Function phonemize

kokoro.js/src/phonemize.js:174–204

(text, language = "a", norm = true)

 * @returns {Promise<string>} The phonemized text
 */
export async function phonemize(text, language = "a", norm = true) {
  // 1. Normalize text
  if (norm) {
    text = normalize_text(text);
  }

  // 2. Split into chunks, to ensure we preserve punctuation
  const sections = split(text, PUNCTUATION_PATTERN);

  // 3. Convert each section to phonemes
  const lang = language === "a" ? "en-us" : "en";
  const ps = (await Promise.all(sections.map(async ({ match, text }) => (match ? text : (await espeakng(text, lang)).join(" "))))).join("");

  // 4. Post-process phonemes
  let processed = ps
    // https://en.wiktionary.org/wiki/kokoro#English
    .replace(/kəkˈoːɹoʊ/g, "kˈoʊkəɹoʊ")
    .replace(/kəkˈɔːɹəʊ/g, "kˈəʊkəɹəʊ")
    .replace(/ʲ/g, "j")
    .replace(/r/g, "ɹ")
    .replace(/x/g, "k")
    .replace(/ɬ/g, "l")
    .replace(/(?<=[a-zɹː])(?=hˈʌndɹɪd)/g, " ")
    .replace(/ z(?=[;:,.!?¡¿—…"«»“” ]|$)/g, "z");

  // 5. Additional post-processing for American English
  if (language === "a") {
    processed = processed.replace(/(?<=nˈaɪn)ti(?!ː)/g, "di");
  }
  return processed.trim();
}