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package com.sun.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();
}
};
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