X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=src%2Fedu%2Fberkeley%2Fsbp%2Fmisc%2FDemo.java;h=fa6d733125025a6b81bb70caf0f2ac2fd1912335;hb=0bf2fced924400a496fb154be71188864296564c;hp=dbe62666eea7a2def2f2664eb76da1edcfc68bf1;hpb=80a840adb5df31ba5edd20ecac23086ad09a5ca1;p=sbp.git

diff --git a/src/edu/berkeley/sbp/misc/Demo.java b/src/edu/berkeley/sbp/misc/Demo.java
index dbe6266..fa6d733 100644
--- a/src/edu/berkeley/sbp/misc/Demo.java
+++ b/src/edu/berkeley/sbp/misc/Demo.java
@@ -2,6 +2,7 @@ package edu.berkeley.sbp.misc;
 import edu.berkeley.sbp.util.*;
 import edu.berkeley.sbp.*;
 import edu.berkeley.sbp.chr.*;
+import edu.berkeley.sbp.bind.*;
 import java.util.*;
 import java.lang.annotation.*;
 import java.lang.reflect.*;
@@ -46,46 +47,40 @@ public class Demo {
         private final Class _cl;
         private final Class[] _inner;
         public ReflectiveMeta() {
-            this(MG.class,
-                 new Class[] {
-                     MG.Grammar.class,
-                     MG.NonTerminal.class,
-                     MG.AnonUn.class,
-                     MG.Range.class,
-                     MG.El.class,
-                     MG.Seq.class,
-                     MG.NonTerminalReference.class,
-                     MG.StringLiteral.class,
-                     MG.XTree.class,
-                     MG.CharClass.class
-                 });
+            this(MG.class);
+        }
+        public ReflectiveMeta(Class c) {
+            this._cl = c;
+            this._inner = c.getDeclaredClasses();
         }
         public ReflectiveMeta(Class c, Class[] inner) {
             this._cl = c;
             this._inner = inner;
         }
-        private boolean match(Method m, String s) { return match(m.getAnnotation(tag.class), null, s); }
-        private boolean match(tag t, Class c, String s) {
+        private boolean match(Method m, String s) { return match(m.getAnnotation(bind.as.class), null, s); }
+        private boolean match(bind.as t, Class c, String s) {
             if (t==null) return false;
             if (t.value().equals(s)) return true;
             if (c != null && t.equals("") && c.getSimpleName().equals(s)) return true;
             return false;
         }
+        /*
         private boolean match(nonterminal t, Class c, String s) {
             if (t==null) return false;
             if (t.value().equals(s)) return true;
             if (c != null && t.equals("") && c.getSimpleName().equals(s)) return true;
             return false;
         }
+        */
         private boolean match(Class c, String s, String nonTerminalName) {
-            if (match((tag)c.getAnnotation(tag.class), c, s)) return true;
-            if (match((nonterminal)c.getAnnotation(nonterminal.class), c, nonTerminalName)) return true;
+            if (match((bind.as)c.getAnnotation(bind.as.class), c, s)) return true;
+            //if (match((nonterminal)c.getAnnotation(bind.as.class), c, nonTerminalName)) return true;
             return false;
         }
         public boolean match(Constructor con, String s, String nonTerminalName) {
             Class c = con.getDeclaringClass();
-            if (match((tag)con.getAnnotation(tag.class), null, s)) return true;
-            if (match((nonterminal)con.getAnnotation(nonterminal.class), c, s)) return true;
+            if (match((bind.as)con.getAnnotation(bind.as.class), null, s)) return true;
+            //if (match((nonterminal)con.getAnnotation(bind.as.class), c, s)) return true;
             return false;
         }
         public Object repeatTag() {
@@ -94,15 +89,15 @@ public class Demo {
         public Sequence tryResolveTag(String tag, String nonTerminalName, Element[] els, Object[] labels, boolean[] drops) {
             Production p = new Production(tag, nonTerminalName, els, labels, drops);
             for(Method m : _cl.getMethods())
-                if (new TargetMethod(m).isCompatible(p))
-                    return new TargetMethod(m).makeSequence(p);
+                if (new Target(m).isCompatible(p))
+                    return new Target(m).makeSequence(p);
             for(Class c : _inner)
                 for(Constructor con : c.getConstructors())
-                    if (new TargetConstructor(con).isCompatible(p))
-                        return new TargetConstructor(con).makeSequence(p);
+                    if (new Target(con).isCompatible(p))
+                        return new Target(con).makeSequence(p);
             for(Class c : _inner)
-                if (new TargetClass(c).isCompatible(p))
-                    return new TargetClass(c).makeSequence(p);
+                if (new Target(c).isCompatible(p))
+                    return new Target(c).makeSequence(p);
             return null;
         }
         public Sequence resolveTag(String tag, String nonTerminalName, Element[] els, Object[] labels, boolean[] drops) {
@@ -119,47 +114,7 @@ public class Demo {
         }
     }
 
