# File lib/json.rb, line 537
537:   def to_json(state = nil, depth = 0)
538:     state = JSON::State.from_state(state)
539:     json_check_circular(state) { json_transform(state, depth) }
540:   end

     # File lib/json.rb, line 544
544:   def json_check_circular(state)
545:     if state
546:       state.seen?(self) and raise JSON::CircularDatastructure,
547:           "circular data structures not supported!"
548:       state.remember self
549:     end
550:     yield
551:   ensure
552:     state and state.forget self
553:   end

     # File lib/json.rb, line 555
555:   def json_shift(state, depth)
556:     state and not state.object_nl.empty? or return ''
557:     state.indent * depth
558:   end

     # File lib/json.rb, line 560
560:   def json_transform(state, depth)
561:     delim = ','
562:     delim << state.object_nl if state
563:     result = '{'
564:     result << state.object_nl if state
565:     result << map { |key,value|
566:       json_shift(state, depth + 1) <<
567:         key.to_s.to_json(state, depth + 1) <<
568:         ':' << state.space << value.to_json(state, depth + 1)
569:     }.join(delim)
570:     result << state.object_nl if state
571:     result << json_shift(state, depth)
572:     result << '}'
573:     result
574:   end