!747

m {
  p {
    S input = loadSnippet("#1001519");
    L<S> tok = javaTok(input);
    
    new L out;
    int count = 0;
    for (int i = 0; i < tok.size(); i++) {
      S t = tok.get(i);
      if ((i & 1) == 1 && isOpening(t)) {
        ++count;
        out.addAll(litlist(Color.green, t, Color.white));
      } else if ((i & 1) == 1 && isClosing(t)) {
        --count;
        out.addAll(litlist(Color.blue, t, Color.white));
      } else
        out.add(t);
    }
    
    JTextPane textPane = showColoredText(out);
    S comment = count == 0 ? "Brackets match." : "Bracket match error " + count;
    addCommentToWindow(textPane, comment);
    addSaveButton(textPane, "Marked opening and closing tokens", out);
  }
  
  static boolean isOpening(S s) {
    ret litlist("<", "(", "{", "[").contains(s);
  }
  
  static boolean isClosing(S s) {
    ret litlist(">", ")", "}", "]").contains(s);
  }
}