- public abstract Sequence and(Sequence s);
- public abstract Sequence not(Sequence s);
-
- private void needs(Sequence s) { s.needed.add(this); needs.add(s); }
- private void hates(Sequence s) { s.hated.add(this); hates.add(s); }
-
- void clone(Sequence seq) {
- for(Sequence s : seq.hates) hates(s);
- for(Sequence s : seq.needs) needs(s);
- noFollow = seq.noFollow;
+ public Sequence and(Sequence s) { Sequence ret = dup(); ret.needs.add(s); s.needed.add(ret); return ret; }
+ public Sequence not(Sequence s) { Sequence ret = dup(); ret.hates.add(s); s.hated.add(ret); return ret; }
+ abstract Sequence _clone();
+ Sequence dup() {
+ Sequence ret = _clone();
+ for(Sequence s : needs) { ret.needs.add(s); s.needed.add(ret); }
+ for(Sequence s : hates) { ret.hates.add(s); s.hated.add(ret); }
+ ret.noFollow = noFollow;
+ return ret;