new

# File ext/psych/lib/psych/visitors/yaml_tree.rb, line 56
      def initialize emitter, ss, options
        super()
        @started    = false
        @finished   = false
        @emitter    = emitter
        @st         = Registrar.new
        @ss         = ss
        @options    = options
        @line_width = options[:line_width]
        if @line_width && @line_width < 0
          if @line_width == -1
            # Treat -1 as unlimited line-width, same as libyaml does.
            @line_width = nil
          else
            fail(ArgumentError, "Invalid line_width #{@line_width}, must be non-negative or -1 for unlimited.")
          end
        end
        @coders     = []

        @dispatch_cache = Hash.new do |h,klass|
          method = "visit_#{(klass.name || '').split('::').join('_')}"

          method = respond_to?(method) ? method : h[klass.superclass]

          raise(TypeError, "Can't dump #{target.class}") unless method

          h[klass] = method
        end
      end