Method validatePlugboardValue

src/Encoder/Enigma.js:812–839

* Validates plugboard setting value. * @protected * @param {Chain} rawValue * @param {Setting} setting * @return {boolean} Returns true, if value is valid.

(rawValue, setting)

   * @return {boolean} Returns true, if value is valid.
   */
  validatePlugboardValue (rawValue, setting) {
    const plugboard = rawValue.getString()

    // Empty plugboard is valid
    if (plugboard === '') {
      return true
    }

    // Check format (ab cd ef)
    if (plugboard.match(/^([a-z]{2}\s)*([a-z]{2})$/) === null) {
      return {
        key: 'enigmaPlugboardInvalidFormat',
        message:
          'Invalid plugboard format: pairs of letters to be swapped ' +
          'expected (e.g. \'ab cd ef\')'
      }
    }

    // Check if character pairs are unique
    if (!ArrayUtil.isUnique(plugboard.replace(/\s/g, '').split(''))) {
      return {
        key: 'enigmaPlugboardPairsNotUnique',
        message: 'Pairs of letters to be swapped need to be unique'
      }
    }

    return true
  }

  /**
   * Converts plugboard value to rotor wiring string.