string.expand(s)

[Mock]

I'm reading some contents about lua and strings and i saw an something intersting :blink:
Its about join vars and strings (concantion)

name = "Mock"
kind = "Bear"
print('Hello my name is '..name..' and i am a '..kind..'.')

It will print:
Hello my name is Mock and i am a Bear'.
Allright evebody know this. But has another kind to concanete vars, using string.format

name = "Mock"
kind = "Bear"
print(string.format('Hello my name is %s and i am a %s.',name,kind))

Hello my name is Mock and i am a Bear'.
Same thing...

function printf(...)
return print(string.format(...))
end
--- Its an emulation to printf in c by lua.org

Now with this function string.expand you can join vars most easy to an string, and you can concanate an nil, or boolena or function, but function will appear like this: function: 00474F18
ITS verry easy, look:

name = "Mock"
kind = "Bear"
print(string.expand('Hello my name is $name and i am a $kind.',name,kind))

And of ocurse this will print:
Hello my name is Mock and i am a Bear'.
Now lets install it, go to functions.lua ad add this code

function string.expand(s)
    s = string.gsub(s, "$(%w+)", function (n)
        return tostring(_G[n])
        end)
    return s
end

And have fun!
ps: This dont work if you use local vars.

Using it on my lua irc bot.

[22:44:53] <@Mock> !lua nome = "Mock" animal = "Urso" quer = "Comer" comida = "Salmao" printd(string.expand('Ola eu sou o $nome eu sou um $animal. Eu to afim de $quer um $comida .'))
[22:44:53] <+Bearbot> Lua print: Ola eu sou o Mock eu sou um Urso. Eu to afim de Comer um Salmao .

Function by lua.org

 

[DarkstaR]

Thats pretty sick. I knew about this stuff for c++/VB/C# and shit, didnt know LUA had it as well!

__________________

​

 

[StreamSide]

omfgossh! always you xddd
good code as always :B

 

[Shawak]

This very helpfull, thanks and rep++.

 

[Colandus]

Except he didn't say he didn't make it

From Lua website:

function expand (s)
      s = string.gsub(s, "$(%w+)", function (n)
            return _G[n]
          end)
      return s
    end

Thanks

 

[Mock]

Except he didn't say he didn't make it

From Lua website:

function expand (s)
      s = string.gsub(s, "$(%w+)", function (n)
            return _G[n]
          end)
      return s
    end

Thanks

in any moment i said:
By mock?
._.

 

[Colandus]

No, but you should state it's not made by you.

 

[chojrak]

Lol, Mock... You are bear and you know how to use PC, write on keyboard, write a scripts? :OOOOOOOOOOOOOOO

 

[Mock]

@colandus

I'm reading some contents about lua and strings and i saw an something intersting

i just bring this function to otserv comunnity, but 1/20 scripters read lua reference manual.

 

[Colandus]

Yeah indeed It's OK just wanted to point it out

 

[Mock]

Yes like your function string.trim

 

[Nostradamus]

Real usage for that? To me it is a simple showoff of how to do a C printf version in Lua.
By the way, the is a real no-usage for that: calling regular expressions without due to lazy concadenation rules. Your CPU usage thanks.

 

[XRobin]

Nice ^^ Rep++

 

[Eventide]

look like php... =O
it isn't usefull, but a lot of people like this kind of thing, i guess