Generic Lua question: Inline breaks/returns

[DarkShadow6]

What, in your opinion, is the best way to accomplish inline breaks/returns (i.e. to block only a specific piece of code, and not the rest of the block, essentially a nested elseif)

local foobar = false
if foo == bar then
    - code here -
    foobar = true
end

if not foobar then
    - backup code -
end

repeat
    - code here, with breaks in it -
    - backup code -
until true

I used to use the first method before I came up with the second.
I'm sure both of those are infinitely better as opposed to:

(function()
    - code here, with returns in it -
    - backup code -
end)()

[ralle105]

I guess you could do
[lua]do
--code with break
--backup code
end
--rest of code[/lua]

[Acecool]

It depends; What are you trying to accomplish?

[_Kilburn]

[QUOTE=ralle105;44337767]I guess you could do
[lua]do
--code with break
--backup code
end
--rest of code[/lua][/QUOTE]

This used to work but I think it doesn't work anymore. Last time I tried that, it whined about break not being inside a loop.

You can do it the outrageous way if you feel like being an asshole.

[lua]if condition then
goto nope
end

print("doing something")

::nope::

print("done")[/lua]

It works, give it a try. :v:

[DarkShadow6]

[QUOTE=_Kilburn;44337842]This used to work but I think it doesn't work anymore. Last time I tried that, it whined about break not being inside a loop.[/quote]
This is correct. I was kinda disappointed it didn't work.

[QUOTE=_Kilburn;44337842]You can do it the outrageous way if you feel like being an asshole.

[lua]if condition then
goto nope
end

print("doing something")

::nope::

print("done")[/lua]

It works, give it a try. :v:[/QUOTE]
...Only if using Lua 5.2
Hey, does GM use 5.1 or 5.2?

[Acecool]

Ah, yeah it will complain if there is an un-nested break/continue/return.

On files I don't want to execute I'd do if ( true ) then return; end

If it's conditional, you shouldn't have any issue.

[DarkShadow6]

do return end

Shorter and cleaner.

[editline]24th March 2014[/editline]

Something I've never seen is a multi-else[if].
Sort of like finally I guess except it doesn't always run.
Example:

local stuff = getStuff()
if stuff then
    local stuff2 = stuff:doSomething()
    if stuff2 then
        return stuff2:doSomethingElse()
melse(2)
    print("either didn't have stuff or didn't have stuff2")
end

where melse <depth> is the number of blocks to go up (i.e. melse(1) == else)
I can see it not working out well but fuck would it be useful.

[editline]24th March 2014[/editline]

Just in case it's not clear of my intentions, here's a live snippet of code:

repeat
	if gmp.DynaviewFreelookEnabled:GetBool() then
		if gmp.DynaviewFreelookActive and not gmp.DynaviewFreelookAng then
			gmp.DynaviewFreelookAng = gmp.DynaviewData.angles
		end
		if gmp.DynaviewFreelookEnabled:GetBool() and gmp.DynaviewFreelookActive then
			gmp.DynaviewData.angles = gmp.DynaviewFreelookAng + AngAddCurrent
			break
		end
	end
	gmp.DynaviewData.angles = AngCurrent + AngAddCurrent
until true

[editline]asd[/editline]

Nevermind, bad example, I need to go to bed:

if gmp.DynaviewFreelookEnabled:GetBool() and gmp.DynaviewFreelookActive then
	if not gmp.DynaviewFreelookAng then
		gmp.DynaviewFreelookAng = gmp.DynaviewData.angles
	end
	gmp.DynaviewData.angles = gmp.DynaviewFreelookAng + AngAddCurrent
else
	gmp.DynaviewData.angles = AngCurrent + AngAddCurrent
end

[editline]24th March 2014[/editline]

lua_run ::nope:: goto nope

Well I guess GM uses 5.2...

[editline]24th March 2014[/editline]

THIS IS THE [EDITLINE] OF LEGENDS

[editline]24th March 2014[/editline]

I AM GOING TO SLEEP FUCK

[mcd1992]

I'm not following you completly but I know garry has implemented 'continue' into glua. Would that be of any use?

[DarkShadow6]

[QUOTE=mcd1992;44342903]I'm not following you completly but I know garry has implemented 'continue' into glua. Would that be of any use?[/QUOTE]

> do continue end...

[ERROR] lua_run:1: no loop to continue near 'end'
  1. unknown - lua_run:0

[Acecool]

continue is used in loops to avoid having to wrap the entire insides of a for loop with an if statement.

What exactly are you trying to do? Are you just asking about how we prefer to write it ourselves in terms of coding style?

[Willox]

[QUOTE=DarkShadow6;44337897]This is correct. I was kinda disappointed it didn't work.

...Only if using Lua 5.2
Hey, does GM use 5.1 or 5.2?[/QUOTE]

LuaJIT has labels and gotos, despite sticking to mostly Lua 5.1 standards.

[DarkShadow6]

[QUOTE=Willox;44344386]LuaJIT has labels and gotos, despite sticking to mostly Lua 5.1 standards.[/QUOTE]
Interesting. Didn't know that.