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: builder.rb
    path of file: ./repos/stackneveroverflow/vendor/bundle/ruby/2.3.0/gems/actionpack-5.0.3/lib/action_dispatch/journey/nfa
    
    the code of the file until where you have to start completion: require 'action_dispatch/journey/nfa/transition_table'
require 'action_dispatch/journey/gtg/transition_table'

module ActionDispatch
  module Journey # :nodoc:
    module NFA # :nodoc:
      class Visitor < Visitors::Visitor # :nodoc:
        def init
    
        def visit_OR(node)
          from = @i += 1
          children = node.children.map { |c| visit(c) }
          to   = @i += 1

          children.each do |child|
            @tt[from, child.first] = nil
            @tt[child.last, to]    = nil
          end

          @tt.accepting = to

          [from, to]
        end