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<?php |
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declare(strict_types=1); |
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namespace Cunningsoft\GenericList; |
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use ArrayIterator; |
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use InvalidArgumentException; |
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use IteratorAggregate; |
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use function array_filter; |
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use function array_map; |
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use function array_merge; |
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use function array_slice; |
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use function array_walk; |
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use function count; |
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use function get_class; |
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use function gettype; |
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use function is_object; |
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use function sprintf; |
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/** |
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* @template T |
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*/ |
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abstract class GenericList implements IteratorAggregate |
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{ |
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/** |
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* @var string |
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* @psalm-var class-string<T> |
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*/ |
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private $type; |
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/** |
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* @var mixed[] |
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* @psalm-var array<int, T> |
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*/ |
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protected $elements = []; |
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/** |
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* @param mixed[] $elements |
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* |
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* @psalm-param class-string<T> $type |
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* @psalm-param iterable<T> $elements |
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*/ |
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public function __construct(string $type, iterable $elements = []) |
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{ |
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$this->type = $type; |
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foreach ($elements as $element) { |
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if (!$element instanceof $type) { |
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throw new InvalidArgumentException(sprintf( |
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'Expected a %s, but got: %s.', |
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$type, |
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is_object($element) ? get_class($element) : gettype($element), |
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)); |
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} |
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$this->elements[] = $element; |
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} |
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} |
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public function count(): int |
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{ |
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return count($this->elements); |
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} |
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public function isEmpty(): bool |
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{ |
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return $this->count() === 0; |
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} |
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public function isNotEmpty(): bool |
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{ |
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return !$this->isEmpty(); |
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} |
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public function filter(callable $callback): self |
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{ |
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return new static($this->type, array_filter($this->elements, $callback)); |
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} |
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/** @return mixed[] */ |
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public function map(callable $callback): array |
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{ |
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return array_map($callback, $this->elements); |
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} |
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public function walk(callable $callback): bool |
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{ |
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return array_walk($this->elements, $callback); |
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} |
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public function merge(self $other): self |
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{ |
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return new static($this->type, array_merge($this->elements, $other->elements)); |
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} |
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public function slice(int $offset, ?int $length = null): self |
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{ |
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return new static($this->type, array_slice($this->elements, $offset, $length)); |
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} |
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/** |
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* @return mixed |
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* |
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* @psalm-return T |
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*/ |
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public function only() |
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{ |
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4 |
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if ($this->isEmpty()) { |
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1 |
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throw new NoElements(); |
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} |
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if ($this->count() > 1) { |
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throw new ElementsAreNotUnique(); |
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} |
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return $this->elements[0]; |
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} |
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public function getIterator(): ArrayIterator |
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{ |
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return new ArrayIterator($this->elements); |
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} |
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} |
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cunningsoft /
generic-list
