static LS paragraphsTok(S s) {
  new ArrayList<S> tok;
  int l = s == null ? 0 : s.length();
  int i = 0;
  while (i < l && isSpace(s.charAt(i))) ++i;
  tok.add(substring(s, 0, i));
  
  while true {
    IntRange r = tok_findNextEmptyLineWhitespace(s, i);
    if (r == null) break;
    
    tok.add(substring(s, i, r.start));
    tok.add(substring(s, r));
    i = r.end;
  }
  
  if (i < l) {
    int l2 = l;
    while (l2 > i+1 && isSpace(s.charAt(l2-1))) --l2;
    tok.add(substring(s, i, l2));
    tok.add(substring(s, l2));
  }  
  ret tok;
}

Began life as a copy of #1003360