checkpoint

[sbp.git] / src / edu / berkeley / sbp / misc / MetaGrammar.java

diff --git a/src/edu/berkeley/sbp/misc/MetaGrammar.java b/src/edu/berkeley/sbp/misc/MetaGrammar.java
index ab359c6..d631e8a 100644 (file)
--- a/src/edu/berkeley/sbp/misc/MetaGrammar.java
+++ b/src/edu/berkeley/sbp/misc/MetaGrammar.java
@@ -51,15 +51,6 @@ public class MetaGrammar extends ReflectiveWalker {
 
     // MetaGrammar //////////////////////////////////////////////////////////////////////////////
 
-    public PreSequence _amp_(PreSequence p, Object[] o)        { return p.and(new PreSequence(o, null).buildSequence(null, true, false)); }
-    public PreSequence _amp__tilde_(PreSequence p, Object[] o) { return p.not(new PreSequence(o, null).buildSequence(null, true, false)); }
-    public Element     epsilon(Object o, Object b)                                    { return Union.epsilon; }
-    public Object      _leftparen__rightparen_(Object o)                              { return Union.epsilon; }
-    public Element     _rightparen_(Object e)                                         { return SELF; }
-    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); }
-    public Object      _leftparen_(PreSequence[][] p)                                 { return nonTerminal("anon"+(anon++), p, false, false); }
     public Union       nonTerminal(String str, PreSequence[][] s, boolean synthetic, boolean dropAll) {
         Union n = str.equals(startSymbol) ? g : nt.get(str);
         if (n == null) nt.put(str, n = new Union(str, synthetic));
@@ -87,20 +78,15 @@ public class MetaGrammar extends ReflectiveWalker {
                                new PreSequence[] {
                                    new PreSequence(new Element[] { leftBrace(),
                                                                    p.buildUnion(),
-                                                                   rightBrace() })
+                                                                   rightBrace()
+                                   })
                                }
                            },
                            false,
                            false);
     }
 
-    public PreSequence rewrite(Object[] o)                     { return new PreSequence(o, null); }
-
-    public PreSequence seqx(PreSequence p, String tag) { return _equals__greater_(p, tag); }
-    public PreSequence _equals__greater_(PreSequence p, String tag) {
-        p.tag = tag;
-        return p;
-    }
+    public PreSequence _equals__greater_(PreSequence p, String tag) { p.tag = tag; return p; }
 
     public PreSequence ps(Object[] o) { return new PreSequence(o); }
     public PreSequence ps2(Object[] o1, String s, Object[] o2) {
@@ -116,20 +102,40 @@ public class MetaGrammar extends ReflectiveWalker {
     }
     public PreSequence _slash_(PreSequence p, Object sep) { return p.sparse(sep); }
 
-    public Object      _star_(Element r)                    { return Repeat.many0(r); }
-    public Object   _plus_(final Element r)                 { return Repeat.many1(r); }
-    public Object _plus__slash_(final Element r, Element s) { return Repeat.many1(r, s); }
-    public Object _star__slash_(final Element r, Element s) { return Repeat.many0(r, s); }
-    public Object _star__star_(final Element r)             { return Repeat.maximal(Repeat.many0(r)); }
-    public Object _plus__plus_(final Element r)             { return Repeat.maximal(Repeat.many1(r)); }
-    public Element _question_(final Element r)              { return Repeat.maybe(r); }
-
-    public MetaGrammar gram(Object o, MetaGrammar g, Object o2) { return g; }
-    public MetaGrammar  grammar(Object[] o) { return this; }
-    public MetaGrammar grammar(Object o, Union[] u, Object x) { return this; }
-    public char    _backslash_n() { return '\n'; }
-    public char    _backslash_r() { return '\r'; }
-    public Element    literal(String s) { Element ret = string(s); dropAll.add(ret); return ret; }
+    public String string(Tree<String> tree) {
+        String ret = "";
+        if (tree.head()!=null) ret += tree.head();
+        for(Tree<String> t : tree.children()) ret += string(t);
+        return ret;
+    }
+
+    public Object walk(Tree<String> tree) {
+        String head = tree.head();
+        if (tree.numChildren()==0) return super.walk(tree);
+        if      ("\\n".equals(head)) return new Character('\n');
+        else if ("\\r".equals(head)) return new Character('\r');
+        else if ("grammar".equals(head)) { for(Tree<String> t : tree.children()) walk(t); return this; }
+        else if ("*".equals(head))  return Repeat.many0((Element)walk(tree.child(0)));
+        else if ("+".equals(head))  return Repeat.many1((Element)walk(tree.child(0)));
+        else if ("+/".equals(head)) return Repeat.many1((Element)walk(tree.child(0)), (Element)walk(tree.child(1)));
+        else if ("*/".equals(head)) return Repeat.many0((Element)walk(tree.child(0)), (Element)walk(tree.child(1)));
+        else if ("**".equals(head)) return Repeat.maximal(Repeat.many0((Element)walk(tree.child(0))));
+        else if ("++".equals(head)) return Repeat.maximal(Repeat.many1((Element)walk(tree.child(0))));
+        else if ("?".equals(head))  return Repeat.maybe((Element)walk(tree.child(0)));
+        else if ("&".equals(head)) return ((PreSequence)walk(tree,0)).and(new PreSequence((Element[])Reflection.lub((Object[])walk(tree, 1)), null).buildSequence(null, true, false));
+        else if ("&~".equals(head)) return ((PreSequence)walk(tree,0)).not(new PreSequence((Element[])Reflection.lub((Object[])walk(tree, 1)), null).buildSequence(null, true, false));
+        else if ("epsilon".equals(head)) return Union.epsilon;
+        else if ("()".equals(head)) return Union.epsilon;
+        else if (")".equals(head)) return SELF;
+        else if ("nonTerminal".equals(head)) return nonTerminal(string(tree.child(0)), null, false, false);
+        else if ("::=".equals(head)) return nonTerminal(string(tree.child(0)), (PreSequence[][])walk(tree, 1), false, false);
+        else if ("!::=".equals(head)) return nonTerminal(string(tree.child(0)), (PreSequence[][])walk(tree, 1), false, true);
+        else if ("(".equals(head)) return nonTerminal("anon"+(anon++), (PreSequence[][])walk(tree, 0), false, false);
+        else return super.walk(tree);
+    }
+
+    public Object    gram(Object o, Object g, Object o2) { return g; }
+    public Element   literal(String s) { Element ret = string(s); dropAll.add(ret); return ret; }
     public Range     _minus_(char a, char b) { return new Range(a, b); }
     public Range     range(char a)         { return new Range(a, a); }
     public Element   _leftbracket_       (Range[] rr) { return ranges(true, rr); }
@@ -143,6 +149,8 @@ public class MetaGrammar extends ReflectiveWalker {
         return set(ret);
     }
 
+    //////////////////////////////////////////////////////////////////////////////
+
     public class PreSequence {
         public final HashSet<Sequence> and  = new HashSet<Sequence>();
         public final HashSet<Sequence> not  = new HashSet<Sequence>();