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

class Opal::SourceMap::File
  include Opal::SourceMap::Map

  attr_reader :fragments
  attr_reader :file
  attr_reader :source

  def initialize(fragments, file, source, generated_code = nil)
    @fragments = fragments
    @file = file
    @source = source
    @names_map = Hash.new { |hash, name| hash[name] = hash.size }
    @generated_code = generated_code
    @absolute_mappings = nil
  end

  def generated_code
    @generated_code ||= @fragments.map(&:cod
    
  def relative_mappings
    @relative_mappings ||= begin
      reference_segment = [0, 0, 0, 0, 0]
      reference_name_index = 0
      absolute_mappings.map do |absolute_mapping|
        # [generated_column, source_index, original_line, original_column, map_name_index]
        reference_segment[0] = 0 # reset the generated_column at each new line

        absolute_mapping.map do |absolute_segment|
          segment = []

          segment[0] = absolute_segment[0] - reference_segment[0]
          segment[1] = absolute_segment[1] - (reference_segment[1] || 0)
          segment[2] = absolute_segment[2] - (reference_segment[2] || 0)
          segment[3] = absolute_segment[3] - (reference_segment[3] || 0)

          # Since [4] can be nil we need to keep track of it in the reference_segment even if it's nil in absolute_segment
          if absolute_segment[4]
            segment[4] = absolute_segment[4].to_int - (reference_segment[4] || reference_name_index).to_int
            reference_name_index = absolute_segment[4]
          end

          reference_segment = absolute_segment
          segment
        end
      end