public object VisitUnaryExpr(Expr.Unary expr)
{
object right = Evaluate(expr.Right);
// ReSharper disable once SwitchStatementMissingSomeCases
switch (expr.Operator.Type)
{
case MINUS:
CheckNumberOperand(expr.Operator, right);
return(-(double)right);
case BANG:
return(!IsTruthy(right));
}
return(null);
}
public object VisitUnaryExpr(Expr.Unary expr)
{
Resolve(expr.Right);
return(null);
}
public string Visit(Expr.Unary expr)
{
return(Parenthesise(expr.Operator.Lexeme, expr.Right));
}