/*
 [The "BSD license"]
 Copyright (c) 2011 Terence Parr
 All rights reserved.

 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions
 are met:

 1. Redistributions of source code must retain the above copyright
    notice, this list of conditions and the following disclaimer.
 2. Redistributions in binary form must reproduce the above copyright
    notice, this list of conditions and the following disclaimer in the
    documentation and/or other materials provided with the distribution.
 3. The name of the author may not be used to endorse or promote products
    derived from this software without specific prior written permission.

 THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package org.antlr.v4.runtime;

/** A token has properties: text, type, line, character position in the line
 *  (so we can ignore tabs), token channel, index, and source from which
 *  we obtained this token.
 */
public interface Token {
	public static final int INVALID_TYPE = 0;

    /** During lookahead operations, this "token" signifies we hit rule end ATN state
     *  and did not follow it despite needing to.
     */
    public static final int EPSILON = -2;

	public static final int MIN_USER_TOKEN_TYPE = 1;

    public static final int EOF = CharStream.EOF;

	/** All tokens go to the parser (unless skip() is called in that rule)
	 *  on a particular "channel".  The parser tunes to a particular channel
	 *  so that whitespace etc... can go to the parser on a "hidden" channel.
	 */
	public static final int DEFAULT_CHANNEL = 0;

	/** Anything on different channel than DEFAULT_CHANNEL is not parsed
	 *  by parser.
	 */
	public static final int HIDDEN_CHANNEL = 99;

	/** Get the text of the token */
	String getText();

	/** Get the token type of the token */
	int getType();

	/** The line number on which the 1st character of this token was matched,
	 *  line=1..n
	 */
	int getLine();

	/** The index of the first character of this token relative to the
	 *  beginning of the line at which it occurs, 0..n-1
	 */
	int getCharPositionInLine();

	/** Return the channel this token. Each token can arrive at the parser
	 *  on a different channel, but the parser only "tunes" to a single channel.
	 *  The parser ignores everything not on DEFAULT_CHANNEL.
	 */
	int getChannel();

	/** An index from 0..n-1 of the token object in the input stream.
	 *  This must be valid in order to print token streams and
	 *  use TokenRewriteStream.
	 *
	 *  Return -1 to indicate that this token was conjured up since
	 *  it doesn't have a valid index.
	 */
	int getTokenIndex();

	/** The starting character index of the token
	 *  This method is optional; return -1 if not implemented.
	 */
	int getStartIndex();

	/** The last character index of the token.
	 *  This method is optional; return -1 if not implemented.
	 */
	int getStopIndex();

	/** Where does this token come from? You can get the
	 *  character input stream from the token source.
	 */
	TokenSource getTokenSource();
}

@@ -2417,10 +2417,9 @@
 L = 
-99
+1
 ;%0A%0A%09

set hidden channel num to 1 not 99. default is chan 0