Method decodeCode

src/Encoder/MorseCode.js:380–393

* Decodes given code to its character representation. * @protected * @param {string} rawCode Morse code unit * @param {string} shortMark * @param {string} longerMark * @param {string} spaceMark * @return {?string} Character or null, if not defined.

(rawCode, shortMark, longerMark, spaceMark)

   * @return {?string} Character or null, if not defined.
   */
  static decodeCode (rawCode, shortMark, longerMark, spaceMark) {
    // Handle space
    if (rawCode === spaceMark) {
      return ' '
    }

    // Translate marks
    const code = MorseCodeEncoder.translateMarks(
      rawCode, [shortMark, longerMark], ['.', '-'])

    // Find code in alphabet
    const index = codeAlphabet.indexOf(code)
    return index !== -1 ? alphabet[index] : null
  }

  /**
   * Runs from start to end through the string and replaces marks.