protected object EvaluateFunCallExpr(AstFunCallExpr expr)
{
if (HadErrorOrReturn())
{
return(null);
}
object calleeObj = EvaluateExpr(expr.m_callee);
IFunction callee = calleeObj as IFunction;
if (callee != null)
{
if (expr.m_args.Count != callee.ArgCount())
{
// TODO: print function name in the error
m_runtimeError = true;
Lox.Error(expr.m_startLine, "Function expected " + callee.ArgCount() + " arguments, but was passed " + expr.m_args.Count);
return(null);
}
List <object> args = new List <object>();
foreach (AstExpr argExpr in expr.m_args)
{
args.Add(EvaluateExpr(argExpr));
}
return(callee.Call(this, args));
}
else
{
// TODO: Distinguish between someUnknownFunction() and (3 + 1)() ?
// It would be nice to be able to print the name of the function in the former case
m_runtimeError = true;
Lox.Error(expr.m_startLine, "Invalid function call");
return(null);
}
}
