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<?php declare(strict_types=1); /* * This file is part of the league/commonmark package. * * (c) Colin O'Dell <colinodell@gmail.com> * * For the full copyright and license information, please view the LICENSE * file that was distributed with this source code. */ namespace League\CommonMark\Util; /** * Array collection * * Provides a wrapper around a standard PHP array. * * @internal * * @phpstan-template T * @phpstan-implements \IteratorAggregate<int, T> * @phpstan-implements \ArrayAccess<int, T> */ final class ArrayCollection implements \IteratorAggregate, \Countable, \ArrayAccess { /** * @var array<int, mixed> * @phpstan-var array<int, T> */ private array $elements; /** * Constructor * * @param array<int|string, mixed> $elements * * @phpstan-param array<int, T> $elements */ public function __construct(array $elements = []) { $this->elements = $elements; } /** * @return mixed|false * * @phpstan-return T|false */ public function first() { return \reset($this->elements); } /** * @return mixed|false * * @phpstan-return T|false */ public function last() { return \end($this->elements); } /** * Retrieve an external iterator * * @return \ArrayIterator<int, mixed> * * @phpstan-return \ArrayIterator<int, T> */ #[\ReturnTypeWillChange] public function getIterator(): \ArrayIterator { return new \ArrayIterator($this->elements); } /** * Count elements of an object * * @return int The count as an integer. */ public function count(): int { return \count($this->elements); } /** * Whether an offset exists * * {@inheritDoc} * * @phpstan-param int $offset */ public function offsetExists($offset): bool { return \array_key_exists($offset, $this->elements); } /** * Offset to retrieve * * {@inheritDoc} * * @phpstan-param int $offset * * @phpstan-return T|null */ #[\ReturnTypeWillChange] public function offsetGet($offset) { return $this->elements[$offset] ?? null; } /** * Offset to set * * {@inheritDoc} * * @phpstan-param int|null $offset * @phpstan-param T $value */ #[\ReturnTypeWillChange] public function offsetSet($offset, $value): void { if ($offset === null) { $this->elements[] = $value; } else { $this->elements[$offset] = $value; } } /** * Offset to unset * * {@inheritDoc} * * @phpstan-param int $offset */ #[\ReturnTypeWillChange] public function offsetUnset($offset): void { if (! \array_key_exists($offset, $this->elements)) { return; } unset($this->elements[$offset]); } /** * Returns a subset of the array * * @return array<int, mixed> * * @phpstan-return array<int, T> */ public function slice(int $offset, ?int $length = null): array { return \array_slice($this->elements, $offset, $length, true); } /** * @return array<int, mixed> * * @phpstan-return array<int, T> */ public function toArray(): array { return $this->elements; } }