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<H1>Re: [MUD-Dev] i got's a question for yall on the best way to do something..</H1>
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<LI><em>To</em>: <<A HREF="mailto:mud-dev#kanga,nu">mud-dev#kanga,nu</A>></LI>
<LI><em>Subject</em>: Re: [MUD-Dev] i got's a question for yall on the best way to do something..</LI>
<LI><em>From</em>: "Jim Clark" <<A HREF="mailto:somewhere#sprint,ca">somewhere#sprint,ca</A>></LI>
<LI><em>Date</em>: Thu, 17 Jun 1999 14:43:29 -0400</LI>
<LI><em>Reply-To</em>: <A HREF="mailto:mud-dev#kanga,nu">mud-dev#kanga,nu</A></LI>
<LI><em>Sender</em>: <A HREF="mailto:mud-dev-admin#kanga,nu">mud-dev-admin#kanga,nu</A></LI>
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<PRE>
You still want a state machine, but that horrible 1000 line switch is not
a good way to implement a state machine. The first step to make a decent
deterministic state machine would be to write down a list of states:
connect -> login -> new char -> new char passwd -> ect..
|
-----> old char -> get old char password -> playing
|
--> bad password
After you have a decent map of state transitions, you can get down
to the implementation. (It's been a few years since I did any large
state machines so bear with me)
First create a nice list of constants, one for each state.
const int STATE_CONNECT = 0;
const int STATE_LOGIN = 1;
const int STATE_OLD_CHAR = 2;
const int STATE_NEW_CHAR = 3;
ect..
const int MAX_STATE = 20; // Or whatever
Then make a large table which maps old state vs. next state.
With function pointers
const STATEHANDER STATE_TABLE[MAX_STATE][MAX_STATE] =
{
// Next State (the one we are moving to)
// Connect Login Old Char NewChar
/* Connect */ { NULL, Login, NULL, NULL },
/* Login */ { NULL, NULL, OldChar, NewChar },
/* Old Char */ { NULL, NULL, NULL, NULL },
/* New Char */ { NULL, NULL, NULL, NULL }
};
This table defines the links between states, as well as where to go next.
Some function such as this will handle that.
void HandleState( Ch* pCh, const String& strIn )
{
// I can't rember if this is the right member function
// syntax, and I'm to lazy to dig it up
// And you should of course check for NULL's
pCh->*( STATE_TABLE[pCh->m_nLastState][pCh->m_nCurrState] )( strIn );
}
And lastly an example of a STATEHANDLER, in psuado code
void Ch::Login( const String& strIn )
{
if( strIn IS AN old player )
m_nLastState = m_nCurrState;
m_nCurrState = STATE_OLD_CHAR;
Out( "some message about entering a password" );
}
else
{
m_nLastState = m_nCurrState;
m_nCurrState = STATE_NEW_CHAR;
Out( "some message about new characters and some instructions about
entering a new password" );
}
}
-Jim
----- Original Message -----
From: <PartyG2816#aol,com>
To: <mud-dev#kanga,nu>
Sent: Thursday, June 17, 1999 2:55 AM
Subject: [MUD-Dev] i got's a question for yall on the best way to do
something..
> Ok, any of yall familiar with the ROM code base? Tis a text based mud.
Well,
> they handle character creation via this big, ugly, confusing state
machine..
> Hard as hell to find stuff in, and just a bitch to look at. Well, I've
> finally got around to starting my own mud in C++, tired of modifying ROM's
> and Oblivions yadda yadda, and gotten to the point where I need to figure
out
> a way to handle this.. The only way I know of doing it is via a big ugly
> state machine like ROM and most of the other's that I've seen use.. Mainly
> the Diku derivatives. What are some other ways a person might go about
doing
> it? Any input would be greatly appreciated.. And if you need more info on
> what I'm talking about, just ask and I'll try to supply ;-)
>
> Thanx,
> JD
_______________________________________________
MUD-Dev maillist - MUD-Dev#kanga,nu
<A HREF="http://www.kanga.nu/lists/listinfo/mud-dev">http://www.kanga.nu/lists/listinfo/mud-dev</A>
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<LI><STRONG><A NAME="00834" HREF="msg00834.html">[MUD-Dev] i got's a question for yall on the best way to do something..</A></STRONG>
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<ul><li>Thread context:
<BLOCKQUOTE><UL>
<LI><STRONG>Re: [MUD-Dev] i got's a question for yall on the best way to dosomething..</STRONG>, <EM>(continued)</EM>
<ul compact>
<LI><strong><A NAME="00844" HREF="msg00844.html">Re: [MUD-Dev] i got's a question for yall on the best way to dosomething..</A></strong>,
PartyG2816 <a href="mailto:PartyG2816#aol,com">PartyG2816#aol,com</a>, Thu 17 Jun 1999, 23:36 GMT
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</ul>
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<LI><strong><A NAME="00841" HREF="msg00841.html">[MUD-Dev] Game Design [Simulation]</A></strong>,
Justin Lockshaw <a href="mailto:JustinL#HQ,Autoweb.com">JustinL#HQ,Autoweb.com</a>, Thu 17 Jun 1999, 21:48 GMT
<LI><strong><A NAME="00837" HREF="msg00837.html">RE: [MUD-Dev] Different approaches?</A></strong>,
Koster, Raph <a href="mailto:rkoster#origin,ea.com">rkoster#origin,ea.com</a>, Thu 17 Jun 1999, 18:31 GMT
<LI><strong><A NAME="00834" HREF="msg00834.html">[MUD-Dev] i got's a question for yall on the best way to do something..</A></strong>,
PartyG2816 <a href="mailto:PartyG2816#aol,com">PartyG2816#aol,com</a>, Thu 17 Jun 1999, 15:38 GMT
<UL>
<LI><strong><A NAME="00838" HREF="msg00838.html">Re: [MUD-Dev] i got's a question for yall on the best way to do something..</A></strong>,
Jim Clark <a href="mailto:somewhere#sprint,ca">somewhere#sprint,ca</a>, Thu 17 Jun 1999, 21:48 GMT
</LI>
<LI><strong><A NAME="00840" HREF="msg00840.html">Re: [MUD-Dev] i got's a question for yall on the best way to do something..</A></strong>,
Marc Hernandez <a href="mailto:marc#ias,jb.com">marc#ias,jb.com</a>, Thu 17 Jun 1999, 21:48 GMT
</LI>
</UL>
</LI>
<LI><strong><A NAME="00827" HREF="msg00827.html">[MUD-Dev] 3D Anarchy</A></strong>,
Adam Wiggins <a href="mailto:adam#angel,com">adam#angel,com</a>, Thu 17 Jun 1999, 15:37 GMT
<LI><strong><A NAME="00826" HREF="msg00826.html">[MUD-Dev] Properties of computer languages</A></strong>,
Caliban Tiresias Darklock <a href="mailto:caliban#darklock,com">caliban#darklock,com</a>, Thu 17 Jun 1999, 08:19 GMT
<UL>
<LI><strong><A NAME="00828" HREF="msg00828.html">Re: [MUD-Dev] Properties of computer languages</A></strong>,
Jon Leonard <a href="mailto:jleonard#frost,slimy.com">jleonard#frost,slimy.com</a>, Thu 17 Jun 1999, 15:38 GMT
</LI>
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</LI>
</UL></BLOCKQUOTE>
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