• 9
• 10
• 9
• 10
• 10

[LUA] create a function, then assign it to a variable

This topic is 2088 days old which is more than the 365 day threshold we allow for new replies. Please post a new topic.

Recommended Posts

Hi
I am a Lua beginner, and I have a problem.
I want to let my users (designers) create some Lua functions, but I want to keep track of the function they create

So for example, I dont want them to give me this:

"function SayHello() print('hello') end"

I want them to give me these
- name: SayHello
- body: function () print('hello') end

And do along the lines like

lua_setglobal(L, name);

But this won't work because the function's body does not compile on its own.

Is there another way for me to do that, besides manually formatting the script like

sprintf(buffer, "%s =%s", name, body)

Share on other sites
SayHello = function() print('hello') end

But this is more or less semantically identical to:

function SayHello() print('hello') end

It might be worth getting to know Lua a bit better before deciding on just how you're going to expose a scripting interface, as you might miss a few tricks... Edited by e?dd

Share on other sites
I did know that, I think I just didn't explain myself well.

Anyway I found this: http://stackoverflow...ion-in-lua?rq=1

It turns out that returning the function chunk does the trick.

My data therefore is like this

• body = "return function (msg) print(msg) end"
• name = "print_message"

And my (pseudocode) is like this

 void CreateFunc(char* name, char* body) { // verify if the function already exists assert(!funcs.contains(name)); luaL_loadstring(L, body); lua_pcall( L, 0, 1, 0 ); lua_setglobal(L, name); funcs.insert(name) } 

I'm open to other suggestion or remarks of course