package edu.berkeley.sbp;
import edu.berkeley.sbp.*;
-import edu.berkeley.sbp.*;
+import edu.berkeley.sbp.Sequence.Position;
import edu.berkeley.sbp.util.*;
import java.io.*;
import java.util.*;
import java.lang.reflect.*;
/** an efficient representation of a collection of trees (Tomita's shared packed parse forest) */
-public abstract class Forest<T> {
+public abstract class Forest<T> /*extends PrintableTree<Forest.MyBody<T>>*/
+ implements Visitable<Forest.Body<T>>,
+ IntegerMappable,
+ GraphViz.ToGraphViz {
+
+ private static int master_idx = 0;
+ private final int idx = master_idx++;
+ public int toInt() { return idx; }
+
+ public abstract void expand(TaskList tl, HashSet<Tree<T>> ht);
+ public abstract void gather(TaskList tl, HashSet<Tree<T>>[] ht, HashSet<Tree<T>> target);
+
+ public static class TaskList extends ArrayList<TaskList.Task> {
+ public interface Task {
+ public void perform();
+ }
+ public class ExpandTask implements Task {
+ private Forest f;
+ private HashSet hs;
+ public ExpandTask(Forest f, HashSet hs) { this.f = f; this.hs = hs; }
+ public void perform() { f.expand(TaskList.this, hs); }
+ }
+ public class GatherTask implements Task {
+ private Forest f;
+ private HashSet[] ht;
+ private HashSet hs;
+ public GatherTask(Forest f, HashSet<Tree<?>>[] ht, HashSet<Tree<?>> hs) { this.f = f; this.hs = hs; this.ht = ht;}
+ public void perform() { f.gather(TaskList.this, ht, hs); }
+ }
+ public void expand(Forest f, HashSet hs) {
+ add(new ExpandTask(f, hs));
+ }
+ public void gather(Forest f, HashSet[] ht, HashSet hs) {
+ add(new GatherTask(f, ht, hs));
+ }
+ public void run() {
+ while(true) {
+ if (isEmpty()) return;
+ Task task = get(size()-1);
+ remove(size()-1);
+ task.perform();
+ }
+ }
+ }
/** assume that this forest contains exactly one tree and return it; otherwise throw an exception */
public final Tree<T> expand1() throws Ambiguous, ParseFailed {
- Iterator<Tree<T>> it = expand(true).iterator();
- if (!it.hasNext()) throw new ParseFailed();
- return it.next();
+ try {
+ Iterator<Tree<T>> it = expand(true).iterator();
+ if (!it.hasNext()) throw new ParseFailed();
+ return it.next();
+ } catch (InnerAmbiguous ia) { throw new Ambiguous(ia.f); }
}
/** expand this forest into a set of trees */
- public abstract HashSet<Tree<T>> expand(boolean toss);
+ public HashSet<Tree<T>> expand(boolean toss) {
+ /*
+ final HashSetTreeConsumer<T> ret = new HashSetTreeConsumer<T>();
+ visit(new TreeMaker2<T>(toss, ret), null, null);
+ */
+ TaskList tl = new TaskList();
+ HashSet<Tree<T>> ret = new HashSet<Tree<T>>();
+ tl.expand(this, ret);
+ tl.run();
- static <T> Forest<T> singleton(Token.Location loc) { return create(loc, null, new Forest[] { }, false, true); }
- static <T> Forest<T> singleton(Token.Location loc, Forest<T> body) { return create(loc, null, new Forest[] { body }, false, true); }
- static <T> Forest<T> leaf(Token.Location loc, T tag) { return create(loc, tag, null, false, false); }
- public static <T> Forest<T> create(Token.Location loc, T tag, Forest<T>[] tokens, boolean unwrap, boolean singleton) {
- return new MultiForest<T>(loc, tag, tokens, unwrap, singleton);
+ if (toss && ret.size() > 1) throw new InnerAmbiguous(this);
+ return ret;
}
+ private static class InnerAmbiguous extends RuntimeException {
+ public final Forest<?> f;
+ public InnerAmbiguous(Forest<?> f) { this.f = f; }
+ }
+
+ static interface TreeConsumer<T> {
+ public void addTree(Tree<T> t);
+ }
+ static class HashSetTreeConsumer<T> extends HashSet<Tree<T>> implements TreeConsumer<T> {
+ public void addTree(Tree<T> t) {
+ super.add(t);
+ }
+ }
+
+ static <T> Forest<T> singleton(Input.Location loc, Position p) {
+ return create(loc, null, new Forest[] { }, new Object[0], false, true, p); }
+ static <T> Forest<T> singleton(Input.Location loc, Forest<T> body, Position p) {
+ //return create(loc, null, new Forest[] { body }, false, true, p);
