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Setting a variable in the global scope

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Posted by Nick Gammon Australia (23,046 posts) Bio Forum Administrator

Date Reply #15 on Sun 16 May 2010 01:17 AM (UTC)

Message

I got this (in orange):


Run-time error
World: SmaugFUSS
Immediate execution
[string "Command line"]:1: attempt to call global 'imaginaryfunc' (a nil value)
stack traceback:
        [string "Command line"]:1: in main chunk

WillFa said:

So my thought was to use a pcall(TablewithCallmeta(arg)) which should pass your check, since pcall is a function.

The issue isn't whether or not it is a function, but whether it is a function at global scope. For example, hotspot callback functions need to be found at global scope (in Lua) so they can't be local functions (and I imagine a similar thing applies to Python).

What you may be able to do is make a stub function in global scope which calls the function you really want called. In fact, in Lua since you can assign functions as they are first-class values, there is no reason the function that is detected by MUSHclient (eg. when loading a trigger) has to be the same one later on. In Lua's case they are simply called by name later on, in the case of the WSH they are called by dispatch ID (the ID being the thing that is checked for as described above).

So depending on the internals of the script engine, if you can make it resolve a dispatch ID to be something else later, the function it calls might vary. Or, just use a stub function.

- Nick Gammon

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

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