FastColoredTextBoxNS.SyntaxHighlighter.LuaAutoIndentNeeded C# (CSharp) Method

        private void LuaAutoIndentNeeded(object sender, AutoIndentEventArgs args)
        {
            //end of block
            if (Regex.IsMatch(args.LineText, @"^\s*(end|until)\b"))
            {
                args.Shift = -args.TabLength;
                args.ShiftNextLines = -args.TabLength;
                return;
            }
            // then ...
            if (Regex.IsMatch(args.LineText, @"\b(then)\s*\S+"))
                return;
            //start of operator block
            if (Regex.IsMatch(args.LineText, @"^\s*(function|do|for|while|repeat|if)\b"))
            {
                args.ShiftNextLines = args.TabLength;
                return;
            }

            //Statements else, elseif, case etc
            if (Regex.IsMatch(args.LineText, @"^\s*(else|elseif)\b", RegexOptions.IgnoreCase))
            {
                args.Shift = -args.TabLength;
            }
        }