HTML API: Prevent fragment creation on close tag.

Prevent fragments from being created at tag closers.

Follow-up to [59444].

Props jonsurrell, bernhard-reiter.
Fixes #62357.


git-svn-id: https://develop.svn.wordpress.org/trunk@59450 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/html-api/class-wp-html-processor.php

@@ -464,7 +464,7 @@ function ( WP_HTML_Token $token ): void {
 	 * @return static|null The created processor if successful, otherwise null.
 	 */
 	public function create_fragment_at_current_node( string $html ) {
-		if ( $this->get_token_type() !== '#tag' ) {
+		if ( $this->get_token_type() !== '#tag' || $this->is_tag_closer() ) {
 			return null;
 		}
 

tests/phpunit/tests/html-api/wpHtmlProcessor.php

@@ -1103,6 +1103,23 @@ public function test_create_fragment_at_current_node_in_foreign_content_integrat
 		$this->assertTrue( $fragment->expects_closer() );
 	}
 
+	/**
+	 * @ticket 62357
+	 */
+	public function test_prevent_fragment_creation_on_closers() {
+		$processor = WP_HTML_Processor::create_full_parser( '<p></p>' );
+		$processor->next_tag( 'P' );
+		$processor->next_tag(
+			array(
+				'tag_name'    => 'P',
+				'tag_closers' => 'visit',
+			)
+		);
+		$this->assertSame( 'P', $processor->get_tag() );
+		$this->assertTrue( $processor->is_tag_closer() );
+		$this->assertNull( $processor->create_fragment_at_current_node( '<i>fragment HTML</i>' ) );
+	}
+
 	/**
 	 * Ensure that lowercased tag_name query matches tags case-insensitively.
 	 *