public IMethod ResolveConstructor(ITypeResolveContext context)
		{
			CSharpResolver r = new CSharpResolver(context);
			IType type = attributeType.Resolve(context);
			int totalArgumentCount = 0;
			if (positionalArguments != null)
				totalArgumentCount += positionalArguments.Count;
			if (namedCtorArguments != null)
				totalArgumentCount += namedCtorArguments.Count;
			ResolveResult[] arguments = new ResolveResult[totalArgumentCount];
			string[] argumentNames = new string[totalArgumentCount];
			int i = 0;
			if (positionalArguments != null) {
				while (i < positionalArguments.Count) {
					IConstantValue cv = positionalArguments[i];
					arguments[i] = cv.Resolve(context);
					i++;
				}
			}
			if (namedCtorArguments != null) {
				foreach (var pair in namedCtorArguments) {
					argumentNames[i] = pair.Key;
					arguments[i] = pair.Value.Resolve(context);
					i++;
				}
			}
			MemberResolveResult mrr = r.ResolveObjectCreation(type, arguments, argumentNames) as MemberResolveResult;
			return mrr != null ? mrr.Member as IMethod : null;
		}

 /// <summary>
 /// Creates a new TypeSystemAstBuilder.
 /// </summary>
 /// <param name="resolver">
 /// A resolver initialized for the position where the type will be inserted.
 /// </param>
 public TypeSystemAstBuilder(CSharpResolver resolver)
 {
     if (resolver == null)
         throw new ArgumentNullException("resolver");
     this.resolver = resolver;
     InitProperties();
 }

		protected string GetShortType (IType type)
		{
			if (builder == null) {
				var ctx = ext.CSharpUnresolvedFile.GetTypeResolveContext (ext.UnresolvedFileCompilation, ext.Document.Editor.Caret.Location) as CSharpTypeResolveContext;
				var state = new CSharpResolver (ctx);
				builder = new TypeSystemAstBuilder (state);
				var dt = state.CurrentTypeDefinition;
				var declaring = ctx.CurrentTypeDefinition != null ? ctx.CurrentTypeDefinition.DeclaringTypeDefinition : null;
				if (declaring != null) {
					while (dt != null) {
						if (dt.Equals (declaring)) {
							builder.AlwaysUseShortTypeNames = true;
							break;
						}
						dt = dt.DeclaringTypeDefinition;
					}
				}
			}
			try {
				return GLib.Markup.EscapeText (builder.ConvertType(type).ToString (ext.FormattingPolicy.CreateOptions ()));
			} catch (Exception e) {
				LoggingService.LogError ("Exception while getting short type.", e);
				return "";
			}
		}

		public override IEntity ResolveCref(string cref)
		{
			if (cref.Length > 2 && cref[1] == ':') {
				// resolve ID string
				return base.ResolveCref(cref);
			}
			var documentationReference = new CSharpParser().ParseDocumentationReference(cref);
			var csharpContext = context as CSharpTypeResolveContext;
			CSharpResolver resolver;
			if (csharpContext != null) {
				resolver = new CSharpResolver(csharpContext);
			} else {
				resolver = new CSharpResolver(context.Compilation);
			}
			var astResolver = new CSharpAstResolver(resolver, documentationReference);
			var rr = astResolver.Resolve(documentationReference);
			
			MemberResolveResult mrr = rr as MemberResolveResult;
			if (mrr != null)
				return mrr.Member;
			TypeResolveResult trr = rr as TypeResolveResult;
			if (trr != null)
				return trr.Type.GetDefinition();
			return null;
		}

		public CSharpCompletionDataFactory(CSharpCompletionContext completionContext, CSharpResolver contextAtCaret)
		{
			Debug.Assert(completionContext != null);
			Debug.Assert(contextAtCaret != null);
			this.completionContext = completionContext;
			this.contextAtCaret = contextAtCaret;
			this.builder = new TypeSystemAstBuilder(contextAtCaret);
		}

		public override ResolveResult Resolve(CSharpResolver resolver)
		{
			ResolveResult targetRR = target.Resolve(resolver);
			if (targetRR.IsError)
				return targetRR;
			IList<IType> typeArgs = typeArguments.Resolve(resolver.CurrentTypeResolveContext);
			return resolver.ResolveMemberAccess(targetRR, identifier, typeArgs, lookupMode);
		}