-    
-    /**
-     *  Constructors, classes, and methods with this attribute will
-     *  match every production of the nonterminal called "value()"
-     *  that is arg-compatible.  If value() is undefined, then the
-     *  class/constructor/method name is used.
-     */ 
-    @Retention(RetentionPolicy.RUNTIME) public static @interface nonterminal { String value() default ""; }
-
-    @Retention(RetentionPolicy.RUNTIME) public static @interface raw { }
-
-    /**
-     *  Constructors, classes, and methods with this attribute will
-     *  match every tree tagged with "value()" that is arg-compatible.
-     *  If value() is undefined, then the class/constructor/method
-     *  name is used.
-     */ 
-    @Retention(RetentionPolicy.RUNTIME) public static @interface tag         { String value() default ""; }
-
-    /**
-     *  If any parameter to a method or field in a class has a named
-     *  arg-tag, that parameter/field matches the child of the tree
-     *  which either has that label or else is a reference to a
-     *  nonterminal with the corresponding name.
-     *  
-     *  The remaining non-named arg-tags match the remaining children
-     *  of the tree in sequential order.
-     *
-     *  If any arg-tagged parameters/fields remain, the match fails.
-     *  If there were no arg-tagged parameters-fields, it is as if all
-     *  of them were non-named and arg-tagged.
-     *
-     *  A method/constructor is arg-compatible if all of its arguments
-     *  are arg-compatible.
-     *
-     *  A class is arg-compatible if all of its fields are
-     *  arg-compatible, or if one of its constructors is arg-compatible.
-     *
-     */
-    @Retention(RetentionPolicy.RUNTIME) public static @interface arg         { String value() default ""; }
-
+   
     public static class Production {
         public String tag;
         public String nonTerminal;
@@ -179,19 +134,39 @@ public class Demo {
         }
     }
 
-    public static abstract class Target {
-        public abstract String getName();
-        public abstract tag getTag();
-        public abstract nonterminal getNonTerminal();
-        public abstract int[] buildSequence(Production p);
+    public static class Target {
+        public int[] buildSequence(Production p) {
+            Annotation[][] annotations = _bindable.getArgAnnotations();
+            String[]       names       = _bindable.getArgNames();
+            String name = _bindable.getSimpleName();
+            int len = annotations.length;
+            int ofs = 0;
+            bind.arg[] argtags  = new bind.arg[len];
+            for(int i=0; i<names.length; i++)
+                for(Annotation a : annotations[i+ofs])
+                    if (a instanceof bind.arg)
+                        argtags[i+ofs] = (bind.arg)a;
+            return Target.this.buildSequence(p, names, argtags);
+        }
+        private Bindable _bindable;
+
+        public Target(Object o) { this(Bindable.create(o)); }
+        public Target(Bindable b) { this._bindable = b; }
+
+        public String getName() { return _bindable.getSimpleName(); }
+        public bind.as getBindAs() { return (bind.as)_bindable.getAnnotation(bind.as.class); }
+        //public nonterminal getNonTerminal() { return (nonterminal)_bindable.getAnnotation(bind.as.class); }
+        public String toString() { return _bindable.getSimpleName(); }
+        public boolean isRaw() { return _bindable.isAnnotationPresent(bind.raw.class); }
+
         public boolean isCompatible(Production p) {
-            tag t = getTag();
+            bind.as t = getBindAs();
             if (t != null &&
                 (t.value().equals(p.tag) ||
                  (t.value().equals("") && getName().equals(p.tag))))
                 return buildSequence(p)!=null;
 
