/*
 [The "BSD license"]
 Copyright (c) 2005-2009 Terence Parr
 All rights reserved.

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 1. Redistributions of source code must retain the above copyright
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     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
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 IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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package org.antlr.runtime;

A source of characters for an ANTLR lexer /** A source of characters for an ANTLR lexer */
public interface CharStream extends IntStream {
    public static final int EOF = -1;

	
For infinite streams, you don't need this; primarily I'm providing
 a useful interface for action code.  Just make sure actions don't
 use this on streams that don't support it.
/** For infinite streams, you don't need this; primarily I'm providing
	 *  a useful interface for action code.  Just make sure actions don't
	 *  use this on streams that don't support it.
	 */
	public String substring(int start, int stop);

	
Get the ith character of lookahead.  This is the same usually as
 LA(i).  This will be used for labels in the generated
 lexer code.  I'd prefer to return a char here type-wise, but it's
 probably better to be 32-bit clean and be consistent with LA.
/** Get the ith character of lookahead.  This is the same usually as
	 *  LA(i).  This will be used for labels in the generated
	 *  lexer code.  I'd prefer to return a char here type-wise, but it's
	 *  probably better to be 32-bit clean and be consistent with LA.
	 */
	public int LT(int i);

	
ANTLR tracks the line information automatically /** ANTLR tracks the line information automatically */
	int getLine();

	
Because this stream can rewind, we need to be able to reset the line /** Because this stream can rewind, we need to be able to reset the line */
	void setLine(int line);

	void setCharPositionInLine(int pos);

	
The index of the character relative to the beginning of the line 0..n-1 /** The index of the character relative to the beginning of the line 0..n-1 */
	int getCharPositionInLine();
}