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 | } |