public override void AddAnalysis(FileItem file_item)
        {
            var file = file_item.GetFile();

            if (file == null)
            {
                return;
            }

            var root = file.GetRoot() as ALittleScriptRootElement;

            if (root == null)
            {
                return;
            }

            ALittleScriptIndex.inst.AddRoot(root);
        }