src/edu/berkeley/sbp/meta/MetaGrammar.java

   1 package edu.berkeley.sbp.meta;
   2 import edu.berkeley.sbp.util.*;
   3 import edu.berkeley.sbp.*;
   4 import edu.berkeley.sbp.chr.*;
   5 import edu.berkeley.sbp.misc.*;
   6 import edu.berkeley.sbp.bind.*;
   7 import java.util.*;
   8 import java.lang.annotation.*;
   9 import java.lang.reflect.*;
  10 import java.io.*;
  11
  12 public class MetaGrammar {
  13
  14     public static void main(String[] args) throws Exception {
  15         if (args.length != 2) {
  16             System.err.println("usage: java " + MetaGrammar.class.getName() + " grammarfile.g com.yourdomain.package.ClassName");
  17             System.exit(-1);
  18         }
  19         String className   = args[1].substring(args[1].lastIndexOf('.')+1);
  20         String packageName = args[1].substring(0, args[1].lastIndexOf('.'));
  21         String fileName    = packageName.replace('.', '/') + "/" + className + ".java";
  22
  23         BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(fileName)));
  24         StringBuffer out = new StringBuffer();
  25
  26         boolean skip = false;
  27         for(String s = br.readLine(); s != null; s = br.readLine()) {
  28             if (s.indexOf("DO NOT EDIT STUFF BELOW: IT IS AUTOMATICALLY GENERATED") != -1 && s.indexOf("\"")==-1) skip = true;
  29             if (s.indexOf("DO NOT EDIT STUFF ABOVE: IT IS AUTOMATICALLY GENERATED") != -1 && s.indexOf("\"")==-1) break;
  30             if (!skip) out.append(s+"\n");
  31         }
  32
  33         out.append("\n        // DO NOT EDIT STUFF BELOW: IT IS AUTOMATICALLY GENERATED\n");
  34
  35         Tree t = MetaGrammarTree.meta;
  36         Union u = MetaGrammar.make(t, "s");
  37
  38         System.err.println();
  39         System.err.println("== parsing with parsed grammar =================================================================================");
  40         t = new CharParser((Union)u).parse(new FileInputStream(args[0])).expand1();
  41         System.out.println(t.toPrettyString());
  42
  43         t.toJava(out);
  44         out.append("\n        // DO NOT EDIT STUFF ABOVE: IT IS AUTOMATICALLY GENERATED\n");
  45
  46         for(String s = br.readLine(); s != null; s = br.readLine()) out.append(s+"\n");
  47         br.close();
  48
  49         OutputStream os = new FileOutputStream(fileName);
  50         PrintWriter p = new PrintWriter(new OutputStreamWriter(os));
  51         p.println(out.toString());
  52         p.flush();
  53         os.close();
  54     }
  55
  56     public static class TreeBindable {
  57
  58         private Bindable _bindable;
  59         public TreeBindable(Object o) { this(Bindable.create(o)); }
  60         public TreeBindable(Bindable b) { this._bindable = b; }
  61
  62         private int[] buildSequence(Production p) {
  63             return p.buildSequence(_bindable);
  64         }
  65
  66         public String  getName()   { return _bindable.getSimpleName(); }
  67         public bind    getBind()   { return (bind)_bindable.getAnnotation(bind.class); }
  68         public bind.as getBindAs() { return (bind.as)_bindable.getAnnotation(bind.as.class); }
  69         public String  toString()  { return _bindable.getSimpleName(); }
  70         public boolean isRaw()     { return _bindable.isAnnotationPresent(bind.raw.class); }
  71
  72         public boolean isCompatible(Production p) {
  73             bind.as t = getBindAs();
  74             bind b = getBind();
  75
  76             if (t != null &&
  77                 (t.value().equals(p.tag)))
  78                 return buildSequence(p)!=null;
  79
  80             if (t != null &&
  81                 ((t.value().equals("") && getName().equals(p.tag))))
  82                 return buildSequence(p)!=null;
  83             if (b != null && getName().equals(p.tag))
  84                 return buildSequence(p)!=null;
  85
  86             if (t != null &&
  87                 (t.value().equals(p.tag)))
  88                 return buildSequence(p)!=null;
  89             if (t != null &&
  90                 ((t.value().equals("") && getName().equals(p.tag))))
  91                 return buildSequence(p)!=null;
  92             if (b != null && getName().equals(p.tag))
  93                 return buildSequence(p)!=null;
  94
  95             return false;
  96         }
  97
  98         public Sequence makeSequence(final Production p) {
  99
 100             if (_bindable.getArgTypes().length > 0 &&
 101                 _bindable.getArgTypes()[0] == Input.Region.class) {
 102                 Functor<Input.Region,Object> func = new Functor<Input.Region,Object>() {
 103                     public Object invoke(final Input.Region region) {
 104                         return
