Boo.Lang.Compiler.TypeSystem.AnonymousCallablesManager.CreateConcreteCallableType C# (CSharp) Method

        private IType CreateConcreteCallableType(Node sourceNode, AnonymousCallableType anonymousType)
        {
            Module module = TypeSystemServices.GetCompilerGeneratedTypesModule();

            TypeMember enclosing = (sourceNode.GetAncestor(NodeType.ClassDefinition) ?? sourceNode.GetAncestor(NodeType.InterfaceDefinition) ?? sourceNode.GetAncestor(NodeType.EnumDefinition) ?? sourceNode.GetAncestor(NodeType.Module)) as TypeMember;
            string prefix = "";
            string postfix = "";
            if(enclosing != null)
            {
                prefix += enclosing.Name;
                enclosing = (sourceNode.GetAncestor(NodeType.Method)
                        ?? sourceNode.GetAncestor(NodeType.Property)
                        ?? sourceNode.GetAncestor(NodeType.Event)
                        ?? sourceNode.GetAncestor(NodeType.Field)) as TypeMember;
                if(enclosing != null)
                {
                    prefix += "_" + enclosing.Name;
                }
                prefix += "$";
            }
            else if (!sourceNode.LexicalInfo.Equals(LexicalInfo.Empty))
            {
                prefix += System.IO.Path.GetFileNameWithoutExtension(sourceNode.LexicalInfo.FileName) + "$";
            }
            if(!sourceNode.LexicalInfo.Equals(LexicalInfo.Empty))
            {
                postfix = "$" + sourceNode.LexicalInfo.Line + "_" + sourceNode.LexicalInfo.Column + postfix;
            }
            string name = "__" + prefix + "callable" + module.Members.Count + postfix + "__";
            ClassDefinition cd = TypeSystemServices.CreateCallableDefinition(name);
            cd.Modifiers |= TypeMemberModifiers.Public;
            cd.LexicalInfo = sourceNode.LexicalInfo;

            cd.Members.Add(CreateInvokeMethod(anonymousType));

            Method beginInvoke = CreateBeginInvokeMethod(anonymousType);
            cd.Members.Add(beginInvoke);

            cd.Members.Add(CreateEndInvokeMethod(anonymousType));
            module.Members.Add(cd);

            CreateCallableTypeBeginInvokeExtensions(anonymousType, beginInvoke);

            return (IType)cd.Entity;
        }