[Incrtcl-develop] [ incrtcl-Bugs-3566940 ] #auto generates namespaced names

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Bugs item #3566940, was opened at 2012-09-12 01:09
Message generated for change (Tracker Item Submitted) made by dkf
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Category: Namespace usage
Group: 4.0*
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Donal K. Fellows (dkf)
Assigned to: Michael McLennan (mmclennan)
Summary: #auto generates namespaced names

Initial Comment:
According to a message by jon...@fa... on comp.lang.tcl:
> I'm learning/experimenting with ITCL with a view to using it for a project. I'm using 8.6, and the version of ITCL that comes bundled with that.

> So, when I use #auto to auto generate an object name I get back something like classA0, classB1 ... which is fine, except it's not the actual name of the object ... later on when I try to use the object from a different context I get an unknown command error: it appears that the name of the object is the name within the local context when the object was created, something like ::classA::classB1.

> I've worked around this by using a proc to generate a global name at each object creation point, but that's a bit cludgy. 

> Is there a way to make the auto name global? Or is there an elegant way to only have the name generation override in one place.

I've looked into it, and I believe that the sprintf() used to generate a name (in the #auto processing in Itcl_HandleClass() in generic/itclClass.c) is not adding a leading namespace qualifier (class names don't start with a ::, so the generated name doesn't, so ItclCreateObject() qualifies with respect to the current namespace). The simplest fix is to adjust the pattern used in the sprintf() to "::%.200s%d" (i.e., add a leading ::) which ensures that objects are always created in the correct namespace. (I'd attach a patch, but it's a trivial alteration and the buffer being written to is definitely large enough...)

The down-side is that the objects will report a fully-qualified name when #auto is used. I don't know if that matters.

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