-            nonterminal n = getNonTerminal();
+            bind.as n = getBindAs();
             if (n != null &&
                 (n.value().equals(p.nonTerminal) ||
                  (n.value().equals("") && getName().equals(p.nonTerminal))))
@@ -199,7 +174,8 @@ public class Demo {
 
             return false;
         }
-        public int[] buildSequence(Production p, String[] names, arg[] argtags) {
+
+        public int[] buildSequence(Production p, String[] names, bind.arg[] argtags) {
             int argTagged = 0;
             for(int i=0; i<argtags.length; i++)
                 if (argtags[i] != null)
@@ -221,233 +197,48 @@ public class Demo {
             }
         }
         public Sequence makeSequence(Production p) {
-            return Sequence.rewritingSequence(new TargetReducer(p, buildSequence(p), "reducer-"+this), p.elements, p.labels, p.drops);
-        }
-        public abstract Object plant(Object[] fields, int[] map);
-        public boolean isRaw() { return false; }
-        public Object invokeRaw(Iterable<Tree> t) { return null; }
-        public class TargetReducer implements Functor<Iterable<Tree>,Object> {
-            private Production p;
-            private int[] map;
-            private String name;
-            public TargetReducer(Production p, int[] map, String name) {
-                this.p = p;
-                this.map = map;
-                this.name = name;
-            }
-            public String toString() { return name; }
-            public Object invoke(Iterable<Tree> t) {
-                if (isRaw()) return invokeRaw(t);
-                ArrayList ret = new ArrayList();
-                for(Tree tc : t) {
-                    if (tc.head() != null && tc.head() instanceof Functor)
-                        ret.add(((Functor<Iterable<Tree>,Object>)tc.head()).invoke(tc.children()));
-                    else if (tc.numChildren() == 0)
-                        ret.add(tc.head());
-                    else {
-                        System.err.println("FIXME: don't know what to do about " + tc);
-                        ret.add(null);
-                    }
-                }
-                System.err.println("input tree: " + t);
-                return plant(ret.toArray(new Object[0]), map);
-            }
-        }
-    }
-
-    public static class TargetClass extends Target {
-        public final Class _class;
-        public TargetClass(Class _class) { this._class = _class; }
-        public String getName() { return _class.getSimpleName(); }
-        public tag getTag() { return (tag)_class.getAnnotation(tag.class); }
-        public nonterminal getNonTerminal() { return (nonterminal)_class.getAnnotation(nonterminal.class); }
-        public String toString() { return _class.getSimpleName(); }
-        public int[] buildSequence(Production p) {
-            Field[]  f       = _class.getDeclaredFields();
-            String[] names   = new String[f.length];
-            arg[]    argtags = new arg[f.length];
-            for(int i=0; i<f.length; i++) {
-                names[i]   = f[i].getName();
-                argtags[i] = f[i].getAnnotation(arg.class);
-            }
-            int[] ret = buildSequence(p, names, argtags);
-            if (ret!=null) return ret;
-            for(Constructor c : _class.getConstructors())
-                if (new TargetConstructor(c).buildSequence(p)!=null)
-                    return new TargetConstructor(c).buildSequence(p);
-            return null;
+            return Sequence.rewritingSequence(new TargetReducer(p, buildSequence(p), "reducer-"+this, _bindable, isRaw()),
+                                              p.elements, p.labels, p.drops);
         }
-        public Object plant(Object[] fields, int[] map) {
-            try {
-                Object ret = _class.newInstance();
-                Field[] f = _class.getFields();
-                int j = 0;
-                for(int i=0; i<f.length; i++)
-                    if (map[i] != -1) {
-                        Object tgt = Reflection.lub(fields[map[i]]);
-                        if (f[i].getType() == String.class) tgt = stringify(tgt);
-                        // FUGLY
-                        tgt = coerce(tgt, f[i].getType());
-                        System.err.println("setting a " + f[i].getType().getName() + " to " + Reflection.show(tgt));
-                        f[i].set(ret, tgt);
-                    }
-                return ret;
-            } catch (Exception e) {
-                e.printStackTrace();
-                throw new RuntimeException(e);
-            }
-        }
-    }
 
