void AddTypesAndNamespaces(CompletionDataWrapper wrapper, CSharpResolver state, AstNode node, Func<IType, IType> typePred = null, Predicate<IMember> memberPred = null, Action<ICompletionData, IType> callback = null, bool onlyAddConstructors = false)
        {
            var lookup = new MemberLookup(ctx.CurrentTypeDefinition, Compilation.MainAssembly);

            if (currentType != null) {
                for (var ct = ctx.CurrentTypeDefinition; ct != null; ct = ct.DeclaringTypeDefinition) {
                    foreach (var nestedType in ct.GetNestedTypes ()) {
                        if (!lookup.IsAccessible (nestedType.GetDefinition (), true))
                            continue;
                        if (onlyAddConstructors) {
                            if (!nestedType.GetConstructors().Any(c => lookup.IsAccessible(c, true)))
                                continue;
                        }

                        if (typePred == null) {
                            if (onlyAddConstructors)
                                wrapper.AddConstructors (nestedType, false, IsAttributeContext(node));
                            else
                                wrapper.AddType(nestedType, false, IsAttributeContext(node));
                            continue;
                        }

                        var type = typePred(nestedType);
                        if (type != null) {
                            var a2 = onlyAddConstructors ? wrapper.AddConstructors(type, false, IsAttributeContext(node)) : wrapper.AddType(type, false, IsAttributeContext(node));
                            if (a2 != null && callback != null) {
                                callback(a2, type);
                            }
                        }
                        continue;
                    }
                }

                if (this.currentMember != null && !(node is AstType)) {
                    var def = ctx.CurrentTypeDefinition;
                    if (def == null && currentType != null)
                        def = Compilation.MainAssembly.GetTypeDefinition(currentType.FullTypeName);
                    if (def != null) {
                        bool isProtectedAllowed = true;

                        foreach (var member in def.GetMembers (m => currentMember.IsStatic ? m.IsStatic : true)) {
                            if (member is IMethod && ((IMethod)member).FullName == "System.Object.Finalize") {
                                continue;
                            }
                            if (member.SymbolKind == SymbolKind.Operator) {
                                continue;
                            }
                            if (member.IsExplicitInterfaceImplementation) {
                                continue;
                            }
                            if (!lookup.IsAccessible(member, isProtectedAllowed)) {
                                continue;
                            }
                            if (memberPred == null || memberPred(member)) {
                                wrapper.AddMember(member);
                            }
                        }
                        var declaring = def.DeclaringTypeDefinition;
                        while (declaring != null) {
                            foreach (var member in declaring.GetMembers (m => m.IsStatic)) {
                                if (memberPred == null || memberPred(member)) {
                                    wrapper.AddMember(member);
                                }
                            }
                            declaring = declaring.DeclaringTypeDefinition;
                        }
                    }
                }
                if (ctx.CurrentTypeDefinition != null) {
                    foreach (var p in ctx.CurrentTypeDefinition.TypeParameters) {
                        wrapper.AddTypeParameter(p);
                    }
                }
            }
            var scope = ctx.CurrentUsingScope;

            for (var n = scope; n != null; n = n.Parent) {
                foreach (var pair in n.UsingAliases) {
                    wrapper.AddAlias(pair.Key);
                }
                foreach (var alias in n.ExternAliases) {
                    wrapper.AddAlias(alias);
                }
                foreach (var u in n.Usings) {
                    foreach (var type in u.Types) {
                        if (!lookup.IsAccessible(type, false))
                            continue;

                        IType addType = typePred != null ? typePred(type) : type;

                        if (onlyAddConstructors && addType != null) {
                            if (!addType.GetConstructors().Any(c => lookup.IsAccessible(c, true)))
                                continue;
                        }

                        if (addType != null) {
                            var a = onlyAddConstructors ? wrapper.AddConstructors(addType, false, IsAttributeContext(node)) : wrapper.AddType(addType, false, IsAttributeContext(node));
                            if (a != null && callback != null) {
                                callback(a, type);
                            }
                        }
                    }
                }

                foreach (var type in n.Namespace.Types) {
                    if (!lookup.IsAccessible(type, false))
                        continue;
                    IType addType = typePred != null ? typePred(type) : type;

                    if (onlyAddConstructors && addType != null) {
                        if (!addType.GetConstructors().Any(c => lookup.IsAccessible(c, true)))
                            continue;
                    }

                    if (addType != null) {
                        var a2 = onlyAddConstructors ? wrapper.AddConstructors(addType, false, IsAttributeContext(node)) : wrapper.AddType(addType, false);
                        if (a2 != null && callback != null) {
                            callback(a2, type);
                        }
                    }
                }

                foreach (var curNs in n.Namespace.ChildNamespaces) {
                    wrapper.AddNamespace(lookup, curNs);
                }
            }

            if (node is AstType && node.Parent is Constraint && IncludeKeywordsInCompletionList) {
                wrapper.AddCustom ("new()");
            }

            if (AutomaticallyAddImports) {
                state = GetState();
                foreach (var type in Compilation.GetAllTypeDefinitions ()) {
                    if (!lookup.IsAccessible (type, false))
                        continue;
                    var resolveResult = state.LookupSimpleNameOrTypeName(type.Name, type.TypeArguments, NameLookupMode.Expression);
                    if (resolveResult.Type.GetDefinition () == type)
                        continue;

                    if (onlyAddConstructors) {
                        if (!type.GetConstructors().Any(c => lookup.IsAccessible(c, true)))
                            continue;
                    }

                    wrapper.AddTypeImport(type, !resolveResult.IsError, onlyAddConstructors);
                }
            }
        }