X-Git-Url: http://git.megacz.com/?p=sbp.git;a=blobdiff_plain;f=src%2Fedu%2Fberkeley%2Fsbp%2Fmisc%2FDemo.java;h=2846d7c841e17ae2fbc59817307c6874c665c66a;hp=638bf319f2e678592cb0a4e4c532767d73679f34;hb=16460a4ebf976fddbcb4dd79f1fa0b010d61602b;hpb=0c29e5bd879906ec108db3216c0f4979ed8315fb

diff --git a/src/edu/berkeley/sbp/misc/Demo.java b/src/edu/berkeley/sbp/misc/Demo.java
index 638bf31..2846d7c 100644
--- a/src/edu/berkeley/sbp/misc/Demo.java
+++ b/src/edu/berkeley/sbp/misc/Demo.java
@@ -1,486 +1,58 @@
+// Copyright 2006 all rights reserved; see LICENSE file for BSD-style license
+
 package edu.berkeley.sbp.misc;
-import edu.berkeley.sbp.util.*;
+
 import edu.berkeley.sbp.*;
 import edu.berkeley.sbp.chr.*;
+import edu.berkeley.sbp.misc.*;
+import edu.berkeley.sbp.meta.*;
+import edu.berkeley.sbp.util.*;
 import java.util.*;
-import java.lang.annotation.*;
-import java.lang.reflect.*;
 import java.io.*;
 
 public class Demo {
-    public static void main(String[] s) throws Exception {
-        Tree<String> res = new CharParser(MetaGrammar.make()).parse(new FileInputStream(s[0])).expand1();
-        
-        MetaGrammar.Meta m =
-            new ReflectiveMeta(MG.class,
-                               new Class[] {
-                                   MG.Grammar.class,
-                                   MG.NonTerminal.class,
-                                   MG.Range.class,
-                                   MG.El.class,
-                                   MG.Seq.class,
-                                   MG.NonTerminalReference.class,
-                                   MG.StringLiteral.class,
-                                   MG.Epsilon.class,
-                                   MG.Tree.class,
-                                   MG.CharClass.class
-                               });
-        MetaGrammar.Meta.MetaGrammarFile mgf = m.new MetaGrammarFile(res);
-        MetaGrammar.BuildContext bc = new MetaGrammar.BuildContext(mgf);
-        Union meta = mgf.get("s").build(bc);
-
-        System.err.println("parsing " + s[1]);
-        Tree t = new CharParser(meta).parse(new FileInputStream(s[1])).expand1();
-
-        System.out.println(t.toPrettyString());
-        Reducer red = (Reducer)t.head();
-        System.out.println(red.reduce(t));
-    }
-
-    public static class ReflectiveMeta extends MetaGrammar.Meta {
-        private final Class _cl;
-        private final Class[] _inner;
-        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) {
-            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;
-            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;
-            return false;
-        }
-        public Object repeatTag() {
-            return new Reducer() {
-                    public String toString() { return "[**]"; }
-                    public Object reduce(Tree t) {
-                        Object[] ret = new Object[t.numChildren()];
-                        for(int i=0; i<t.numChildren(); i++) {
-                            Tree tc = t.child(i);
-                            if (tc.head() != null && tc.head() instanceof Reducer)
-                                ret[i] = ((Reducer)tc.head()).reduce(tc);
-                            else if (tc.numChildren() == 0)
-                                ret[i] = tc.head();
-                            else {
-                                System.err.println("FIXME: don't know what to do about " + tc);
-                                ret[i] = null;
-                            }
-                        }
-                        return ret;
-                    }
-                };
-        }
-        public Sequence resolveTag(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);
-            for(Class c : _inner)
-                for(Constructor con : c.getConstructors())
-                    if (new TargetConstructor(con).isCompatible(p))
-                        return new TargetConstructor(con).makeSequence(p);
-            for(Class c : _inner)
-                if (new TargetClass(c).isCompatible(p))
-                    return new TargetClass(c).makeSequence(p);
-            throw new RuntimeException("could not find a Java method/class/ctor matching tag \""+tag+"\", nonterminal \""+nonTerminalName+"\"");
-        }
-    }
     /*
-    public static Object makeFlattener(final Method m, final Element[] els, final Object[] labels, final boolean[] drops) {
-        return new Reducer() {
-                public Object reduce(Tree t) {
-                    Object[] o = new Object[m.getParameterTypes()];
-                    int j = 0;
-                    for(int i=0; i<els.length; i++)
-                }
-            };
-    }
-    */
-
-    
-    /**
-     *  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 ""; }
-
-    /**
-     *  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;
-        public Object[] labels;
-        public boolean[] drops;
-        public Element[] elements;
-        public int count = 0;
-        public Production(String tag, String nonTerminal, Element[] elements, Object[] labels, boolean[] drops) {
-            this.tag = tag;
-            this.elements = elements; // FIXME: use this
-            this.nonTerminal = nonTerminal;
-            this.labels = labels;
-            this.drops = drops;
-            for(int i=0; i<drops.length; i++)
-                if (!drops[i])
-                    count++;
-        }
-    }
-
-    public static abstract class Target {
-        public abstract String getName();
-        public abstract tag getTag();
-        public abstract nonterminal getNonTerminal();
-        public abstract int[] buildSequence(Production p);
-        public boolean isCompatible(Production p) {
-            tag t = getTag();
-            if (t != null &&
-                (t.value().equals(p.tag) ||
-                 (t.value().equals("") && p.tag.equals(getName()))))
-                return buildSequence(p)!=null;
+    // our grammar class
+    public static class Math {
 
