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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;
}
}
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