def parse
        reset
        obj = nil
        if @quirks_mode
          while !eos? && skip(IGNORE)
          end
          if eos?
            raise ParserError, "source did not contain any JSON!"
          else
            obj = parse_value
            obj == UNPARSED and raise ParserError, "source did not contain any JSON!"
          end
        else
          until eos?
            case
            when scan(OBJECT_OPEN)
              obj and raise ParserError, "source '#{peek(20)}' not in JSON!"
              @current_nesting = 1
              obj = parse_object
            when scan(ARRAY_OPEN)
              obj and raise ParserError, "source '#{peek(20)}' not in JSON!"
              @current_nesting = 1
              obj = parse_array
            when skip(IGNORE)
              ;
            else
              raise ParserError, "source '#{peek(20)}' not in JSON!"
            end
          end
          obj or raise ParserError, "source did not contain any JSON!"
        end
        obj
      end
Parses the current JSON string _source_ and returns the complete data
structure as a result.