-    public static String stringify(Object o) {
-        if (o==null) return "";
-        if (!(o instanceof Object[])) return o.toString();
-        Object[] arr = (Object[])o;
-        StringBuffer ret = new StringBuffer();
-        for(int i=0; i<arr.length; i++)
-            ret.append(arr[i]);
-        return ret.toString();
     }
 
-    public static class TargetConstructor extends Target {
-        public final Constructor _ctor;
-        public TargetConstructor(Constructor _ctor) { this._ctor = _ctor; }
-        public String getName() { return _ctor.getName(); }
-        public tag getTag() { return (tag)_ctor.getAnnotation(tag.class); }
-        public nonterminal getNonTerminal() { return (nonterminal)_ctor.getAnnotation(nonterminal.class); }
-        public String toString() { return _ctor.getName(); }
-        public int[] buildSequence(Production p) {
-            Annotation[][] annotations = _ctor.getParameterAnnotations();
-            int len = annotations.length;
-            int ofs = 0;
-            String name = _ctor.getDeclaringClass().getName();
-            /*
-            if (name.indexOf('$') > name.lastIndexOf('.')) {
-                len--;
-                ofs++;
-            }
-            */
-            String[] names   = new String[len];
-            arg[]    argtags = new arg[len];
-            for(int i=0; i<names.length; i++)
-                for(Annotation a : annotations[i+ofs])
-                    if (a instanceof arg)
-                        argtags[i+ofs] = (arg)a;
-            return buildSequence(p, names, argtags);
-        }
-        public Object plant(Object[] fields, int[] map) {
-            try {
-                Class[] argTypes = _ctor.getParameterTypes();
-                Object[] args = new Object[argTypes.length];
-                int j = 0;
-                for(int i=0; i<args.length; i++)
-                    if (map[i] != -1) {
-                        Object tgt = Reflection.lub(fields[map[i]]);
-                        if (argTypes[i] == String.class) tgt = stringify(tgt);
-                        // FUGLY
-                        tgt = coerce(tgt, argTypes[i]);
-                        System.err.println("setting a " + argTypes[i].getName() + " to " + Reflection.show(tgt));
-                        args[i] = tgt;
-                    }
-                return _ctor.newInstance(args);
-            } catch (Exception e) {
-                throw new RuntimeException(e);
-            }
-        }
-    }
-    public static class TargetMethod extends Target {
-        public final Method _method;
-        public TargetMethod(Method _method) { this._method = _method; }
-        public String getName() { return _method.getName(); }
-        public String toString() { return _method.getName(); }
-        public tag getTag() { return (tag)_method.getAnnotation(tag.class); }
-        public nonterminal getNonTerminal() { return (nonterminal)_method.getAnnotation(nonterminal.class); }
-        public int[] buildSequence(Production p) {
-            Annotation[][] annotations = _method.getParameterAnnotations();
-            String[] names   = new String[annotations.length];
-            arg[]    argtags = new arg[annotations.length];
-            for(int i=0; i<names.length; i++)
-                for(Annotation a : annotations[i])
-                    if (a instanceof arg)
-                        argtags[i] = (arg)a;
-            int[] ret = buildSequence(p, names, argtags);
-            return ret;
-        }
-        public boolean isRaw() { return _method.isAnnotationPresent(raw.class); }
-        public Object invokeRaw(Iterable<Tree> t) {
-            try {
-                return _method.invoke(null, new Object[] { t });
-            } catch (Exception e) {
-                throw new RuntimeException(e);
-            }
-        }
-        public Object plant(Object[] fields, int[] map) {
-            try {
-                Class[] argTypes = _method.getParameterTypes();
