public CodeStructureRootElement Build(IPsiSourceFile sourceFile, CodeStructureOptions options)
        {
            var t4File = sourceFile.GetTheOnlyPsiFile(T4Language.Instance) as IT4File;

            if (t4File == null)
            {
                return(null);
            }

            // TODO: handle VB
            var cSharpFile = sourceFile.GetTheOnlyPsiFile(CSharpLanguage.Instance) as ICSharpFile;

            if (cSharpFile == null)
            {
                return(null);
            }

            var cSharpFileImpl = cSharpFile as IFileImpl;

            if (cSharpFileImpl == null || cSharpFileImpl.SecondaryRangeTranslator == null)
            {
                return(null);
            }

            var state = new CSharpCodeStructureProcessingState(CodeStructureOptions.Default);

            var rootElement = new T4CodeStructureRootElement(t4File);

            foreach (ITreeNode treeNode in t4File.Children())
            {
                ProcessT4Node(treeNode, rootElement, cSharpFile, cSharpFileImpl.SecondaryRangeTranslator, state);
            }
            return(rootElement);
        }
		public CodeStructureRootElement Build(IPsiSourceFile sourceFile, CodeStructureOptions options) {
			var t4File = sourceFile.GetTheOnlyPsiFile(T4Language.Instance) as IT4File;
			if (t4File == null)
				return null;

			// TODO: handle VB
			var cSharpFile = sourceFile.GetTheOnlyPsiFile(CSharpLanguage.Instance) as ICSharpFile;
			var cSharpFileImpl = cSharpFile as IFileImpl;
			if (cSharpFileImpl == null || cSharpFileImpl.SecondaryRangeTranslator == null)
				return null;

			var state = new CSharpCodeStructureProcessingState(CodeStructureOptions.Default);

			var rootElement = new T4CodeStructureRootElement(t4File);
			foreach (ITreeNode treeNode in t4File.Children())
				ProcessT4Node(treeNode, rootElement, cSharpFile, cSharpFileImpl.SecondaryRangeTranslator, state);
			return rootElement;
		}