StreamIn.java example

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/**
 * Copyright (c) 2009 Juwi MacMillan Group GmbH
 *
 * Licensed 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.
 */
/*
 * @(#)StreamIn.java   1.11 2000/08/16
 *
 */

package org.tizzit.util.tidy;

/**
 *
 * Input Stream
 *
 * (c) 1998-2000 (W3C) MIT, INRIA, Keio University
 * Derived from <a href="http://www.w3.org/People/Raggett/tidy">
 * HTML Tidy Release 4 Aug 2000</a>
 *
 * @author  Dave Raggett <dsr@w3.org>
 * @author  Andy Quick <ac.quick@sympatico.ca> (translation to Java)
 * @version 1.0, 1999/05/22
 * @version 1.0.1, 1999/05/29
 * @version 1.1, 1999/06/18 Java Bean
 * @version 1.2, 1999/07/10 Tidy Release 7 Jul 1999
 * @version 1.3, 1999/07/30 Tidy Release 26 Jul 1999
 * @version 1.4, 1999/09/04 DOM support
 * @version 1.5, 1999/10/23 Tidy Release 27 Sep 1999
 * @version 1.6, 1999/11/01 Tidy Release 22 Oct 1999
 * @version 1.7, 1999/12/06 Tidy Release 30 Nov 1999
 * @version 1.8, 2000/01/22 Tidy Release 13 Jan 2000
 * @version 1.9, 2000/06/03 Tidy Release 30 Apr 2000
 * @version 1.10, 2000/07/22 Tidy Release 8 Jul 2000
 * @version 1.11, 2000/08/16 Tidy Release 4 Aug 2000
 */

import java.io.InputStream;

public abstract class StreamIn {

	public static final int EndOfStream = -1; // EOF

	/* states for ISO 2022 

	 A document in ISO-2022 based encoding uses some ESC sequences called 
	 "designator" to switch character sets. The designators defined and 
	 used in ISO-2022-JP are:

	 "ESC" + "(" + ?     for ISO646 variants

	 "ESC" + "$" + ?     and
	 "ESC" + "$" + "(" + ?   for multibyte character sets
	 */

	public static final int FSM_ASCII = 0;
	public static final int FSM_ESC = 1;
	public static final int FSM_ESCD = 2;
	public static final int FSM_ESCDP = 3;
	public static final int FSM_ESCP = 4;
	public static final int FSM_NONASCII = 5;

	/* non-raw input is cleaned up*/
	public int state; /* FSM for ISO2022 */
	public boolean pushed;
	public int c;
	public int tabs;
	public int tabsize;
	public int lastcol;
	public int curcol;
	public int curline;
	public int encoding;
	public InputStream stream;
	public boolean endOfStream;
	public Object lexer; /* needed for error reporting */

	/* read char from stream */
	public abstract int readCharFromStream();

	public abstract int readChar();

	public abstract void ungetChar(int c);

	public abstract boolean isEndOfStream();

}