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<?php
namespace MediaWiki\Extension\DiscussionTools;
use DOMException;
use Throwable;
use Wikimedia\Parsoid\DOM\Node;
/**
* Partial implementation of W3 DOM4 TreeWalker interface.
*
* See also:
* - https://dom.spec.whatwg.org/#interface-treewalker
*
* Ported from https://github.com/TRowbotham/PHPDOM (MIT)
*/
class TreeWalker {
public Node $root;
public int $whatToShow;
public Node $currentNode;
/** @var callable|null */
public $filter;
private bool $isActive = false;
/**
* See https://dom.spec.whatwg.org/#interface-treewalker
*/
public function __construct(
Node $root,
int $whatToShow = NodeFilter::SHOW_ALL,
?callable $filter = null
) {
$this->currentNode = $root;
$this->filter = $filter;
$this->root = $root;
$this->whatToShow = $whatToShow;
}
/**
* See https://dom.spec.whatwg.org/#dom-treewalker-nextnode
*
* @return Node|null The current node
*/
public function nextNode(): ?Node {
$node = $this->currentNode;
$result = NodeFilter::FILTER_ACCEPT;
while ( true ) {
while ( $result !== NodeFilter::FILTER_REJECT && $node->firstChild !== null ) {
$node = $node->firstChild;
$result = $this->filterNode( $node );
if ( $result === NodeFilter::FILTER_ACCEPT ) {
$this->currentNode = $node;
return $node;
}
}
$sibling = null;
$temp = $node;
while ( $temp !== null ) {
if ( $temp === $this->root ) {
return null;
}
$sibling = $temp->nextSibling;
if ( $sibling !== null ) {
$node = $sibling;
break;
}
$temp = $temp->parentNode;
}
'@phan-var Node $node';
$result = $this->filterNode( $node );
if ( $result === NodeFilter::FILTER_ACCEPT ) {
$this->currentNode = $node;
return $node;
}
}
}
/**
* Filters a node.
*
* @internal
*
* @see https://dom.spec.whatwg.org/#concept-node-filter
*
* @param Node $node The node to check.
* @return int Returns one of NodeFilter's FILTER_* constants.
* - NodeFilter::FILTER_ACCEPT
* - NodeFilter::FILTER_REJECT
* - NodeFilter::FILTER_SKIP
*/
private function filterNode( Node $node ): int {
if ( $this->isActive ) {
throw new DOMException( 'InvalidStateError' );
}
// Let n be node’s nodeType attribute value minus 1.
$n = $node->nodeType - 1;
// If the nth bit (where 0 is the least significant bit) of whatToShow
// is not set, return FILTER_SKIP.
if ( !( ( 1 << $n ) & $this->whatToShow ) ) {
return NodeFilter::FILTER_SKIP;
}
// If filter is null, return FILTER_ACCEPT.
if ( !$this->filter ) {
return NodeFilter::FILTER_ACCEPT;
}
$this->isActive = true;
try {
// Let $result be the return value of call a user object's operation
// with traverser's filter, "acceptNode", and Node. If this throws
// an exception, then unset traverser's active flag and rethrow the
// exception.
$result = $this->filter instanceof NodeFilter
? $this->filter->acceptNode( $node )
: ( $this->filter )( $node );
} catch ( Throwable $e ) {
$this->isActive = false;
throw $e;
}
$this->isActive = false;
return $result;
}
}