refactoring optimization for e*
refactoring optimization for e*

peg4d/peg4d-java,peg4d/peg4d-java,Kouhei-Moriya/peg4d-java,Kouhei-Moriya/peg4d-java,peg4d/peg4d-java,peg4d/peg4d-java,Kouhei-Moriya/peg4d-java,Kouhei-Moriya/peg4d-java