object Expr.IVisitor <object> .VisitUnaryExpr(Expr.Unary expr)
{
object right = Evaluate(expr.right);
switch (expr.op.type)
{
case TokenType.BANG:
return(!IsTruthy(right));
case TokenType.MINUS:
return(-(double)right);
}
return(null);
}
public object VisitUnaryExpr(Expr.Unary expr)
{
var right = Evaluate(expr.Right);
switch (expr.Op.Type)
{
case BANG:
return(!IsTruthy(right));
case MINUS:
CheckNumberOperand(expr.Op, right);
return(-(double)right);
}
return(null);
}
public object VisitUnary(Expr.Unary expr)
{
var right = Evaluate(expr.Right);
switch (expr.Op.Type)
{
case TokenType.Bang:
return(!IsTruthy(right));
case TokenType.Minus:
AssertNumberOperand(expr.Op, right);
return(-(double)right);
}
throw new NotSupportedException();
}
public string VisitUnary(Expr.Unary expr)
{
return(Parenthesize(expr.Op.Lexeme, expr.Right));
}
public object VisitUnaryExpr(Expr.Unary expr)
{
Resolve(expr.Right);
return(null);
}
public Unit VisitUnary(Expr.Unary expr)
{
Resolve(expr.Right);
return(Unit.Default);
}
public Void Visit(Expr.Unary expr)
{
Resolve(expr.Right);
return(Void.Instance);
}
object Expr.IVisitor <object> .VisitUnaryExpr(Expr.Unary expr)
{
Resolve(expr.right);
return(null);
}
