WP_HTML_Processor::run_adoption_agency_algorithm()

6068	private function run_adoption_agency_algorithm(): void {6069		$budget       = 1000;6070		$subject      = $this->get_tag();6071		$current_node = $this->state->stack_of_open_elements->current_node();6072 6073		if (6074			// > If the current node is an HTML element whose tag name is subject6075			$current_node && $subject === $current_node->node_name &&6076			// > the current node is not in the list of active formatting elements6077			! $this->state->active_formatting_elements->contains_node( $current_node )6078		) {6079			$this->state->stack_of_open_elements->pop();6080			return;6081		}6082 6083		$outer_loop_counter = 0;6084		while ( $budget-- > 0 ) {6085			if ( $outer_loop_counter++ >= 8 ) {6086				return;6087			}6088 6089			/*6090			 * > Let formatting element be the last element in the list of active formatting elements that:6091			 * >   - is between the end of the list and the last marker in the list,6092			 * >     if any, or the start of the list otherwise,6093			 * >   - and has the tag name subject.6094			 */6095			$formatting_element = null;6096			foreach ( $this->state->active_formatting_elements->walk_up() as $item ) {6097				if ( 'marker' === $item->node_name ) {6098					break;6099				}6100 6101				if ( $subject === $item->node_name ) {6102					$formatting_element = $item;6103					break;6104				}6105			}6106 6107			// > If there is no such element, then return and instead act as described in the "any other end tag" entry above.6108			if ( null === $formatting_element ) {6109				$this->bail( 'Cannot run adoption agency when "any other end tag" is required.' );6110			}6111 6112			// > If formatting element is not in the stack of open elements, then this is a parse error; remove the element from the list, and return.6113			if ( ! $this->state->stack_of_open_elements->contains_node( $formatting_element ) ) {6114				$this->state->active_formatting_elements->remove_node( $formatting_element );6115				return;6116			}6117 6118			// > If formatting element is in the stack of open elements, but the element is not in scope, then this is a parse error; return.6119			if ( ! $this->state->stack_of_open_elements->has_element_in_scope( $formatting_element->node_name ) ) {6120				return;6121			}6122 6123			/*6124			 * > Let furthest block be the topmost node in the stack of open elements that is lower in the stack6125			 * > than formatting element, and is an element in the special category. There might not be one.6126			 */6127			$is_above_formatting_element = true;6128			$furthest_block              = null;6129			foreach ( $this->state->stack_of_open_elements->walk_down() as $item ) {6130				if ( $is_above_formatting_element && $formatting_element->bookmark_name !== $item->bookmark_name ) {6131					continue;6132				}6133 6134				if ( $is_above_formatting_element ) {6135					$is_above_formatting_element = false;6136					continue;6137				}6138 6139				if ( self::is_special( $item ) ) {6140					$furthest_block = $item;6141					break;6142				}6143			}6144 6145			/*6146			 * > If there is no furthest block, then the UA must first pop all the nodes from the bottom of the6147			 * > stack of open elements, from the current node up to and including formatting element, then