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io language - and Ruby

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Posted by Nick Gammon Australia (23,173 posts) Bio Forum Administrator

Date Reply #15 on Thu 01 Jun 2006 12:53 AM (UTC)

Message

It gets a bit weirder. I thought maybe "test" was some kind of reserved word, so I re-did it using nickgammon as the function name. I guess that isn't a reserved word :P .


def nickgammon()
#  @world.Note "hi there"
end 

nickgammon()  # --> undefined method `nickgammon' for #<Module:0x1b65038>

Well, I just defined it right there! And if my syntax is wrong, how come "test" works? Again, that works in the stand-alone version:


def nickgammon()
print "oops"
end

nickgammon()  # --> "oops"

- Nick Gammon

www.gammon.com.au, www.mushclient.com

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Posted by

Nobody (38 posts) Bio

Date

Reply #16 on Sat 03 Jun 2006 04:21 AM (UTC)

Message

Very weird. Clearly it's working on the engine ok, otherwise @world.note wouldn't work. There must be some issue to do with scoping and function declarations. I've never seen it do anything like this before though.

Yes, test is reserved (well, not reserved, it's defined in the kernel module and is similar to the linux test command for finding out information about files).

Okay, try this. Stuff works ok without defining a function right? To double check this, make a few variables, change them around a bit, and double check that everything works ok. I'm confident it willl, but when I'm debugging stuff like this I always like to go very slowly and very thoroughly.

If that's ok, then try defining a function, like your previously mentioned nicgammon function, but instead of trying to call it from within the script, can you call it from the source code using ParseScriptText() ? I realise it's a kludge, but I'm struggling to figure out why a defined function isn't being found.

Is there any chance you could send me the modified binary (or dll, or whatever) that has ruby working, so I can play around with it myself? (I love to fiddle).

Oh, one thing I just thought of. I think ruby is a bit like C++, in that it tries to find functions that take the correct number of arguments. It's possible that there are arguments being thrown in somehow, and since your function doesn't accept arguments, it says it can't be found.

What about if you defined a few more functions that have 1, 2, 3 and 4 arguments, and then you can figure out which one is being called.

Also, there is some easy ways to get debug information about which functions are available.

if you do something like this in your script:

def ng
@World.note "hi"
end

@world.note("Public methods:\n")
@world.note(public_methods + "\n")
@world.note("Private methods:\n")
@world.note(private_methods + "\n")
@world.note("Protected methods:\n")
@world.note(protected_methods + "\n")

This will print out all methods that are public, private, and protected. You'll probably get alot of them, but you're looking to find the "ng" one. It *should* be in the public methods list (when I tested it using the ruby interpreter, that's where I found it), but if it's not showing up there, that may indicate a problem.

That's all I can think of for now.

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Posted by

Nick Gammon Australia (23,173 posts) Bio Forum Administrator

Date

Reply #17 on Tue 13 Jun 2006 02:27 AM (UTC)

Message

That didn't really work.

Look, it seems to me that the Ruby Active Script interface isn't working, plain and simple.

I have had similar problems in the past with things like PHP and Tcl. The initial implementations weren't perfect, and after they got up to about a year in, it would work, with no effort on my part.

Internally in MUSHclient the only difference between the script interface for (say), VBscript and JScript is simply the string that is supplied to instantiate the script engine. After that it should work. Since 6 script engines already work fine (plus Lua which doesn't use Active Scripting) I think I can say that the MUSHclient script interface is working OK.

- Nick Gammon

www.gammon.com.au, www.mushclient.com

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Posted by

Nobody (38 posts) Bio

Date

Reply #18 on Tue 13 Jun 2006 06:49 AM (UTC)

Message

Anything's possible.

I, however, have ruby installed and have another client that uses the (presumably) same scripting interface, and ruby works just fine for me in that program. I also have perl, vbscript, and java as options for the scripting language of that other program, and they all work fine too.

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