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<?php |
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declare(strict_types=1); |
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namespace AlecRabbit\Accessories; |
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use function AlecRabbit\typeOf; |
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/** |
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* Class Circular |
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*/ |
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class Circular implements \Iterator |
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{ |
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/** @var mixed|Rewindable */ |
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protected $data; |
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/** @var bool */ |
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protected $oneElement = false; |
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/** |
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* Circular constructor. |
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* @param array|callable|Rewindable $data accepts array, callable which returns \Generator or Rewindable |
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*/ |
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public function __construct($data) |
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{ |
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$this->data = $this->refineData($data); |
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} |
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/** |
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* @param mixed $data |
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* @return mixed |
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*/ |
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protected function refineData($data) |
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{ |
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if (\is_array($data)) { |
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if (1 === $count = count($data)) { |
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$this->oneElement = true; |
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return reset($data); |
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} |
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if (0 === $count) { |
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$this->oneElement = true; |
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return null; |
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} |
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} |
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return $this->convert($data); |
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} |
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/** |
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* @param mixed $arg |
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* @return Rewindable |
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*/ |
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protected function convert(&$arg): Rewindable |
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{ |
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if (\is_array($arg)) { |
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return |
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new Rewindable( |
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static function () use (&$arg): \Generator { |
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yield from $arg; |
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} |
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); |
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} |
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if (\is_callable($arg)) { |
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return |
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new Rewindable($arg); |
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} |
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if ($arg instanceof Rewindable) { |
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return $arg; |
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} |
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throw new \InvalidArgumentException('Unexpected argument type: ' . typeOf($arg) . ' for ' . Caller::get()); |
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} |
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/** |
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* @return mixed |
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*/ |
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public function __invoke() |
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{ |
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return $this->value(); |
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} |
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/** |
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* @return mixed |
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*/ |
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public function value() |
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{ |
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if ($this->oneElement) { |
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return $this->data; |
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} |
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if (null === $value = $this->current()) { |
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$this->rewind(); |
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$value = $this->current(); |
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} |
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$this->next(); |
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return $value; |
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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 $this->data->current(); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function rewind(): void |
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{ |
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$this->data->rewind(); |
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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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$this->data->next(); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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4 |
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public function valid(): bool |
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{ |
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return |
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4 |
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$this->data->valid(); |
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} |
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/** |
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* {@inheritdoc} |
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131
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*/ |
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132
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4 |
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public function key() |
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{ |
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4 |
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return $this->data->key(); |
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} |
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136
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} |
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|
alecrabbit /
php-accessories
