public boolean canShift(Token t) { return shifts.contains(t); }
public Iterable<State> getShifts(Token t) { return shifts.get(t); }
public boolean isAccepting() { return accept; }
- public Iterable<Reduction> getReductions(Token t) { return reductions.get(t); }
+ public Iterable<Reduction> getReductions(Token t) { return t==null ? eofReductions : reductions.get(t); }
+ public boolean hasReductions(Token t) { return t==null ? eofReductions.size()>0 : reductions.has(t); }
public Iterable<Reduction> getEofReductions() { return eofReductions; }
public Iterator<Position> iterator() { return hs.iterator(); }
}
public String toString() { return "[reduce " + position + "]"; }
- public Forest reduce(GSS.Phase.Node parent, GSS.Phase.Node onlychild, Forest rex) {
- Forest ret = reduce(parent, numPop-1, rex, onlychild, parent.phase());
- return ret;
- }
-
private Forest zero = null;
public Forest zero() {
if (zero != null) return zero;
return zero = position.rewrite(null);
}
+ public void reduce(GSS.Phase.Node parent) {
+ if (numPop==0) finish(parent, zero(), parent.phase());
+ else reduce(parent, numPop-1, parent.phase());
+ }
+
+ public void 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);
+ finish(onlychild, position.rewrite(parent.phase().getLocation()), parent.phase());
+ } else {
+ reduce(onlychild, pos-1, 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.Node onlychild, GSS.Phase target) {
- if (pos>=0) holder[pos] = parent.pending();
+ private void reduce(GSS.Phase.Node parent, int pos, GSS.Phase target) {
+ 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);
+ System.arraycopy(holder, 0, position.holder, 0, holder.length);
+ Forest rex = position.rewrite(target.getLocation());
+ for(GSS.Phase.Node child : parent.parents()) finish(child, rex, target);
} else {
- State state = parent.state.gotoSetNonTerminals.get(position.owner());
- if (state!=null)
- target.newNode(parent, rex, state, numPop<=0, parent.phase());
+ for(GSS.Phase.Node child : parent.parents()) reduce(child, pos-1, target);
}
- return rex;
+ }
+ private void 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());
}
}
}