set-phoneme-length.es6

import {combinedPhonemeLengthTable} from './tables.es6';

/**
 * change phoneme length dependent on stress
 *
 * @param {getPhoneme}    getPhoneme Callback for retrieving phonemes.
 * @param {getPhonemeStress} getStress  Callback for retrieving phoneme length.
 * @param {setPhonemeLength} setLength  Callback for setting phoneme length.
 *
 * @return undefined
 */
export const SetPhonemeLength = (getPhoneme, getStress, setLength) => {
  let position = 0;
  let phoneme;
  while((phoneme = getPhoneme(position)) !== null) {
    let stress = getStress(position);
    if ((stress === 0) || (stress > 0x7F)) {
      setLength(position, combinedPhonemeLengthTable[phoneme] & 0xFF);
    } else {
      setLength(position, (combinedPhonemeLengthTable[phoneme] >> 8));
    }
    position++;
  }
}