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: ruby_builder.rb
    path of file: ./repos/pg_trunk/lib/pg_trunk/core/operation
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

class PG
    
    def format(value)
      case value
      when Hash   then value
      when String then format_text(value)
      when Array  then format_list(value)
      else value.inspect
      end