static StringBuilder scoreTextPredictAlgo_buf;

static double scoreTextPredictAlgo(Algorithm algorithm, S text) {
  ret scoreTextPredictAlgo(algorithm, text, 0, 0);
}

static double scoreTextPredictAlgo(Algorithm algorithm, S text,
  int descLength, int pivotLength) {
  long time = now();
  int score = 0;
  int n = l(text);

  for (int pos = 0; pos < n; ) {
    S s = algorithm.predict(n-pos);
    if (empty(s)) s = " "; // We're lenient
    
    if (l(s) > n-pos)
      s = substring(s, 0, n-pos);
    if (scoreTextPredictAlgo_buf != null) scoreTextPredictAlgo_buf.append(s);
    int j = pos+l(s);
    S real = substring(text, pos, j);
    score += getNumberOfEqualCharacters(real, s);
    algorithm.feed(real);
    pos = j;
  }
  
  double score2 = score*100.0/n-lengthPunishment(descLength, pivotLength);
  done_always(time, "SCORE: " + score + "/" + n + " = " + formatDouble(score2, 2) + "%");
  
  if (lastSilentException() != null)
    printStackTrace(lastSilentException());

  ret score2;
}