Re: Filter reference form question
Re: Filter reference form question
- Subject: Re: Filter reference form question
- From: Christopher Nebel <email@hidden>
- Date: Wed, 17 Dec 2003 11:19:34 -0800
On Dec 17, 2003, at 7:42 AM, Brennan wrote:
I dig the filter reference form, but there's something I'd like to get
clear.
In the filter, the 'left hand side' of each boolean clause has the
scope of the object being filtered, for example (imaginary
terminology)
every foo whose width is 10
... in this case we assume that 'color' is a property of our foo
class, so 'width' is evaluated in the scope of each foo object.
Assuming you meant 'width' and not 'color', yes.
OK, all well and good, but what I would dearly love is to also have the
right hand side of the test to operate in the same scope:
every foo whose width is less than its length
This kind of filter fails - apparently, the thing we are comparing it
with occurs in a different scope, so even if our foo class has a
'length' property, a 'can't get' error occurs. Apparently 'it' refers
to the tell target of the containing object, rather than the one being
filtered.
I'm afraid this is impossible... unless someone can enlighten me.
This does seem to be impossible, but not for the reason you suppose.
AppleScript parses and sends out the request as you desire -- both
"width" and "length" are specified as properties of "the object being
examined".
Unfortunately, no application I've checked handles this correctly: the
Finder simply errors, and Cocoa applications (I tried TextEdit and
Mail) return all elements or none, as if the test were always true or
always false. (AppleScript built-in types don't support "whose" in the
first place, so the problem is moot -- yes, fixing that is on my to-do
list.)
Strictly speaking, this is a bug in the application, though arguably
the system should provide more help than it does. I suggest you file a
bug against any application that doesn't handle this correctly.
--Chris Nebel
AppleScript Engineering
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