duke@1: /*
xdono@117:  * Copyright 2002-2008 Sun Microsystems, Inc.  All Rights Reserved.
duke@1:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@1:  *
duke@1:  * This code is free software; you can redistribute it and/or modify it
duke@1:  * under the terms of the GNU General Public License version 2 only, as
duke@1:  * published by the Free Software Foundation.  Sun designates this
duke@1:  * particular file as subject to the "Classpath" exception as provided
duke@1:  * by Sun in the LICENSE file that accompanied this code.
duke@1:  *
duke@1:  * This code is distributed in the hope that it will be useful, but WITHOUT
duke@1:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@1:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
duke@1:  * version 2 for more details (a copy is included in the LICENSE file that
duke@1:  * accompanied this code).
duke@1:  *
duke@1:  * You should have received a copy of the GNU General Public License version
duke@1:  * 2 along with this work; if not, write to the Free Software Foundation,
duke@1:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@1:  *
duke@1:  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
duke@1:  * CA 95054 USA or visit www.sun.com if you need additional information or
duke@1:  * have any questions.
duke@1:  */
duke@1: 
duke@1: package com.sun.tools.javac.parser;
duke@1: 
duke@1: import com.sun.tools.javac.util.Context;
duke@1: import com.sun.tools.javac.util.Log;
duke@1: import com.sun.tools.javac.util.Name;
jjg@113: import com.sun.tools.javac.util.Names;
duke@1: 
duke@1: import static com.sun.tools.javac.parser.Token.*;
duke@1: 
duke@1: /**
duke@1:  * Map from Name to Token and Token to String.
duke@1:  *
duke@1:  * <p><b>This is NOT part of any API supported by Sun Microsystems.
duke@1:  * If you write code that depends on this, you do so at your own risk.
duke@1:  * This code and its internal interfaces are subject to change or
duke@1:  * deletion without notice.</b>
duke@1:  */
duke@1: public class Keywords {
duke@1:     public static final Context.Key<Keywords> keywordsKey =
duke@1:         new Context.Key<Keywords>();
duke@1: 
duke@1:     public static Keywords instance(Context context) {
duke@1:         Keywords instance = context.get(keywordsKey);
duke@1:         if (instance == null)
duke@1:             instance = new Keywords(context);
duke@1:         return instance;
duke@1:     }
duke@1: 
jjg@113:     private final Names names;
duke@1: 
duke@1:     protected Keywords(Context context) {
duke@1:         context.put(keywordsKey, this);
jjg@113:         names = Names.instance(context);
duke@1: 
duke@1:         for (Token t : Token.values()) {
duke@1:             if (t.name != null)
duke@1:                 enterKeyword(t.name, t);
duke@1:             else
duke@1:                 tokenName[t.ordinal()] = null;
duke@1:         }
duke@1: 
duke@1:         key = new Token[maxKey+1];
duke@1:         for (int i = 0; i <= maxKey; i++) key[i] = IDENTIFIER;
duke@1:         for (Token t : Token.values()) {
duke@1:             if (t.name != null)
jjg@113:                 key[tokenName[t.ordinal()].getIndex()] = t;
duke@1:         }
duke@1:     }
duke@1: 
duke@1: 
duke@1:     public Token key(Name name) {
jjg@113:         return (name.getIndex() > maxKey) ? IDENTIFIER : key[name.getIndex()];
duke@1:     }
duke@1: 
duke@1:     /**
duke@1:      * Keyword array. Maps name indices to Token.
duke@1:      */
duke@1:     private final Token[] key;
duke@1: 
duke@1:     /**  The number of the last entered keyword.
duke@1:      */
duke@1:     private int maxKey = 0;
duke@1: 
duke@1:     /** The names of all tokens.
duke@1:      */
duke@1:     private Name[] tokenName = new Name[Token.values().length];
duke@1: 
duke@1:     private void enterKeyword(String s, Token token) {
duke@1:         Name n = names.fromString(s);
duke@1:         tokenName[token.ordinal()] = n;
jjg@113:         if (n.getIndex() > maxKey) maxKey = n.getIndex();
duke@1:     }
duke@1: }