question: return the expression string converted to tokens . concode_field_sep int lastGoodPosition concode_elem_sep String expression concode_elem_sep List<Token> tokenStream concode_elem_sep int position concode_field_sep Token next concode_elem_sep void checkpoint concode_elem_sep boolean hasNext concode_elem_sep List<Token> getTokenStream concode_elem_sep int decrementPosition concode_elem_sep Token peek concode_elem_sep Token peek concode_elem_sep boolean peek concode_elem_sep boolean peek concode_elem_sep boolean peek concode_elem_sep boolean lookAhead concode_elem_sep Token eat concode_elem_sep boolean maybeEat concode_elem_sep String toString concode_elem_sep int position concode_elem_sep void raiseException concode_elem_sep boolean isNextAdjacent
target: String function ( ) { return expression ; }