private DocumentNode CreateDelegationQuery(
OperationType operation,
IImmutableStack <SelectionPathComponent> path,
FieldNode requestedField)
{
if (!path.Any())
{
path = path.Push(new SelectionPathComponent(
requestedField.Name,
Array.Empty <ArgumentNode>()));
}
FieldNode current = CreateRequestedField(requestedField, ref path);
while (path.Any())
{
path = path.Pop(out SelectionPathComponent component);
current = CreateSelection(current, component);
}
var usedVariables = new HashSet <string>();
_usedVariables.CollectUsedVariables(current, usedVariables);
_usedVariables.CollectUsedVariables(_fragments, usedVariables);
var definitions = new List <IDefinitionNode>();
definitions.Add(CreateOperation(
_operationName,
operation,
new List <FieldNode> {
current
},
_variables.Where(t =>
usedVariables.Contains(t.Variable.Name.Value))
.ToList()));
definitions.AddRange(_fragments);
return(new DocumentNode(null, definitions));
}