def doctype(parent, indent)
      return unless accept :doctype

      buffer = accept(:line_feed)

      parent[@children] << [:doctype, buffer.strip.to_sym, {}, nil, indent]
    end
def doctype(parent, indent)
      return unless accept :doctype

      buffer = accept(:line_feed)

      parent[@children] << [:doctype, buffer.strip.to_sym, {}, nil, indent]
    end
Match one line or multiline comments