DOMUtils.php
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DOMUtils.php
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	<?php
	declare( strict_types = 1 );

	namespace Wikimedia\Parsoid\Utils;

	use Wikimedia\Assert\Assert;
	use Wikimedia\Parsoid\Core\ClientError;
	use Wikimedia\Parsoid\DOM\Comment;
	use Wikimedia\Parsoid\DOM\Document;
	use Wikimedia\Parsoid\DOM\DocumentFragment;
	use Wikimedia\Parsoid\DOM\Element;
	use Wikimedia\Parsoid\DOM\Node;
	use Wikimedia\Parsoid\DOM\Text;
	use Wikimedia\Parsoid\Wikitext\Consts;
	use Wikimedia\Parsoid\Wt2Html\XMLSerializer;
	use Wikimedia\RemexHtml\DOM\DOMBuilder;
	use Wikimedia\RemexHtml\Tokenizer\Tokenizer;
	use Wikimedia\RemexHtml\TreeBuilder\Dispatcher;
	use Wikimedia\RemexHtml\TreeBuilder\TreeBuilder;

	/**
	* DOM utilities for querying the DOM. This is largely independent of Parsoid
	* although some Parsoid details (TokenUtils, inline content version)
	* have snuck in.
	*/
	class DOMUtils {

	/**
	* Parse HTML, return the tree.
	*
	* @param string $html
	* @param bool $validateXMLNames
	* @return Document
	*/
	public static function parseHTML(
	string $html, bool $validateXMLNames = false
	): Document {
	if ( !preg_match( '/^<(?:!doctype\|html\|body)/i', $html ) ) {
	// Make sure that we parse fragments in the body. Otherwise comments,
	// link and meta tags end up outside the html element or in the head
	// elements.
	$html = '<body>' . $html;
	}

	$domBuilder = new class( [
	'suppressHtmlNamespace' => true,
	] ) extends DOMBuilder {
	/** @inheritDoc */
	protected function createDocument(
	?string $doctypeName = null,
	?string $public = null,
	?string $system = null
	) {
	// @phan-suppress-next-line PhanTypeMismatchReturn
	return DOMCompat::newDocument( false );
	}
	};
	$treeBuilder = new TreeBuilder( $domBuilder, [ 'ignoreErrors' => true ] );
	$dispatcher = new Dispatcher( $treeBuilder );
	$tokenizer = new Tokenizer( $dispatcher, $html, [ 'ignoreErrors' => true ] );
	$tokenizer->execute( [] );
	if ( $validateXMLNames && $domBuilder->isCoerced() ) {
	throw new ClientError( 'Encountered a name invalid in XML.' );
	}
	$frag = $domBuilder->getFragment();
	'@phan-var Document $frag'; // @var Document $frag
	return $frag;
	}

	/**
	* This is a simplified version of the DOMTraverser.
	* Consider using that before making this more complex.
	*
	* FIXME: Move to DOMTraverser OR create a new class?
	* @param Node $node
	* @param callable $handler
	* @param mixed ...$args
	*/
	public static function visitDOM( Node $node, callable $handler, ...$args ): void {
	$handler( $node, ...$args );
	$node = $node->firstChild;
	while ( $node ) {
	$next = $node->nextSibling;
	self::visitDOM( $node, $handler, ...$args );
	$node = $next;
	}
	}

	/**
	* Move 'from'.childNodes to 'to' adding them before 'beforeNode'
	* If 'beforeNode' is null, the nodes are appended at the end.
	* @param Node $from Source node. Children will be removed.
	* @param Node $to Destination node. Children of $from will be added here
	* @param ?Node $beforeNode Add the children before this node.
	*/
	public static function migrateChildren(
	Node $from, Node $to, ?Node $beforeNode = null
	): void {
	while ( $from->firstChild ) {
	$to->insertBefore( $from->firstChild, $beforeNode );
	}
	}

	/**
	* Copy 'from'.childNodes to 'to' adding them before 'beforeNode'
	* 'from' and 'to' belong to different documents.
	*
	* If 'beforeNode' is null, the nodes are appended at the end.
	* @param Node $from
	* @param Node $to
	* @param ?Node $beforeNode
	*/
	public static function migrateChildrenBetweenDocs(
	Node $from, Node $to, ?Node $beforeNode = null
	): void {
	$n = $from->firstChild;
	$destDoc = $to->ownerDocument;
	while ( $n ) {
	$to->insertBefore( $destDoc->importNode( $n, true ), $beforeNode );
	$n = $n->nextSibling;
	}
	}

