* @throws InvalidStartRule
*/
private DefaultTranslationMapper createMapper() throws StateConflict, InvalidStartRule, StrandedSymbol {
DefaultTranslationMapper mapper = new DefaultTranslationMapper() ;
mapper.addTranslation(new Rule("E'","E"),new TopTrans()) ;
mapper.addTranslation(new Rule("E","E","+","F"),new PlusTrans()) ;
mapper.addTranslation(new Rule("E","F"),new FacTrans()) ;
mapper.addTranslation(new Rule("F","F","*","T"),new TimesTrans()) ;
mapper.addTranslation(new Rule("F","T"),new TermTrans()) ;
mapper.addTranslation(new Rule("T","id"),new IdTrans()) ;
mapper.addTranslation(new Rule("T","(","E",")"),new ParenTrans()) ;