Convert string to function or send function

local id,cmd,dist=rednet.receive()
turtle[cmd]()

KaoS, on 18 July 2012 - 10:15 AM said:

Just quick query, can you convert a string to a function so you can end a string over rednet and then execute it as a function? I know you can do this:

local id,cmd,dist=rednet.receive()
turtle[cmd]()

and then if you send the string "forward" it moves forward but this is then limited to anything starting with turtle.

another problem is that while you can assign a function to a variable (eg. local me=turtle.forward and then call me()) you cannot then include that in a table and serialize it as it is trying to combine a function and a string, I know you can convert things with tonumber() and tostring(), can you convert a string to a function?

--In this, the variable "s" is the string function you want to execute

local nForcePrint = 0
local func, e = loadstring( s, "lua" )
local func2, e2 = loadstring( "return "..s, "lua" )
if not func then
  if func2 then
   func = func2
   e = nil
   nForcePrint = 1
  end
else
  if func2 then
   func = func2
  end
end

if func then
		setfenv( func, tEnv )
		local tResults = { pcall( function() return func() end ) }
		if tResults[1] then
		 local n = 1
		 while (tResults[n + 1] ~= nil) or (n <= nForcePrint) do
		  print( tostring( tResults[n + 1] ) )
		  n = n + 1
		 end
		else
		 print( tResults[2] )
		end
	else
	 print( e )
	end

func = loadstring(s)
func()

Pinkishu, on 18 July 2012 - 12:59 PM said:

uhm why not just

func = loadstring(s)
func()

KaoS, on 19 July 2012 - 03:13 PM said:

that way you get its exact location and there is a process in which you can place a disk drive next to the pc, insert one and restart the pc, the disk's startup then rewrites the pc, the turtle then removes the disk drive and the apparatus used to place it and returns to your base, you can then use the pirated pc as another modified gps satellite to extend the reach of your overwriting system or you can use it as a signal disruptor etc

MysticT, on 19 July 2012 - 03:19 PM said:

The only problem is that turtles can't insert disks in the disk drives :P/>/>

KingMachine, on 19 July 2012 - 05:50 PM said:

MysticT, on 19 July 2012 - 03:19 PM said:

The only problem is that turtles can't insert disks in the disk drives :P/>/>

turtle selects obsidian pipe
places it next to disk drive (compared from inventory)
turtle drops disk


OR
turtle places disk drive next to a computer
turtle places obsidian pipe above that
turtle drops floppy in

And yes, obsidian pipes work with disk drives. Just tested it to verify it (it is a storage device after all)

This would of course require that mod. But most computer craft servers are tekkit servers anyways. It's highly likely to have them available. If not, there may be other methods in the future.

KingMachine, on 19 July 2012 - 05:50 PM said:

[…], obsidian pipes […]

function test()
print("Test")
end
local s = "test"
func = loadstring(s)
func()

eval :8: attempt to call nil

local s = "print('Loadsting test')"
func = loadstring(s)
func()

lua_string = read()
local func,errmssg = loadstring(lua_string)
if func then func() else print(errmssg) end

addMenuOption(title,callback)

a=function() addMenuOption(title,callback) end

addMenuOption("sometitle","someCallbackFunction()")

menuCallback[active]

someCallbackFunction()

loadstring(menuCallback[active])()

function test()
print("Test")
end
local s = "test"
func = loadstring(s)
func()

local s = "test"
func = loadstring(s)
func()

local s = "test()"
loadstring(s)()

local s = "test()"
func = loadstring(s)
func()

local function test()
print("Test!")
end

local s = "test()"
loadstring(s)()

string:1: attempt to call nil

local function thetest()
print("Test!")
end

local s = "thetest()"
local func,errmsg = loadstring(s)

if func then func() else print(errmsg) end

string:1: attempt to call nil

>lua
lua>loadstring("print("TEST")")()
TEST
lua>

loadstring("print("TEST")")()

function test() print("TEST") end
loadstring("test()")()

function SomeCallback()
print("Callback")
end

function doAction(callback)
print("Doing some action!")
callback()
print("End of frustration")
end

doAction(SomeCallback)

Doing some action!
Callback
End of frustration