mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/DiscussionTools
synced 2024-11-30 19:16:39 +00:00
781a33357b
MediaWiki's PHPCS plugin requires documentation comments on all properties, unless those properties are typed. This has potential to introduce bugs – in particular, because typed properties without a default value will throw an exception if their value is accessed before it's defined, while previously they defaulted to null. I fixed this when I found it (making them nullable and null by default), but I may have missed some cases. Change-Id: If5b1f4d542ce3e1b69327ee4283f7c3e133a62a0
146 lines
3.1 KiB
PHP
146 lines
3.1 KiB
PHP
<?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 */
|
||
public $filter;
|
||
private bool $isActive = false;
|
||
|
||
/**
|
||
* See https://dom.spec.whatwg.org/#interface-treewalker
|
||
*
|
||
* @param Node $root
|
||
* @param int $whatToShow
|
||
* @param callable|null $filter
|
||
*/
|
||
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;
|
||
}
|
||
}
|