module Vindetta
  class Transliterator
    MAPPING = "0123456789.ABCDEFGH..JKLMN.P.R..STUVWXYZ".split("").freeze

    def self.vin(vin)
      vin.chars.map { |c| run(c) }
    end

    def self.run(character)
      index = MAPPING.find_index(character)
      raise Vindetta::InvalidCharacter, character unless index
      index % 10
    end
  end
end