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<?php
/**
* Class ElementList
*
* @package AmpProject\AmpWP
*/
namespace AmpProject\AmpWP\Dom;
use AmpProject\AmpWP\Component\CaptionedSlide;
use IteratorAggregate;
use Countable;
use DOMElement;
use ArrayIterator;
/**
* Class ElementList
*
* @internal
* @since 1.5.0
*/
final class ElementList implements IteratorAggregate, Countable {
/**
* The elements, possibly with captions.
*
* @var array
*/
private $elements = [];
/**
* Adds an element to the list, possibly with a caption.
*
* @param DOMElement $element The element to add, possibly an image.
* @param DOMElement|null $caption The caption for the element.
* @return ElementList A clone of this list, with the new element added.
*/
public function add( DOMElement $element, DOMElement $caption = null ) {
$cloned_list = clone $this;
$cloned_list->elements[] = null === $caption ? $element : new CaptionedSlide( $element, $caption );
return $cloned_list;
}
/**
* Gets an iterator with the elements.
*
* This together with the IteratorAggregate turns the object into a "Traversable",
* so you can just foreach over it and receive its elements in the correct type.
*
* @return ArrayIterator An iterator with the elements.
*/
public function getIterator() {
return new ArrayIterator( $this->elements );
}
/**
* Gets the count of the elements.
*
* @return int The number of elements.
*/
public function count() {
return count( $this->elements );
}
}
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