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
  57
  58     public static class Production {
  59         public String tag;
  60         public String nonTerminal;
  61         public boolean[] drops;
  62         public Element[] elements;
  63         public int count = 0;
  64         public Production(String tag, String nonTerminal, Element[] elements, boolean[] drops) {
  65             this.tag = tag;
  66             this.elements = elements;
  67             this.nonTerminal = nonTerminal;
  68             this.drops = drops;
  69             for(int i=0; i<drops.length; i++)
  70                 if (!drops[i])
  71                     count++;
  72         }
  73     }
  74
  75     public static class Target {
  76         public int[] buildSequence(Production p) {
  77             Annotation[][] annotations = _bindable.getArgAnnotations();
  78             Class[]        types       = _bindable.getArgTypes();
  79             String[]       names       = _bindable.getArgNames();
  80             String name                = _bindable.getSimpleName();
  81             int len                    = annotations.length;
  82             int ofs                    = 0;
  83             bind.arg[] argtags  = new bind.arg[len];
  84             for(int i=0; i<names.length; i++)
  85                 for(Annotation a : annotations[i+ofs])
  86                     if (a instanceof bind.arg)
  87                         argtags[i+ofs] = (bind.arg)a;
  88             return Target.this.buildSequence(p, names, argtags, types);
  89         }
  90         private Bindable _bindable;
  91
  92         public Target(Object o) { this(Bindable.create(o)); }
  93         public Target(Bindable b) { this._bindable = b; }
  94
  95         public String getName() { return _bindable.getSimpleName(); }
  96         public bind getBind() { return (bind)_bindable.getAnnotation(bind.class); }
  97         public bind.as getBindAs() { return (bind.as)_bindable.getAnnotation(bind.as.class); }
  98         public String toString() { return _bindable.getSimpleName(); }
  99         public boolean isRaw() { return _bindable.isAnnotationPresent(bind.raw.class); }
 100
 101         public boolean isCompatible(Production p) {
 102             bind.as t = getBindAs();
 103             bind b = getBind();
 104
 105             if (t != null &&
 106                 (t.value().equals(p.tag)))
 107                 return buildSequence(p)!=null;
 108
 109             if (t != null &&
 110                 ((t.value().equals("") && getName().equals(p.tag))))
 111                 return buildSequence(p)!=null;
 112             if (b != null && getName().equals(p.tag))
 113                 return buildSequence(p)!=null;
 114
 115             if (t != null &&
 116                 (t.value().equals(p.nonTerminal)))
 117                 return buildSequence(p)!=null;
 118             if (t != null &&
 119                 ((t.value().equals("") && getName().equals(p.nonTerminal))))
 120                 return buildSequence(p)!=null;
 121             if (b != null && getName().equals(p.nonTerminal))
 122                 return buildSequence(p)!=null;
 123
 124             return false;
 125         }
 126
 127         public int[] buildSequence(Production p, String[] names, bind.arg[] argtags, Class[] types) {
 128             int argTagged = 0;
 129             boolean hasloc = types.length>0 && types[0]==Input.Region.class;
 130             for(int i=0; i<argtags.length; i++) {
 131                 if (i==0 && types[0]==Input.Region.class) continue;
 132                 if (argtags[i] != null)
 133                     argTagged++;
 134             }
 135             int numNames = names.length;
 136             if (hasloc) numNames--;
 137
 138             // FIXME: can be smarter here
 139             if (argTagged==p.count) {
 140                 int[] ret = new int[argtags.length];
 141                 int j = 0;
 142                 for(int i=0; i<argtags.length; i++) {
 143                     if (i==0 && types[0]==Input.Region.class) continue;
 144                     if (argtags[i]==null) continue;
 145                     if (argtags[i].value().equals(""))
 146                         ret[i] = j++;
 147                     else {
 148                         ret[i] = -1;
 149                         for(int k=0; k<names.length; k++)
 150                             if (argtags[i].value().equals(names[k])){
 151                                 ret[i] = k;
 152                                 break;
 153                             }
 154                         if (ret[i]==-1) return null;
 155                     }
 156                 }
 157                 return ret;
 158             } else if (numNames==p.count) {
 159                 int[] ret = new int[p.count];
 160                 for(int i=0; i<p.count; i++) ret[i] = i+(hasloc?1:0);
 161                 return ret;
 162             } else {
 163                 return null;
 164             }
 165         }
 166         public Sequence makeSequence(Production p) {
 167             return Sequence.rewritingSequence(new TargetReducer(buildSequence(p), _bindable, isRaw()),
 168                                               p.elements, p.drops);
 169         }
 170
 171     }
 172
 173     public static class TargetReducer implements Tree.TreeFunctor<Object,Object>, ToJava {
 174         private int[] map;
 175         private Bindable _bindable;
 176         private boolean _israw;
 177
 178         public void toJava(StringBuffer sb) {
 179             sb.append("new MetaGrammar.TargetReducer(new int[] {");
 180             for(int i=0; i<map.length; i++) sb.append((i+"")+(i<map.length-1 ? "," : ""));
 181             sb.append("}, ");
 182             _bindable.toJava(sb);
 183             sb.append(", ");
 184             sb.append(_israw ? "true" : "false");
 185             sb.append(")");
 186         }
 187
 188         public TargetReducer(int[] map, Bindable b, boolean raw) {
 189             this.map = map;
 190             this._bindable = b;
 191             this._israw = raw;
 192         }
 193         public String toString() { return "reducer-"+_bindable.toString(); }
 194         public Object invoke(Tree<Object> t) {
 195             if (_israw) return _bindable.impose(new Object[] { t });
 196             ArrayList ret = new ArrayList();
 197             for(Tree tc : t) {
 198                 if (tc.head() != null && tc.head() instanceof Functor)
 199                     ret.add(((Tree.TreeFunctor<Object,Object>)tc.head()).invoke(tc));
 200                 else if (tc.numChildren() == 0)
 201                     ret.add(tc.head());
 202                 else {
 203                     System.err.println("FIXME: don't know what to do about " + tc);
 204                     ret.add(null);
 205                 }
 206             }
 207             Object[] o = (Object[])ret.toArray(new Object[0]);
 208             int max = 0;
 209             for(int i=0; i<map.length; i++) max = Math.max(map[i], max);
 210             if (_bindable.getArgTypes().length > 0 &&
 211                 _bindable.getArgTypes()[0]==Input.Region.class)
 212                 max++;
 213             Object[] o2 = new Object[max+1];
 214             for(int i=0; i<o.length; i++) o2[map[i]] = o[i];
 215             if (_bindable.getArgTypes().length > 0 &&
 216                 _bindable.getArgTypes()[0]==Input.Region.class)
 217                 o2[0] = t.getRegion();
 218             return _bindable.impose(o2);
 219         }
 220     }
 221
 222
 223     public static Union make() { return make(MetaGrammarTree.meta, "s"); }
 224     public static Union make(Tree t, String s) { return make(t, s, new AnnotationGrammarBindingResolver(MetaGrammarBindings.class)); }
 225     public static Union make(Tree t, String s, GrammarBindingResolver rm) {
 226         Tree.TreeFunctor<Object,Object> red = (Tree.TreeFunctor<Object,Object>)t.head();
 227         MetaGrammarBindings.GrammarNode g = (MetaGrammarBindings.GrammarNode)red.invoke(t);
 228         return g.build(s, rm);
 229     }
 230
 231 }