 105                         new TreeBindableReducer(buildSequence(p),
 106                                                 _bindable,
 107                                                 isRaw()) {
 108                             public Object invoke(Iterable<Tree<Object>> t) {
 109                                 ArrayList ret = new ArrayList();
 110                                 ret.add(region);
 111                                 for(Tree tc : t) {
 112                                     if (tc.head() != null && tc.head() instanceof Functor)
 113                                         ret.add(((Tree.TreeFunctor<Object,Object>)tc.head()).invoke(tc.children()));
 114                                     else if (tc.numChildren() == 0)
 115                                         ret.add(tc.head());
 116                                     else {
 117                                         System.err.println("FIXME: don't know what to do about " + tc);
 118                                         ret.add(null);
 119                                     }
 120                                 }
 121                                 Object[] o = (Object[])ret.toArray(new Object[0]);
 122                                 int max = 0;
 123                                 for(int i=0; i<map.length; i++) max = Math.max(map[i], max);
 124                                 Object[] o2 = new Object[max+2];
 125                                 for(int i=0; i<o.length; i++) o2[map[i]+1] = o[i];
 126                                 o2[0] = region;
 127                                 return _bindable.impose(o2);
 128                             }
 129                         };
 130                     }
 131                 };
 132                 return Sequence.regionRewritingSequence(func,
 133                                                         p.elements,
 134                                                         p.drops);
 135             }
 136
 137             if (isRaw())
 138                 return Sequence.rewritingSequence(new Tree.BindingFunctor(_bindable.createBinding()),
 139                                                   p.elements,
 140                                                   p.drops);
 141             return Sequence.rewritingSequence(new TreeBindableReducer(buildSequence(p),
 142                                                                       _bindable),
 143                                               p.elements,
 144                                               p.drops);
 145         }
 146
 147     }
 148
 149     public static class TreeBindableReducer implements Tree.TreeFunctor<Object,Object>, ToJava {
 150          int[] map;
 151          Bindable _bindable;
 152
 153         public void toJava(StringBuffer sb) {
 154             sb.append("new MetaGrammar.TreeBindableReducer(new int[] {");
 155             for(int i=0; i<map.length; i++) sb.append((i+"")+(i<map.length-1 ? "," : ""));
 156             sb.append("}, ");
 157             _bindable.toJava(sb);
 158             sb.append(")");
 159         }
 160
 161         public TreeBindableReducer(int[] map, Bindable b) { this(map,b, false); }
 162         public TreeBindableReducer(int[] map, Bindable b, boolean raw) {
 163             this.map = map;
 164             this._bindable = b;
 165         }
 166         public String toString() { return "reducer-"+_bindable.toString(); }
 167         public Object invoke(Iterable<Tree<Object>> t) {
 168             ArrayList ret = new ArrayList();
 169             for(Tree tc : t) {
 170                 if (tc.head() != null && tc.head() instanceof Functor)
 171                     ret.add(((Tree.TreeFunctor<Object,Object>)tc.head()).invoke(tc.children()));
 172                 else if (tc.numChildren() == 0)
 173                     ret.add(tc.head());
 174                 else {
 175                     System.err.println("FIXME: don't know what to do about " + tc);
 176                     ret.add(null);
 177                 }
 178             }
 179             Object[] o = (Object[])ret.toArray(new Object[0]);
 180             return _bindable.createBinding(map).invoke(o);
 181         }
 182     }
 183
 184
 185     public static Union make() { return make(MetaGrammarTree.meta, "s"); }
 186     public static Union make(Tree t, String s) { return make(t, s, new AnnotationGrammarBindingResolver(MetaGrammarBindings.class)); }
 187     public static Union make(Tree t, String s, GrammarBindingResolver rm) {
 188         Tree.TreeFunctor<Object,Object> red = (Tree.TreeFunctor<Object,Object>)t.head();
 189         MetaGrammarBindings.GrammarNode g = (MetaGrammarBindings.GrammarNode)red.invoke(t.children());
 190         return g.build(s, rm);
 191     }
 192
 193 }