private boolean isLiteral(int token) {
	switch(token) {
		case TerminalTokens.TokenNameIntegerLiteral:
		case TerminalTokens.TokenNameLongLiteral:
		case TerminalTokens.TokenNameFloatingPointLiteral:
		case TerminalTokens.TokenNameDoubleLiteral:
		case TerminalTokens.TokenNameStringLiteral:
		case TerminalTokens.TokenNameCharacterLiteral:
			return true;
		default:
			return false;
	}
}