-                Object[] args = new Object[argTypes.length];
-                int j = 0;
-                for(int i=0; i<args.length; i++)
-                    if (map[i] != -1) {
-                        Object tgt = Reflection.lub(fields[map[i]]);
-                        if (argTypes[i] == String.class) tgt = stringify(tgt);
-                        // FUGLY
-                        tgt = coerce(tgt, argTypes[i]);
-                        System.err.println("setting a " + argTypes[i].getName() + " to " + Reflection.show(tgt));
-                        args[i] = tgt;
-                    }
-                System.err.println("invoking " + _method + " with " + Reflection.show(args));
-                return _method.invoke(null, args);
-            } catch (Exception e) {
-                throw new RuntimeException(e);
-            }
-        }
-    }
-
-    public static Object coerce(Object o, Class c) {
-        if (o==null) return null;
-        if (c.isInstance(o)) return o;
-        if (c == char.class) {
-            return o.toString().charAt(0);
-        }
-
-        if (o.getClass().isArray() &&
-            o.getClass().getComponentType().isArray() &&
-            o.getClass().getComponentType().getComponentType() == String.class &&
-            c.isArray() &&
-            c.getComponentType() == String.class) {
-            String[] ret = new String[((Object[])o).length];
-            for(int i=0; i<ret.length; i++) {
-                StringBuffer sb = new StringBuffer();
-                for(Object ob : (Object[])(((Object[])o)[i]))
-                    sb.append(ob);
-                ret[i] = sb.toString();
-            }
-            return ret;
-        }
-
-        if (c.isArray() && (c.getComponentType().isInstance(o))) {
-            Object[] ret = (Object[])Array.newInstance(c.getComponentType(), 1);
-            ret[0] = o;
-            return ret;
-        }
-
-        if (o.getClass().isArray() && c.isArray()) {
-            boolean ok = true;
-            for(int i=0; i<((Object[])o).length; i++) {
-                Object ob = (((Object[])o)[i]);
-                if (ob != null) {
-                    System.err.println("no hit with " + c.getComponentType().getName() + " on " + Reflection.show(((Object[])o)[i]));
-                    ok = false;
+    public static class TargetReducer implements Tree.TreeFunctor<Object,Object> {
+        private int[] map;
+        private String name;
+        private Bindable _bindable;
+        private boolean _israw;
+        public TargetReducer(Production p, int[] map, String name, Bindable b, boolean raw) {
+            this.map = map;
+            this.name = name;
+            this._bindable = b;
+            this._israw = raw;
+        }
+        public String toString() { return name; }
+        public Object invoke(Iterable<Tree<Object>> t) {
+            if (_israw) return _bindable.impose(new Object[] { t });
+            ArrayList ret = new ArrayList();
+            for(Tree tc : t) {
+                if (tc.head() != null && tc.head() instanceof Functor)
+                    ret.add(((Tree.TreeFunctor<Object,Object>)tc.head()).invoke(tc.children()));
+                else if (tc.numChildren() == 0)
+                    ret.add(tc.head());
+                else {
+                    System.err.println("FIXME: don't know what to do about " + tc);
+                    ret.add(null);
                 }
             }
-            if (ok) {
-                System.err.println("hit with " + c.getComponentType().getName());
-                return Array.newInstance(c.getComponentType(), ((Object[])o).length);
-            }
+            System.err.println("input tree: " + t);
+            Object[] o = (Object[])ret.toArray(new Object[0]);
+            int max = 0;
+            for(int i=0; i<map.length; i++) max = Math.max(map[i], max);
+            Object[] o2 = new Object[max+1];
+            for(int i=0; i<o.length; i++) o2[map[i]] = o[i];
+            return _bindable.impose(o2);
         }
-        return o;
     }
 