	// phpcs doesn't like @phan-assert...
	// phpcs:disable MediaWiki.Commenting.FunctionAnnotations.UnrecognizedAnnotation

	/**
	* Assert that this is a DOM element node.
	* This is primarily to help phan analyze variable types.
	* @phan-assert Element $node
	* @param ?Node $node
	* @return bool Always returns true
	* @phan-assert Element $node
	*/
	public static function assertElt( ?Node $node ): bool {
	Assert::invariant( $node instanceof Element, "Expected an element" );
	return true;
	}

	/**
	* @param ?Node $node
	* @return bool
	*/
	public static function isRemexBlockNode( ?Node $node ): bool {
	return $node instanceof Element &&
	!isset( Consts::$HTML['OnlyInlineElements'][DOMCompat::nodeName( $node )] ) &&
	// This is a superset of \\MediaWiki\Tidy\RemexCompatMunger::$metadataElements
	!self::isMetaDataTag( $node );
	}

	/**
	* @param ?Node $node
	* @return bool
	*/
	public static function isWikitextBlockNode( ?Node $node ): bool {
	return $node && TokenUtils::isWikitextBlockTag( DOMCompat::nodeName( $node ) );
	}

	/**
	* Determine whether this is a formatting DOM element.
	* @param ?Node $node
	* @return bool
	*/
	public static function isFormattingElt( ?Node $node ): bool {
	return $node && isset( Consts::$HTML['FormattingTags'][DOMCompat::nodeName( $node )] );
	}

	/**
	* Determine whether this is a quote DOM element.
	* @param ?Node $node
	* @return bool
	*/
	public static function isQuoteElt( ?Node $node ): bool {
	return $node && isset( Consts::$WTQuoteTags[DOMCompat::nodeName( $node )] );
	}

	/**
	* Determine whether this is the <body> DOM element.
	* @param ?Node $node
	* @return bool
	*/
	public static function isBody( ?Node $node ): bool {
	return $node && DOMCompat::nodeName( $node ) === 'body';
	}

	/**
	* Determine whether this is a removed DOM node but Node object yet
	* @param ?Node $node
	* @return bool
	*/
	public static function isRemoved( ?Node $node ): bool {
	return !$node \|\| !isset( $node->nodeType );
	}

	/**
	* Build path from a node to the root of the document.
	*
	* @param Node $node
	* @return Node[] Path including all nodes from $node to the root of the document
	*/
	public static function pathToRoot( Node $node ): array {
	$path = [];
	do {
	$path[] = $node;
	// phpcs:ignore Generic.CodeAnalysis.AssignmentInCondition.FoundInWhileCondition
	} while ( $node = $node->parentNode );
	return $path;
	}

	/**
	* Compute the edge length of the path from $node to the root.
	* Root document is at depth 0, <html> at 1, <body> at 2.
	* @param Node $node
	* @return int
	*/
	public static function nodeDepth( Node $node ): int {
	$edges = 0;
	// phpcs:ignore Generic.CodeAnalysis.AssignmentInCondition.FoundInWhileCondition
	while ( $node = $node->parentNode ) {
	$edges++;
	}
	return $edges;
	}

	/**
	* Build path from a node to its passed-in sibling.
	* Return will not include the passed-in sibling.
	*
	* @param Node $node
	* @param Node $sibling
	* @param bool $left indicates whether to go backwards, use previousSibling instead of nextSibling.
	* @return Node[]
	*/
	public static function pathToSibling( Node $node, Node $sibling, bool $left ): array {
	$path = [];
	while ( $node && $node !== $sibling ) {
	$path[] = $node;
	$node = $left ? $node->previousSibling : $node->nextSibling;
	}
	return $path;
	}

	/**
	* Check whether a node `n1` comes before another node `n2` in
	* their parent's children list.
	*
	* @param Node $n1 The node you expect to come first.
	* @param Node $n2 Expected later sibling.
	* @return bool
	*/
	public static function inSiblingOrder( Node $n1, Node $n2 ): bool {
	while ( $n1 && $n1 !== $n2 ) {
	$n1 = $n1->nextSibling;
	}
	return $n1 !== null;
	}

