public bool IsDelegationSupportedByColumn(DPath columnPath, DelegationCapability delegationCapability)
{
Contracts.AssertValid(columnPath);
// Only the first part of the path can have been renamed
string logicalName;
if (DType.TryGetLogicalNameForColumn(_tableSchema, columnPath[0], out logicalName))
{
var renamedColumnPath = DPath.Root;
renamedColumnPath = renamedColumnPath.Append(new DName(logicalName));
for (int i = 1; i < columnPath.Length; ++i)
{
renamedColumnPath = renamedColumnPath.Append(new DName(columnPath[i]));
}
columnPath = renamedColumnPath;
}
DelegationCapability columnCapabilities;
return(TryGetColumnCapabilities(columnPath, out columnCapabilities) && columnCapabilities.HasCapability(delegationCapability.Capabilities));
}
public override bool CheckInvocation(TexlBinding binding, TexlNode[] args, DType[] argTypes, IErrorContainer errors, out DType returnType, out Dictionary <TexlNode, DType> nodeToCoercedTypeMap)
{
Contracts.AssertValue(args);
Contracts.AssertValue(argTypes);
Contracts.Assert(args.Length == argTypes.Length);
Contracts.AssertValue(errors);
Contracts.Assert(MinArity <= args.Length && args.Length <= MaxArity);
bool fArgsValid = base.CheckInvocation(args, argTypes, errors, out returnType, out nodeToCoercedTypeMap);
// The first arg determines the scope type for the lambda params, and the return type.
DType typeScope;
fArgsValid &= ScopeInfo.CheckInput(args[0], argTypes[0], errors, out typeScope);
Contracts.Assert(typeScope.IsRecord);
// The result type has N additional columns, as specified by (args[1],args[2]), (args[3],args[4]), ... etc.
returnType = typeScope.ToTable();
int count = args.Length;
if ((count & 1) == 0)
{
errors.EnsureError(DocumentErrorSeverity.Severe, args[0].Parent.CastList().Parent.CastCall(), TexlStrings.ErrBadArityOdd, count);
}
for (var i = 1; i < count; i += 2)
{
TexlNode nameArg = args[i];
DType nameArgType = argTypes[i];
// Verify we have a string literal for the column name. Accd to spec, we don't support
// arbitrary expressions that evaluate to string values, because these values contribute to
// type analysis, so they need to be known upfront (before AddColumns executes).
StrLitNode nameNode;
if (nameArgType.Kind != DKind.String ||
(nameNode = nameArg.AsStrLit()) == null)
{
fArgsValid = false;
errors.EnsureError(DocumentErrorSeverity.Severe, nameArg, TexlStrings.ErrExpectedStringLiteralArg_Name, nameArg.ToString());
continue;
}
// Verify that the name is valid.
if (!DName.IsValidDName(nameNode.Value))
{
fArgsValid = false;
errors.EnsureError(DocumentErrorSeverity.Severe, nameArg, TexlStrings.ErrArgNotAValidIdentifier_Name, nameNode.Value);
continue;
}
DName columnName = new DName(nameNode.Value);
string colName;
if (DType.TryGetDisplayNameForColumn(typeScope, columnName, out colName))
{
columnName = new DName(colName);
}
// Verify that the name doesn't already exist as either a logical or display name
DType columnType;
string unused;
if (typeScope.TryGetType(columnName, out columnType) || DType.TryGetLogicalNameForColumn(typeScope, columnName, out unused))
{
fArgsValid = false;
errors.EnsureError(DocumentErrorSeverity.Moderate, nameArg, TexlStrings.ErrColExists_Name, columnName);
continue;
}
if (i + 1 >= count)
{
break;
}
columnType = argTypes[i + 1];
// Augment the result type to include the specified column, and verify that it
// hasn't been specified already within the same invocation.
bool fError = false;
returnType = returnType.Add(ref fError, DPath.Root, columnName, columnType);
if (fError)
{
fArgsValid = false;
errors.EnsureError(DocumentErrorSeverity.Moderate, nameArg, TexlStrings.ErrColConflict_Name, columnName);
continue;
}
}
return(fArgsValid);
}