Schlaefer / Saito

			$token =& $parts[1];

			$text =& $parts[2];

			if (empty($token)) {

				# Reached end of text span: empty stack without emitting.

				# any more emphasis.

				while ($token_stack[0]) {

					$text_stack[1] .= array_shift($token_stack);

					$text_stack[0] .= array_shift($text_stack);

				}

				break;

			}

			$token_len = strlen($token);

			if ($tree_char_em) {

			} else if ($token_len == 2) {

				if ($strong) {

					# Unwind any dangling emphasis marker:

					if (strlen($token_stack[0]) == 1) {

						$text_stack[1] .= array_shift($token_stack);

						$text_stack[0] .= array_shift($text_stack);

					}

					# Closing strong marker:

					array_shift($token_stack);

					$span = array_shift($text_stack);