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about calling function

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Posted by Sylnbb   (4 posts)  [Biography] bio
Date Thu 03 Dec 2009 07:21 PM (UTC)
Message
for example,

require "wait"
require "check"

the function 'time' in the wait.lua is called whith 'wait.time()' in lua script.
but
the function 'check' in the check.lua is called with
'check()' in lua script.

why do the two functions be called in different way?

I am new to lua and mc,
Help would be appreciated. Thanks!
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Posted by WillFa   USA  (525 posts)  [Biography] bio
Date Reply #1 on Thu 03 Dec 2009 08:26 PM (UTC)
Message
wait is a module. It has subcomponents to it that are stored in a table. There's wait.make, wait.time, etc. Look up "module" in the Programming in Lua book (http://www.lua.org/PiL)

check is just a snippet of code that defines a function. The function gets returned to the Global namespace (_G). You don't need to use require to get it to work. dofile() would work just as well.
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Posted by Twisol   USA  (2,257 posts)  [Biography] bio
Date Reply #2 on Thu 03 Dec 2009 10:15 PM (UTC)
Message
To be fair, there's also no reason you couldn't dofile() a module. require() is just a bulked-up dofile() with a search path, and caching of the return value from each file (generally a table) into package.loaded. module() just happens to set the package.loaded entry itself, so require() notices and says "Oh, nevermind."

(I might be slightly wrong on the mechanics in that last sentence, but I'm fairly certain the rest is right.)

'Soludra' on Achaea

Blog: http://jonathan.com/
GitHub: http://github.com/Twisol
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Posted by Sylnbb   (4 posts)  [Biography] bio
Date Reply #3 on Fri 04 Dec 2009 08:45 PM (UTC)
Message
I've got it,
and thank very much for you both!
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Posted by Nick Gammon   Australia  (21,322 posts)  [Biography] bio   Forum Administrator
Date Reply #4 on Fri 04 Dec 2009 10:13 PM (UTC)
Message
BTW, the "check" function is now built into MUSHclient script space. You don't need to require it at all.

- Nick Gammon

www.gammon.com.au, www.mushclient.com
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