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<?php |
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declare(strict_types=1); |
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namespace AlecRabbit\Accessories; |
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/** |
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* Class Rewindable |
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*/ |
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class Rewindable implements \Iterator |
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{ |
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/** @var callable */ |
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private $generatorFunction; |
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/** @var \Generator */ |
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private $generator; |
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/** @var null|callable */ |
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private $onRewind; |
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/** @var array */ |
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private $args; |
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/** |
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* Rewindable constructor. |
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* @param callable $generatorFunction |
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* @param mixed ...$args |
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*/ |
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public function __construct(callable $generatorFunction, ...$args) |
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{ |
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$this->generatorFunction = $generatorFunction; |
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$this->args = $args; |
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$this->createGenerator(...$args); |
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} |
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/** |
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* @param mixed ...$args |
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*/ |
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private function createGenerator(...$args): void |
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{ |
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$this->generator = \call_user_func($this->generatorFunction, ...$args); |
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if (!($this->generator instanceof \Generator)) { |
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throw new \InvalidArgumentException('Return type of your generator function MUST be a \Generator.'); |
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} |
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} |
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/** |
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* @param callable $onRewind |
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* @return Rewindable |
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*/ |
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public function setOnRewind(callable $onRewind): Rewindable |
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{ |
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if (null !== $this->onRewind) { |
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throw new \InvalidArgumentException('onRewind handler can be set only once.'); |
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} |
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$this->onRewind = $onRewind; |
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return $this; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function current() |
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{ |
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return |
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$this->generator->current(); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function next(): void |
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{ |
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$this->generator->next(); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function key() |
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{ |
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return $this->generator->key(); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function valid(): bool |
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{ |
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return $this->generator->valid(); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function rewind(): void |
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{ |
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$this->createGenerator(...$this->args); |
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if ($this->onRewind) { |
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\call_user_func($this->onRewind); |
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} |
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} |
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/** |
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* @param int $start |
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* @param int $stop |
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* @param int|float $step |
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* @return Rewindable |
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*/ |
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public static function range(int $start, int $stop, $step = 1): Rewindable |
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{ |
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return |
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new Rewindable([G::class, 'range'], $start, $stop, $step); |
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} |
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} |
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alecrabbit /
php-accessories
