You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: platform.rb
    path of file: ./repos/unimidi/lib/unimidi
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

module UniMIDI

    
    def platform_lib
      case RUBY_PLATFORM
      when /darwin/ then 'ffi-coremidi'
      when /java/ then 'midi-jruby'
      when /linux/ then 'alsa-rawmidi'
      when /mingw/ then 'midi-winmm'
      end