	/**
	* Check that a node 'n1' is an ancestor of another node 'n2' in
	* the DOM. Returns true if n1 === n2.
	* $n1 is the suspected ancestor.
	* $n2 The suspected descendant.
	*
	* @param Node $n1
	* @param Node $n2
	* @return bool
	*/
	public static function isAncestorOf( Node $n1, Node $n2 ): bool {
	while ( $n2 && $n2 !== $n1 ) {
	$n2 = $n2->parentNode;
	}
	return $n2 !== null;
	}

	/**
	* Find an ancestor of $node with nodeName $name.
	*
	* @param Node $node
	* @param string $name
	* @return ?Element
	*/
	public static function findAncestorOfName( Node $node, string $name ): ?Element {
	$node = $node->parentNode;
	while ( $node && DOMCompat::nodeName( $node ) !== $name ) {
	$node = $node->parentNode;
	}
	'@phan-var Element $node'; // @var Element $node
	return $node;
	}

	/**
	* Check whether $node has $name or has an ancestor named $name.
	*
	* @param Node $node
	* @param string $name
	* @return bool
	*/
	public static function hasNameOrHasAncestorOfName( Node $node, string $name ): bool {
	return DOMCompat::nodeName( $node ) === $name \|\| self::findAncestorOfName( $node, $name ) !== null;
	}

	/**
	* Determine whether the node matches the given nodeName and attribute value.
	* Returns true if node name matches and the attribute equals "typeof"
	*
	* @param Node $n The node to test
	* @param string $name The expected nodeName of $n
	* @param string $typeRe Regular expression matching the expected value of
	* `typeof` attribute.
	* @return ?string The matching `typeof` value, or `null` if there is
	* no match.
	*/
	public static function matchNameAndTypeOf( Node $n, string $name, string $typeRe ): ?string {
	return DOMCompat::nodeName( $n ) === $name ? self::matchTypeOf( $n, $typeRe ) : null;
	}

	/**
	* Determine whether the node matches the given nodeName and typeof
	* attribute value; the typeof is given as string.
	*
	* @param Node $n
	* @param string $name node name to test for
	* @param string $type Expected value of "typeof" attribute (literal string)
	* @return bool True if the node matches.
	*/
	public static function hasNameAndTypeOf( Node $n, string $name, string $type ): bool {
	return self::matchNameAndTypeOf(
	$n, $name, '/^' . preg_quote( $type, '/' ) . '$/'
	) !== null;
	}

	/**
	* Determine whether the node matches the given `typeof` attribute value.
	*
	* @param Node $n The node to test
	* @param string $typeRe Regular expression matching the expected value of
	* the `typeof` attribute.
	* @return ?string The matching `typeof` value, or `null` if there is
	* no match.
	*/
	public static function matchTypeOf( Node $n, string $typeRe ): ?string {
	return self::matchMultivalAttr( $n, 'typeof', $typeRe );
	}

	/**
	* Determine whether the node matches the given `rel` attribute value.
	*
	* @param Node $n The node to test
	* @param string $relRe Regular expression matching the expected value of
	* the `rel` attribute.
	* @return ?string The matching `rel` value, or `null` if there is
	* no match.
	*/
	public static function matchRel( Node $n, string $relRe ): ?string {
	return self::matchMultivalAttr( $n, 'rel', $relRe );
	}

	/**
	* Determine whether the node matches the given multivalue attribute value.
	*
	* @param Node $n The node to test
	* @param string $attrName the attribute to test (typically 'rel' or 'typeof')
	* @param string $valueRe Regular expression matching the expected value of
	* the attribute.
	* @return ?string The matching attribute value, or `null` if there is
	* no match.
	*/
	private static function matchMultivalAttr( Node $n, string $attrName, string $valueRe ): ?string {
	if ( !( $n instanceof Element ) ) {
	return null;
	}
	$attrValue = DOMCompat::getAttribute( $n, $attrName );
	if ( $attrValue === null \|\| $attrValue === '' ) {
	return null;
	}
	foreach ( explode( ' ', $attrValue ) as $ty ) {
	if ( $ty === '' ) {
	continue;
	}
	$count = preg_match( $valueRe, $ty );
	Assert::invariant( $count !== false, "Bad regexp" );
	if ( $count ) {
	return $ty;
	}
	}
	return null;
	}

