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| 1 | <?php |
| 2 | |
| 3 | namespace MediaWiki\Extension\DiscussionTools; |
| 4 | |
| 5 | use DOMException; |
| 6 | use Wikimedia\Parsoid\DOM\Node; |
| 7 | |
| 8 | /** |
| 9 | * Partial implementation of W3 DOM4 NodeFilter interface. |
| 10 | * |
| 11 | * See also: |
| 12 | * - https://dom.spec.whatwg.org/#interface-nodefilter |
| 13 | * |
| 14 | * Adapted from https://github.com/Krinkle/dom-TreeWalker-polyfill/blob/master/src/TreeWalker-polyfill.js |
| 15 | */ |
| 16 | class NodeFilter { |
| 17 | |
| 18 | // Constants for acceptNode() |
| 19 | public const FILTER_ACCEPT = 1; |
| 20 | public const FILTER_REJECT = 2; |
| 21 | public const FILTER_SKIP = 3; |
| 22 | |
| 23 | // Constants for whatToShow |
| 24 | public const SHOW_ALL = 0xFFFFFFFF; |
| 25 | public const SHOW_ELEMENT = 0x1; |
| 26 | public const SHOW_ATTRIBUTE = 0x2; |
| 27 | public const SHOW_TEXT = 0x4; |
| 28 | public const SHOW_CDATA_SECTION = 0x8; |
| 29 | public const SHOW_ENTITY_REFERENCE = 0x10; |
| 30 | public const SHOW_ENTITY = 0x20; |
| 31 | public const SHOW_PROCESSING_INSTRUCTION = 0x40; |
| 32 | public const SHOW_COMMENT = 0x80; |
| 33 | public const SHOW_DOCUMENT = 0x100; |
| 34 | public const SHOW_DOCUMENT_TYPE = 0x200; |
| 35 | public const SHOW_DOCUMENT_FRAGMENT = 0x400; |
| 36 | public const SHOW_NOTATION = 0x800; |
| 37 | |
| 38 | /** @var callable */ |
| 39 | public $filter; |
| 40 | |
| 41 | private bool $active = false; |
| 42 | |
| 43 | /** |
| 44 | * See https://dom.spec.whatwg.org/#dom-nodefilter-acceptnode |
| 45 | * |
| 46 | * @param Node $node |
| 47 | * @return int Constant NodeFilter::FILTER_ACCEPT, |
| 48 | * NodeFilter::FILTER_REJECT or NodeFilter::FILTER_SKIP. |
| 49 | */ |
| 50 | public function acceptNode( $node ) { |
| 51 | if ( $this->active ) { |
| 52 | throw new DOMException( 'INVALID_STATE_ERR' ); |
| 53 | } |
| 54 | |
| 55 | $this->active = true; |
| 56 | $result = ( $this->filter )( $node ); |
| 57 | $this->active = false; |
| 58 | |
| 59 | return $result; |
| 60 | } |
| 61 | } |