Module: Ibandit::CheckDigit

Defined in:
lib/ibandit/check_digit.rb

Class Method Summary collapse

Class Method Details

.belgian(string) ⇒ Object

Currently unused in this gem. This method calculates the last two digits of a Belgian account number when given the first ten digits.



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# File 'lib/ibandit/check_digit.rb', line 64

def self.belgian(string)
  remainder = string.to_i % 97
  format('%02d', remainder)
end

.dutch(string) ⇒ Object

Currently unused in this gem. This method calculates the last digit of a Dutch account number when given the first nine digits.



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# File 'lib/ibandit/check_digit.rb', line 122

def self.dutch(string)
  scaled_values = string.reverse.chars.map.with_index do |char, index|
    unless char.to_i.to_s == char
      raise InvalidCharacterError,
            "Unexpected non-numeric character '#{char}'"
    end

    char.to_i * (index + 2)
  end

  result = 11 - scaled_values.inject(:+) % 11
  result < 10 ? result.to_s : (11 - result).to_s
end

.estonian(string) ⇒ Object

Currently unused in this gem. This method calculates the last digit of a Estonian account number when given the initial digits.



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# File 'lib/ibandit/check_digit.rb', line 71

def self.estonian(string)
  weights = [7, 3, 1]

  scaled_values = string.reverse.chars.map.with_index do |char, index|
    unless char.to_i.to_s == char
      raise InvalidCharacterError,
            "Unexpected non-numeric character '#{char}'"
    end

    char.to_i * weights[index % weights.size]
  end

  (scaled_values.inject(:+) % 10).to_s
end

.iban(country_code, bban) ⇒ Object 



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# File 'lib/ibandit/check_digit.rb', line 162

def self.iban(country_code, bban)
  mod_97_10(bban + country_code)
end

.italian(string) ⇒ Object 



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# File 'lib/ibandit/check_digit.rb', line 35

def self.italian(string)
  odd_mapping = {
    'A' => 1,  'B' => 0,  'C' => 5,  'D' => 7,  'E' => 9,  'F' => 13,
    'G' => 15, 'H' => 17, 'I' => 19, 'J' => 21, 'K' => 2,  'L' => 4,
    'M' => 18, 'N' => 20, 'O' => 11, 'P' => 3,  'Q' => 6,  'R' => 8,
    'S' => 12, 'T' => 14, 'U' => 16, 'V' => 10, 'W' => 22, 'X' => 25,
    'Y' => 24, 'Z' => 23, '0' => 1,  '1' => 0,  '2' => 5,  '3' => 7,
    '4' => 9,  '5' => 13, '6' => 15, '7' => 17, '8' => 19, '9' => 21
  }

  scaled_values = string.chars.map.with_index do |char, index|
    if index.even?
      odd_mapping[char]
    else
      case char.ord
      when 48..57 then char.to_i         # 0..9
      when 65..90 then char.ord - 65     # A..Z
      else
        raise InvalidCharacterError,
              "Unexpected non-alphanumeric character '#{char}'"
      end
    end
  end

  (scaled_values.inject(:+) % 26 + 65).chr
end

.lund(string) ⇒ Object

Currently unused in this gem. This method calculates the last digit of a Finnish account number when given the initial digits (in electronic format).



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# File 'lib/ibandit/check_digit.rb', line 139

def self.lund(string)
  weights = [2, 1]

  scaled_values = string.reverse.chars.map.with_index do |char, index|
    unless char.to_i.to_s == char
      raise InvalidCharacterError,
            "Unexpected non-numeric character '#{char}'"
    end

    scaled_value = char.to_i * weights[index % weights.size]
    scaled_value < 10 ? scaled_value : scaled_value % 10 + 1
  end

