Method performCharEncodeToBlock

src/Encoder/A1Z26.js:67–84

* Encodes given character to a block. * @protected * @param {number} codePoint Unicode code point * @param {number} index Unicode code point index * @param {Chain} content Content to be encoded * @return {number[]|string|Uint8Array|Chain|null} Encoded block

(codePoint, index, content)

   * @return {number[]|string|Uint8Array|Chain|null} Encoded block
   */
  performCharEncodeToBlock (codePoint, index, content) {
    const caseSensitivity = this.getSettingValue('caseSensitivity')

    let alphabet = this.getSettingValue('alphabet')
    if (!caseSensitivity) {
      alphabet = alphabet.toLowerCase()
    }

    let charIndex = alphabet.indexOfCodePoint(codePoint)
    if (charIndex === -1) {
      return null
    }

    // This is a 1-based index
    charIndex += 1

    return charIndex.toString()
  }

  /**
   * Decodes given block to a character.