You are making things really
really difficult which HTML::Template can make simple.
You don't need any of that <CSTM> nonsense, or the filter callback.
Here's a template which does all you want:
<table>
<tmpl_loop name="rows">
<tr
<tmpl_if name="__odd__">
class="odd"
<tmpl_else>
class="even"
</tmpl_if>
>
<td>
<tmpl_var name="data">
</td>
</tr>
</tmpl_loop>
</table>
You put the odd-even logic inside the opening TR tag and HTML::Template does the rest. The source code's going to look a bit weird but the browser doesn't care.
Nobody says perl looks like line-noise any more
kids today don't know what line-noise IS ...
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