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<?php
namespace Gt\Dom;
use DOMNodeList;
use ArrayAccess;
use Countable;
use Iterator;
/**
* @property-read int $length
*/
class NodeList implements Iterator, ArrayAccess, Countable {
use LiveProperty;
protected $list;
protected $iteratorKey;
public function __construct(DOMNodeList $domNodeList) {
$this->list = $domNodeList;
}
/**
* Returns the number of Nodes contained in this Collection. On the
* NodeList class this counts all types of Node object,
* not just Elements.
* @return int Number of Elements
*/
protected function prop_get_length():int {
return $this->list->length;
}
/**
* Gets the nth Element object in the internal DOMNodeList.
* @param int $index
* @return Element|null
*/
public function item(int $index):?Element {
/** @noinspection PhpIncompatibleReturnTypeInspection */
return $this->list->item($index) ?? null;
}
// Iterator --------------------------------------------------------------------
public function rewind():void {
$this->iteratorKey = 0;
}
public function key():int {
return $this->iteratorKey;
}
public function valid():bool {
return isset($this->list[$this->key()]);
}
public function next():void {
$this->iteratorKey++;
}
/** @return Node|null */
public function current() {
return $this->list[$this->key()] ?? null;
}
// ArrayAccess -----------------------------------------------------------------
public function offsetExists($offset):bool {
return isset($offset, $this->list);
}
public function offsetGet($offset):?Element {
return $this->item($offset);
}
public function offsetSet($offset, $value):void {
throw new \BadMethodCallException("NodeList's items are read only");
}
public function offsetUnset($offset):void {
throw new \BadMethodCallException("NodeList's items are read only");
}
// Countable -------------------------------------------------------------------
public function count():int {
return $this->length;
}
}