	/**
	* Determine whether the node matches the given typeof attribute value.
	*
	* @param Node $n
	* @param string $type Expected value of "typeof" attribute, as a literal
	* string.
	* @return bool True if the node matches.
	*/
	public static function hasTypeOf( Node $n, string $type ): bool {
	return self::hasValueInMultivalAttr( $n, 'typeof', $type );
	}

	/**
	* Determine whether the node matches the given rel attribute value.
	*
	* @param Node $n
	* @param string $rel Expected value of "rel" attribute, as a literal string.
	* @return bool True if the node matches.
	*/
	public static function hasRel( Node $n, string $rel ): bool {
	return self::hasValueInMultivalAttr( $n, 'rel', $rel );
	}

	/**
	* @param Element $element
	* @param string $regex Partial regular expression, e.g. "foo\|bar"
	* @return bool
	*/
	public static function hasClass( Element $element, string $regex ): bool {
	$value = DOMCompat::getAttribute( $element, 'class' );
	return (bool)preg_match( '{(?<=^\|\s)' . $regex . '(?=\s\|$)}', $value ?? '' );
	}

	/**
	* Determine whether the node matches the given attribute value for a multivalued attribute
	* @param Node $n
	* @param string $attrName name of the attribute to check (typically 'typeof', 'rel')
	* @param string $value Expected value of $attrName" attribute, as a literal string.
	* @return bool True if the node matches
	*/
	private static function hasValueInMultivalAttr( Node $n, string $attrName, string $value ): bool {
	// fast path
	if ( !( $n instanceof Element ) ) {
	return false;
	}
	$attrValue = DOMCompat::getAttribute( $n, $attrName );
	if ( $attrValue === null \|\| $attrValue === '' ) {
	return false;
	}
	if ( $attrValue === $value ) {
	return true;
	}
	// fallback
	return in_array( $value, explode( ' ', $attrValue ), true );
	}

	/**
	* Add a type to the typeof attribute. This method should almost always
	* be used instead of `setAttribute`, to ensure we don't overwrite existing
	* typeof information.
	*
	* @param Element $node node
	* @param string $type type
	* @param bool $prepend If true, adds value to start, rather than end.
	* Use of this option in new code is discouraged.
	*/
	public static function addTypeOf( Element $node, string $type, bool $prepend = false ): void {
	self::addValueToMultivalAttr( $node, 'typeof', $type, $prepend );
	}

	/**
	* Add a type to the rel attribute. This method should almost always
	* be used instead of `setAttribute`, to ensure we don't overwrite existing
	* rel information.
	*
	* @param Element $node node
	* @param string $rel type
	*/
	public static function addRel( Element $node, string $rel ): void {
	self::addValueToMultivalAttr( $node, 'rel', $rel );
	}

	/**
	* Add an element to a multivalue attribute (typeof, rel). This method should almost always
	* be used instead of `setAttribute`, to ensure we don't overwrite existing
	* multivalue information.
	*
	* @param Element $node
	* @param string $attr
	* @param string $value
	* @param bool $prepend If true, adds value to start, rather than end
	*/
	private static function addValueToMultivalAttr(
	Element $node, string $attr, string $value, bool $prepend = false
	): void {
	$value = trim( $value );
	if ( $value === '' ) {
	return;
	}
	$oldValue = DOMCompat::getAttribute( $node, $attr );
	if ( $oldValue !== null && trim( $oldValue ) !== '' ) {
	$values = explode( ' ', trim( $oldValue ) );
	if ( in_array( $value, $values, true ) ) {
	return;
	}
	$value = $prepend ? "$value $oldValue" : "$oldValue $value";
	}
	$node->setAttribute( $attr, $value );
	}

	/**
	* Remove a value from a multiple-valued attribute.
	*
	* @param Element $node node
	* @param string $attr The attribute name
	* @param string $value The value to remove
	*/
	private static function removeValueFromMultivalAttr(
	Element $node, string $attr, string $value
	): void {
	$oldValue = DOMCompat::getAttribute( $node, $attr );
	if ( $oldValue !== null && $oldValue !== '' ) {
	$value = trim( $value );
	$types = array_diff( explode( ' ', $oldValue ), [ $value ] );
	if ( count( $types ) > 0 ) {
	$node->setAttribute( $attr, implode( ' ', $types ) );
	} else {
	$node->removeAttribute( $attr );
	}
	}
	}

