# Split `input` string into `MDLines` and create a parent `MDBlock` with it.
	private fun read_lines(input: String): MDBlock do
		var block = new MDBlock(new MDLocation(1, 1, 1, 1))
		var value = new FlatBuffer
		var i = 0

		var line_pos = 0
		var col_pos = 0

		while i < input.length do
			value.clear
			var pos = 0
			var eol = false
			while not eol and i < input.length do
				col_pos += 1
				var c = input[i]
				if c == '\n' then
					eol = true
				else if c == '\r' then
				else if c == '\t' then
					var np = pos + (4 - (pos & 3))
					while pos < np do
						value.add ' '
						pos += 1
					end
				else
					pos += 1
					value.add c
				end
				i += 1
			end
			line_pos += 1

			var loc = new MDLocation(line_pos, 1, line_pos, col_pos)
			var line = new MDLine(loc, value.write_to_string)
			var is_link_ref = check_link_ref(line)
			# Skip link refs
			if not is_link_ref then block.add_line line
			col_pos = 0
		end
		return block
	end