WP_Block_Parser::proceed(): bool

90	public function proceed() {91		$next_token = $this->next_token();92		list( $token_type, $block_name, $attrs, $start_offset, $token_length ) = $next_token;93		$stack_depth = count( $this->stack );94 95		// we may have some HTML soup before the next block.96		$leading_html_start = $start_offset > $this->offset ? $this->offset : null;97 98		switch ( $token_type ) {99			case 'no-more-tokens':100				// if not in a block then flush output.101				if ( 0 === $stack_depth ) {102					$this->add_freeform();103					return false;104				}105 106				/*107				 * Otherwise we have a problem108				 * This is an error109				 *110				 * we have options111				 * - treat it all as freeform text112				 * - assume an implicit closer (easiest when not nesting)113				 */114 115				// for the easy case we'll assume an implicit closer.116				if ( 1 === $stack_depth ) {117					$this->add_block_from_stack();118					return false;119				}120 121				/*122				 * for the nested case where it's more difficult we'll123				 * have to assume that multiple closers are missing124				 * and so we'll collapse the whole stack piecewise125				 */126				while ( 0 < count( $this->stack ) ) {127					$this->add_block_from_stack();128				}129				return false;130 131			case 'void-block':132				/*133				 * easy case is if we stumbled upon a void block134				 * in the top-level of the document135				 */136				if ( 0 === $stack_depth ) {137					if ( isset( $leading_html_start ) ) {138						$this->output[] = (array) $this->freeform(139							substr(140								$this->document,141								$leading_html_start,142								$start_offset - $leading_html_start143							)144						);145					}146 147					$this->output[] = (array) new WP_Block_Parser_Block( $block_name, $attrs, array(), '', array() );148					$this->offset   = $start_offset + $token_length;149					return true;150				}151 152				// otherwise we found an inner block.153				$this->add_inner_block(154					new WP_Block_Parser_Block( $block_name, $attrs, array(), '', array() ),155					$start_offset,156					$token_length157				);158				$this->offset = $start_offset + $token_length;159				return true;160 161			case 'block-opener':162				// track all newly-opened blocks on the stack.163				array_push(164					$this->stack,165					new WP_Block_Parser_Frame(166						new WP_Block_Parser_Block( $block_name, $attrs, array(), '', array() ),167						$start_offset,168						$token_length,169						$start_offset + $token_length,