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➜ MUSHclient
➜ Lua
➜ Trying to convert nil to 0 with this command
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Trying to convert nil to 0 with this command
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It is now over 60 days since the last post. This thread is closed.
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| Posted by
| Wingard
(6 posts) Bio
|
| Date
| Sat 25 Apr 2009 11:56 PM (UTC) |
| Message
| I have the following function, and a variable called "momentum", which will always be captured as a string but needs to be converted to an integer. However, momentum is also sometimes nil, which does not work here.
function stringconv(t, name)
local v = GetVariable(name)
local n = tonumber (v)
if n and tostring (n) == v then
return n
else
return v
end
end
Any idea how I can fix this? | | Top |
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| Posted by
| Nick Gammon
Australia (23,133 posts) Bio
Forum Administrator |
| Date
| Reply #1 on Sun 26 Apr 2009 03:21 AM (UTC) |
| Message
| Make it:
local v = GetVariable(name) or 0
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- Nick Gammon
www.gammon.com.au, www.mushclient.com | | Top |
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| Posted by
| Wingard
(6 posts) Bio
|
| Date
| Reply #2 on Sun 26 Apr 2009 06:45 AM (UTC) |
| Message
| Incredibly enough nick, that didn't work.
[string "Script file"]:16: bad argument #1 to 'GetVariable' (string expected, got nil)
stack traceback:
[C]: in function 'GetVariable'
[string "Script file"]:16: in function 'stringconv'
[string "Script file"]:28: in function 'katah'
[string "Alias: "]:1: in main chunk
I still get that error when running the function.
Here's exactly what's going on:
I have a function called katah, it relies on the "momentum" var to do several different attacks when it's called, depending on what my momentum currently is. I have stringconv, which you already know about.
Momentum is always captured as a string from my prompt, but when I have 0 momentum, there's nothing to capture, so it becomes Nil. When the katah function runs, the first thing it does is var.momentum = stringconv(momentum), to properly set momentum to an integer. | | Top |
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| Posted by
| David Haley
USA (3,881 posts) Bio
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| Date
| Reply #3 on Sun 26 Apr 2009 06:33 PM (UTC) |
| Message
| There's a difference between MUSHclient variables (which you access using Get/SetVariable) and Lua variables (which are written "as-is"). In the function you first posted, "name" is a Lua-space variable, but you are trying to look up the MUSHclient variable specified by that name.
What you probably want is something like this, assuming that this really is a Lua-space variable:
function stringconv(str)
return tonumber(str or 0)
end
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David Haley aka Ksilyan
Head Programmer,
Legends of the Darkstone
http://david.the-haleys.org | | Top |
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