import Ostap;
import Expr;

local a   = token ("a"),
      add = token ("+") @ lift (fun (l, r) {Add (l, r)}),
      sub = token ("-") @ lift (fun (l, r) {Sub (l, r)}),
      mul = token ("*") @ lift (fun (l, r) {Mul (l, r)}),
      div = token ("/") @ lift (fun (l, r) {Div (l, r)}),      
      exp = expr ({{add, sub}, {mul, div}}, a);

printf ("%s\n", parseString (exp |> bypass (eof), "a").string);
printf ("%s\n", parseString (exp |> bypass (eof), "a+a").string);
printf ("%s\n", parseString (exp |> bypass (eof), "a-a").string);
printf ("%s\n", parseString (exp |> bypass (eof), "a+a-a").string);
printf ("%s\n", parseString (exp |> bypass (eof), "a+a*a").string);
printf ("%s\n", parseString (exp |> bypass (eof), "a*a-a/a").string)