public override bool CheckInvocation(TexlBinding binding, TexlNode[] args, DType[] argTypes, IErrorContainer errors, out DType returnType, out Dictionary <TexlNode, DType> nodeToCoercedTypeMap)
{
Contracts.AssertValue(args);
Contracts.AssertAllValues(args);
Contracts.AssertValue(argTypes);
Contracts.Assert(args.Length == 2);
Contracts.Assert(argTypes.Length == 2);
Contracts.AssertValue(errors);
if (!base.CheckInvocation(binding, args, argTypes, errors, out returnType, out nodeToCoercedTypeMap))
{
return(false);
}
// Check if first argument is poly type or an activity pointer
if (!argTypes[0].IsPolymorphic && !argTypes[0].IsActivityPointer)
{
errors.EnsureError(DocumentErrorSeverity.Severe, args[0], TexlStrings.ErrBadType_ExpectedType_ProvidedType, DKind.Polymorphic.ToString(), argTypes[0].GetKindString());
return(false);
}
// Check if table arg referrs to a connected data source.
TexlNode tableArg = args[1];
FirstNameInfo tableInfo;
IExternalDataSource tableDsInfo;
if (!binding.TryGetFirstNameInfo(tableArg.Id, out tableInfo) ||
(tableDsInfo = (tableInfo.Data as IExternalDataSource)) == null ||
!(tableDsInfo is IExternalTabularDataSource))
{
errors.EnsureError(tableArg, TexlStrings.ErrAsTypeAndIsTypeExpectConnectedDataSource);
return(false);
}
if (binding.Document.Properties.EnabledFeatures.IsEnhancedDelegationEnabled && (tableDsInfo is IExternalCdsDataSource) && argTypes[0].HasPolymorphicInfo)
{
var expandInfo = argTypes[0].PolymorphicInfo.TryGetExpandInfo(tableDsInfo.TableMetadata.Name);
if (expandInfo != null)
{
returnType = argTypes[0].ExpandPolymorphic(argTypes[1], expandInfo);
return(true);
}
}
returnType = argTypes[1].ToRecord();
return(true);
}
