@Override
	public void reset() {
		prevAccept.reset();
		startIndex = -1;
		line = 1;
		charPositionInLine = 0;
		mode = Lexer.DEFAULT_MODE;
	}
Used during DFA/ATN exec to record the most recent accept configuration info
runtime/Java/src/org/antlr/v4/runtime/atn/LexerATNSimulator.java