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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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