  (10 - scaled_values.inject(:+) % 10).to_s
end

.mod_97_10(string) ⇒ Object 



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# File 'lib/ibandit/check_digit.rb', line 3

def self.mod_97_10(string)
  chars = string + '00'
  digits = chars.bytes.map do |byte|
    case byte
    when 48..57 then byte.chr           # 0..9
    when 65..90 then (byte - 55).to_s   # A..Z
    else
      raise InvalidCharacterError,
            "Unexpected non-alphanumeric character '#{byte.chr}'"
    end
  end
  remainder = digits.join.to_i % 97
  format('%02d', 98 - remainder)
end

.rib(bank_code, branch_code, account_number) ⇒ Object 



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# File 'lib/ibandit/check_digit.rb', line 155

def self.rib(bank_code, branch_code, )
  remainder = 97 - (89 * rib_value(bank_code) +
                    15 * rib_value(branch_code) +
                    3 * rib_value()) % 97
  format('%02d', remainder)
end

.rib_value(string) ⇒ Object 



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# File 'lib/ibandit/check_digit.rb', line 166

def self.rib_value(string)
  rib_mapping = {
    'A' => 1, 'B' => 2, 'C' => 3, 'D' => 4, 'E' => 5, 'F' => 6, 'G' => 7,
    'H' => 8, 'I' => 9, 'J' => 1, 'K' => 2, 'L' => 3, 'M' => 4, 'N' => 5,
    'O' => 6, 'P' => 7, 'Q' => 8, 'R' => 9, 'S' => 2, 'T' => 3, 'U' => 4,
    'V' => 5, 'W' => 6, 'X' => 7, 'Y' => 8, 'Z' => 9, '0' => 0, '1' => 1,
    '2' => 2, '3' => 3, '4' => 4, '5' => 5, '6' => 6, '7' => 7, '8' => 8,
    '9' => 9
  }

  string.chars.map do |character|
    unless rib_mapping[character]
      raise InvalidCharacterError, "Unexpected byte '#{character}' in RIB"
    end
    rib_mapping[character]
  end.join.to_i
end

.slovakian_basic(string) ⇒ Object

Currently unused in this gem. This method calculates the last digit of a Slovakian account number prefix when given the initial digits.



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# File 'lib/ibandit/check_digit.rb', line 105

def self.slovakian_basic(string)
  weights = [6, 3, 7, 9, 10, 5, 8, 4, 2]

  scaled_values = string.chars.map.with_index do |char, index|
    unless char.to_i.to_s == char
      raise InvalidCharacterError,
            "Unexpected non-numeric character '#{char}'"
    end

    char.to_i * weights[index]
  end

  (11 - scaled_values.inject(:+) % 11).to_s
end

.slovakian_prefix(string) ⇒ Object

Currently unused in this gem. This method calculates the last digit of a Slovakian account number (basic) when given the initial digits.



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# File 'lib/ibandit/check_digit.rb', line 88

def self.slovakian_prefix(string)
  weights = [10, 5, 8, 4, 2]

  scaled_values = string.chars.map.with_index do |char, index|
    unless char.to_i.to_s == char
      raise InvalidCharacterError,
            "Unexpected non-numeric character '#{char}'"
    end

    char.to_i * weights[index]
  end

  (11 - scaled_values.inject(:+) % 11).to_s
end

.spanish(string) ⇒ Object

Currently unused in this gem. This method calculates a mod 11 check digit from the string of digits passed in. These check digits are used in the 1st and 2nd digits of local Spanish account numbers.



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# File 'lib/ibandit/check_digit.rb', line 22

def self.spanish(string)
  padded_string = string.rjust(10, '0')
  scaled_values = padded_string.chars.map.with_index do |digit, index|
    unless digit.to_i.to_s == digit
      raise InvalidCharacterError,
            "Unexpected non-numeric character '#{digit}'"
    end
    Integer(digit) * (2**index % 11)
  end
  result = 11 - scaled_values.inject(:+) % 11
  result < 10 ? result.to_s : (11 - result).to_s
end