jdk8-mips64-public/langtools: src/share/classes/com/sun/tools/javac/parser/Keywords.java@9a66ca7c79fa

     1 /*

     2  * Copyright 2002-2006 Sun Microsystems, Inc.  All Rights Reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.  Sun designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Sun in the LICENSE file that accompanied this code.

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

    18  * 2 along with this work; if not, write to the Free Software Foundation,

    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    22  * CA 95054 USA or visit www.sun.com if you need additional information or

    23  * have any questions.

    24  */

    26 package com.sun.tools.javac.parser;

    28 import com.sun.tools.javac.util.Context;

    29 import com.sun.tools.javac.util.Log;

    30 import com.sun.tools.javac.util.Name;

    32 import static com.sun.tools.javac.parser.Token.*;

    34 /**

    35  * Map from Name to Token and Token to String.

    36  *

    37  * <p><b>This is NOT part of any API supported by Sun Microsystems.

    38  * If you write code that depends on this, you do so at your own risk.

    39  * This code and its internal interfaces are subject to change or

    40  * deletion without notice.</b>

    41  */

    42 public class Keywords {

    43     public static final Context.Key<Keywords> keywordsKey =

    44         new Context.Key<Keywords>();

    46     public static Keywords instance(Context context) {

    47         Keywords instance = context.get(keywordsKey);

    48         if (instance == null)

    49             instance = new Keywords(context);

    50         return instance;

    51     }

    53     private final Log log;

    54     private final Name.Table names;

    56     protected Keywords(Context context) {

    57         context.put(keywordsKey, this);

    58         log = Log.instance(context);

    59         names = Name.Table.instance(context);

    61         for (Token t : Token.values()) {

    62             if (t.name != null)

    63                 enterKeyword(t.name, t);

    64             else

    65                 tokenName[t.ordinal()] = null;

    66         }

    68         key = new Token[maxKey+1];

    69         for (int i = 0; i <= maxKey; i++) key[i] = IDENTIFIER;

    70         for (Token t : Token.values()) {

    71             if (t.name != null)

    72                 key[tokenName[t.ordinal()].index] = t;

    73         }

    74     }

    77     public Token key(Name name) {

    78         return (name.index > maxKey) ? IDENTIFIER : key[name.index];

    79     }

    81     /**

    82      * Keyword array. Maps name indices to Token.

    83      */

    84     private final Token[] key;

    86     /**  The number of the last entered keyword.

    87      */

    88     private int maxKey = 0;

    90     /** The names of all tokens.

    91      */

    92     private Name[] tokenName = new Name[Token.values().length];

    94     public String token2string(Token token) {

    95         switch (token) {

    96         case IDENTIFIER:

    97             return log.getLocalizedString("token.identifier");

    98         case CHARLITERAL:

    99             return log.getLocalizedString("token.character");

   100         case STRINGLITERAL:

   101             return log.getLocalizedString("token.string");

   102         case INTLITERAL:

   103             return log.getLocalizedString("token.integer");

   104         case LONGLITERAL:

   105             return log.getLocalizedString("token.long-integer");

   106         case FLOATLITERAL:

   107             return log.getLocalizedString("token.float");

   108         case DOUBLELITERAL:

   109             return log.getLocalizedString("token.double");

   110         case ERROR:

   111             return log.getLocalizedString("token.bad-symbol");

   112         case EOF:

   113             return log.getLocalizedString("token.end-of-input");

   114         case DOT: case COMMA: case SEMI: case LPAREN: case RPAREN:

   115         case LBRACKET: case RBRACKET: case LBRACE: case RBRACE:

   116             return "'" + token.name + "'";

   117         default:

   118             return token.name;

   119         }

   120     }

   122     private void enterKeyword(String s, Token token) {

   123         Name n = names.fromString(s);

   124         tokenName[token.ordinal()] = n;

   125         if (n.index > maxKey) maxKey = n.index;

   126     }

   127 }

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