inverted

# File actionpack/lib/action_dispatch/journey/nfa/transition_table.rb, line 141
          def inverted
            return @inverted if @inverted

            @inverted = Hash.new { |h, from|
              h[from] = Hash.new { |j, s| j[s] = [] }
            }

            @table.each { |to, hash|
              hash.each { |from, sym|
                if sym
                  sym = Nodes::Symbol === sym ? sym.regexp : sym.left
                end

                @inverted[from][sym] << to
              }
            }

            @inverted
          end