Zugg Software :: View topic

Posted: Sun Sep 16, 2007 12:22 am

I'm trying to figure out how to return a value from CMUD function that executes in Lua script.

To be clear, I've defined a function in CMUD, and specified it's script type to be Lua. It does everything I want but I want to have it return a value to the rest of CMUD like I would any other CMUD funtion. In zScript I know the command is "#RETURN" but I'm not sure what to use in Lua.

I've tried "zs.cmd.return", "return" but neither seems to work.

Anyone got any suggestions? Fang this means you. Smile

Posted: Sun Sep 16, 2007 8:53 am

It seems that the function and return commands haven't been added to Lua - compare print(zs.cmd.function) and print(zs.cmd.return) to print(zs.cmd.additem).

But if you're defining functions that use Lua scripts, why not use a real Lua function?

Posted: Sun Sep 16, 2007 4:52 pm

I am... but what I need is to return that result to cMUD. What I used to do with two CMUD functions coded in zScript, I'm now doing with one CMUD function code in Lua, but I need that return.

As an aside, I need to use a real Lua function to be able to return multiple values without doing anything hoaky.

Guess I'll be waiting on Zugg then. (Zugg if your reading this I hope your and Chiara are enjoying Yellowstone.)

Posted: Mon Sep 24, 2007 8:04 pm

Confirmed but very weird. Lua should have access to *all* commands and functions in zScript. So I'm not sure why zs.return isn't working properly. Anyway, added this to the bug list.

Posted: Fri Sep 28, 2007 7:50 pm

Well, this one was a pain.

Turns out that there seems to be a problem with the Lua parser. Apparently "return" is a reserved word, and even when it is defined as a valid table value, doing something like:

zs.return(123)

will not parse. It always results in a Lua parser error about a expected. If I change "return" to "ret" then I can get it to work. So Lua is treating the string "return" as a special case somehow and is not allowing it with user-objects like "zs".

In the process of fixing this, I decided to just implement it the way that you would expect. That is, you just use the normal Lua "return" function. So, to return a value from a Lua CMUD function, just use "return" in v2.04.

Wizard Joined: 14 Aug 2004 Posts: 1269

Posted: Fri Sep 28, 2007 8:49 pm

Yep, correct. It's just like the body of the CMUD function was the body of a Lua function.

Posted: Sun Sep 30, 2007 4:23 am

This works like a charm now.. .thanks Zugg.