static LS lambdaMapLike singlePredTok(ICharPred isPartOfToken, S s) {

  new ArrayList<S> tok;

  int l = s == null ? 0 : s.length();

  int i = 0, n = 0;

  while (i < l) {

    int j = i;

    char c;

    // scan for whitespace

    while (j < l) {

      c = s.charAt(j);

      if (isPartOfToken.get(c))

        break;

      else

        ++j;

    }

    tok.add(substring(s, i, j));

    i = j;

    if (i >= l) break;

    // scan for non-whitespace

    do

      ++j;

    while (j < l && isPartOfToken.get(s.charAt(j)));

    tok.add(substring(s, i, j));

    i = j;

  }

  if ((tok.size() % 2) == 0) tok.add("");

  ret tok;

}