Транслитератор кирилического алфавита в латинский и обратно для использования в url

ru-en-url-transliterator.ts

class RuEnUrlTransliterator {
  constructor () {
    this.init()
  }

  private ruEn: Record<string, string> = {}
  private enRu: Record<string, string> = {
    a: 'а',
    b: 'б',
    v: 'в',
    g: 'г',
    d: 'д',
    e: 'е',
    '.yo': 'ё',
    j: 'ж',
    z: 'з',
    i: 'и',
    '.ii': 'й',
    k: 'к',
    l: 'л',
    m: 'м',
    n: 'н',
    o: 'о',
    p: 'п',
    r: 'р',
    s: 'с',
    t: 'т',
    u: 'у',
    f: 'ф',
    h: 'х',
    c: 'ц',
    '.ch': 'ч',
    '.sh': 'ш',
    '.sj': 'щ',
    '.mz': 'ь',
    '.tz': 'ъ',
    y: 'ы',
    '.eh': 'э',
    '.yu': 'ю',
    '.ya': 'я',
    '.cm': ',',
    '-': '-',
    '~': '~',
    0: '0',
    1: '1',
    2: '2',
    3: '3',
    4: '4',
    5: '5',
    6: '6',
    7: '7',
    8: '8',
    9: '9'
  }

  private ruEnSpecial: Record<string, string> = {
    ' ': '_'
  }

  private enRuSpecial: Record<string, string> = {
    _: ' '
  }

  private init () {
    for (const key in this.enRu) {
      const value = this.enRu[key]
      const keyUpperCased = key.toUpperCase()
      const valueUpperCased = value.toUpperCase()
      this.ruEn[value] = key
      this.ruEn[valueUpperCased] = keyUpperCased
      this.enRu[keyUpperCased] = valueUpperCased
    }
  }

  public ruToEn (str: string): string {
    let out = ''
    if (!this.isRuValid(str)) {
      console.error('Invalid value:', str)
      throw new Error('valueInvalid')
    }
    for (let i = 0; i < str.length; i++) {
      const char = this.ruEn[str[i]] || this.ruEnSpecial[str[i]]
      if (char === undefined) throw new Error('unknownChar')
      out += char
    }
    return out
  }

  public enToRu (str: string): string {
    if (!this.isEnValid(str)) {
      console.error('Invalid value:', str)
      throw new Error('valueInvalid')
    }
    let out = ''
    for (let i = 0; i < str.length; i++) {
      let char = this.enRu[str[i]] || this.enRuSpecial[str[i]]
      if (char === undefined) {
        char = this.enRu[str[i] + str[i + 1] + str[i + 2]]
        if (char) {
          i += 2
        }
      }
      if (char === undefined) {
        throw new Error('unknownChar')
      }
      out += char
    }
    return out
  }

  public isRuValid (value: string): boolean {
    return /^[а-яА-ЯёЁ0-9 ,~-]*$/.test(value)
  }

  public isEnValid (value: string): boolean {
    return /^[a-zA-Z0-9._~-]*$/.test(value)
  }
}

/*
const transliterator = new RuEnUrlTransliterator()
const ruOriginal = 'Моторное масло'
const en = transliterator.ruToEn(ruOriginal)
const ruTransliterated = transliterator.enToRu(en) // "Motornoe_maslo"
console.log(ruTransliterated === ruOriginal) // true
*/

const transliterator = new RuEnUrlTransliterator()

export { transliterator }
export default RuEnUrlTransliterator