// $ANTLR 2.7.6 (2005-12-22): "ValidWhenParser.g" -> "ValidWhenLexer.java"$

/*
 * $Id: ValidWhenLexer.java 569606 2007-08-25 03:54:59Z pbenedict $
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.struts.validator.validwhen;

import java.util.Stack;
import org.apache.commons.validator.util.ValidatorUtils;


import java.io.InputStream;
import antlr.TokenStreamException;
import antlr.TokenStreamIOException;
import antlr.TokenStreamRecognitionException;
import antlr.CharStreamException;
import antlr.CharStreamIOException;
import antlr.ANTLRException;
import java.io.Reader;
import java.util.Hashtable;
import antlr.CharScanner;
import antlr.InputBuffer;
import antlr.ByteBuffer;
import antlr.CharBuffer;
import antlr.Token;
import antlr.CommonToken;
import antlr.RecognitionException;
import antlr.NoViableAltForCharException;
import antlr.MismatchedCharException;
import antlr.TokenStream;
import antlr.ANTLRHashString;
import antlr.LexerSharedInputState;
import antlr.collections.impl.BitSet;
import antlr.SemanticException;

public class ValidWhenLexer extends antlr.CharScanner implements ValidWhenParserTokenTypes, TokenStream
 {
public ValidWhenLexer(InputStream in) {
	this(new ByteBuffer(in));
}
public ValidWhenLexer(Reader in) {
	this(new CharBuffer(in));
}
public ValidWhenLexer(InputBuffer ib) {
	this(new LexerSharedInputState(ib));
}
public ValidWhenLexer(LexerSharedInputState state) {
	super(state);
	caseSensitiveLiterals = true;
	setCaseSensitive(false);
	literals = new Hashtable();
	literals.put(new ANTLRHashString("null", this), new Integer(11));
	literals.put(new ANTLRHashString("or", this), new Integer(16));
	literals.put(new ANTLRHashString("and", this), new Integer(15));
}

public Token nextToken() throws TokenStreamException {
	Token theRetToken=null;
tryAgain:
	for (;;) {
		Token _token = null;
		int _ttype = Token.INVALID_TYPE;
		resetText();
		try {   // for char stream error handling
			try {   // for lexical error handling
				switch ( LA(1)) {
				case '\t':  case '\n':  case '\r':  case ' ':
				{
					mWS(true);
					theRetToken=_returnToken;
					break;
				}
				case '-':  case '1':  case '2':  case '3':
				case '4':  case '5':  case '6':  case '7':
				case '8':  case '9':
				{
					mDECIMAL_LITERAL(true);
					theRetToken=_returnToken;
					break;
				}
				case '"':  case '\'':
				{
					mSTRING_LITERAL(true);
					theRetToken=_returnToken;
					break;
				}
				case '[':
				{
					mLBRACKET(true);
					theRetToken=_returnToken;
					break;
				}
				case ']':
				{
					mRBRACKET(true);
					theRetToken=_returnToken;
					break;
				}
				case '(':
				{
					mLPAREN(true);
					theRetToken=_returnToken;
					break;
				}
				case ')':
				{
					mRPAREN(true);
					theRetToken=_returnToken;
					break;
				}
				case '*':
				{
					mTHIS(true);
					theRetToken=_returnToken;
					break;
				}
				case '.':  case '_':  case 'a':  case 'b':
				case 'c':  case 'd':  case 'e':  case 'f':
				case 'g':  case 'h':  case 'i':  case 'j':
				case 'k':  case 'l':  case 'm':  case 'n':
				case 'o':  case 'p':  case 'q':  case 'r':
				case 's':  case 't':  case 'u':  case 'v':
				case 'w':  case 'x':  case 'y':  case 'z':
				{
					mIDENTIFIER(true);
					theRetToken=_returnToken;
					break;
				}
				case '=':
				{
					mEQUALSIGN(true);
					theRetToken=_returnToken;
					break;
				}
				case '!':
				{
					mNOTEQUALSIGN(true);
					theRetToken=_returnToken;
					break;
				}
				default:
					if ((LA(1)=='0') && (LA(2)=='x')) {
						mHEX_LITERAL(true);
						theRetToken=_returnToken;
					}
					else if ((LA(1)=='<') && (LA(2)=='=')) {
						mLESSEQUALSIGN(true);
						theRetToken=_returnToken;
					}
					else if ((LA(1)=='>') && (LA(2)=='=')) {
						mGREATEREQUALSIGN(true);
						theRetToken=_returnToken;
					}
					else if ((LA(1)=='0') && (true)) {
						mOCTAL_LITERAL(true);
						theRetToken=_returnToken;
					}
					else if ((LA(1)=='<') && (true)) {
						mLESSTHANSIGN(true);
						theRetToken=_returnToken;
					}
					else if ((LA(1)=='>') && (true)) {
						mGREATERTHANSIGN(true);
						theRetToken=_returnToken;
					}
				else {
					if (LA(1)==EOF_CHAR) {uponEOF(); _returnToken = makeToken(Token.EOF_TYPE);}
				else {throw new NoViableAltForCharException((char)LA(1), getFilename(), getLine(), getColumn());}
				}
				}
				if ( _returnToken==null ) continue tryAgain; // found SKIP token
				_ttype = _returnToken.getType();
				_ttype = testLiteralsTable(_ttype);
				_returnToken.setType(_ttype);
				return _returnToken;
			}
			catch (RecognitionException e) {
				throw new TokenStreamRecognitionException(e);
			}
		}
		catch (CharStreamException cse) {
			if ( cse instanceof CharStreamIOException ) {
				throw new TokenStreamIOException(((CharStreamIOException)cse).io);
			}
			else {
				throw new TokenStreamException(cse.getMessage());
			}
		}
	}
}

