[stringtemplate-interest] problem with simple group inheritance

[Chris Pizzi]

Zenaan Harkness wrote:
> On Wed, Jun 18, 2008 at 12:55:13PM -0400, Chris Pizzi wrote:
>> I am having a problem with simple group inheritance in Python
>> stringtemplate 3.1.  It seems that if a template is not found under
>> the sub-group's root directory, it never tries to find it in the
>> super-group's.
>>
>> Given this directory layout:
>>
>> ./super/sup.st ./sub/sub.st
>>
>> with super.st containing:
>>
>> SUPER
>>
>> and sub.st containing:
>>
>> SUB $sup()$
>>
>> I would expect the following to yield "SUB SUPER", however I get an
>>  error instead:
>>
>>>>> from stringtemplate3 import StringTemplateGroup sup =
>>>>> StringTemplateGroup("super","./super") sub =
>>>>> StringTemplateGroup("sub","./sub") sub.superGroup = sup print
>>>>> sub.getInstanceOf("sub")
>> Got IOError writing to writerAutoIndentWriter SUB
>>>>>
>>
>> Am I misunderstanding inheritance, or is this actually a problem?
>> For now I have patched groups.py to make it behave the way I'm
>> expecting:
>
> Are you using group files, or separate template-per-st-file template
> files?

I'm using groups of separate template-per-st files.

>
> My understanding of groups is that they work with group files (bunch
> of templates in a single file), and not with single template files.
>

Inheritance of directory-based groups seems to be supported.  In the
(both Java and Python) documentation under Template and Attribute Lookup
Rules it says:

> If a template t is associated with a group, but was not defined via a
> group file format, lookup a referenced template in the group's
> template table. If not there, look for it on the disk under the
> group's root dir or via the CLASSPATH (it might have appeared
> dynamically on disk). If not found, recursively look at any
> supergroup of the group. If not found at all, record this fact and
> don't look again on the disk until refresh interval.

It's the "recursively look at any supergroup of the group" behavior that
I'm looking for.

-- 
Chris Pizzi
Sr. Programmer
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