	/**
	* Remove a type from the typeof attribute.
	*
	* @param Element $node node
	* @param string $type type
	*/
	public static function removeTypeOf( Element $node, string $type ): void {
	self::removeValueFromMultivalAttr( $node, 'typeof', $type );
	}

	/**
	* Remove a type from the rel attribute.
	*
	* @param Element $node node
	* @param string $rel rel
	*/
	public static function removeRel( Element $node, string $rel ): void {
	self::removeValueFromMultivalAttr( $node, 'rel', $rel );
	}

	/**
	* Check whether `node` is in a fosterable position.
	*
	* @param ?Node $n
	* @return bool
	*/
	public static function isFosterablePosition( ?Node $n ): bool {
	return $n && isset( Consts::$HTML['FosterablePosition'][DOMCompat::nodeName( $n->parentNode )] );
	}

	/**
	* Check whether `node` is a heading.
	*
	* @param ?Node $n
	* @return bool
	*/
	public static function isHeading( ?Node $n ): bool {
	return $n && preg_match( '/^h[1-6]$/D', DOMCompat::nodeName( $n ) );
	}

	/**
	* Check whether `node` is a list.
	*
	* @param ?Node $n
	* @return bool
	*/
	public static function isList( ?Node $n ): bool {
	return $n && isset( Consts::$HTML['ListTags'][DOMCompat::nodeName( $n )] );
	}

	/**
	* Check whether `node` is a list item.
	*
	* @param ?Node $n
	* @return bool
	*/
	public static function isListItem( ?Node $n ): bool {
	return $n && isset( Consts::$HTML['ListItemTags'][DOMCompat::nodeName( $n )] );
	}

	/**
	* Check whether `node` is a list or list item.
	*
	* @param ?Node $n
	* @return bool
	*/
	public static function isListOrListItem( ?Node $n ): bool {
	return self::isList( $n ) \|\| self::isListItem( $n );
	}

	/**
	* Check whether `node` is nestee in a list item.
	*
	* @param ?Node $n
	* @return bool
	*/
	public static function isNestedInListItem( ?Node $n ): bool {
	$parentNode = $n->parentNode;
	while ( $parentNode ) {
	if ( self::isListItem( $parentNode ) ) {
	return true;
	}
	$parentNode = $parentNode->parentNode;
	}
	return false;
	}

	/**
	* Check whether `node` is a nested list or a list item.
	*
	* @param ?Node $n
	* @return bool
	*/
	public static function isNestedListOrListItem( ?Node $n ): bool {
	return self::isListOrListItem( $n ) && self::isNestedInListItem( $n );
	}

	/**
	* Check a node to see whether it's a meta with some typeof.
	*
	* @param Node $n
	* @param string $type
	* @return bool
	*/
	public static function isMarkerMeta( Node $n, string $type ): bool {
	return self::hasNameAndTypeOf( $n, 'meta', $type );
	}

	/**
	* Check whether a node has any children that are elements.
	*
	* @param Node $node
	* @return bool
	*/
	public static function hasElementChild( Node $node ): bool {
	for ( $child = $node->firstChild; $child; $child = $child->nextSibling ) {
	if ( $child instanceof Element ) {
	return true;
	}
	}
	return false;
	}

	/**
	* Check if a node has a block-level element descendant.
	*
	* @param Node $node
	* @return bool
	*/
	public static function hasBlockElementDescendant( Node $node ): bool {
	for ( $child = $node->firstChild; $child; $child = $child->nextSibling ) {
	if ( $child instanceof Element &&
	( self::isWikitextBlockNode( $child ) \|\| // Is a block-level node
	self::hasBlockElementDescendant( $child ) ) // or has a block-level child or grandchild or..
	) {
	return true;
	}
	}
	return false;
	}

	/**
	* Is a node representing inter-element whitespace?
	*
	* @param ?Node $node
	* @return bool
	*/
	public static function isIEW( ?Node $node ): bool {
	// ws-only
	return $node instanceof Text && preg_match( '/^\s*$/D', $node->nodeValue );
	}

