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<?php |
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declare(strict_types=1); |
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namespace TheCodingMachine\TDBM; |
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use Iterator; |
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use IteratorAggregate; |
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use Traversable; |
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/** |
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* An iterator that maps element of another iterator by calling a callback on it. |
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*/ |
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class MapIterator implements Iterator, \JsonSerializable |
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{ |
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/** |
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* @var Iterator |
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*/ |
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protected $iterator; |
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/** |
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* @var callable Modifies the current item in iterator |
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*/ |
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protected $callable; |
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/** |
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* @param Traversable|array $iterator |
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* @param callable $callable This can have two parameters |
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* |
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* @throws TDBMException |
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*/ |
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public function __construct($iterator, callable $callable) |
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{ |
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if (is_array($iterator)) { |
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$this->iterator = new \ArrayIterator($iterator); |
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} elseif ($iterator instanceof Iterator) { |
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$this->iterator = $iterator; |
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} elseif ($iterator instanceof IteratorAggregate) { |
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while (!$iterator instanceof Iterator) { |
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$iterator = $iterator->getIterator(); |
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} |
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$this->iterator = $iterator; |
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} else { |
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throw new TDBMException('$iterator parameter must be an instance of Iterator'); |
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} |
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if ($callable instanceof \Closure) { |
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// make sure there's one argument |
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$reflection = new \ReflectionObject($callable); |
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if ($reflection->hasMethod('__invoke')) { |
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$method = $reflection->getMethod('__invoke'); |
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if ($method->getNumberOfParameters() !== 1) { |
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throw new TDBMException('$callable must accept one and only one parameter.'); |
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} |
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} |
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} |
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$this->callable = $callable; |
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} |
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/** |
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* Alters the current item with $this->callable and returns a new item. |
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* Be careful with your types as we can't do static type checking here! |
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* |
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* @return mixed |
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*/ |
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public function current(): mixed |
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{ |
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$callable = $this->callable; |
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return $callable($this->iterator->current()); |
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} |
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public function next(): void |
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{ |
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$this->iterator->next(); |
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} |
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/** |
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* @return mixed |
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*/ |
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public function key(): mixed |
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{ |
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return $this->iterator->key(); |
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} |
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public function valid(): bool |
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{ |
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return $this->iterator->valid(); |
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} |
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public function rewind(): void |
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{ |
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$this->iterator->rewind(); |
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} |
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/** |
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* Casts the iterator to a PHP array. |
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* |
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* @return mixed[] |
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*/ |
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public function toArray(): array |
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{ |
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return iterator_to_array($this); |
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} |
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public function jsonSerialize(): mixed |
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{ |
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return $this->toArray(); |
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} |
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} |
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thecodingmachine /
tdbm
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