Boo.Lang.Parser.BooLexer.mINTERPOLATED_EXPRESSION C# (CSharp) Method

        protected void mINTERPOLATED_EXPRESSION(bool _createToken)
        {
            int _ttype; IToken _token=null; int _begin=text.Length;
            _ttype = INTERPOLATED_EXPRESSION;

            if ((cached_LA1=='$') && (cached_LA2=='{'))
            {
            int _saveIndex = 0;
            _saveIndex = text.Length;
            match("${");
            text.Length = _saveIndex;
            if (0==inputState.guessing)
            {
                ParseInterpolatedExpression(RBRACE, LBRACE);
            }
            }
            else if ((cached_LA1=='$') && (cached_LA2=='(')) {
            int _saveIndex = 0;
            _saveIndex = text.Length;
            match("$(");
            text.Length = _saveIndex;
            if (0==inputState.guessing)
            {
                ParseInterpolatedExpression(RPAREN, LPAREN);
            }
            }
            else
            {
            throw new NoViableAltForCharException(cached_LA1, getFilename(), getLine(), getColumn());
            }

            if (_createToken && (null == _token) && (_ttype != Token.SKIP))
            {
            _token = makeToken(_ttype);
            _token.setText(text.ToString(_begin, text.Length-_begin));
            }
            returnToken_ = _token;
        }