# Append standard text to the current block
	#
	# Read `text` between `begin_index` and `end_index`.
	private fun append_text(text: String, begin_index, end_index: nullable Int): MdText do
		var node: MdText
		if begin_index != null and end_index != null then
			var nb_chars = end_index - begin_index
			var string = text.substring(begin_index, nb_chars)
			node = new MdText(
				new MdLocation(
					line,
					column,
					line,
					column + nb_chars - 1
				), string)
		else
			node = new MdText(
				new MdLocation(
					line,
					column,
					line,
					column + text.length
				), text)
		end
		append_node(node)
		return node
	end