# Paragraphs parser
class MdParagraphParser
	super MdBlockParser

	redef type BLOCK: MdParagraph

	redef var block = new MdParagraph(location) is lazy

	# Paragraph content
	var content: nullable Buffer = new Buffer

	redef fun try_continue(state) do
		if state.is_blank then return null
		return new MdBlockContinue.at_index(state.index)
	end

	redef fun add_line(line) do
		var content = self.content
		if content == null then return
		if not content.is_empty then
			content.add('\n')
		end
		content.append(line)
	end

	redef fun finalize(parser) do
		super

		var inline_parser = parser.inline_parser
		var content = self.content
		if content == null then return

		var content_string = content.to_s
		var has_reference_defs = false

		var pos = inline_parser.parse_reference(content_string)
		# try parsing the beginning as link reference definitions
		while content_string.length > 3 and content_string.chars[0] == '[' and pos != 0 do
			content_string = content_string.substring(pos, content_string.length - pos)
			has_reference_defs = true
			pos = inline_parser.parse_reference(content_string)
		end

		if has_reference_defs and content_string.is_blank then
			block.unlink
			self.content = null
		else
			self.content = new Buffer.from_text(content_string)
		end
	end

	redef fun parse_inlines(inline_parser) do
		var content = self.content
		if content == null then return
		inline_parser.parse(content.to_s, content_offset, block)

		var last_child = block.last_child
		if last_child != null then
			location.line_end = last_child.location.line_end
			location.column_end = last_child.location.column_end
		end
	end
end