public PreSequence(Object[] o, String tag) { this(o, tag, false); }
public PreSequence(Object[] o, String tag, boolean keeper) { this.o = o; this.tag = tag; this.keeper = keeper; }
boolean[] drops = null;
- public Element[] expand(Union u, HashSet<Sequence> set) {
- if (o==null) return new Element[0];
- Element[] o2 = new Element[o.length];
- drops = new boolean[o.length];
- int j = 0;
- for(int i=0; i<o.length; i++) {
- Object oi = o[i];
- if (oi instanceof MyDrop) { oi = ((MyDrop)oi).o; drops[j] = true; }
- if (oi==SELF) o2[j] = u.new Subset("(("+u+"))", set);
- else if (oi instanceof MyLift) { o2[j] = CharToken.string(tag = ((MyLift)oi).s); drops[j] = true; }
- else o2[j] = (Element)oi;
-
- if (dropAll.contains(o2[j])) drops[j] = true;
-
- o2[j] = o2[j];
- j++;
- }
- return o2;
- }
public Union buildUnion() {
Union u = new Union("???");
u.add(buildSequence(u));
for(Sequence s : and) u.add(s);
for(Sequence s : not) u.add(s);
HashSet<Sequence> set = new HashSet<Sequence>();
- Element[] expansion = expand(u, set);
+ Element[] o2 = o==null ? new Element[0] : new Element[o.length];
+ if (o != null) {
+ drops = new boolean[o.length];
+ int j = 0;
+ for(int i=0; i<o.length; i++) {
+ Object oi = o[i];
+ if (oi instanceof MyDrop) { oi = ((MyDrop)oi).o; drops[j] = true; }
+ if (oi==SELF) o2[j] = u.new Subset("(("+u+"))", set);
+ else if (oi instanceof MyLift) { o2[j] = CharToken.string(tag = ((MyLift)oi).s); drops[j] = true; }
+ else o2[j] = (Element)oi;
+ if (MetaGrammar.dropAll.contains(o2[j])) drops[j] = true;
+ o2[j] = o2[j];
+ j++;
+ }
+ }
+ Element[] expansion = o2;
boolean keeper = this.keeper;
Sequence ret = dropAll || lame || keeper ? Sequence.drop(expansion, and, not, lame) : null;
if (ret==null && tag!=null) {