# Block parser factory for a block node for determining when a block starts
abstract class MdBlockParserFactory

	# Can the associated block parser can start at the current line in `parser`?
	#
	# Return a new `MdBlockStart` if the block parser can start.
	# Return null otherwise.
	fun try_start(parser: MdParser, matched_block_parser: MdBlockParser):
		nullable MdBlockStart is abstract
end