-            nonterminal n = getNonTerminal();
-            if (n != null &&
-                (n.value().equals(p.nonTerminal) ||
-                 (n.value().equals("") && p.nonTerminal.equals(getName()))))
-                return buildSequence(p)!=null;
+        public static @bind.as("(") Expr parenthesis(Expr e) { return e; }
+        public static class Expr implements Reflection.Show { }
 
-            return false;
+        public static @bind.as("Expr") class Numeric extends Expr {
+            public @bind.arg String numeric;
         }
-        public int[] buildSequence(Production p, String[] names, arg[] argtags) {
-            int argTagged = 0;
-            for(int i=0; i<argtags.length; i++)
-                if (argtags[i] != null)
-                    argTagged++;
 
-            // FIXME: can be smarter here
-            if (names.length==p.count) {
-                int[] ret = new int[p.count];
-                for(int i=0; i<p.count; i++) ret[i] = i;
-                return ret;
-            } else if (argTagged==p.count) {
-                int[] ret = new int[argtags.length];
-                int j = 0;
-                for(int i=0; i<argtags.length; i++)
-                    ret[i] = argtags[i]==null ? -1 : (j++);
-                return ret;
-            } else {
-                return null;
-            }
+        public static class BinOp extends Expr {
+            public @bind.arg Expr left;
+            public @bind.arg Expr right;
         }
-        public Sequence makeSequence(Production p) {
-            return Sequence.rewritingSequence(new TargetReducer(p), p.elements, p.labels, p.drops);
-        }
-        public abstract Object plant(Object[] fields, int[] map);
-        public class TargetReducer implements Reducer {
-            private Production p;
-            private int[] map;
-            public TargetReducer(Production p) {
-                this.p = p;
-                this.map = buildSequence(p);
-            }
-            public String toString() { return "reducer-"+Target.this; }
-            public Object reduce(Tree t) {
-                Object[] objects = new Object[t.numChildren()];
-                for(int i=0; i<t.numChildren(); i++) {
-                    Tree tc = t.child(i);
-                    if (tc.head() != null && tc.head() instanceof Reducer)
-                        objects[i] = ((Reducer)tc.head()).reduce(tc);
-                    else if (tc.numChildren() == 0)
-                        objects[i] = tc.head();
-                    else if (t.numChildren()==1) {
-                        //FIXME: EVIL!!
-                        objects[i] = reduce(t.child(0));
-                    } else {
-                        System.err.println("FIXME: don't know what to do about " + tc);
-                        objects[i] = null;
-                    }
-                }
-                System.err.println("input tree: " + t);
-                return plant(objects, map);
-            }
-        }
-    }
 
-    public static interface Reducer {
-        public Object reduce(Tree t);
-    }
-
-    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;
-        }
-        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 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 @bind.as("*") class Multiply extends BinOp { }
+        public static @bind.as("/") class Divide   extends BinOp { }
+        public static @bind.as("+") class Add      extends BinOp { }
+        public static @bind.as("-") class Subtract extends BinOp { }
     }
 
-    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 (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;
-                }
-            }
-            if (ok) {
-                System.err.println("hit with " + c.getComponentType().getName());
-                return Array.newInstance(c.getComponentType(), ((Object[])o).length);
-            }
-        }
-        return o;
-    }
 
