public object VisitUnaryExpr(Expr.Unary expr)
{
var right = Evaluate(expr.Right);
switch (expr.Operator.Type)
{
case BANG:
return(!IsTruthy(right));
case MINUS:
return(-(double)right);
}
// Unreachable.
return(null);
}
public string VisitUnaryExpr(Expr.Unary expr)
{
return(Parenthesize(expr.Operator.Lexeme, expr.Right));
}
public object VisitUnaryExpr(Expr.Unary expr)
{
Resolve(expr.Right);
return(null);
}
