strict_types=1);
4
5namespace Cosray\Schema;
6
7use Attribute;
8use Cosray\Exception\RuntimeException;
9
10/**
11 * The node types allowed as direct children. `sortable` gives the children
12 * a manual order: editors arrange them in the panel, and `children()`
13 * returns them in that order.
14 */
15#[Attribute(Attribute::TARGET_CLASS)]
16readonly class Children
17{
18    /** @var list<class-string> */
19    public array $types;
20
21    /** @param class-string|list<class-string> $types */
22    public function __construct(
23        string|array $types,
24        public bool $sortable = false,
25    ) {
26        $types = is_string($types) ? [$types] : array_values($types);
27
28        foreach ($types as $type) {
29            if (!is_string($type) || trim($type) === '') {
30                throw new RuntimeException('#[Children] needs non-empty class names');
31            }
32        }
33
34        $this->types = $types;
35    }
36}