+ return body;
+ }
+ static <T> Forest<T> leaf(Input.Location loc, T tag, Position p) { return create(loc, tag, null, null, false, false, p); }
+ public static <T> Forest<T> create(Input.Location loc, T tag, Forest<T>[] tokens, Object[] labels, boolean unwrap, boolean singleton, Position p) {
+ return new MyBody<T>(loc, tag, tokens, labels, unwrap, singleton, p);
+ }
// Body //////////////////////////////////////////////////////////////////////////////
- protected static class Body<T> {
+ protected static interface Body<T> extends GraphViz.ToGraphViz {
+ void expand(int i, TreeMaker<T> h);
+ }
+ public abstract void edges(GraphViz.Node n);
+ public boolean ambiguous() { return false; }
+ protected static class MyBody<T> extends Forest<T> implements Body<T> /* extends PrintableTree<Forest<T>> implements */ {
- private final Token.Location location;
+ public boolean isTransparent() { return false; }
+ public boolean isHidden() { return false; }
+ public GraphViz.Node toGraphViz(GraphViz gv) {
+ if (gv.hasNode(this)) return gv.createNode(this);
+ GraphViz.Node n = gv.createNode(this);
+ n.label = headToString()==null?"":headToString();
+ n.directed = true;
+ n.comment = reduction==null?null:reduction+"";
+ edges(n);
+ return n;
+ }
+ boolean edges = false;
+ public void edges(GraphViz.Node n) {
+ if (edges) return;
+ edges = true;
+ for(int i=0; i<tokens.length; i++) {
+ if (i==tokens.length-1 && unwrap && !tokens[i].ambiguous()) {
+ tokens[i].edges(n);
+ } else {
+ n.edge(tokens[i], labels==null?null:labels[i]);
+ }
+ }
+ }
+
+ public <B,C> void visit(Invokable<Forest.Body<T>,B,C> ivbc, B b, C c) {
+ ivbc.invoke(this, b, c);
+ }
+
+ private final Input.Location location;
private final T tag;
private final Forest<T>[] tokens;
+ private final Object[] labels;
private final boolean unwrap;
private final boolean singleton;
+ private final Sequence.Position reduction;
- private Body(Token.Location loc, T tag, Forest<T>[] tokens, boolean unwrap, boolean singleton) {
+ private MyBody(Input.Location loc, T tag, Forest<T>[] tokens, Object[] labels, boolean unwrap, boolean singleton, Position reduction) {
this.location = loc;
this.tag = tag;
this.tokens = tokens==null ? emptyForestArray : new Forest[tokens.length];
if (tokens != null) for(int i=0; i<tokens.length; i++) if (tokens[i]==null) throw new Error(i+"");
this.unwrap = unwrap;
this.singleton = singleton;
+ this.reduction = reduction;
+ this.labels = labels;
+ }
+ public void gather(TaskList tl, HashSet<Tree<T>>[] ht, HashSet<Tree<T>> target) {
+ gather(tl, ht, target, new Tree[ht.length], 0);
+ }
+ private void gather(TaskList tl, HashSet<Tree<T>>[] ht, HashSet<Tree<T>> target, Tree[] trees, int i) {
+ if (i==ht.length) {
+ target.add(new Tree<T>(null, tag, trees));
+ return;
+ }
+ for(Tree<T> tree : ht[i]) {
+ if (unwrap && i==trees.length-1) {
+ // I think this is wrong
+ Tree[] trees2 = new Tree[trees.length - 1 + tree.numChildren()];
+ System.arraycopy(trees, 0, trees2, 0, trees.length-1);
+ for(int j=0; j<tree.numChildren(); j++)
+ trees2[trees.length-1+j] = tree.child(j);
+ target.add(new Tree<T>(null, tag, trees2));
+ } else {
+ trees[i] = tree;
+ gather(tl, ht, target, trees, i+1);
+ trees[i] = null;
+ }
+ }
+ }
+ public void expand(TaskList tl, HashSet<Tree<T>> ht) {
+ if (singleton) {
+ tokens[0].expand(tl, ht);
+ return;
+ }
+ HashSet<Tree<T>>[] children = new HashSet[tokens.length];
+ tl.gather(this, children, ht);
+ for(int i=0; i<children.length; i++) {
+ children[i] = new HashSet<Tree<T>>();
+ tl.expand(tokens[i], children[i]);
+ }
}
- private HashSet<Tree<T>> expand(boolean toss, ArrayList<Tree<T>> toks, int i, HashSet<Tree<T>> h) {
+ public void expand(final int i, final TreeMaker<T> h) {
if (singleton) {
- for(Body<T> b : (IterableForest<T>)tokens[0]) b.expand(toss, toks, i, h);
+ tokens[0].visit(h, null, i);
