- public Forest reduce(GSS.Phase.Node parent, GSS.Phase.Node onlychild) {
- int pos = numPop-1;
- if (pos>=0) holder[pos] = parent.pending();
- Forest rex = null;
- if (pos==0) {
- if (rex==null) {
- System.arraycopy(holder, 0, position.holder, 0, holder.length);
- rex = position.rewrite(parent.phase().getLocation());
- }
- }
- return reduce(onlychild, pos-1, rex, null, parent.phase());
- }
-
- private Forest zero = null;
- public Forest zero() {
- if (zero != null) return zero;
- if (numPop > 0) throw new Error();
- return zero = position.rewrite(null);
- }
-
- // FIXME: this could be more elegant and/or cleaner and/or somewhere else
- private Forest reduce(GSS.Phase.Node parent, int pos, Forest rex, GSS.Phase.Node onlychild, GSS.Phase target) {
- if (pos>=0) holder[pos] = parent.pending();
- if (pos==0) {
- if (rex==null) {
- System.arraycopy(holder, 0, position.holder, 0, holder.length);
- rex = position.rewrite(target.getLocation());
- }
- if (onlychild != null)
- reduce(onlychild, pos-1, rex, null, target);
- else
- for(GSS.Phase.Node child : parent.parents())
- reduce(child, pos-1, rex, null, target);
- } else if (pos>0) {
- if (onlychild != null)
- reduce(onlychild, pos-1, rex, null, target);
- else
- for(GSS.Phase.Node child : parent.parents())
- reduce(child, pos-1, rex, null, target);
- } else {
- return finish(parent, rex, target);
- }
- return rex;
- }
- private Forest finish(GSS.Phase.Node parent, Forest result, GSS.Phase target) {
- State state = parent.state.gotoSetNonTerminals.get(position.owner());
- if (state!=null)
- target.newNode(parent, result, state, numPop<=0, parent.phase());
- return result;
- }