		public OverrideCompletionData(int declarationBegin, IMember m, CSharpResolver contextAtCaret)
			: base(m)
		{
			this.declarationBegin = declarationBegin;
			this.contextAtCaret = contextAtCaret;
			var ambience = new CSharpAmbience();
			ambience.ConversionFlags = ConversionFlags.ShowTypeParameterList | ConversionFlags.ShowParameterList | ConversionFlags.ShowParameterNames;
			this.CompletionText = ambience.ConvertSymbol(m);
		}

		public static ResolveResult Resolve(ICompilation compilation, CSharpParsedFile parsedFile, CompilationUnit cu, TextLocation location,
		                                    CancellationToken cancellationToken = default(CancellationToken))
		{
			AstNode node = cu.GetNodeAt(location);
			if (node == null)
				return null;
			AstNode resolvableNode;
			if (node is AstType) {
				resolvableNode = node;
				if (resolvableNode.Parent is ComposedType) {
					while (resolvableNode.Parent is ComposedType)
						resolvableNode = resolvableNode.Parent;
					//node is preffered over the resolvable node. Which shouldn't be done in the case of nullables, arrays etc.
					node = resolvableNode;
				}
			} else if (node is Identifier) {
				resolvableNode = node.Parent;
			} else if (node.NodeType == NodeType.Token) {
				if (node.Parent is ConstructorInitializer) {
					resolvableNode = node.Parent;
				} else {
					return null;
				}
			} else {
				// don't resolve arbitrary nodes - we don't want to show tooltips for everything
				return null;
			}
			
			if (resolvableNode != null && resolvableNode.Parent is ObjectCreateExpression) {
				resolvableNode = resolvableNode.Parent;
			}
			
			InvocationExpression parentInvocation = null;
			if ((resolvableNode is IdentifierExpression || resolvableNode is MemberReferenceExpression || resolvableNode is PointerReferenceExpression)) {
				// we also need to resolve the invocation
				parentInvocation = resolvableNode.Parent as InvocationExpression;
			}
			
			IResolveVisitorNavigator navigator;
			if (parentInvocation != null)
				navigator = new NodeListResolveVisitorNavigator(new[] { resolvableNode, parentInvocation });
			else
				navigator = new NodeListResolveVisitorNavigator(new[] { resolvableNode });
			
			CSharpResolver resolver = new CSharpResolver(compilation);
			ResolveVisitor v = new ResolveVisitor(resolver, parsedFile, navigator);
			v.Scan(cu);
			
			// Prefer the RR from the token itself, if it was assigned a ResolveResult
			// (this can happen with the identifiers in various nodes such as catch clauses or foreach statements)
			ResolveResult rr = v.GetResolveResult(node) ?? v.GetResolveResult(resolvableNode);
			if (rr is MethodGroupResolveResult && parentInvocation != null)
				return v.GetResolveResult(parentInvocation);
			else
				return rr;
		}

		public EventCreationCompletionData(string handlerName, IType delegateType, IEvent evt, string parameterList, IUnresolvedMember callingMember, IUnresolvedTypeDefinition declaringType, CSharpResolver contextAtCaret)
		{
			if (string.IsNullOrEmpty(handlerName)) {
				handlerName = (evt != null ? evt.Name : "Handle");
			}
			this.handlerName = handlerName;
			this.DisplayText = "<Create " + handlerName + ">";
			this.delegateTypeReference = delegateType.ToTypeReference();
			this.isStatic = callingMember != null && callingMember.IsStatic;
		}

		public EventCreationCompletionData(string handlerName, IType delegateType, IEvent evt, string parameterList, IUnresolvedMember callingMember, IUnresolvedTypeDefinition declaringType, CSharpResolver contextAtCaret)
		{
			if (string.IsNullOrEmpty(handlerName)) {
				handlerName = (evt != null ? evt.Name : "Handle");
			}
			this.handlerName = handlerName;
			this.DisplayText = StringParser.Parse("${res:CSharpBinding.Refactoring.EventCreation.EventHandlerText}", new[] { new StringTagPair("HandlerName", handlerName) });
			this.delegateTypeReference = delegateType.ToTypeReference();
			this.isStatic = callingMember != null && callingMember.IsStatic;
		}