+ return;
+ }
+ if (i==0) h.start(tag, location);
- } else if (i==tokens.length) {
- h.add(new Tree<T>(null, tag, toks.toArray(tree_hint)));
+ if (i==tokens.length) {
+ h.finish(tag, location);
} else if (unwrap && i==tokens.length-1) {
if (tokens[i] != null)
- for(Body b : (IterableForest<T>)tokens[i])
- b.expand(toss, toks, 0, h);
+ tokens[i].visit(h, null, 0);
} else {
- boolean hit = false;
- 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);
- }
- //if (!hit) throw new Error();
+ tokens[i].visit(new TreeMaker<T>(h.toss) {
+ public void start(T head, Input.Location loc) { }
+ public void addTree(Tree<T> t, Object label) { toks.add(t); labs.add(label); }
+ public void finish(T head, Input.Location loc) {
+ int old = h.toks.size();
+ h.addTree(new Tree<T>(loc, head, toks.toArray(tree_hint), labs.toArray(string_hint)), labels==null?null:labels[i]);
+ expand(i+1, h);
+ while(h.toks.size() > old) h.toks.remove(h.toks.size()-1);
+ while(h.labs.size() > old) h.labs.remove(h.labs.size()-1);
+ }
+ }, null, null);
}
- return h;
- }
-
- void addTo(FastSet<Body> h) {
- if (!singleton) h.add(this, true);
- else for(Body b : (IterableForest<T>)tokens[0]) b.addTo(h);
}
- public String toString() {
- StringBuffer ret = new StringBuffer();
- for(int i=0; i<tokens.length; i++) {
- String q = tokens[i]==null ? "null" : tokens[i].toString();
- if (q.length() > 0) {
- ret.append(q);
- ret.append(" ");
- }
- }
- String tail = ret.toString().trim();
- String head = (tag!=null && !tag.toString().equals("")) ? (tail.length() > 0 ? tag+":" : tag+"") : "";
- if (tail.length() > 0) tail = "{" + tail + "}";
- return head + tail;
- }
+ protected String headToString() { return tag==null?null:tag.toString(); }
+ protected String headToJava() { return null; }
+ protected String left() { return "{"; }
+ protected String right() { return "}"; }
+ protected boolean ignoreSingleton() { return false; }
}
// Ref //////////////////////////////////////////////////////////////////////////////
- private static abstract class IterableForest<T> extends Forest<T> implements Iterable<Forest.Body<T>> {
- public abstract Iterator<Forest.Body<T>> iterator();
- }
-
/**
* This class represents a partially complete collection of
* forests to be viewed as a forest at some later date; once
* viewed, it becomes immutable
*/
- static class Ref<T> extends IterableForest<T> {
- private FastSet<Forest> hp = new FastSet<Forest>();
- private Forest res = null;
+ static class Ref<T> extends Forest<T> {
+ public void expand(TaskList tl, HashSet<Tree<T>> ht) {
+ for (Forest<T> f : hp) f.expand(tl, ht);
+ }
+ public void gather(TaskList tl, HashSet<Tree<T>>[] ht, HashSet<Tree<T>> target) {
+ throw new Error();
+ }
+ public HashSet<GSS.Phase.Node> parents = new HashSet<GSS.Phase.Node>();
+ public boolean contains(Forest f) {
+ return hp.contains(f);
+ }
+ public boolean ambiguous() {
+ if (hp.size()==0) return false;
+ if (hp.size()==1) return hp.iterator().next().ambiguous();
+ return true;
+ }
+ private FastSet<Forest<T>> hp = new FastSet<Forest<T>>();
public Ref() { }
- public void merge(Forest p) {
- if (res != null) throw new Error("already resolved!");
- if (p==null) throw new Error();
- if (p!=this) hp.add(p, true);
- }
- public Iterator<Body<T>> iterator() { return ((IterableForest<T>)resolve()).iterator(); }
- public HashSet<Tree<T>> expand(boolean toss) { return resolve().expand(toss); }
- public String toString() { return resolve().toString(); }
- public Forest resolve() {
- if (hp==null) return res;
- FastSet<Body> nh = new FastSet<Body>();
- for(Forest<?> p : hp)
- for(Body<?> b : (IterableForest<?>)p)
- b.addTo(nh);
- res = new MultiForest(nh);
- hp = null;
- return res;
+ public int toInt() {
+ if (hp.size()==1) return hp.iterator().next().toInt();
+ return super.toInt();
+ }
+ public void merge(Forest p) { if (p!=this) hp.add(p, true); }
