@Override public Value apply(Spreadsheet s, List<Expression> args) { if (args.size() == 0) { System.out.println(HelpSystem.mainHelpMessage()); } else if (args.size() == 1) { System.out.println( HelpSystem.helpMessage(((pw.qxczv.TextExcel.AST.Identifier) (args.get(0))).nm)); } return null; }