	public final void mWS(boolean _createToken) throws RecognitionException, CharStreamException, TokenStreamException {
		int _ttype; Token _token=null; int _begin=text.length();
		_ttype = WS;
		int _saveIndex;
		
		{
		int _cnt15=0;
		_loop15:
		do {
			switch ( LA(1)) {
			case ' ':
			{
				match(' ');
				break;
			}
			case '\t':
			{
				match('\t');
				break;
			}
			case '\n':
			{
				match('\n');
				break;
			}
			case '\r':
			{
				match('\r');
				break;
			}
			default:
			{
				if ( _cnt15>=1 ) { break _loop15; } else {throw new NoViableAltForCharException((char)LA(1), getFilename(), getLine(), getColumn());}
			}
			}
			_cnt15++;
		} while (true);
		}
		_ttype = Token.SKIP;
		if ( _createToken && _token==null && _ttype!=Token.SKIP ) {
			_token = makeToken(_ttype);
			_token.setText(new String(text.getBuffer(), _begin, text.length()-_begin));
		}
		_returnToken = _token;
	}
	
	public final void mDECIMAL_LITERAL(boolean _createToken) throws RecognitionException, CharStreamException, TokenStreamException {
		int _ttype; Token _token=null; int _begin=text.length();
		_ttype = DECIMAL_LITERAL;
		int _saveIndex;
		
		{
		switch ( LA(1)) {
		case '-':
		{
			match('-');
			break;
		}
		case '1':  case '2':  case '3':  case '4':
		case '5':  case '6':  case '7':  case '8':
		case '9':
		{
			break;
		}
		default:
		{
			throw new NoViableAltForCharException((char)LA(1), getFilename(), getLine(), getColumn());
		}
		}
		}
		{
		matchRange('1','9');
		}
		{
		_loop20:
		do {
			if (((LA(1) >= '0' && LA(1) <= '9'))) {
				matchRange('0','9');
			}
			else {
				break _loop20;
			}
			
		} while (true);
		}
		if ( _createToken && _token==null && _ttype!=Token.SKIP ) {
			_token = makeToken(_ttype);
			_token.setText(new String(text.getBuffer(), _begin, text.length()-_begin));
		}
		_returnToken = _token;
	}
	
	public final void mHEX_LITERAL(boolean _createToken) throws RecognitionException, CharStreamException, TokenStreamException {
		int _ttype; Token _token=null; int _begin=text.length();
		_ttype = HEX_LITERAL;
		int _saveIndex;
		
		match('0');
		match('x');
		{
		int _cnt23=0;
		_loop23:
		do {
			switch ( LA(1)) {
			case '0':  case '1':  case '2':  case '3':
			case '4':  case '5':  case '6':  case '7':
			case '8':  case '9':
			{
				matchRange('0','9');
				break;
			}
			case 'a':  case 'b':  case 'c':  case 'd':
			case 'e':  case 'f':
			{
				matchRange('a','f');
				break;
			}
			default:
			{
				if ( _cnt23>=1 ) { break _loop23; } else {throw new NoViableAltForCharException((char)LA(1), getFilename(), getLine(), getColumn());}
			}
			}
			_cnt23++;
		} while (true);
		}
		if ( _createToken && _token==null && _ttype!=Token.SKIP ) {
			_token = makeToken(_ttype);