001: /*
002: * Copyright 2002-2006 Sun Microsystems, Inc. All Rights Reserved.
003: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004: *
005: * This code is free software; you can redistribute it and/or modify it
006: * under the terms of the GNU General Public License version 2 only, as
007: * published by the Free Software Foundation. Sun designates this
008: * particular file as subject to the "Classpath" exception as provided
009: * by Sun in the LICENSE file that accompanied this code.
010: *
011: * This code is distributed in the hope that it will be useful, but WITHOUT
012: * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
013: * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
014: * version 2 for more details (a copy is included in the LICENSE file that
015: * accompanied this code).
016: *
017: * You should have received a copy of the GNU General Public License version
018: * 2 along with this work; if not, write to the Free Software Foundation,
019: * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
020: *
021: * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
022: * CA 95054 USA or visit www.sun.com if you need additional information or
023: * have any questions.
024: */
025:
026: package com.sun.tools.javac.parser;
027:
028: import com.sun.tools.javac.util.Context;
029: import com.sun.tools.javac.util.Log;
030: import com.sun.tools.javac.util.Name;
031: import com.sun.tools.javac.util.Version;
032:
033: import static com.sun.tools.javac.parser.Token.*;
034:
035: /**
036: * Map from Name to Token and Token to String.
037: *
038: * <p><b>This is NOT part of any API supported by Sun Microsystems.
039: * If you write code that depends on this, you do so at your own risk.
040: * This code and its internal interfaces are subject to change or
041: * deletion without notice.</b>
042: */
043: @Version("@(#)Keywords.java 1.23 07/05/05")
044: public class Keywords {
045: public static final Context.Key<Keywords> keywordsKey = new Context.Key<Keywords>();
046:
047: public static Keywords instance(Context context) {
048: Keywords instance = context.get(keywordsKey);
049: if (instance == null)
050: instance = new Keywords(context);
051: return instance;
052: }
053:
054: private final Log log;
055: private final Name.Table names;
056:
057: protected Keywords(Context context) {
058: context.put(keywordsKey, this );
059: log = Log.instance(context);
060: names = Name.Table.instance(context);
061:
062: for (Token t : Token.values()) {
063: if (t.name != null)
064: enterKeyword(t.name, t);
065: else
066: tokenName[t.ordinal()] = null;
067: }
068:
069: key = new Token[maxKey + 1];
070: for (int i = 0; i <= maxKey; i++)
071: key[i] = IDENTIFIER;
072: for (Token t : Token.values()) {
073: if (t.name != null)
074: key[tokenName[t.ordinal()].index] = t;
075: }
076: }
077:
078: public Token key(Name name) {
079: return (name.index > maxKey) ? IDENTIFIER : key[name.index];
080: }
081:
082: /**
083: * Keyword array. Maps name indices to Token.
084: */
085: private final Token[] key;
086:
087: /** The number of the last entered keyword.
088: */
089: private int maxKey = 0;
090:
091: /** The names of all tokens.
092: */
093: private Name[] tokenName = new Name[Token.values().length];
094:
095: public String token2string(Token token) {
096: switch (token) {
097: case IDENTIFIER:
098: return log.getLocalizedString("token.identifier");
099: case CHARLITERAL:
100: return log.getLocalizedString("token.character");
101: case STRINGLITERAL:
102: return log.getLocalizedString("token.string");
103: case INTLITERAL:
104: return log.getLocalizedString("token.integer");
105: case LONGLITERAL:
106: return log.getLocalizedString("token.long-integer");
107: case FLOATLITERAL:
108: return log.getLocalizedString("token.float");
109: case DOUBLELITERAL:
110: return log.getLocalizedString("token.double");
111: case ERROR:
112: return log.getLocalizedString("token.bad-symbol");
113: case EOF:
114: return log.getLocalizedString("token.end-of-input");
115: case DOT:
116: case COMMA:
117: case SEMI:
118: case LPAREN:
119: case RPAREN:
120: case LBRACKET:
121: case RBRACKET:
122: case LBRACE:
123: case RBRACE:
124: return "'" + token.name + "'";
125: default:
126: return token.name;
127: }
128: }
129:
130: private void enterKeyword(String s, Token token) {
131: Name n = names.fromString(s);
132: tokenName[token.ordinal()] = n;
133: if (n.index > maxKey)
134: maxKey = n.index;
135: }
136: }
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