public object VisitCallExpr(Expr.Call expr)
{
object callee = Evaluate(expr.callee);
List <object> arguments = new List <object>();
foreach (Expr argument in expr.arguments)
{
arguments.Add(Evaluate(argument));
}
if (!(callee is ICallable))
{
throw new RuntimeError(expr.paren,
"Can only call functions and classes.");
}
ICallable function = (ICallable)callee;
if (arguments.Count != function.Arity())
{
throw new RuntimeError(expr.paren, "Expected " +
function.Arity() + " arguments but got " +
arguments.Count + ".");
}
return(function.Call(this, arguments));
}
public object Visit(Call expr)
{
object callee = Evaluate(expr.callee);
List <object> arguments = new List <object>();
foreach (Expr argument in expr.arguments)
{
arguments.Add(Evaluate(argument));
}
if (!(callee is ICallable))
{
throw new ErrorHandler.RuntimeError(expr.paren, "Can't call this datatype: " + (callee == null ? "null" : callee.ToString()));
}
ICallable called = (ICallable)callee;
if (arguments.Count != called.Arity())
{
throw new ErrorHandler.RuntimeError(expr.paren, "Expected " + called.Arity() + " arguments but received " + arguments.Count);
}
return(called.Call(this, expr.paren, arguments));
}
public object VisitCallExpression(CallExpression expression)
{
object callee = Evaluate(expression.callee);
List <object> arguments = new List <object>();
foreach (IExpression argument in expression.arguments)
{
arguments.Add(Evaluate(argument));
}
// Incorrect call, the calle cannot be called (ie. "some string"() )
if (callee is ICallable == false)
{
throw new RuntimeError(expression.paren, "Can only call functions and classes.");
}
ICallable function = (ICallable)callee;
// Not correct number of arguments
if (arguments.Count != function.Arity())
{
// TODO: Might want to make it like JavaScript where it uses null when not enough, and discards when too many
throw new RuntimeError(expression.paren, $"Expected {function.Arity()} arguments but got {arguments.Count}.");
}
return(function.Call(this, expression, arguments));
}