private void ExtendModelWithRelatedNodesRecursive(IRoslynModelNode roslynModelNode, DirectedModelRelationshipType?directedModelRelationshipType,
CancellationToken cancellationToken, IIncrementalProgress progress, bool recursive, HashSet <ModelNodeId> alreadyDiscoveredNodes)
{
var relatedSymbolPairs = roslynModelNode
.FindRelatedSymbols(_roslynModelProvider, directedModelRelationshipType)
.Select(GetOriginalDefinition)
.Where(i => !IsHidden(i.RelatedSymbol)).ToList();
foreach (var relatedSymbolPair in relatedSymbolPairs)
{
cancellationToken.ThrowIfCancellationRequested();
var relatedSymbol = relatedSymbolPair.RelatedSymbol;
var relatedNode = GetOrAddNode(relatedSymbol, progress);
AddRelationshipIfNotExists(relatedSymbolPair);
if (!recursive)
{
continue;
}
// Avoid infinite loop by stopping recursion when a node is already added.
if (alreadyDiscoveredNodes.Contains(relatedNode.Id))
{
continue;
}
alreadyDiscoveredNodes.Add(relatedNode.Id);
ExtendModelWithRelatedNodesRecursive(relatedNode, directedModelRelationshipType,
cancellationToken, progress, true, alreadyDiscoveredNodes);
}
}