| 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 | */ |
| 25 | |
| 26 | package com.sun.tools.javac.parser; |
| 27 | |
| 28 | import com.sun.tools.javac.util.Context; |
| 29 | import com.sun.tools.javac.util.Log; |
| 30 | import com.sun.tools.javac.util.Name; |
| 31 | |
| 32 | import static com.sun.tools.javac.parser.Token.*; |
| 33 | |
| 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>(); |
| 45 | |
| 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 | } |
| 52 | |
| 53 | private final Log log; |
| 54 | private final Name.Table names; |
| 55 | |
| 56 | protected Keywords(Context context) { |
| 57 | context.put(keywordsKey, this); |
| 58 | log = Log.instance(context); |
| 59 | names = Name.Table.instance(context); |
| 60 | |
| 61 | for (Token t : Token.values()) { |
| 62 | if (t.name != null) |
| 63 | enterKeyword(t.name, t); |
| 64 | else |
| 65 | tokenName[t.ordinal()] = null; |
| 66 | } |
| 67 | |
| 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 | } |
| 75 | |
| 76 | |
| 77 | public Token key(Name name) { |
| 78 | return (name.index > maxKey) ? IDENTIFIER : key[name.index]; |
| 79 | } |
| 80 | |
| 81 | /** |
| 82 | * Keyword array. Maps name indices to Token. |
| 83 | */ |
| 84 | private final Token[] key; |
| 85 | |
| 86 | /** The number of the last entered keyword. |
| 87 | */ |
| 88 | private int maxKey = 0; |
| 89 | |
| 90 | /** The names of all tokens. |
| 91 | */ |
| 92 | private Name[] tokenName = new Name[Token.values().length]; |
| 93 | |
| 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 | } |
| 121 | |
| 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 | } |