private Expr Unary()
{
if (Match(out Token op, BANG, MINUS))
{
Expr right = Unary();
Expr expr = new Expr.Unary(op, right);
return(expr);
}
return(Call());
}
public object visitUnaryExpr(Expr.Unary expr)
{
object right = evaluate(expr.right);
switch (expr.op.type)
{
case TokenType.MINUS:
checkNumberOperand(expr.op, right);
return(-(double)right);
case TokenType.BANG:
return(!isTruthy(right));
}
// Unreachable.
return(null);
}
public object VisitUnaryExpr(Expr.Unary expr)
{
var right = Evaluate(expr.Right);
switch (expr.Operator.Type)
{
case BANG:
return(!IsTruthy(right));
case MINUS:
CheckNumberOperand(expr.Operator, right);
return(-(double)right);
}
// Unreachable
return(null);
}
public object VisitUnaryExpr(Expr.Unary expr)
{
object right = Evaluate(expr.right);
switch (expr.op.type)
{
case BANG:
return(!IsTruthy(right));
case MINUS:
TypeCheckNumberOperand(expr.op, right);
return(-(double)right);
}
// Unreachable.
return(null);
}
public string VisitUnaryExpr(Expr.Unary expr) => Parenthesize(expr.Operator.Lexeme, expr.Right);
public string VisitUnaryExpr(Expr.Unary expr)
{
return(Parenthesize([email protected], expr.right));
}
public string visitUnaryExpr(Expr.Unary expr)
{
return(parenthesize(expr.op.lexeme, expr.right));
}
public object VisitUnaryExpr(Expr.Unary expr)
{
Resolve(expr.right);
return(null);
}
public Void VisitUnaryExpr(Expr.Unary expr)
{
Resolve(expr.Right);
return(null);
}