if(id >= INTERNAL_FIRST && id != Token.END)
if(id >= Token.INTERNAL_FIRST && id <= Token.INTERNAL_LAST)
	protected void addToken(int length, byte id)	{		if(id >= INTERNAL_FIRST && id != Token.END)			throw new InternalError("Invalid id: " + id);		if(firstToken == null)		{			firstToken = new Token(length,id);			lastToken = firstToken;		}		else if(lastToken == null)		{			lastToken = firstToken;			firstToken.length = length;			firstToken.id = id;		}		else if(lastToken.next == null)		{			lastToken.next = new Token(length,id);			lastToken = lastToken.next;		}		else		{			lastToken = lastToken.next;			lastToken.length = length;			lastToken.id = id;		}	}