HTML API: Allow any fragment context.

dmsnell · dmsnell · commit ec5776b1ddc5 · 2024-08-01T16:53:25.000-07:00
Previously, the fragment parser in WP_HTML_Processor has only allowed
creating a fragment with the `&lt;body&gt;` context. In this patch, any
context node is allowed.
diff --git a/src/wp-includes/html-api/class-wp-html-processor.php b/src/wp-includes/html-api/class-wp-html-processor.php
@@ -293,12 +293,27 @@ class WP_HTML_Processor extends WP_HTML_Tag_Processor {
 	 * @return static|null The created processor if successful, otherwise null.
 	 */
 	public static function create_fragment( $html, $context = '<body>', $encoding = 'UTF-8' ) {
-		if ( '<body>' !== $context || 'UTF-8' !== $encoding ) {
+		if ( 'UTF-8' !== $encoding ) {
+			return null;
+		}
+
+		$context_processor = new WP_HTML_Tag_Processor( $context );
+		if ( ! $context_processor->next_token() || '#tag' !== $context_processor->get_token_type() ) {
+			return null;
+		}
+
+		$context_tag        = $context_processor->get_tag();
+		$context_attributes = array();
+		foreach ( $context_processor->get_attribute_names_with_prefix( '' ) as $name ) {
+			$context_attributes[ $name ] = $context_processor->get_attribute( $name );
+		}
+
+		if ( $context_processor->next_token() ) {
 			return null;
 		}
 
 		$processor                             = new static( $html, self::CONSTRUCTOR_UNLOCK_CODE );
-		$processor->state->context_node        = array( 'BODY', array() );
+		$processor->state->context_node        = array( $context_tag, $context_attributes );
 		$processor->state->insertion_mode      = WP_HTML_Processor_State::INSERTION_MODE_IN_BODY;
 		$processor->state->encoding            = $encoding;
 		$processor->state->encoding_confidence = 'certain';
