deserialize

# File ext/psych/lib/psych/visitors/to_ruby.rb, line 46
      def deserialize o
        if klass = resolve_class(Psych.load_tags[o.tag])
          instance = klass.allocate

          if instance.respond_to?(:init_with)
            coder = Psych::Coder.new(o.tag)
            coder.scalar = o.value
            instance.init_with coder
          end

          return instance
        end

        return o.value if o.quoted
        return @ss.tokenize(o.value) unless o.tag

        case o.tag
        when '!binary', 'tag:yaml.org,2002:binary'
          o.value.unpack('m').first
        when /^!(?:str|ruby\/string)(?::(.*))?$/, 'tag:yaml.org,2002:str'
          klass = resolve_class($1)
          if klass
            klass.allocate.replace o.value
          else
            o.value
          end
        when '!ruby/object:BigDecimal'
          require 'bigdecimal' unless defined? BigDecimal
          class_loader.big_decimal._load o.value
        when "!ruby/object:DateTime"
          class_loader.date_time
          require 'date' unless defined? DateTime
          @ss.parse_time(o.value).to_datetime
        when '!ruby/encoding'
          ::Encoding.find o.value
        when "!ruby/object:Complex"
          class_loader.complex
          Complex(o.value)
        when "!ruby/object:Rational"
          class_loader.rational
          Rational(o.value)
        when "!ruby/class", "!ruby/module"
          resolve_class o.value
        when "tag:yaml.org,2002:float", "!float"
          Float(@ss.tokenize(o.value))
        when "!ruby/regexp"
          klass = class_loader.regexp
          o.value =~ /^\/(.*)\/([mixn]*)$/
          source  = $1
          options = 0
          lang    = nil
          ($2 || '').split('').each do |option|
            case option
            when 'x' then options |= Regexp::EXTENDED
            when 'i' then options |= Regexp::IGNORECASE
            when 'm' then options |= Regexp::MULTILINE
            when 'n' then options |= Regexp::NOENCODING
            else lang = option
            end
          end
          klass.new(*[source, options, lang].compact)
        when "!ruby/range"
          klass = class_loader.range
          args = o.value.split(/([.]{2,3})/, 2).map { |s|
            accept Nodes::Scalar.new(s)
          }
          args.push(args.delete_at(1) == '...')
          klass.new(*args)
        when /^!ruby\/sym(bol)?:?(.*)?$/
          class_loader.symbolize o.value
        else
          @ss.tokenize o.value
        end
      end