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| 1 | <?php |
| 2 | |
| 3 | namespace MediaWiki\Extension\DiscussionTools; |
| 4 | |
| 5 | use Config; |
| 6 | use LogicException; |
| 7 | use MediaWiki\Extension\DiscussionTools\ThreadItem\ContentCommentItem; |
| 8 | use MediaWiki\Extension\DiscussionTools\ThreadItem\ContentThreadItem; |
| 9 | use MediaWiki\MainConfigNames; |
| 10 | use MediaWiki\Title\Title; |
| 11 | use Wikimedia\Assert\Assert; |
| 12 | use Wikimedia\Parsoid\DOM\Comment; |
| 13 | use Wikimedia\Parsoid\DOM\Element; |
| 14 | use Wikimedia\Parsoid\DOM\Node; |
| 15 | use Wikimedia\Parsoid\DOM\Text; |
| 16 | use Wikimedia\Parsoid\Utils\DOMCompat; |
| 17 | |
| 18 | class CommentUtils { |
| 19 | |
| 20 | private function __construct() { |
| 21 | } |
| 22 | |
| 23 | private static $blockElementTypes = [ |
| 24 | 'div', 'p', |
| 25 | // Tables |
| 26 | 'table', 'tbody', 'thead', 'tfoot', 'caption', 'th', 'tr', 'td', |
| 27 | // Lists |
| 28 | 'ul', 'ol', 'li', 'dl', 'dt', 'dd', |
| 29 | // HTML5 heading content |
| 30 | 'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'hgroup', |
| 31 | // HTML5 sectioning content |
| 32 | 'article', 'aside', 'body', 'nav', 'section', 'footer', 'header', 'figure', |
| 33 | 'figcaption', 'fieldset', 'details', 'blockquote', |
| 34 | // Other |
| 35 | 'hr', 'button', 'canvas', 'center', 'col', 'colgroup', 'embed', |
| 36 | 'map', 'object', 'pre', 'progress', 'video' |
| 37 | ]; |
| 38 | |
| 39 | /** |
| 40 | * @param Node $node |
| 41 | * @return bool Node is a block element |
| 42 | */ |
| 43 | public static function isBlockElement( Node $node ): bool { |
| 44 | return $node instanceof Element && |
| 45 | in_array( strtolower( $node->tagName ), static::$blockElementTypes, true ); |
| 46 | } |
| 47 | |
| 48 | private const SOL_TRANSPARENT_LINK_REGEX = |
| 49 | '/(?:^|\s)mw:PageProp\/(?:Category|redirect|Language)(?=$|\s)/D'; |
| 50 | |
| 51 | /** |
| 52 | * @param Node $node |
| 53 | * @return bool Node is considered a rendering-transparent node in Parsoid |
| 54 | */ |
| 55 | public static function isRenderingTransparentNode( Node $node ): bool { |
| 56 | $nextSibling = $node->nextSibling; |
| 57 | return ( |
| 58 | $node instanceof Comment || |
| 59 | $node instanceof Element && ( |
| 60 | strtolower( $node->tagName ) === 'meta' || |
| 61 | ( |
| 62 | strtolower( $node->tagName ) === 'link' && |
| 63 | preg_match( static::SOL_TRANSPARENT_LINK_REGEX, $node->getAttribute( 'rel' ) ?? '' ) |
| 64 | ) || |
| 65 | // Empty inline templates, e.g. tracking templates. (T269036) |
| 66 | // But not empty nodes that are just the start of a non-empty template about-group. (T290940) |
| 67 | ( |
| 68 | strtolower( $node->tagName ) === 'span' && |
| 69 | in_array( 'mw:Transclusion', explode( ' ', $node->getAttribute( 'typeof' ) ?? '' ), true ) && |
| 70 | !static::htmlTrim( DOMCompat::getInnerHTML( $node ) ) && |
| 71 | ( |
| 72 | !$nextSibling || !( $nextSibling instanceof Element ) || |
| 73 | // Maybe we should be checking all of the about-grouped nodes to see if they're empty, |
| 74 | // but that's prooobably not needed in practice, and it leads to a quadratic worst case. |
