wc3 reforged & lua

[Troll-Brain]

Hi everybody.

I'm curious about the ability to use lua instead of jass.
For example does it provide associative dynamic arrays as lua tables , can we call C functions,
is there a garbage collector, and so one.

Or it's only about the lua syntax ?

 

[pr114]

A map in lua mode runs on a lua VM with all expected functionality of lua 5.3.
For instance, it is not needed to declare variables, functions can be dynamically called, and metatable functionality can be used.

A known difference from standard lua is that since a recent patch, the GC functions can no longer be accessed (it could cause desync).
GC still works, but we cannot do anything to influence it. According to DrSuperGood there is a custom implementation now that handles GC in a synchronous manner.

 

[Troll-Brain]

ok, nice to know ty.

It makes vJass/wurst/cjass/whatever less interesting now i suppose, unless maybe there are projects to make them generating lua code instead of jass ?
So for once lua would be used as a first language generated by an other one.
But well what i'm saying, how many users in the world are interested to that lol
Not to mention backward compatibilities issues.

 

[pr114]

I can't think of any reason to use those as lua does things better.
Perhaps if you want to use existing plug-n-play resources that are made for jass/vjass/etc.

It should be mentioned that because of lua dynamic typing, wrong type inputs for functions no longer get picked up with the syntax checker. Small mistakes cause thread crashes, and debugging is quite painful, especially if you just switched over to lua.

For this reasons, some mappers prefer a Typescript implementation having type safety and syntax check, which will be translated into lua code.
There is a guide on this: cipherxof/wc3-ts-template

 

[Drake53]

Don't wanna derail the thread but I'm getting a bit tired of seeing people subjectively recommending typescript instead of being objective and listing all available options...

 

[Troll-Brain]

Hmm i just bought and downloaded reforged and i feel a bit dumb.
So now jasshelper and japi are included in the official editor.
Well, that's cool but when i try to write lua code in the trigger editor it try to interpret it as jass code.
I didn't find any option to disable jasshelper nor japi.

What do i need to know ?

Or the editor doesn't support it and we must edit the map script directly ?

 

[J2Krauser]

Hmm i just bought and downloaded reforged and i feel a bit dumb.
So now jasshelper and japi are included in the official editor.
Well, that's cool but when i try to write lua code in the trigger editor it try to interpret it as jass code.
I didn't find any option to disable jasshelper nor japi.

What do i need to know ?

Or the editor doesn't support it and we must edit the map script directly ?

Not sure if I'm understanding correctly, but Scenario → Map Options... → Script Language: Lua

 

[Troll-Brain]

ok ty, however the script language field is grey, i can't change it to lua.
I need to setup lua maybe ?
I built it on windows 10 from source but maybe i need more configuration.
I thought it would have been embeded in warcraft 3.

 

[J2Krauser]

ok ty, however the script language field is grey, i can't change it to lua.
I need to setup lua maybe ?
I built it on windows 10 from source but maybe i need more configuration.
I thought it would have been embeded in warcraft 3.

As far as I know, it will only allow you to change that option if the map doesn't yet have scripts in it. As in, if you already have some JASS in there, it'll be greyed out. I just opened up the editor to check on this, actually. In a blank map, I can change it, but in a map where I have scripts, it's greyed out.

 

[Troll-Brain]

ok, it works ty.
I guess coming back after years is ok to start as a newbie heh (or i will pretend it is)

 

[Uncle]

You can disable the scripts as well, just as long as there's no Jass enabled it can be changed to Lua.

Unfortunately, you can't use Jass with Lua, so re-enabling the Jass is rather pointless.

 

[Eikonium]

Unfortunately, you can't use Jass with Lua, so re-enabling the Jass is rather pointless.

I know, old thread, but just to debunk myths:
You can use Jass within lua code by encapsulating the Jass code in //! endusercode and //! beginusercode.

For instance, the following would work in a lua-map:

--Jass code:
//! endusercode
function b takes nothing returns string
    return "Hello World"
end
//! beginusercode

--lua code:
function a()
    print(b())
end

Still I agree that mixing Jass and lua in one map is pointless. You can access Jass code from lua functions, but I don't know a way to do the opposite.