X-Git-Url: http://git.megacz.com/?p=sbp.git;a=blobdiff_plain;f=src%2Fedu%2Fberkeley%2Fsbp%2Fmisc%2FMetaGrammar.java;h=cb67cba9a2b36e3ccf4a64173a85021defd9bf36;hp=900ee3f497112e11fe94c2c1f5027bb154c53c66;hb=cb5151d11037144c14809f6516ce5c1f1976ef7f;hpb=fc28000b13f531d55e0509a596ce5ad96c63bbf2

diff --git a/src/edu/berkeley/sbp/misc/MetaGrammar.java b/src/edu/berkeley/sbp/misc/MetaGrammar.java
index 900ee3f..cb67cba 100644
--- a/src/edu/berkeley/sbp/misc/MetaGrammar.java
+++ b/src/edu/berkeley/sbp/misc/MetaGrammar.java
@@ -30,7 +30,6 @@ public class MetaGrammar extends ReflectiveWalker {
     private Union g;
     private HashMap<String,Union> nt;
     private int anon = 0;
-    private Element dws;
     private String startSymbol;
 
     public MetaGrammar() { this("s"); }
@@ -43,24 +42,20 @@ public class MetaGrammar extends ReflectiveWalker {
         nt = new HashMap<String,Union>();
         dropAll = new HashSet<Element>();
         nt.put(str, g);
-        this.dws = Repeat.maximal(Repeat.many0(nonTerminal("w")));
         return ret;
     }
+
+
     // MetaGrammar //////////////////////////////////////////////////////////////////////////////
 
-    public PreSequence _equals__greater_(Object[] o, String s)                        { return new PreSequence(o, s); }
+    public PreSequence _amp_(PreSequence p, Object[] o)        { return p.and(new PreSequence(o, null, true).buildSequence(null, true, false)); }
+    public PreSequence _amp__tilde_(PreSequence p, Object[] o) { return p.not(new PreSequence(o, null, true).buildSequence(null, true, false)); }
     public Object      _star_(Element r)                                              { return Repeat.many0(r); }
     public Element     epsilon(Object o, Object b)                                    { return epsilon; }
     public Element     _rightparen_(Object e)                                         { return SELF; }
-
-    public PreSequence _amp_(PreSequence p, Object[] o)        { return p.and(new PreSequence(o, null, true).buildSequence(null, true, false)); }
-    public PreSequence _amp__tilde_(PreSequence p, Object[] o) { return p.not(new PreSequence(o, null, true).buildSequence(null, true, false)); }
-
-    public Element     _bang_(Element r)                       { return r; }
-    public Object      care(String s)                          { return new MyLift(s); }
-    public Object      _caret_(String s)                       { return new MyLift(s); }
-    public Object      _leftparen__rightparen_()               { return epsilon; }
-        
+    public Element     _bang_(Element r)                                              { return r; }
+    public Object      _caret_(String s)                                              { return new MyLift(s); }
+    public Object      _leftparen__rightparen_()                                      { return epsilon; }
     public Union       nonTerminal(String s)                                          { return nonTerminal(s, null, false, false); }
     public Union       _colon__colon__equals_(String s, PreSequence[][] p)            { return nonTerminal(s, p, false, false); }
     public Union       _bang__colon__colon__equals_(String s, PreSequence[][] p)      { return nonTerminal(s, p, false, true); }
@@ -86,10 +81,13 @@ public class MetaGrammar extends ReflectiveWalker {
         return n;
     }
 