+
     public static Union cached = null;
     public static Union make() {
         if (cached != null) return cached;
@@ -465,7 +256,7 @@ public class Demo {
     }
     public static Union make(Tree t, String s) { return make(t, s, new ReflectiveMeta()); }
     public static Union make(Tree t, String s, ReflectiveMeta rm) {
-        Functor<Iterable<Tree>,Object> red = (Functor<Iterable<Tree>,Object>)t.head();
+        Tree.TreeFunctor<Object,Object> red = (Tree.TreeFunctor<Object,Object>)t.head();
         MG.Grammar g = (MG.Grammar)red.invoke(t.children());
         Context cx = new Context(g,rm);
         Union u = null;
@@ -480,15 +271,17 @@ public class Demo {
         return u;
     }
 
+
+
     public static class MG {
-        public static @tag("grammar") class Grammar {
+        public static @bind.as("grammar") class Grammar {
             public NonTerminal get(String s) {
                 for(NonTerminal nt : nonterminals)
                     if (nt.name.equals(s))
                         return nt;
                 return null;
             }
-            public @arg("NonTerminal") NonTerminal[] nonterminals;
+            public @bind.arg("NonTerminal") NonTerminal[] nonterminals;
             public String toString() {
                 String ret = "[ ";
                 for(NonTerminal nt : nonterminals) ret += nt + ", ";
@@ -519,8 +312,8 @@ public class Demo {
         }
         public static class NonTerminal extends Un {
             public String  name = null;
-            public @nonterminal("NonTerminal") NonTerminal(@arg("Word") String name,
-                                                           @arg("RHS") Seq[][] sequences) {
+            public @bind.as("=") NonTerminal(@bind.arg("Word") String name,
+                                         @bind.arg("RHS") Seq[][] sequences) {
                 this.name = name;
                 this.sequences = sequences;
             }
@@ -528,7 +321,7 @@ public class Demo {
         }
 
         public static class AnonUn extends Un {
-            public @tag("(") AnonUn(Seq[][] sequences) {
+            public @bind.as("(") AnonUn(Seq[][] sequences) {
                 this.sequences = sequences;
             }
             public Element build(Context cx) {
@@ -538,10 +331,10 @@ public class Demo {
             }
         }
 
-        //public static @tag void range(char c) { }
+        //public static @bind.as void range(char c) { }
         public static class Range {
-            public @tag("range") Range(char only) { first = only; last = only; }
-            public @tag("-")     Range(char first, char last) { this.first = first; this.last = last; }
+            public @bind.as("range") Range(char only) { first = only; last = only; }
+            public @bind.as("-")     Range(char first, char last) { this.first = first; this.last = last; }
             public char first;
             public char last;
         }
@@ -641,33 +434,33 @@ public class Demo {
                 return ret;
             }
         }
-        public static @tag("&")   Seq  and(Seq s,         El[] elements) { return s.and(seq(elements)); }
-        public static @tag("&~")  Seq  andnot(Seq s,      El[] elements) { return s.andnot(seq(elements)); }
-        public static @tag("->")  Seq  arrow(Seq s, El e)                { return s.follow(e); }
-        public static @tag("::")  Seq  tag(String tagname, Seq s)        { return s.tag(tagname); }
-        public static @tag("/")   Seq  slash(Seq s, El e)                { return s.separate(e); }
+        public static @bind.as("&")   Seq  and(Seq s,         El[] elements) { return s.and(seq(elements)); }
+        public static @bind.as("&~")  Seq  andnot(Seq s,      El[] elements) { return s.andnot(seq(elements)); }
+        public static @bind.as("->")  Seq  arrow(Seq s, El e)                { return s.follow(e); }
+        public static @bind.as("::")  Seq  tag(String tagname, Seq s)        { return s.tag(tagname); }
+        public static @bind.as("/")   Seq  slash(Seq s, El e)                { return s.separate(e); }
 