| 75 | $nextSibling->getAttribute( 'about' ) !== $node->getAttribute( 'about' ) |
| 76 | ) |
| 77 | ) |
| 78 | ) |
| 79 | ); |
| 80 | } |
| 81 | |
| 82 | /** |
| 83 | * @param Node $node |
| 84 | * @return bool Node was added to the page by DiscussionTools |
| 85 | */ |
| 86 | public static function isOurGeneratedNode( Node $node ): bool { |
| 87 | return $node instanceof Element && ( |
| 88 | DOMCompat::getClassList( $node )->contains( 'ext-discussiontools-init-replylink-buttons' ) || |
| 89 | $node->hasAttribute( 'data-mw-comment-start' ) || |
| 90 | $node->hasAttribute( 'data-mw-comment-end' ) |
| 91 | ); |
| 92 | } |
| 93 | |
| 94 | /** |
| 95 | * Elements which can't have element children (but some may have text content). |
| 96 | * |
| 97 | * @var string[] |
| 98 | */ |
| 99 | private static array $noElementChildrenElementTypes = [ |
| 100 | // https://html.spec.whatwg.org/multipage/syntax.html#elements-2 |
| 101 | // Void elements |
| 102 | 'area', 'base', 'br', 'col', 'embed', 'hr', 'img', 'input', |
| 103 | 'link', 'meta', 'param', 'source', 'track', 'wbr', |
| 104 | // Raw text elements |
| 105 | 'script', 'style', |
| 106 | // Escapable raw text elements |
| 107 | 'textarea', 'title', |
| 108 | // Foreign elements |
| 109 | 'math', 'svg', |
| 110 | // Treated like text when scripting is enabled in the parser |
| 111 | // https://html.spec.whatwg.org/#the-noscript-element |
| 112 | 'noscript', |
| 113 | // Replaced elements (that aren't already included above) |
| 114 | // https://html.spec.whatwg.org/multipage/rendering.html#replaced-elements |
| 115 | // They might allow element children, but they aren't rendered on the page. |
| 116 | 'audio', 'canvas', 'iframe', 'object', 'video', |
| 117 | ]; |
| 118 | |
| 119 | /** |
| 120 | * @param Node $node |
| 121 | * @return bool If true, node can't have element children. If false, it's complicated. |
| 122 | */ |
| 123 | public static function cantHaveElementChildren( Node $node ): bool { |
| 124 | return ( |
| 125 | $node instanceof Comment || |
| 126 | $node instanceof Element && ( |
| 127 | in_array( strtolower( $node->tagName ), static::$noElementChildrenElementTypes, true ) || |
| 128 | // Thumbnail wrappers generated by MediaTransformOutput::linkWrap (T301427), |
| 129 | // for compatibility with TimedMediaHandler. |
| 130 | // There is no better way to detect them, and we can't insert markers here, |
| 131 | // because the media DOM CSS depends on specific tag names and their order :( |
| 132 | // TODO See if we can remove this condition when wgParserEnableLegacyMediaDOM=false |
| 133 | // is enabled everywhere. |
| 134 | ( |
| 135 | in_array( strtolower( $node->tagName ), [ 'a', 'span' ], true ) && |
| 136 | $node->firstChild && |
| 137 | // We always step inside a child node so this can't be infinite, silly Phan |
| 138 | // @phan-suppress-next-line PhanInfiniteRecursion |
| 139 | static::cantHaveElementChildren( $node->firstChild ) |
| 140 | ) || |
| 141 | // Do not insert anything inside figures when using wgParserEnableLegacyMediaDOM=false, |
| 142 | // because their CSS can't handle it (T320285). |
| 143 | strtolower( $node->tagName ) === 'figure' |