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  Copyright (c) 2005-2009 Terence Parr
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package org.antlr.runtime;

When walking ahead with cyclic DFA or for syntactic predicates, we need to record the state of the input stream (char index, line, etc...) so that we can rewind the state after scanning ahead. This is the complete state of a stream.
public class CharStreamState {
Index into the char stream of next lookahead char
	int p;

What line number is the scanner at before processing buffer[p]?
	int line;

What char position 0..n-1 in line is scanner before processing buffer[p]?
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