class Sass::Compiler::Host::Protofier

def from_proto(proto)
  oneof = proto.value
  obj = proto.public_send(oneof)
  case oneof
  when :string
    Sass::Value::String.new(
      obj.text,
      quoted: obj.quoted
    )
  when :number
    Number.from_proto(obj)
  when :color
    obj.to_s if RUBY_ENGINE == 'jruby' # TODO: https://github.com/protocolbuffers/protobuf/issues/18807
    Sass::Value::Color.send(
      :for_space,
      obj.space,
      obj.has_channel1? ? obj.channel1 : nil,
      obj.has_channel2? ? obj.channel2 : nil,
      obj.has_channel3? ? obj.channel3 : nil,
      obj.has_alpha? ? obj.alpha : nil
    )
  when :argument_list
    Sass::Value::ArgumentList.new(
      obj.contents.map do |element|
        from_proto(element)
      end,
      obj.keywords.to_enum.with_object({}) do |(key, value), hash|
        hash[key.to_sym] = from_proto(value)
      end,
      ListSeparator.from_proto(obj.separator)
    ).instance_eval do
      @id = obj.id
      self
    end
  when :list
    Sass::Value::List.new(
      obj.contents.map do |element|
        from_proto(element)
      end,
      separator: ListSeparator.from_proto(obj.separator),
      bracketed: obj.has_brackets
    )
  when :map
    Sass::Value::Map.new(
      obj.entries.to_enum.with_object({}) do |entry, hash|
        hash[from_proto(entry.key)] = from_proto(entry.value)
      end
    )
  when :compiler_function
    Sass::Value::Function.new(nil).instance_eval do
      @id = obj.id
      self
    end
  when :host_function
    raise Sass::ScriptError, 'The compiler may not send Value.host_function to host'
  when :compiler_mixin
    Sass::Value::Mixin.send(:new).instance_eval do
      @id = obj.id
      self
    end
  when :calculation
    Calculation.from_proto(obj)
  when :singleton
    case obj
    when :TRUE
      Sass::Value::Boolean::TRUE
    when :FALSE
      Sass::Value::Boolean::FALSE
    when :NULL
      Sass::Value::Null::NULL
    else
      raise Sass::ScriptError, "Unknown Value.singleton #{obj}"
    end
  else
    raise Sass::ScriptError, "Unknown Value.value #{obj}"
  end
end