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 Iterable<Reduction> getEofReductions() { return eofReductions; }
public Iterator<Position> iterator() { return hs.iterator(); }
this.holder = new Forest[numPop];
}
public String toString() { return "[reduce " + position + "]"; }
- public Forest reduce(Forest f, GSS.Phase.Node parent, GSS.Phase.Node onlychild, GSS.Phase target, Forest rex) {
- holder[numPop-1] = f;
- return reduce(parent, numPop-2, rex, onlychild, target);
- }
- public Forest reduce(GSS.Phase.Node parent, GSS.Phase.Node onlychild, GSS.Phase target, Forest rex) {
- return reduce(parent, numPop-1, rex, onlychild, target);
- }
private Forest zero = null;
public Forest zero() {
return zero = position.rewrite(null);
}
+ 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.Node onlychild, GSS.Phase target) {
- if (pos>=0) holder[pos] = parent.pending();
- if (pos<=0 && rex==null) {
+ 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());
}
- 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 {
- 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())
+ //if (pos==0) finish(parent, 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;
+ }
}
}