public static IEnumerable <ISymbol> DescendantNodes(this IVisitableSymbol symbol, Func <ISymbol, bool>?visitChildren = null, Func <ISymbol, bool>?includeSymbol = null)
{
var visitor = new CollectAllSymbolsVisitor(
visitChildren ?? (_ => true),
includeSymbol ?? (_ => true));
symbol.Visit(visitor);
return(visitor.Symbols);
}
protected override object DefaultVisit(IVisitableSymbol symbol)
{
if (_includeSymbol(symbol))
{
Symbols.Add(symbol);
}
if (_visitChildren(symbol))
{
return(symbol.Visit(this));
}
return(default);