- public Forest reduce(GSS.Phase.Node parent) {
- if (numPop==0) return finish(parent, zero(), parent.phase());
- return reduce(parent, numPop-1, null, parent.phase());
- }
-
- public Forest reduce(GSS.Phase.Node parent, GSS.Phase.Node onlychild) {
- if (numPop<=0) throw new Error("called wrong form of reduce()");
- int pos = numPop-1;
- holder[pos] = parent.pending();
- if (pos==0) {
- System.arraycopy(holder, 0, position.holder, 0, holder.length);
- return finish(onlychild, position.rewrite(parent.phase().getLocation()), parent.phase());
- }
- return reduce(onlychild, pos-1, null, parent.phase());
- }
-
- // 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 target) {
- if (pos<0) return finish(parent, rex, target);
- holder[pos] = parent.pending();
- if (pos==0 && rex==null) {
- System.arraycopy(holder, 0, position.holder, 0, holder.length);
- rex = position.rewrite(target.getLocation());
- }
- for(GSS.Phase.Node child : parent.parents())
- if (pos==0) finish(child, rex, target);
- else reduce(child, pos-1, 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;
- }