-    public static class MG {
-        //public static @tag Grammar grammar(Grammar g) { return g; }
-        public static @tag("grammar") class Grammar {
-            public @arg("NonTerminal") NonTerminal[] nonterminals;
-            public String toString() {
-                String ret = "[ ";
-                for(NonTerminal nt : nonterminals) ret += nt + ", ";
-                return ret + " ]";
-            }
-        }
-        public static @nonterminal class NonTerminal extends El {
-            public @arg("Word") String  name;
-            public @arg("RHS")  Seq[][] sequences;
-        }
+    // invoke "java -jar edu.berkeley.sbp.jar edu.berkeley.sbp.misc.Demo tests/demo.g <expr>"
+    public static void main(String[] s) throws Exception {
 
-        public static @tag void range(char c) { }
-        public static class Range extends El {
-            public @tag("range") Range(char only) { first = only; last = only; }
-            public @tag("-")     Range(char first, char last) { this.first = first; this.last = last; }
-            public char first;
-            public char last;
-        }
-        public static class El { }
-        public static /*abstract*/ @nonterminal("Sequence") class Seq extends El { }
-        public static @tag("&")   Seq and(Sequence s,    El[] elements) { return new Seq(); }
-        public static @tag("&~")  Seq andnot(Sequence s, El[] elements) { return new Seq(); }
-        public static @tag        Seq ps(El[] elements) { return new Seq(); }
-        public static @tag        Seq psx(Seq s) { return s; }
-        public static @tag("::")  Seq tag(String tagname, Seq seq) { return new Seq(); }
-        public static @tag(":")   void colon(String s, El e) { }
-        public static @tag(")")   void close(String foo) { }
-        public static @tag("/")   Seq slash(Seq s, El e) { return new Seq(); }
-        public static @tag("->")  Seq arrow(Seq s, El e) { return new Seq(); }
+        Parser metaGrammarParser   = new CharParser(MetaGrammar.newInstance());
+        Tree<String> parsedGrammar = metaGrammarParser.parse(new CharInput(new FileInputStream(s[0]))).expand1();
+        Grammar.Bindings gbr       = new AnnotationGrammarBindings(Math.class);
+        Union   mathGrammar        = Grammar.create(parsedGrammar, "Expr", gbr);
+        Parser  mathParser         = new CharParser(mathGrammar);
 
-        public static @tag("nonTerminal") class NonTerminalReference extends El { public @arg String nonTerminal; }
-        public static @tag("literal")     class StringLiteral        extends El { public @arg String string; }
-        public static @tag("()")          class Epsilon              extends El { }
-        public static @tag("{")           class Tree                 extends El { public @arg Seq body; }
-        public static                     class CharClass            extends El { public @tag("[") CharClass(Range[] ranges) { } }
+        System.out.println("about to parse: \""+s[1]+"\"");
+        Tree tree = mathParser.parse(new CharInput(new StringReader(s[1]))).expand1();
 
-        public static @tag("++")  void plusmax(El e) { }
-        public static @tag("+")   void plus(El e) { }
-        public static @tag("++/") void plusmaxfollow(El e, El sep) { }
-        public static @tag("+/")  void plusfollow(El e, El sep) { }
-        public static @tag("**")  void starmax(El e) { }
-        public static @tag("*")   void star(El e) { }
-        public static @tag("**/") void starmaxfollow(El e, El sep) { }
-        public static @tag("*/")  void starfollow(El e, El sep) { }
-        public static @tag("!")   void bang(El e) { }
-        public static @tag("?")   void question(El e) { }
-        public static @tag("^")   void caret(String s) { }
-        public static @tag("~")   void tilde(El e) { }
-        public static @tag("^^")  void doublecaret(El e) { }
-        public static @tag("(")   void subexpression(Seq[][] rhs) { }
+        // below is ugly voodoo which will go away very soon.  ignore it.
+        TreeFunctor tf = (TreeFunctor)tree.head();
+        Math.Expr e = (Math.Expr)tf.invoke(tree);
+        // above is ugly voodoo which will go away very soon.  ignore it.
 
-        public static @nonterminal("Word")    String word(String s) { return null; }
-        public static @nonterminal("Quoted")  String quoted(String s) { return null; }
-        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"; }
+        System.out.println("done!");
+        System.out.println(Reflection.show(e));
     }
-
+    */
 }