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: transformer.rb
    path of file: ./repos/codeshift/lib/codeshift
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

require 'parser/current'

module Codeshift
  # Transformer Class
  class Transformer
    def initialize(code, transform)
      @code = code
      @transform = tr
    
    def transform
      eval(@transform)

      buffer        = Parser::Source::Buffer.new('(example)')
      buffer.source = @code
      begin
        temp = Parser::CurrentRuby.parse(@code)
        rewriter = Transform.new

        # Rewrite the AST, returns a String with the new form.
        output = rewriter.rewrite(buffer, temp)
      rescue
        puts 'Unknown parsing error'
        @code
      end