		/// <summary>
		/// Creates a new C# AST resolver.
		/// </summary>
		/// <param name="resolver">The resolver state at the root node.</param>
		/// <param name="rootNode">The root node of the resolved tree.</param>
		/// <param name="parsedFile">The parsed file for the nodes being resolved. This parameter is used only
		/// when the root node is on the type level; it is not necessary when an expression is passed.
		/// This parameter may be null.</param>
		public CSharpAstResolver(CSharpResolver resolver, AstNode rootNode, CSharpParsedFile parsedFile = null)
		{
			if (resolver == null)
				throw new ArgumentNullException("resolver");
			if (rootNode == null)
				throw new ArgumentNullException("rootNode");
			this.initialResolverState = resolver;
			this.rootNode = rootNode;
			this.parsedFile = parsedFile;
		}

		public SignatureMarkupCreator (CSharpResolver resolver, CSharpFormattingOptions formattingOptions)
		{
			this.colorStyle = SyntaxModeService.GetColorStyle (MonoDevelop.Ide.IdeApp.Preferences.ColorScheme);

			this.resolver = resolver;
			this.astBuilder = new TypeSystemAstBuilder (resolver) {
				ConvertUnboundTypeArguments = true,
				UseAliases = false
			};
			this.formattingOptions = formattingOptions;
		}

		public ResolveResult DoResolve(ITypeResolveContext context)
		{
			CSharpResolver r = new CSharpResolver(context);
			r.CurrentTypeDefinition = parentTypeDefinition != null ? parentTypeDefinition.GetCompoundClass() : null;
			r.UsingScope = parentUsingScope;
			IType[] typeArgs = new IType[typeArguments.Count];
			for (int i = 0; i < typeArgs.Length; i++) {
				typeArgs[i] = typeArguments[i].Resolve(context);
			}
			return r.LookupSimpleNamespaceOrTypeName(identifier, typeArgs, isInUsingDeclaration);
		}

		/// <summary>
		/// Creates a new C# AST resolver.
		/// Use this overload if you are resolving within a complete C# file.
		/// </summary>
		/// <param name="compilation">The current compilation.</param>
		/// <param name="syntaxTree">The syntax tree to be resolved.</param>
		/// <param name="unresolvedFile">
		/// Optional: Result of <see cref="SyntaxTree.ToTypeSystem()"/> for the file being resolved.
		/// <para>
		/// This is used for setting up the context on the resolver. The unresolved file must be registered in the compilation.
		/// </para>
		/// <para>
		/// When a unresolvedFile is specified, the resolver will use the member's StartLocation/EndLocation to identify
		/// member declarations in the AST with members in the type system.
		/// When no unresolvedFile is specified (<c>null</c> value for this parameter), the resolver will instead compare the
		/// member's signature in the AST with the signature in the type system.
		/// </para>
		/// </param>
		public CSharpAstResolver(ICompilation compilation, SyntaxTree syntaxTree, CSharpUnresolvedFile unresolvedFile = null)
		{
			if (compilation == null)
				throw new ArgumentNullException("compilation");
			if (syntaxTree == null)
				throw new ArgumentNullException("syntaxTree");
			this.initialResolverState = new CSharpResolver(compilation);
			this.rootNode = syntaxTree;
			this.unresolvedFile = unresolvedFile;
			this.resolveVisitor = new ResolveVisitor(initialResolverState, unresolvedFile);
		}

