1 files changed, 132 insertions, 0 deletions
diff --git a/src/net/java/games/gluegen/cgram/CSymbolTable.java b/src/net/java/games/gluegen/cgram/CSymbolTable.java
new file mode 100644
index 000000000..e22274b90
--- /dev/null
+++ b/src/net/java/games/gluegen/cgram/CSymbolTable.java
@@ -0,0 +1,132 @@
+package net.java.games.gluegen.cgram;
+
+import java.util.Vector;
+import java.util.Hashtable;
+import java.util.Enumeration;
+
+
+
+public class CSymbolTable {
+
+  /** holds list of scopes */
+  private Vector scopeStack;
+
+  /** table where all defined names are mapped to TNode tree nodes */
+  private Hashtable symTable;
+
+  public CSymbolTable()  {
+    scopeStack = new Vector(10);
+    symTable = new Hashtable(533);
+  }
+
+
+  /** push a new scope onto the scope stack.
+    */
+  public void pushScope(String s) {
+      //System.out.println("push scope:" + s);
+    scopeStack.addElement(s);
+  }
+
+  /** pop the last scope off the scope stack.
+    */
+  public void popScope() {
+      //System.out.println("pop scope");
+    int size = scopeStack.size();
+    if(size > 0)
+      scopeStack.removeElementAt(size - 1);
+  }
+
+  /** return the current scope as a string 
+   */
+  public String currentScopeAsString() {
+      StringBuffer buf = new StringBuffer(100);
+      boolean first = true;
+      Enumeration e = scopeStack.elements();
+      while(e.hasMoreElements()) {
+        if(first) 
+          first = false;
+        else
+          buf.append("::");
+        buf.append(e.nextElement().toString());
+      }
+      return buf.toString();
+  }
+
+  /** given a name for a type, append it with the 
+    current scope.
+    */
+  public String addCurrentScopeToName(String name) {
+    String currScope = currentScopeAsString();
+    return addScopeToName(currScope, name);
+  }
+
+  /** given a name for a type, append it with the 
+    given scope.  MBZ
+    */
+  public String addScopeToName(String scope, String name) {
+    if(scope == null || scope.length() > 0)
+      return scope + "::" + name;
+    else
+      return name;
+  }
+
+  /** remove one level of scope from name MBZ*/
+  public String removeOneLevelScope(String scopeName) {
+    int index = scopeName.lastIndexOf("::");
+    if (index > 0) {
+      return scopeName.substring(0,index);
+    }
+    if (scopeName.length() > 0) {
+        return "";
+    }
+    return null;
+  }
+  
+  /** add a node to the table with it's key as
+    the current scope and the name */
+  public TNode add(String name, TNode node) {
+    return (TNode)symTable.put(addCurrentScopeToName(name),node);
+  }
+
+
+  /** lookup a fully scoped name in the symbol table */
+  public TNode lookupScopedName(String scopedName) {
+    return (TNode)symTable.get(scopedName);
+  }
+
+  /** lookup an unscoped name in the table by prepending
+    the current scope.
+    MBZ -- if not found, pop scopes and look again
+    */
+  public TNode lookupNameInCurrentScope(String name) {
+    String scope = currentScopeAsString();
+    String scopedName;
+    TNode tnode = null;
+
+    //System.out.println( "\n"+ this.toString() );
+
+    while (tnode == null && scope != null) {
+      scopedName = addScopeToName(scope, name);
+      //System.out.println("lookup trying " + scopedName);
+      tnode = (TNode)symTable.get(scopedName);
+      scope = removeOneLevelScope(scope);
+    }
+    return tnode;
+  }
+
+  /** convert this table to a string */
+  public String toString() {
+    StringBuffer buff = new StringBuffer(300);
+    buff.append("CSymbolTable { \nCurrentScope: " + currentScopeAsString() + 
+                "\nDefinedSymbols:\n");
+    Enumeration ke = symTable.keys();
+    Enumeration ve = symTable.elements();
+    while(ke.hasMoreElements()) {
+      buff.append(ke.nextElement().toString() + " (" + 
+                  TNode.getNameForType(((TNode)ve.nextElement()).getType()) + ")\n");
+    }
+    buff.append("}\n");
+    return buff.toString();
+  }
+
+};