X-Git-Url: http://git.megacz.com/?p=sbp.git;a=blobdiff_plain;f=src%2Fedu%2Fberkeley%2Fsbp%2Fmeta%2FMetaGrammarBindings.java;h=c7952b0beebb46e4d1aa80d0c5ef7a2cd5cbae55;hp=d33758c87374e7bb3818ff0e8fff7b2384fb869c;hb=0dd3f65037405b4a9dd03d1825b30a6557433892;hpb=f3b4ef0d81d572694905f4fe284cac6311a29ea4

diff --git a/src/edu/berkeley/sbp/meta/MetaGrammarBindings.java b/src/edu/berkeley/sbp/meta/MetaGrammarBindings.java
index d33758c..c7952b0 100644
--- a/src/edu/berkeley/sbp/meta/MetaGrammarBindings.java
+++ b/src/edu/berkeley/sbp/meta/MetaGrammarBindings.java
@@ -12,9 +12,15 @@ import java.io.*;
 /** The java classes typically used to represent a parsed grammar AST; each inner class is a type of AST node. */
 public class MetaGrammarBindings {
 
+    // FIXME ugly ugly ugly scary dangerous
+    public static String prefix = "";
+
     /** A grammar (a set of nonterminals) */
-    public static class GrammarNode extends HashMap<String,NonTerminalNode> {
-        public @bind.as("Grammar") GrammarNode(NonTerminalNode[] nonterminals) {
+    public static class GrammarNode extends HashMap<String,NonTerminalNode> implements NonTerminalSource {
+        public NonTerminalNode[] getNonTerminals() {
+            return (NonTerminalNode[])values().toArray(new NonTerminalNode[0]);
+        }
+        public GrammarNode(NonTerminalNode[] nonterminals) {
             for(NonTerminalNode nt : nonterminals) {
                 if (nt==null) continue;
                 if (this.get(nt.name)!=null)
@@ -22,6 +28,22 @@ public class MetaGrammarBindings {
                 this.put(nt.name, nt);
             }
         }
+        public @bind.as("Grammar") GrammarNode(Object[] nt) {
+            add(nt);
+        }
+        private void add(Object[] obs) {
+            for(Object o : obs) {
+                if (o==null) continue;
+                else if (o instanceof Object[]) add((Object[])o);
+                else if (o instanceof NonTerminalNode) {
+                    NonTerminalNode nt = (NonTerminalNode)o;
+                    if (this.get(nt.name)!=null)
+                        throw new RuntimeException("duplicate definition of nonterminal \""+nt.name+"\"");
+                    this.put(nt.name, nt);
+                }
+                else if (o instanceof NonTerminalSource) add(((NonTerminalSource)o).getNonTerminals());
+            }
+        }
         public String toString() {
             String ret = "[ ";
             for(NonTerminalNode nt : values()) ret += nt + ", ";
@@ -63,22 +85,42 @@ public class MetaGrammarBindings {
         }
     }
 
-    public static @bind.as("#import") NonTerminalNode poundimport(String fileName) {
-        System.err.println("#import " + fileName);
-        return null;
+    public static @bind.as("#import") GrammarNode poundimport(String fileName, String as) {
+        if (as==null) as = "";
+        else if ("".equals(as)) { }
+        else as = as +".";
+        
+        System.err.println("#import " + fileName + " as " + as);
+        try {
+            Tree t = new CharParser(MetaGrammar.make()).parse(new FileInputStream(fileName)).expand1();
+            Tree.TreeFunctor<Object,Object> red = (Tree.TreeFunctor<Object,Object>)t.head();
+            String oldprefix = prefix;
+            prefix = as;
+            GrammarNode gn = (GrammarNode)red.invoke(t);
+            prefix = oldprefix;
+            return gn;
+        } catch (Exception e) {
+            e.printStackTrace();
+            throw new RuntimeException(e);
+        }
+    }
+
+    public static interface NonTerminalSource {
+        public NonTerminalNode[] getNonTerminals();
     }
 
-    public static class NonTerminalNode extends UnionNode {
+    public static class NonTerminalNode extends UnionNode implements NonTerminalSource {
         public boolean rep;
         public String  name = null;
         public String sep = null;
+        public NonTerminalNode[] getNonTerminals() { return new NonTerminalNode[] { this }; }
         public @bind.as("NonTerminal") NonTerminalNode(@bind.arg String name, @bind.arg Seq[][] sequences) { this(name, sequences, false); }
         public NonTerminalNode(String name, Seq[][] sequences, boolean rep) { this(name, sequences, rep, null); }
         public NonTerminalNode(String name, Seq[][] sequences, boolean rep, String sep) {
-            this.name = name;
+            this.name = prefix + name;
             this.sequences = sequences;
             this.rep = rep;
-            this.sep = sep;
+            this.sep = prefix + sep;
         }
         public Element build(Context cx, NonTerminalNode cnt) { return cx.get(name); }
         public void build(Context cx, Union u, NonTerminalNode cnt) {
@@ -175,14 +217,14 @@ public class MetaGrammarBindings {
         }
         public Seq(ElementNode e) { this(new ElementNode[] { e }); }
         public Seq(ElementNode[] elements) { this.elements = elements; }
-        public Seq tag(String tag) { this.tag = tag; return this; }
+        public Seq tag(String tag) { this.tag = prefix+tag; return this; }
         public Seq follow(ElementNode follow) { this.follow = follow; return this; }
         public Seq dup() {
             Seq ret = new Seq(elements);
             ret.and.addAll(and);
             ret.not.addAll(not);
             ret.follow = follow;
-            ret.tag = tag;
+            ret.tag = prefix+tag;
             return ret;
         }
         public Seq and(Seq s) { and.add(s); s.lame = true; return this; }
@@ -207,7 +249,7 @@ public class MetaGrammarBindings {
         }
         public Sequence build0(Context cx, boolean lame, NonTerminalNode cnt) {
             boolean dropAll = lame;
-            if (tag!=null && "()".equals(tag)) dropAll = true;
+            if (tag!=null && tag.endsWith("()")) dropAll = true;
             boolean[] drops = new boolean[elements.length];
             Element[] els = new Element[elements.length];
             for(int i=0; i<elements.length; i++) {
@@ -249,11 +291,16 @@ public class MetaGrammarBindings {
     public static @bind.as(")")   void close(String foo)                 { throw new Error("not supported"); }
     public static @bind.as("()")  ElementNode   epsilon()                         { return new Constant(Union.epsilon); }
 
