X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=src%2Fedu%2Fberkeley%2Fsbp%2FForest.java;h=e74d81eda484d97caaec05bacf7c52f5b94dad39;hb=743754674298bb8a3303bdffd3b5c5cc0de1b158;hp=4f4baacb62315f466039ca27283f7366d5c1f631;hpb=4eeae516c2ef96ca11d24f23fd5e80d12e7734a6;p=sbp.git

diff --git a/src/edu/berkeley/sbp/Forest.java b/src/edu/berkeley/sbp/Forest.java
index 4f4baac..e74d81e 100644
--- a/src/edu/berkeley/sbp/Forest.java
+++ b/src/edu/berkeley/sbp/Forest.java
@@ -1,6 +1,6 @@
 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.*;
@@ -11,35 +11,53 @@ public abstract class Forest<T> /*extends PrintableTree<Forest.MyBody<T>>*/ impl
 
     /** 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 HashSet<Tree<T>> expand(boolean toss) {
-        TreeMaker<T> ret = new TreeMaker<T>();
-        invoke(ret, new Boolean(toss), null);
-        if (toss && ret.size() > 1) throw new Ambiguous(this);
+        //if (toss) scan();
+        final HashSetTreeConsumer<T> ret = new HashSetTreeConsumer<T>();
+        visit(new TreeMaker2<T>(toss, ret), null, null);
+        if (toss && ret.size() > 1) throw new InnerAmbiguous(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 MyBody<T>(loc, tag, tokens, unwrap, singleton);
+    private static class InnerAmbiguous extends RuntimeException {
+        public final Forest<?> f;
+        public InnerAmbiguous(Forest<?> f) { this.f = f; }
+    }
+
+    public static interface TreeConsumer<T> {
+        public void addTree(Tree<T> t);
+    }
+    public 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[] { }, 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); }
+    static        <T> Forest<T> leaf(Input.Location loc, T tag, Position p) { return create(loc, tag, null, false, false, p); }
+
+    public static <T> Forest<T> create(Input.Location loc, T tag, Forest<T>[] tokens, boolean unwrap, boolean singleton, Position p) {
+        return new MyBody<T>(loc, tag, tokens, unwrap, singleton, p);
     }
 
     // Body //////////////////////////////////////////////////////////////////////////////
 
     protected static interface Body<T> {
-        TreeMaker<T> expand(boolean toss, int i, TreeMaker<T> h);
+        void expand(int i, TreeMaker<T> h);
     }
 
     protected static class MyBody<T> extends Forest<T> implements Body<T> /* extends PrintableTree<Forest<T>> implements */ {
 
-        public <B,C> void invoke(Invokable<Forest.Body<T>,B,C> ivbc, B b, C c) {
+        public <B,C> void visit(Invokable<Forest.Body<T>,B,C> ivbc, B b, C c) {
             ivbc.invoke(this, b, c);
         }
 
@@ -48,8 +66,9 @@ public abstract class Forest<T> /*extends PrintableTree<Forest.MyBody<T>>*/ impl
         private final Forest<T>[]       tokens;
         private final boolean           unwrap;
         private final boolean           singleton;
+        private final Sequence.Position reduction;
 
-        private MyBody(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, Position reduction) {
             this.location = loc;
             this.tag = tag;
             this.tokens = tokens==null ? emptyForestArray : new Forest[tokens.length];
@@ -57,31 +76,35 @@ public abstract class Forest<T> /*extends PrintableTree<Forest.MyBody<T>>*/ impl
             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;
         }
 
-        public TreeMaker<T> expand(boolean toss, int i, TreeMaker<T> h) {
+        public void expand(final int i, final TreeMaker<T> h) {
             if (singleton) {
-                tokens[0].invoke(h, toss, i);
+                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, h.toks.toArray(tree_hint)));
+            if (i==tokens.length) {
+                h.finish(tag, location);
 
             } else if (unwrap && i==tokens.length-1) {
                 if (tokens[i] != null)
-                    tokens[i].invoke(h, toss, 0);
+                    tokens[i].visit(h, null, 0);
 
             } else {
-                boolean hit = false;
-                for(Tree<T> r : tokens[i].expand(toss)) {
-                    hit = true;
-                    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();
+                tokens[i].visit(new TreeMaker<T>(h.toss) {
+                    public void start(T head, Input.Location loc) { }
+                    public void addTree(Tree<T> t) { toks.add(t); }
+                    public void finish(T head, Input.Location loc) {
+                        int old = h.toks.size();
+                        h.addTree(new Tree<T>(loc, head, toks.toArray(tree_hint)));
+                        expand(i+1, h);
+                        while(h.toks.size() > old) h.toks.remove(h.toks.size()-1);
+                    }
+                }, null, null);
             }
-            return h;
         }
 
         protected String  headToString()         { return null; }
@@ -103,24 +126,38 @@ public abstract class Forest<T> /*extends PrintableTree<Forest.MyBody<T>>*/ impl
         private FastSet<Forest<T>> hp = new FastSet<Forest<T>>();
         public Ref() { }
         public void merge(Forest p) { if (p!=this) hp.add(p, true); }
-        public <B,C> void invoke(Invokable<Forest.Body<T>,B,C> ivbc, B b, C c) {
+        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.invoke(ivbc, b, c);
+            for(Forest<T> f : hp)
+                f.visit(ivbc, b, c);
         }
         public Forest resolve() { return this; }
     }
 
-    public abstract <B,C> void invoke(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 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)));; }
+        public void start(T head, Input.Location loc) { }
+        public void addTree(Tree<T> t) { toks.add(t); }
+    }
+    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 void invoke(Forest.Body<T> bod, Boolean toss, Integer i) {
+        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);
+        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>>();
-                bod.expand(toss, 0, this);
+                bod.expand(0, this);
                 this.toks = toks;
             } else {
-                bod.expand(toss, i, this);
+                bod.expand(i, this);
             }
         }
     }