-        public static @tag("ps")  Seq  seq(El[] elements)                { return new Seq(elements); }
-        public static @tag        Seq  psx(Seq s)                        { return s; }
-        public static @tag(":")   El   colon(String s, El e)             { return new Label(s, e); }
-        public static @tag(")")   void close(String foo)                 { throw new Error("not supported"); }
-        public static @tag("()")  El   epsilon()                         { return new Constant(Union.epsilon); }
+        public static @bind.as("ps")  Seq  seq(El[] elements)                { return new Seq(elements); }
+        public static @bind.as        Seq  psx(Seq s)                        { return s; }
+        public static @bind.as(":")   El   colon(String s, El e)             { return new Label(s, e); }
+        public static @bind.as(")")   void close(String foo)                 { throw new Error("not supported"); }
+        public static @bind.as("()")  El   epsilon()                         { return new Constant(Union.epsilon); }
 
-        public static @tag("nonTerminal") class NonTerminalReference extends El {
-            public @arg String nonTerminal;
+        public static @bind.as("nonTerminal") class NonTerminalReference extends El {
+            public @bind.arg String nonTerminal;
             public Element build(Context cx) {
                 return cx.get(nonTerminal);
             }
         }
 
         public static class StringLiteral        extends Constant {
-            public @tag("literal") StringLiteral(String string) { super(CharRange.string(string)); }
+            public @bind.as("literal") StringLiteral(String string) { super(CharRange.string(string)); }
             public boolean drop() { return true; }
         }
 
         public static                     class CharClass            extends El {
             Range[] ranges;
-            public @tag("[") CharClass(Range[] ranges) { this.ranges = ranges; }
+            public @bind.as("[") CharClass(Range[] ranges) { this.ranges = ranges; }
             public Element build(Context cx) {
                 edu.berkeley.sbp.util.Range.Set set = new edu.berkeley.sbp.util.Range.Set();
                 for(Range r : ranges)
@@ -676,8 +469,8 @@ public class Demo {
             }
         }
 
-        public static @tag("{")           class XTree                 extends El {
-            public @arg Seq body;
+        public static @bind.as("{")           class XTree                 extends El {
+            public @bind.arg Seq body;
             public Element build(Context cx) {
                 throw new Error();
             }
@@ -709,40 +502,40 @@ public class Demo {
         }
 
