// Typecheck an invocation of Table.
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 == argTypes.Length);
Contracts.AssertValue(errors);
Contracts.Assert(MinArity <= args.Length && args.Length <= MaxArity);
bool isValid = base.CheckInvocation(args, argTypes, errors, out returnType, out nodeToCoercedTypeMap);
Contracts.Assert(returnType.IsTable);
// Ensure that all args (if any) are records with compatible schemas.
DType rowType = DType.EmptyRecord;
for (int i = 0; i < argTypes.Length; i++)
{
DType argType = argTypes[i];
if (!argType.IsRecord)
{
errors.EnsureError(DocumentErrorSeverity.Severe, args[i], TexlStrings.ErrNeedRecord);
isValid = false;
}
else if (!rowType.CanUnionWith(argType))
{
errors.EnsureError(DocumentErrorSeverity.Severe, args[i], TexlStrings.ErrIncompatibleRecord);
isValid = false;
}
else
{
bool isUnionError = false;
rowType = DType.Union(ref isUnionError, rowType, argType);
Contracts.Assert(!isUnionError);
Contracts.Assert(rowType.IsRecord);
}
}
Contracts.Assert(rowType.IsRecord);
returnType = rowType.ToTable();
return(isValid);
}