public static void Main(string[] args)
 {
     Stream inputStream = Console.OpenStandardInput();
     ANTLRInputStream input = new ANTLRInputStream(inputStream);
     CalculatorLexer lexer = new CalculatorLexer(input);
     CommonTokenStream tokens = new CommonTokenStream(lexer);
     CalculatorParser parser = new CalculatorParser(tokens);
     parser.stat();
 }
 public static void Main(string[] args)
 {
     Stream inputStream = Console.OpenStandardInput();
     ANTLRInputStream input = new ANTLRInputStream(inputStream);
     CalculatorLexer lexer = new CalculatorLexer(input);
     CommonTokenStream tokens = new CommonTokenStream(lexer);
     CalculatorParser parser = new CalculatorParser(tokens);
     var tree = parser.stat().Tree;
     Console.WriteLine(tree.ToStringTree());
     DumpTree(tree, "", "  ");
 }