-    public static @bind.as("NonTerminalReference") class NonTerminalReferenceNode extends ElementNode {
-        public @bind.arg String nonTerminal;
+    public static class NonTerminalReferenceNode extends ElementNode {
+        public String nonTerminal;
+        public NonTerminalReferenceNode() { }
+        public @bind.as("NonTerminalReference") NonTerminalReferenceNode(String nonTerminal) {
+            this.nonTerminal = prefix + nonTerminal;
+        }
         public Element build(Context cx, NonTerminalNode cnt) {
+            if (!this.nonTerminal.startsWith(prefix)) nonTerminal = prefix + nonTerminal;
             Element ret = cx.get(nonTerminal);
-            if (ret == null) throw new RuntimeException("unkown nonterminal \""+nonTerminal+"\"");
+            if (ret == null) throw new RuntimeException("unknown nonterminal \""+nonTerminal+"\"");
             return ret;
         }
     }
@@ -317,21 +364,31 @@ public class MetaGrammarBindings {
     }
 
     // FIXME: it would be nice if we could hoist this into "Rep"
-    public static @bind.as("++")  ElementNode plusmax(final ElementNode e)                     { return new Rep(e, null, false, true, true); }
-    public static @bind.as("+")   ElementNode plus(final ElementNode e)                        { return new Rep(e, null, false, true, false); }
-    public static @bind.as("++/") ElementNode plusmaxfollow(final ElementNode e, final ElementNode sep) { return new Rep(e, sep,  false, true, true); }
-    public static @bind.as("+/")  ElementNode plusfollow(final ElementNode e, final ElementNode sep)    { return new Rep(e, sep,  false, true, false); }
-    public static @bind.as("**")  ElementNode starmax(final ElementNode e)                     { return new Rep(e, null, true,  true, true); }
-    public static @bind.as("*")   ElementNode star(final ElementNode e)                        { return new Rep(e, null, true,  true, false); }
-    public static @bind.as("**/") ElementNode starmaxfollow(final ElementNode e, final ElementNode sep) { return new Rep(e, sep,  true,  true, true); }
-    public static @bind.as("*/")  ElementNode starfollow(final ElementNode e, final ElementNode sep)    { return new Rep(e, sep,  true,  true, false); }
-    public static @bind.as("?")   ElementNode question(final ElementNode e)                    { return new Rep(e, null, true,  true, false); }
-
-    public static @bind.as("!")   ElementNode bang(final ElementNode e)                        { return new Drop(e); }
+    public static @bind.as("++")  ElementNode plusmax(final ElementNode e)                     
+    { return new Rep(e, null, false, true, true); }
+    public static @bind.as("+")   ElementNode plus(final ElementNode e)                        
+    { return new Rep(e, null, false, true, false); }
+    public static @bind.as("++/") ElementNode plusmaxfollow(final ElementNode e, final ElementNode sep) 
+    { return new Rep(e, sep,  false, true, true); }
+    public static @bind.as("+/")  ElementNode plusfollow(final ElementNode e, final ElementNode sep)    
+    { return new Rep(e, sep,  false, true, false); }
+    public static @bind.as("**")  ElementNode starmax(final ElementNode e)                     
+    { return new Rep(e, null, true,  true, true); }
+    public static @bind.as("*")   ElementNode star(final ElementNode e)                        
+    { return new Rep(e, null, true,  true, false); }
+    public static @bind.as("**/") ElementNode starmaxfollow(final ElementNode e, final ElementNode sep) 
+    { return new Rep(e, sep,  true,  true, true); }
+    public static @bind.as("*/")  ElementNode starfollow(final ElementNode e, final ElementNode sep)    
+    { return new Rep(e, sep,  true,  true, false); }
+    public static @bind.as("?")   ElementNode question(final ElementNode e)                    
+    { return new Rep(e, null, true,  true, false); }
+    public static @bind.as("!")   ElementNode bang(final ElementNode e)                        
+    { return new Drop(e); }
 
     public static @bind.as("^")   ElementNode caret(final String s) {
+        final String thePrefix = prefix;
         return new Drop(new Constant(CharRange.string(s)) {
-                public String getOwnerTag() { return s; }
+                public String getOwnerTag() { return thePrefix+s; }
             });
     }
 
@@ -383,7 +440,8 @@ public class MetaGrammarBindings {
             map.put(name, ret);
             NonTerminalNode nt = grammar.get(name);
             if (nt==null) {
-                System.err.println("*** warning could not find " + name);
+                //System.err.println("*** warning could not find " + name);
+                throw new Error("warning could not find " + name);
             } else {
                 String old = cnt;
                 cnt = name;