normalize

# File lib/unicode_normalize/normalize.rb, line 119
  def self.normalize(string, form = :nfc)
    encoding = string.encoding
    case encoding
    when Encoding::UTF_8
      case form
      when :nfc then
        string.gsub REGEXP_C, NF_HASH_C
      when :nfd then
        string.gsub REGEXP_D, NF_HASH_D
      when :nfkc then
        string.gsub(REGEXP_K, KOMPATIBLE_TABLE).gsub(REGEXP_C, NF_HASH_C)
      when :nfkd then
        string.gsub(REGEXP_K, KOMPATIBLE_TABLE).gsub(REGEXP_D, NF_HASH_D)
      else
        raise ArgumentError, "Invalid normalization form #{form}."
      end
    when Encoding::US_ASCII
      string
    when *UNICODE_ENCODINGS
      normalize(string.encode(Encoding::UTF_8), form).encode(encoding)
    else
      raise Encoding::CompatibilityError, "Unicode Normalization not appropriate for #{encoding}"
    end
  end