import java.lang.reflect.*;
/** an efficient representation of a collection of trees (Tomita's shared packed parse forest) */
-public abstract class Forest<T> extends PrintableTree<Forest.Body<T>> implements Iterable<Forest.Body<T>> {
+public abstract class Forest<T> /*extends PrintableTree<Forest.MyBody<T>>*/ implements Visitable<Forest.Body<T>> {
/** assume that this forest contains exactly one tree and return it; otherwise throw an exception */
public final Tree<T> expand1() throws Ambiguous, ParseFailed {
}
/** expand this forest into a set of trees */
- //public abstract HashSet<Tree<T>> expand(boolean toss);
- public HashSet<Tree<T>> expand(boolean toss) {
- HashSet<Tree<T>> ret = new HashSet<Tree<T>>();
- for(Body<T> b : this)
- ret.addAll(b.expand(toss, new ArrayList<Tree<T>>(), 0, new HashSet<Tree<T>>()));
- if (toss && ret.size() > 1) throw new Ambiguous(this);
- return ret;
- }
+ public HashSet<Tree<T>> expand(boolean toss) {
+ TreeMaker<T> ret = new TreeMaker<T>();
+ visit(ret, new Boolean(toss), null);
+ if (toss && ret.size() > 1) throw new Ambiguous(this);
+ return ret;
+ }
static <T> Forest<T> singleton(Input.Location loc) { return create(loc, null, new Forest[] { }, false, true); }
static <T> Forest<T> singleton(Input.Location loc, Forest<T> body) { return create(loc, null, new Forest[] { body }, false, true); }
static <T> Forest<T> leaf(Input.Location loc, T tag) { return create(loc, tag, null, false, false); }
public static <T> Forest<T> create(Input.Location loc, T tag, Forest<T>[] tokens, boolean unwrap, boolean singleton) {
- return new MultiForest<T>(new Body<T>(loc, tag, tokens, unwrap, singleton));
+ return new MyBody<T>(loc, tag, tokens, unwrap, singleton);
}
// Body //////////////////////////////////////////////////////////////////////////////
- protected static class Body<T> extends PrintableTree<Forest<T>> implements Iterable<Forest<T>> {
+ protected static interface Body<T> {
+ TreeMaker<T> expand(boolean toss, int i, TreeMaker<T> h);
+ }
+
+ protected static class MyBody<T> extends Forest<T> implements Body<T> /* extends PrintableTree<Forest<T>> implements *//*, Invokable<Tree<T>>*/ {
+
+ public <B,C> void visit(Invokable<Forest.Body<T>,B,C> ivbc, B b, C c) {
+ ivbc.invoke(this, b, c);
+ }
+ public <B,C> void invoke(Tree<T> ivbc, B b, C c) {
+ //ivbc.invoke(this, b, c);
+ }
private final Input.Location location;
private final T tag;
private final boolean unwrap;
private final boolean singleton;
- private Body(Input.Location loc, T tag, Forest<T>[] tokens, boolean unwrap, boolean singleton) {
+ private MyBody(Input.Location loc, T tag, Forest<T>[] tokens, boolean unwrap, boolean singleton) {
this.location = loc;
this.tag = tag;
this.tokens = tokens==null ? emptyForestArray : new Forest[tokens.length];
this.singleton = singleton;
}
- private HashSet<Tree<T>> expand(boolean toss, ArrayList<Tree<T>> toks, int i, HashSet<Tree<T>> h) {
+ public TreeMaker<T> expand(boolean toss, int i, TreeMaker<T> h) {
if (singleton) {
- for(Body<T> b : tokens[0]) b.expand(toss, toks, i, h);
+ tokens[0].visit(h, toss, i);
} else if (i==tokens.length) {
- h.add(new Tree<T>(null, tag, toks.toArray(tree_hint)));
+ h.add(new Tree<T>(null, tag, h.toks.toArray(tree_hint)));
} else if (unwrap && i==tokens.length-1) {
if (tokens[i] != null)
- for(Body b : tokens[i])
- b.expand(toss, toks, 0, h);
+ tokens[i].visit(h, toss, 0);
} else {
boolean hit = false;
+ //tokens[i].visit(this,
for(Tree<T> r : tokens[i].expand(toss)) {
hit = true;
- int old = toks.size();
- toks.add(r);
- expand(toss, toks, i+1, h);
- while(toks.size() > old) toks.remove(toks.size()-1);
+ int old = h.toks.size();
+ h.toks.add(r);
+ expand(toss, i+1, h);
+ while(h.toks.size() > old) h.toks.remove(h.toks.size()-1);
}
//if (!hit) throw new Error();
}
return h;
}
- void addTo(FastSet<Body<T>> h) {
- /*if (!singleton)*/ h.add(this, true);
- //else for(Body b : tokens[0]) b.addTo(h);
- }
-
protected String headToString() { return null; }
protected String headToJava() { return null; }
protected String left() { return "{"; }
protected String right() { return "}"; }
protected boolean ignoreSingleton() { return false; }
- public Iterator<Forest<T>> iterator() { return new ArrayIterator<Forest<T>>(tokens); }
}
private FastSet<Forest<T>> hp = new FastSet<Forest<T>>();
public Ref() { }
public void merge(Forest p) { if (p!=this) hp.add(p, true); }
- public Iterator<Body<T>> iterator() {
- final Iterator<Forest<T>> ift = hp==null ? null : hp.iterator();
- return new Iterator<Body<T>>() {
- Iterator<Body<T>> ibt = ift==null ? null : ift.hasNext() ? ift.next().iterator() : null;
- public void remove() { throw new RuntimeException("not supported"); }
- public boolean hasNext() {
- if (ibt==null) return false;
- if (ibt.hasNext()) return true;
- ibt = ift.hasNext() ? ift.next().iterator() : null;
- return hasNext();
- }
- public Body<T> next() {
- return ibt.next();
- }
- };
-
+ public <B,C> void visit(Invokable<Forest.Body<T>,B,C> ivbc, B b, C c) {
+ if (hp==null) return;
+ for(Forest<T> f : hp) f.visit(ivbc, b, c);
}
public Forest resolve() { return this; }
}
- private static class MultiForest<T> extends Forest<T> {
- private final FastSet<Body<T>> results = new FastSet<Body<T>>();
- public MultiForest(Body<T> b) { results.add(b); }
- public Iterator<Body<T>> iterator() { return results.iterator(); }
+ public abstract <B,C> void visit(Invokable<Forest.Body<T>,B,C> ivbc, B b, C c);
+ private static class TreeMaker<T> extends HashSet<Tree<T>> implements Invokable<Forest.Body<T>,Boolean,Integer> {
+ public ArrayList<Tree<T>> toks = new ArrayList<Tree<T>>();
+ public void invoke(Forest.Body<T> bod, Boolean toss, Integer i) {
+ if (i==null) {
+ ArrayList<Tree<T>> toks = this.toks;
+ this.toks = new ArrayList<Tree<T>>();
+ bod.expand(toss, 0, this);
+ this.toks = toks;
+ } else {
+ bod.expand(toss, i, this);
+ }
+ }
}
// Statics //////////////////////////////////////////////////////////////////////////////
projects / sbp.git / blobdiff