	/**
	* Is a node a document fragment?
	*
	* @param ?Node $node
	* @return bool
	*/
	public static function isDocumentFragment( ?Node $node ): bool {
	return $node && $node->nodeType === XML_DOCUMENT_FRAG_NODE;
	}

	/**
	* Is a node at the top?
	*
	* @param ?Node $node
	* @return bool
	*/
	public static function atTheTop( ?Node $node ): bool {
	return self::isDocumentFragment( $node ) \|\| self::isBody( $node );
	}

	/**
	* Are all children of this node text or comment nodes?
	*
	* @param Node $node
	* @return bool
	*/
	public static function allChildrenAreTextOrComments( Node $node ): bool {
	$child = $node->firstChild;
	while ( $child ) {
	if ( !( $child instanceof Text \|\| $child instanceof Comment ) ) {
	return false;
	}
	$child = $child->nextSibling;
	}
	return true;
	}

	/**
	* Check if the dom-subtree rooted at node has an element with tag name 'tagName'
	* By default, the root node is not checked.
	*
	* @param Node $node The DOM node whose tree should be checked
	* @param string $tagName Tag name to look for
	* @param bool $checkRoot Should the root be checked?
	* @return bool
	*/
	public static function treeHasElement( Node $node, string $tagName, bool $checkRoot = false ): bool {
	if ( $checkRoot && DOMCompat::nodeName( $node ) === $tagName ) {
	return true;
	}

	$node = $node->firstChild;
	while ( $node ) {
	if ( $node instanceof Element ) {
	if ( self::treeHasElement( $node, $tagName, true ) ) {
	return true;
	}
	}
	$node = $node->nextSibling;
	}
	return false;
	}

	/**
	* Is node a table tag (table, tbody, td, tr, etc.)?
	*
	* @param Node $node
	* @return bool
	*/
	public static function isTableTag( Node $node ): bool {
	return isset( Consts::$HTML['TableTags'][DOMCompat::nodeName( $node )] );
	}

	/**
	* Returns a media element nested in `node`
	*
	* @param Element $node
	* @return Element\|null
	*/
	public static function selectMediaElt( Element $node ): ?Element {
	return DOMCompat::querySelector( $node, 'img, video, audio' );
	}

	/**
	* Extract http-equiv headers from the HTML, including content-language and
	* vary headers, if present
	*
	* @param Document $doc
	* @return array<string,string>
	*/
	public static function findHttpEquivHeaders( Document $doc ): array {
	$elts = DOMCompat::querySelectorAll( $doc, 'meta[http-equiv][content]' );
	$r = [];
	foreach ( $elts as $el ) {
	$r[strtolower(
	DOMCompat::getAttribute( $el, 'http-equiv' )
	)] = DOMCompat::getAttribute( $el, 'content' );
	}
	return $r;
	}

	/**
	* Add or replace http-equiv headers in the HTML <head>.
	* This is used for content-language and vary headers, among possible
	* others.
	* @param Document $doc The HTML document to update
	* @param array<string,string\|string[]> $headers An array mapping HTTP
	* header names (which are case-insensitive) to new values. If an
	* array of values is provided, they will be joined with commas.
	*/
	public static function addHttpEquivHeaders( Document $doc, array $headers ): void {
	foreach ( $headers as $key => $value ) {
	if ( is_array( $value ) ) {
	$value = implode( ',', $value );
	}
	// HTTP header names are case-insensitive; hence the "i" suffix
	// on this selector query.
	$el = DOMCompat::querySelector( $doc, "meta[http-equiv=\"{$key}\"i]" );
	if ( !$el ) {
	// This also ensures there is a <head> element.
	$el = self::appendToHead( $doc, 'meta', [ 'http-equiv' => $key ] );
	}
	$el->setAttribute( 'content', $value );

	}
	}

	/**
	* @param Document $doc
	* @return string\|null
	*/
	public static function extractInlinedContentVersion( Document $doc ): ?string {
	$el = DOMCompat::querySelector( $doc,
	'meta[property="mw:htmlVersion"], meta[property="mw:html:version"]' );
	return $el ? DOMCompat::getAttribute( $el, 'content' ) : null;
	}

	/**
	* Add attributes to a node element.
	*
	* @param Element $elt element
	* @param array $attrs attributes
	*/
	public static function addAttributes( Element $elt, array $attrs ): void {
	foreach ( $attrs as $key => $value ) {
	if ( $value !== null ) {
	if ( $key === 'id' ) {
	DOMCompat::setIdAttribute( $elt, $value );
	} else {
	$elt->setAttribute( $key, $value );
	}
	}
	}
	}