+
+ public boolean isTransparent() { return hp.size()==1; }
+ public boolean isHidden() { return hp.size()==0; }
+ public void edges(GraphViz.Node n) {
+ if (hp.size()==1) { hp.iterator().next().edges(n); return; }
+ for(Forest f : hp) f.edges(n);
}
+ public GraphViz.Node toGraphViz(GraphViz gv) {
+ //if (hp.size()==0) return null;
+ if (hp.size()==1) return hp.iterator().next().toGraphViz(gv);
+ if (gv.hasNode(this)) return gv.createNode(this);
+ GraphViz.Node n = gv.createNode(this);
+ n.label = "?";
+ n.color = "red";
+ for(Forest f : hp) n.edge(f, null);
+ return n;
+ }
+
+ 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; }
}
- // Implementations //////////////////////////////////////////////////////////////////////////////
-
- private static class MultiForest<T> extends IterableForest<T> {
- private final FastSet<Body<T>> results;
- private MultiForest(FastSet<Body<T>> results) { this.results = results; }
- public MultiForest(Token.Location loc, T tag, Forest<T>[] tokens, boolean unwrap, boolean singleton) {
- this.results = new FastSet<Body<T>>(new Body(loc, tag, tokens, unwrap, singleton));
- }
- public Iterator<Body<T>> iterator() { return results.iterator(); }
-
- public HashSet<Tree<T>> expand(boolean toss) {
- HashSet<Tree<T>> ret = new HashSet<Tree<T>>();
- for(Body<T> b : results)
- 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;
- }
-
- // Display //////////////////////////////////////////////////////////////////////////////
-
- private String toString = null;
- public String toString() {
- if (toString != null) return toString;
- StringBuffer ret = new StringBuffer();
- if (results.size()==1) {
- for(Forest.Body<T> r : results)
- ret.append(r);
- return toString = ret.toString();
- }
- ret.append("<?");
- boolean first = true;
- for(Forest.Body<T> r : results) {
- if (!first) ret.append(' ');
- first = false;
- ret.append(r);
+ public abstract <B,C> void visit(Invokable<Forest.Body<T>,B,C> ivbc, B b, C c);
+ private static class TreeMaker2<T> extends TreeMaker<T> {
+ private TreeConsumer<T> tc;
+ public TreeMaker2(boolean toss, TreeConsumer<T> tc) { super(toss); this.tc = tc; }
+ public void finish(T head, Input.Location loc) { tc.addTree(new Tree<T>(loc, head, toks.toArray(tree_hint), labs.toArray(string_hint)));; }
+ public void start(T head, Input.Location loc) { }
+ public void addTree(Tree<T> t, Object label) { toks.add(t); labs.add(label); }
+ }
+ private static abstract class TreeMaker<T> implements Invokable<Forest.Body<T>,Boolean,Integer>/*, TreeConsumer<T>*/ {
+ public ArrayList<Tree<T>> toks = new ArrayList<Tree<T>>();
+ public ArrayList<Object> labs = new ArrayList<Object>();
+ private boolean toss;
+ protected T head;
+ public TreeMaker(boolean toss) { this.toss = toss; }
+ public abstract void start(T head, Input.Location loc);
+ public abstract void finish(T head, Input.Location loc);
+ public abstract void addTree(Tree<T> t, Object label);
+ public void invoke(Forest.Body<T> bod, Boolean o, Integer i) {
+ if (i==null) {
+ ArrayList<Tree<T>> toks = this.toks;
+ this.toks = new ArrayList<Tree<T>>();
+ ArrayList<Object> labs = this.labs;
+ this.labs = new ArrayList<Object>();
+ bod.expand(0, this);
+ this.toks = toks;
+ this.labs = labs;
+ } else {
+ bod.expand(i, this);
}
- ret.append("?>");
- return toString = ret.toString();
}
}
// Statics //////////////////////////////////////////////////////////////////////////////
private static Tree[] tree_hint = new Tree[0];
+ private static String[] string_hint = new String[0];
private static final Forest[] emptyForestArray = new Forest[0];
+
+ protected String headToString() { return null; }
+ protected String headToJava() { return null; }
+ protected String left() { return "<?"; }
+ protected String right() { return "?>"; }
+ protected boolean ignoreSingleton() { return true; }
}
projects / sbp.git / blobdiff