| /* ConfigFileTokenizer.java -- JAAS Login Configuration default syntax tokenizer |
| Copyright (C) 2006 Free Software Foundation, Inc. |
| |
| This file is part of GNU Classpath. |
| |
| GNU Classpath is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2, or (at your option) |
| any later version. |
| |
| GNU Classpath 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 for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GNU Classpath; see the file COPYING. If not, write to the |
| Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 02110-1301 USA. |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| |
| |
| package gnu.javax.security.auth.login; |
| |
| import gnu.java.security.Configuration; |
| |
| import java.io.BufferedReader; |
| import java.io.IOException; |
| import java.io.Reader; |
| import java.util.logging.Logger; |
| |
| /** |
| * A UTF-8 friendly, JAAS Login Module Configuration file tokenizer written in |
| * the deault syntax. This class emulates, to a certain extent, the behavior of |
| * a {@link java.io.StreamTokenizer} instance <code>st</code>, when set as |
| * follows: |
| * |
| * <pre> |
| * st.resetSyntax(); |
| * st.lowerCaseMode(false); |
| * st.slashSlashComments(true); |
| * st.slashStarComments(true); |
| * st.eolIsSignificant(false); |
| * st.wordChars('_', '_'); |
| * st.wordChars('$', '$'); |
| * st.wordChars('A', 'Z'); |
| * st.wordChars('a', 'z'); |
| * st.wordChars('0', '9'); |
| * st.wordChars('.', '.'); |
| * st.whitespaceChars(' ', ' '); |
| * st.whitespaceChars('\t', '\t'); |
| * st.whitespaceChars('\f', '\f'); |
| * st.whitespaceChars('\r', '\r'); |
| * st.whitespaceChars('\n', '\n'); |
| * st.quoteChar('"'); |
| * st.quoteChar('\''); |
| * </pre> |
| * |
| * <p>The most important (negative) difference with a |
| * {@link java.io.StreamTokenizer} is that this tokenizer does not properly |
| * handle C++ and Java // style comments in the middle of the line. It only |
| * ignores them if/when found at the start of the line.</p> |
| */ |
| public class ConfigFileTokenizer |
| { |
| private static final Logger log = Logger.getLogger(ConfigFileParser.class.getName()); |
| /** A constant indicating that the end of the stream has been read. */ |
| public static final int TT_EOF = -1; |
| /** A constant indicating that a word token has been read. */ |
| public static final int TT_WORD = -3; |
| /** A constant indicating that no tokens have been read yet. */ |
| private static final int TT_NONE = -4; |
| |
| public String sval; |
| public int ttype; |
| |
| private BufferedReader br; |
| boolean initialised; |
| private StringBuffer sb; |
| private int sbNdx; |
| |
| // Constructor(s) |
| // -------------------------------------------------------------------------- |
| |
| /** Trivial constructor. */ |
| ConfigFileTokenizer(Reader r) |
| { |
| super(); |
| |
| br = r instanceof BufferedReader ? (BufferedReader) r : new BufferedReader(r); |
| initialised = false; |
| } |
| |
| // Class methods |
| // -------------------------------------------------------------------------- |
| |
| // Instance methods |
| // -------------------------------------------------------------------------- |
| |
| public int nextToken() throws IOException |
| { |
| if (!initialised) |
| init(); |
| |
| if (sbNdx >= sb.length()) |
| return TT_EOF; |
| |
| skipWhitespace(); |
| |
| if (sbNdx >= sb.length()) |
| return TT_EOF; |
| |
| int endNdx; |
| if (Character.isJavaIdentifierPart(sb.charAt(sbNdx))) |
| { |
| endNdx = sbNdx + 1; |
| while (Character.isJavaIdentifierPart(sb.charAt(endNdx)) |
| || sb.charAt(endNdx) == '.') |
| endNdx++; |
| |
| ttype = TT_WORD; |
| sval = sb.substring(sbNdx, endNdx); |
| sbNdx = endNdx; |
| return ttype; |
| } |
| |
| int c = sb.charAt(sbNdx); |
| if (c == '{' || c == '}' || c == ';' || c == '=') |
| { |
| ttype = c; |
| sbNdx++; |
| return ttype; |
| } |
| |
| if (c == '"' || c == '\'') |
| { |
| ttype = c; |
| String quote = sb.substring(sbNdx, sbNdx + 1); |
| int i = sbNdx + 1; |
| while (true) |
| { |
| // find a candidate |
| endNdx = sb.indexOf(quote, i); |
| if (endNdx == -1) |
| abort("Missing closing quote: " + quote); |
| |
| // found one; is it escaped? |
| if (sb.charAt(endNdx - 1) != '\\') |
| break; |
| |
| i++; |
| continue; |
| } |
| |
| endNdx++; |
| sval = sb.substring(sbNdx, endNdx); |
| sbNdx = endNdx; |
| return ttype; |
| } |
| |
| abort("Unknown character: " + sb.charAt(sbNdx)); |
| return Integer.MIN_VALUE; |
| } |
| |
| public void pushBack() |
| { |
| sbNdx -= ttype != TT_WORD ? 1 : sval.length(); |
| } |
| |
| private void init() throws IOException |
| { |
| sb = new StringBuffer(); |
| String line; |
| while ((line = br.readLine()) != null) |
| { |
| line = line.trim(); |
| if (line.length() == 0) |
| continue; |
| |
| if (line.startsWith("#") || line.startsWith("//")) |
| continue; |
| |
| sb.append(line).append(" "); |
| } |
| |
| sbNdx = 0; |
| sval = null; |
| ttype = TT_NONE; |
| |
| initialised = true; |
| } |
| |
| private void skipWhitespace() throws IOException |
| { |
| int endNdx; |
| while (sbNdx < sb.length()) |
| if (Character.isWhitespace(sb.charAt(sbNdx))) |
| { |
| sbNdx++; |
| while (sbNdx < sb.length() && Character.isWhitespace(sb.charAt(sbNdx))) |
| sbNdx++; |
| |
| continue; |
| } |
| else if (sb.charAt(sbNdx) == '/' && sb.charAt(sbNdx + 1) == '*') |
| { |
| endNdx = sb.indexOf("*/", sbNdx + 2); |
| if (endNdx == -1) |
| abort("Missing closing */ sequence"); |
| |
| sbNdx = endNdx + 2; |
| continue; |
| } |
| else |
| break; |
| } |
| |
| private void abort(String m) throws IOException |
| { |
| if (Configuration.DEBUG) |
| { |
| log.fine(m); |
| log.fine("sb = " + sb); |
| log.fine("sbNdx = " + sbNdx); |
| } |
| throw new IOException(m); |
| } |
| } |