# ambiguous grammar for online calculator, enum Expr defined in exprtrees.rs
!use crate::exprtrees::*;
!use crate::exprtrees::Expr::*;
absyntype Expr
nonterminal E Expr
terminal + - * ( )
typedterminal int Expr
topsym E
left * 500
left + 400
left - 400
E --> int:n { n }
E --> E:e1 + E:e2 { Plus(bx(e1),bx(e2)) }
E --> E:e1 - E:e2 { Minus(bx(e1),bx(e2)) }
E ==> E:e1 * E:e2
{ Times(bx(e1),bx(e2)) }
<==
E --> - E:e { Negative(bx(e)) }
E --> ( E:e ) { e }
EOF