		/// <summary>
		/// Creates a new C# AST resolver.
		/// Use this overload if you are resolving within a complete C# file.
		/// </summary>
		/// <param name="compilation">The current compilation.</param>
		/// <param name="compilationUnit">The compilation unit corresponding to the specified parsed file.</param>
		/// <param name="parsedFile">
		/// Optional: Result of the <see cref="TypeSystemConvertVisitor"/> for the file being resolved.
		/// <para>
		/// This is used for setting up the context on the resolver. The parsed file must be registered in the compilation.
		/// </para>
		/// <para>
		/// When a parsedFile is specified, the resolver will use the member's StartLocation/EndLocation to identify
		/// member declarations in the AST with members in the type system.
		/// When no parsedFile is specified (<c>null</c> value for this parameter), the resolver will instead compare the
		/// member's signature in the AST with the signature in the type system.
		/// </para>
		/// </param>
		public CSharpAstResolver(ICompilation compilation, CompilationUnit compilationUnit, CSharpParsedFile parsedFile = null)
		{
			if (compilation == null)
				throw new ArgumentNullException("compilation");
			if (compilationUnit == null)
				throw new ArgumentNullException("compilationUnit");
			this.initialResolverState = new CSharpResolver(compilation);
			this.rootNode = compilationUnit;
			this.parsedFile = parsedFile;
			this.resolveVisitor = new ResolveVisitor(initialResolverState, parsedFile);
		}

		public ResolveResult DoResolve(ITypeResolveContext context)
		{
			CSharpResolver r = new CSharpResolver(context);
			r.CurrentTypeDefinition = parentTypeDefinition;
			r.UsingScope = parentUsingScope;
			IType[] typeArgs = new IType[typeArguments.Count];
			for (int i = 0; i < typeArgs.Length; i++) {
				typeArgs[i] = typeArguments[i].Resolve(context);
			}
			return r.LookupSimpleNameOrTypeName(identifier, typeArgs, lookupMode);
		}

		string ConvertHelper(AstNode node, Action<CSharpCodeProvider, CodeObject, TextWriter, CodeGeneratorOptions> action)
		{
			CSharpResolver resolver = new CSharpResolver(compilation);
			resolver = resolver.WithCurrentUsingScope(unresolvedFile.RootUsingScope.Resolve(compilation));
			resolver = resolver.WithCurrentTypeDefinition(compilation.FindType(KnownTypeCode.Object).GetDefinition());
			var codeObj = convertVisitor.Convert(node, new CSharpAstResolver(resolver, node));
			
			StringWriter writer = new StringWriter();
			writer.NewLine = " ";
			action(new CSharpCodeProvider(), codeObj, writer, new CodeGeneratorOptions { IndentString = " " });
			return Regex.Replace(writer.ToString(), @"\s+", " ").Trim();
		}

		string Convert(Expression expr)
		{
			CSharpResolver resolver = new CSharpResolver(compilation);
			resolver = resolver.WithCurrentUsingScope(parsedFile.RootUsingScope.Resolve(compilation));
			resolver = resolver.WithCurrentTypeDefinition(compilation.FindType(KnownTypeCode.Object).GetDefinition());
			var codeExpr = (CodeExpression)convertVisitor.Convert(expr, new CSharpAstResolver(resolver, expr, parsedFile));
			
			StringWriter writer = new StringWriter();
			writer.NewLine = " ";
			new CSharpCodeProvider().GenerateCodeFromExpression(codeExpr, writer, new CodeGeneratorOptions { IndentString = " " });
			return Regex.Replace(writer.ToString(), @"\s+", " ");
		}

		public ImportCompletionData(ITypeDefinition typeDef, CSharpResolver contextAtCaret, bool useFullName)
			: base(typeDef)
		{
			this.Description = "using " + typeDef.Namespace + ";";
			if (useFullName) {
				var astBuilder = new TypeSystemAstBuilder(contextAtCaret);
				insertionText = astBuilder.ConvertType(typeDef).ToString();
			} else {
				insertionText = typeDef.Name;
				insertUsing = typeDef.Namespace;
			}
		}

 public override ResolveResult Resolve(CSharpResolver resolver)
 {
     ResolveResult[] elements = new ResolveResult[arrayElements.Count];
     for (int i = 0; i < elements.Length; i++) {
         elements[i] = arrayElements[i].Resolve(resolver);
     }
     if (elementType != null) {
         return resolver.ResolveArrayCreation(elementType.Resolve(resolver.CurrentTypeResolveContext), 1, null, elements);
     } else {
         return resolver.ResolveArrayCreation(null, 1, null, elements);
     }
 }