mundschenk-at / php-typography

	 * @return \DOMText|null Null if $node is a block-level element or no text sibling exists.

	 */

	private static function get_adjacent_textnode( callable $iterate, callable $get_adjacent_parent, \DOMNode $node = null ) {

		if ( ! isset( $node ) ) {

			return null;

		} elseif ( $node instanceof \DOMElement && isset( self::$block_tags[ $node->tagName ] ) ) {

			return null;

		}

		/**

		 * The result node.

			return null;

		}

		if ( $node instanceof \DOMText ) {

			return $node;

		} elseif ( ! $node instanceof \DOMElement ) {

			// Return null if $node is neither \DOMText nor \DOMElement.

			return null;

		} elseif ( $recursive && isset( self::$block_tags[ $node->tagName ] ) ) {

			return null;

		}

		$edge_textnode = null;