         // FIXME: it would be nice if we could hoist this into "Rep"
-        public static @tag("++")  El plusmax(final El e)                     { return new Rep(e, null, false, true, true); }
-        public static @tag("+")   El plus(final El e)                        { return new Rep(e, null, false, true, false); }
-        public static @tag("++/") El plusmaxfollow(final El e, final El sep) { return new Rep(e, sep,  false, true, true); }
-        public static @tag("+/")  El plusfollow(final El e, final El sep)    { return new Rep(e, sep,  false, true, false); }
-        public static @tag("**")  El starmax(final El e)                     { return new Rep(e, null, true,  true, true); }
-        public static @tag("*")   El star(final El e)                        { return new Rep(e, null, true,  true, false); }
-        public static @tag("**/") El starmaxfollow(final El e, final El sep) { return new Rep(e, sep,  true,  true, true); }
-        public static @tag("*/")  El starfollow(final El e, final El sep)    { return new Rep(e, sep,  true,  true, false); }
-        public static @tag("?")   El question(final El e)                    { return new Rep(e, null, true,  true, false); }
-
-        public static @tag("!")   El bang(final El e)                        { return new Drop(e); }
-
-        public static @tag("^")   El caret(final String s) {
+        public static @bind.as("++")  El plusmax(final El e)                     { return new Rep(e, null, false, true, true); }
+        public static @bind.as("+")   El plus(final El e)                        { return new Rep(e, null, false, true, false); }
+        public static @bind.as("++/") El plusmaxfollow(final El e, final El sep) { return new Rep(e, sep,  false, true, true); }
+        public static @bind.as("+/")  El plusfollow(final El e, final El sep)    { return new Rep(e, sep,  false, true, false); }
+        public static @bind.as("**")  El starmax(final El e)                     { return new Rep(e, null, true,  true, true); }
+        public static @bind.as("*")   El star(final El e)                        { return new Rep(e, null, true,  true, false); }
+        public static @bind.as("**/") El starmaxfollow(final El e, final El sep) { return new Rep(e, sep,  true,  true, true); }
+        public static @bind.as("*/")  El starfollow(final El e, final El sep)    { return new Rep(e, sep,  true,  true, false); }
+        public static @bind.as("?")   El question(final El e)                    { return new Rep(e, null, true,  true, false); }
+
+        public static @bind.as("!")   El bang(final El e)                        { return new Drop(e); }
+
+        public static @bind.as("^")   El caret(final String s) {
             return new Drop(new Constant(CharRange.string(s)) {
                     public String getOwnerTag() { return s; }
                 });
         }
 
-        public static @tag("~")   El tilde(final El e) {
+        public static @bind.as("~")   El tilde(final El e) {
             return new PostProcess(e) {
                     public Element postProcess(Element e) {
                         return MetaGrammar.infer((Topology<Character>)Atom.toAtom(e).complement()); 
                     } }; }
 
-        public static @tag("^^")  void doublecaret(final El e)                 { throw new Error("not implemented"); }
+        public static @bind.as("^^")  void doublecaret(final El e)                 { throw new Error("not implemented"); }
 
-        //public static @tag("(")   El subexpression(Seq[][] rhs)                { return new NonTerminal(rhs); }
+        //public static @bind.as("(")   El subexpression(Seq[][] rhs)                { return new NonTerminal(rhs); }
 
-        public static @nonterminal("Word")    String word(String s) { return s; }
-        public static @nonterminal("Quoted")  String quoted(String s) { return s; }
-        public static @nonterminal("escaped") String c(char c) { return c+""; }
-        public static @tag("\"\"")            String emptystring() { return ""; }
-        public static @tag("\n")              String retur() { return "\n"; }
-        public static @tag("\r")              String lf() { return "\r"; }
+        public static @bind.as("Word")    String word(String s) { return s; }
+        public static @bind.as("Quoted")  String quoted(String s) { return s; }
+        public static @bind.as("escaped") String c(char c) { return c+""; }
+        public static @bind.as("\"\"")    String emptystring() { return ""; }
+        public static @bind.as("\n")      String retur() { return "\n"; }
+        public static @bind.as("\r")      String lf() { return "\r"; }
 
     }
     public static class Context {
@@ -765,7 +558,7 @@ public class Demo {
         }
         public Context(Tree t, ReflectiveMeta rm) {
             this.rm = rm;
-            Functor<Iterable<Tree>,Object> red = (Functor<Iterable<Tree>,Object>)t.head();
+            Tree.TreeFunctor<Object,Object> red = (Tree.TreeFunctor<Object,Object>)t.head();
             this.grammar = (MG.Grammar)red.invoke(t.children());
         }
         public Union peek(String name) { return map.get(name); }