/*
* Copyright (c) 2002, 2006, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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*/
package com.sun.tools.javac.parser;
import com.sun.tools.javac.util.Context;
import com.sun.tools.javac.util.Log;
import com.sun.tools.javac.util.Name;
import static com.sun.tools.javac.parser.Token.*;
/**
* Map from Name to Token and Token to String.
*
* <p><b>This is NOT part of any supported API.
* If you write code that depends on this, you do so at your own risk.
* This code and its internal interfaces are subject to change or
* deletion without notice.</b>
*/
public class Keywords {
public static final Context.Key<Keywords> keywordsKey =
new Context.Key<Keywords>();
public static Keywords instance(Context context) {
Keywords instance = context.get(keywordsKey);
if (instance == null)
instance = new Keywords(context);
return instance;
}
private final Log log;
private final Name.Table names;
protected Keywords(Context context) {
context.put(keywordsKey, this);
log = Log.instance(context);
names = Name.Table.instance(context);
for (Token t : Token.values()) {
if (t.name != null)
enterKeyword(t.name, t);
else
tokenName[t.ordinal()] = null;
}
key = new Token[maxKey+1];
for (int i = 0; i <= maxKey; i++) key[i] = IDENTIFIER;
for (Token t : Token.values()) {
if (t.name != null)
key[tokenName[t.ordinal()].index] = t;
}
}
public Token key(Name name) {
return (name.index > maxKey) ? IDENTIFIER : key[name.index];
}
/**
* Keyword array. Maps name indices to Token.
*/
private final Token[] key;
/** The number of the last entered keyword.
*/
private int maxKey = 0;
/** The names of all tokens.
*/
private Name[] tokenName = new Name[Token.values().length];
public String token2string(Token token) {
switch (token) {
case IDENTIFIER:
return log.getLocalizedString("token.identifier");
case CHARLITERAL:
return log.getLocalizedString("token.character");
case STRINGLITERAL:
return log.getLocalizedString("token.string");
case INTLITERAL:
return log.getLocalizedString("token.integer");
case LONGLITERAL:
return log.getLocalizedString("token.long-integer");
case FLOATLITERAL:
return log.getLocalizedString("token.float");
case DOUBLELITERAL:
return log.getLocalizedString("token.double");
case ERROR:
return log.getLocalizedString("token.bad-symbol");
case EOF:
return log.getLocalizedString("token.end-of-input");
case DOT: case COMMA: case SEMI: case LPAREN: case RPAREN:
case LBRACKET: case RBRACKET: case LBRACE: case RBRACE:
return "'" + token.name + "'";
default:
return token.name;
}
}
private void enterKeyword(String s, Token token) {
Name n = names.fromString(s);
tokenName[token.ordinal()] = n;
if (n.index > maxKey) maxKey = n.index;
}
}