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