!752

m {

  // subject, object (S/O can be verbs, nouns, anything)

  static class SO {

    S s, o;

    int value; // 1 = asserted as true, -1 = asserted as false

    *(S *s, S *o) {}

    *(S *s, S *o, int *value) {}

    *() {}

    public boolean equals(O _o) {

      if (!(_o instanceof SO)) ret false;

      SO x = cast _o;

      ret eq(s, x.s) && eq(o, x.o);

    }

  }

  static new L<SO> data;

  static void store(S s, S o, int value) {

    data.add(new SO(s, o, value));

  }

  static int query(S s, S o) {

    int i = data.indexOf(new SO(s, o));

    ret i >= 0 ? data.get(i).value : 0;

  }

  static S answer(S s) {

    new Matches m;

    if (match("query * *", s, m))

      ret string(query(m.unq(0), m.unq(1)));

    if (match("assert * *", s, m)) {

      store(m.unq(0), m.unq(1), 1);

      ret "OK.";

    }

    if (match("assertnot * *", s, m)) {

      store(m.unq(0), m.unq(1), -1);

      ret "OK.";

    }

    ret null;

  }

  p {

    store("we can wait", "1 second", 1);

    store("we can wait", "60 seconds", -1);

    assertEq(1, query("we can wait", "1 second"));

    assertEq(-1, query("we can wait", "60 seconds"));

    assertEq(0, query("we can wait", "10 seconds"));

    print("OK!");

  }

}