# The type of line.
	# see: `md_line_*`
	fun line_kind(md: MDLine): Line do
		var value = md.value
		var leading = md.leading
		var trailing = md.trailing
		if md.is_empty then return new LineEmpty
		if md.leading > 3 then return new LineCode
		if value[leading] == '#' then return new LineHeadline
		if value[leading] == '>' then return new LineBlockquote

		if ext_mode then
			if value.length - leading - trailing > 2 then
				if value[leading] == '`' and md.count_chars_start('`') >= 3 then
					return new LineFence
				end
				if value[leading] == '~' and md.count_chars_start('~') >= 3 then
					return new LineFence
				end
			end
		end

		if value.length - leading - trailing > 2 and
		   (value[leading] == '*' or value[leading] == '-' or value[leading] == '_') then
		   if md.count_chars(value[leading]) >= 3 then
				return new LineHR
		   end
		end

		if value.length - leading >= 2 and value[leading + 1] == ' ' then
			var c = value[leading]
			if c == '*' or c == '-' or c == '+' then return new LineUList
		end

		if value.length - leading >= 3 and value[leading].is_digit then
			var i = leading + 1
			while i < value.length and value[i].is_digit do i += 1
			if i + 1 < value.length and value[i] == '.' and value[i + 1] == ' ' then
				return new LineOList
			end
		end

		if value[leading] == '<' and md.check_html then return new LineXML

		var next = md.next
		if next != null and not next.is_empty then
			if next.count_chars('=') > 0 then
				return new LineHeadline1
			end
			if next.count_chars('-') > 0 then
				return new LineHeadline2
			end
		end
		return new LineOther
	end