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Re: script object property contamination [reckon I've sussed it
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Re: script object property contamination [reckon I've sussed it


  • Subject: Re: script object property contamination [reckon I've sussed it
  • From: Nigel Garvey <email@hidden>
  • Date: Mon, 11 Feb 2002 13:47:44 +0000

has wrote on Sun, 10 Feb 2002 19:00:15 +0000:

><wild supposition>
>
>I'd guess that [script] object names are
>stored as a hash, and that pointers to the objects themselves are stored in
>a simple indexed table.
[...]
>That means the runtime engine only has to do a quick table lookup and
>follow a pointer to retrieve an object (steps 2 and 3) instead of having to
>do a full name-based lookup (steps 1 thru 3).
>
></wild supposition>

>script scriptOne
> property frank : "Frank"
>
> property handlerStore : {}
>
>end script
>
>
>script scriptTwo
> property bob : "Bob"
>
> on getBob()
> get bob
> end getBob
>
>end script
>
>--TEST 1
>tell scriptTwo to getBob()
>--> "Bob" (as you'd expect)
>
>
>--TEST 2
>set scriptOne's handlerStore to scriptTwo's getBob
>
>tell scriptOne to handlerStore()
>--> "Frank" (note: this is wrong; it should've given an error because there
>isn't a 'bob' in scriptOne)

has's theory is born out by the fact that if you insert a 'property bob :
"Bob"' before frank in scriptOne, "Bob" is what's returned by TEST 2. If
instead you insert bob after frank, "Frank" is returned as above.
Similarly, if you instead insert a property before bob in scriptTwo, so
that bob is now the second property in that script and there's only frank
and handlerStore in scriptOne, the result of running TEST 2 is <<handler
getBob>>.

Whether you'd call this a bug (something unexpected at first glance), or
the natural result of transposing a handler compiled in one script into
another script, is a moot point.

NG
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