# Parser for a specific block node
abstract class MdBlockParser

	# Kind of block under construction
	type BLOCK: MdBlock

	# MdBlock under construction
	fun block: BLOCK is abstract

	# Line Start
	var line_start: Int

	# Column start
	var column_start: Int

	# Location at start
	#
	# The location end it initialized at `-1` and will be set later in the
	# `finalize` method.
	var location: MdLocation is lazy do return new MdLocation(line_start, column_start, -1, -1)

	# Column where the content starts
	var content_offset: Int

	# Initialize the current `block`
	fun initialize(parser: MdParser) do end

	# Can `self` continue from the current `index` in `parser`?
	#
	# Return a new `MdBlockContinue` if `self` can continue parsing.
	# Return null otherwise.
	fun try_continue(state: MdParser): nullable MdBlockContinue is abstract

	# Add `line` to the current `block`
	fun add_line(line: String) do end

	# Finalize the current `block`
	#
	# Deactivate `self` from `parser` and call `close_block`.
	fun finalize(parser: MdParser) do
		if parser.active_block_parser == self then
			parser.deactivate_block_parser
		end
	end

	# Parse `block` lines
	fun parse_inlines(inline_parser: MdInlineParser) do end
end