	/**
	* Create an element in the document head with the given attrs.
	* Creates the head element in the document if needed.
	*
	* @param Document $document
	* @param string $tagName
	* @param array $attrs
	* @return Element The newly-appended Element
	*/
	public static function appendToHead( Document $document, string $tagName, array $attrs = [] ): Element {
	$elt = $document->createElement( $tagName );
	self::addAttributes( $elt, $attrs );
	$head = DOMCompat::getHead( $document );
	if ( !$head ) {
	$head = $document->createElement( 'head' );
	$document->documentElement->insertBefore(
	$head, DOMCompat::getBody( $document )
	);
	}
	$head->appendChild( $elt );
	return $elt;
	}

	/**
	* innerHTML and outerHTML are not defined on DocumentFragment.
	*
	* Defined similarly to DOMCompat::getInnerHTML()
	*
	* @param DocumentFragment $frag
	* @return string
	*/
	public static function getFragmentInnerHTML(
	DocumentFragment $frag
	): string {
	return XMLSerializer::serialize(
	$frag, [ 'innerXML' => true ]
	)['html'];
	}

	/**
	* innerHTML and outerHTML are not defined on DocumentFragment.
	* @see DOMCompat::setInnerHTML() for the Element version
	*
	* @param DocumentFragment $frag
	* @param string $html
	*/
	public static function setFragmentInnerHTML(
	DocumentFragment $frag, string $html
	): void {
	// FIXME: This should be an HTML5 template element
	$body = $frag->ownerDocument->createElement( 'body' );
	DOMCompat::setInnerHTML( $body, $html );
	self::migrateChildren( $body, $frag );
	}

	/**
	* @param Document $doc
	* @param string $html
	* @return DocumentFragment
	*/
	public static function parseHTMLToFragment(
	Document $doc, string $html
	): DocumentFragment {
	$frag = $doc->createDocumentFragment();
	self::setFragmentInnerHTML( $frag, $html );
	return $frag;
	}

	/**
	* @param Node $node
	* @return bool
	*/
	public static function isRawTextElement( Node $node ): bool {
	return isset( Consts::$HTML['RawTextElements'][DOMCompat::nodeName( $node )] );
	}

	/**
	* Is 'n' a block tag, or does the subtree rooted at 'n' have a block tag
	* in it?
	*
	* @param Node $n
	* @return bool
	*/
	public static function hasBlockTag( Node $n ): bool {
	if ( self::isRemexBlockNode( $n ) ) {
	return true;
	}
	$c = $n->firstChild;
	while ( $c ) {
	if ( self::hasBlockTag( $c ) ) {
	return true;
	}
	$c = $c->nextSibling;
	}
	return false;
	}

	/**
	* Get an associative array of attributes, suitable for serialization.
	*
	* Add the xmlns attribute if available, to workaround PHP's surprising
	* behavior with the xmlns attribute: HTML is not an XML document,
	* but various parts of PHP (including our misnamed XMLSerializer) pretend
	* that it is, sort of.
	*
	* @param Element $element
	* @return array<string,string>
	* @see https://phabricator.wikimedia.org/T235295
	*/
	public static function attributes( Element $element ): array {
	$result = [];
	// The 'xmlns' attribute is "invisible" T235295
	$xmlns = DOMCompat::getAttribute( $element, 'xmlns' );
	if ( $xmlns !== null ) {
	$result['xmlns'] = $xmlns;
	}
	foreach ( $element->attributes as $attr ) {
	$result[$attr->name] = $attr->value;
	}
	return $result;
	}

	/**
	* @param Element $node
	* @return bool
	*/
	public static function isMetaDataTag( Element $node ): bool {
	return isset( Consts::$HTML['MetaDataTags'][DOMCompat::nodeName( $node )] );
	}

	/**
	* Strip a paragraph wrapper, if any, before parsing HTML to DOM
	*/
	public static function stripPWrapper( string $ret ): string {
	return preg_replace( '#(^<p>)\|(\n</p>(' . Utils::COMMENT_REGEXP_FRAGMENT . '\|\s)*$)#D', '', $ret );
	}
	}

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