testing presence of ML feature

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testing presence of ML feature

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Juergen
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Post: #1

RE: testing presence of ML feature

mikshaw Wrote:

Yes, that's exactly the result I was originally thinking of, but wasn't sure where to start. Thanks. =o)
I'm definitely saving this for future tests, and putting it in with the rest of the code snippets.

I don't really understand the syntax of "do...end" though. Is that just to keep the variables local?

The do and end delimits a block. Inside you have your own scope. It is basically the same as { } in C, where you can also define new variables.

I used the do .. end only because I wanted to declare the variables local, since it doesn't make sense to have them as globals. Lua doesn't allow you to have local variables in the outermost scope:

Code:

> local a=6

> print(a)

nil

which also doesn't make sense.

Of course it would make sense to put it into a function.

Code:

function minimal_version(min_version)

  local version=0; for x in string.gmatch(murgaLua and murgaLua.version or "0","%d+") do version=version*100+tonumber(x) end

  local min_vers=0; for x in string.gmatch(min_version,"%d+") do min_vers=min_vers*100+tonumber(x) end

  if version<min_vers then print"You must use a murgaLua version > 0.5.5" os.exit(1) end

end

minimal_version("0.5.5")

Juergen

02-07-2008 09:07 AM