-
     public Object   _backslash__leftbrace_(String s)      { return SELF; }
     public Object   _leftbrace_(String s)                 { return SELF; }
     public Object   _plus_(final Element r) { return Repeat.many1(r); }
+
+    public PreSequence rewrite(Object[] o)                                            { return new PreSequence(o, null); }
+    public PreSequence _equals__greater_(Object[] o, String s)                        { return new PreSequence(o, s); }
+    public Object[] seq(Object[] o) { return o; }
     public Object[] _slash_(Object[] o, Object sep) {
         if (o.length <= 1) return o;
         Object[] ret = new Object[o.length * 2 - 1];
@@ -113,21 +111,18 @@ public class MetaGrammar extends ReflectiveWalker {
     public char    _backslash_r() { return '\r'; }
     public Object    literal(String s) { return new MyDrop(CharToken.string(s)); }
     public Range     _minus_(char a, char b) { return new Range(a, b); }
-    public Element   _leftbracket_       (Range[] rr) { return ranges(null, rr); }
-    public Element   _leftbracket__tilde_(Range[] rr) { return ranges("~",  rr); }
     public Range     range(char a)         { return new Range(a, a); }
-    public Element   ranges(Object o, Range[] rr) {
-        Range.Set ret = !"~".equals(o+"") ? new Range.Set() : new Range.Set(new Range(true, true));
+    public Element   _leftbracket_       (Range[] rr) { return ranges(true, rr); }
+    public Element   _leftbracket__tilde_(Range[] rr) { return ranges(false,  rr); }
+    public Element   ranges(boolean positive, Range[] rr) {
+        Range.Set ret = positive ? new Range.Set() : new Range.Set(new Range(true, true));
         if (rr != null)
             for(Range r : rr)
-                if (!"~".equals(o+"")) ret.add(r);
-                else                   ret.remove(r);
+                if (positive) ret.add(r);
+                else          ret.remove(r);
         return CharToken.set(ret);
     }
 
-    public PreSequence wrap(Object[] o)    { return new PreSequence(o, ""); }
-    public PreSequence rewrite(Object[] o) { return new PreSequence(o, null); }
-
     public static class MyLift {
         public final String s;
         public MyLift(String s) { this.s = s; }
@@ -149,25 +144,6 @@ public class MetaGrammar extends ReflectiveWalker {
         public PreSequence(Object[] o, String tag) { this(o, tag, false); }
         public PreSequence(Object[] o, String tag, boolean keeper) { this.o = o; this.tag = tag; this.keeper = keeper; }
         boolean[] drops = null;
-        public Element[] expand(Union u, HashSet<Sequence> set) {
-            if (o==null) return new Element[0];
-            Element[] o2 = new Element[o.length];
-            drops = new boolean[o.length];
-            int j = 0;
-            for(int i=0; i<o.length; i++) {
-                Object oi = o[i];
-                if (oi instanceof MyDrop)      { oi = ((MyDrop)oi).o; drops[j] = true; }
-                if (oi==SELF)                    o2[j] = u.new Subset("(("+u+"))", set);
-                else if (oi instanceof MyLift) { o2[j] = CharToken.string(tag = ((MyLift)oi).s); drops[j] = true; }
-                else                             o2[j] = (Element)oi;
-
-                if (dropAll.contains(o2[j])) drops[j] = true;
-
-                o2[j] = o2[j];
-                j++;
-            }
-            return o2;
-        }
         public Union    buildUnion() {
             Union u = new Union("???");
             u.add(buildSequence(u));
@@ -178,13 +154,27 @@ public class MetaGrammar extends ReflectiveWalker {
             for(Sequence s : and) u.add(s);
             for(Sequence s : not) u.add(s);
             HashSet<Sequence> set = new HashSet<Sequence>();
-            Element[] expansion = expand(u, set);
+            Element[] o2 = o==null ? new Element[0] : new Element[o.length];
+            if (o != null) {
+                drops = new boolean[o.length];
+                int j = 0;
+                for(int i=0; i<o.length; i++) {
+                    Object oi = o[i];
+                    if (oi instanceof MyDrop)      { oi = ((MyDrop)oi).o; drops[j] = true; }
+
+                    if (oi==SELF)                    o2[j] = u.new Subset("(("+u+"))", set);
+                    else if (oi instanceof MyLift) { o2[j] = CharToken.string(tag = ((MyLift)oi).s); drops[j] = true; }
+                    else                             o2[j] = (Element)oi;
+
+                    if (MetaGrammar.dropAll.contains(o2[j])) drops[j] = true;
+                    o2[j] = o2[j];
+                    j++;
+                }
+            }
+            Element[] expansion = o2;
             boolean keeper = this.keeper;
             Sequence ret = dropAll || lame || keeper ? Sequence.drop(expansion, and, not, lame) : null;
-            if (ret==null && tag!=null) {
-                for(int i=0; i<expansion.length; i++) expansion[i] = expansion[i];
-                ret = Sequence.rewritingSequence(tag, expansion, drops, and, not);
-            }
+            if (ret==null && tag!=null) ret = Sequence.rewritingSequence(tag, expansion, drops, and, not);
             if (ret==null) {
                 int idx = -1;
                 for(int i=0; i<expansion.length; i++) {