Julio Maia writes:

I'm trying to create a tag to evaluate the expression passed to it, adding in the expression eval namespace a variable that contains the result of dtml processing of the tag's block. For instance, the following construct:

<dtml-bvar "foo(a=1)" var="block"> some text <dtml-var "1+2"> </dtml-bvar>

would invoke the expression "foo(a=1)" with a variable named 'block' set to 'some text 3' in the expression's namespace (btw, is it possible to achieve this using regular dtml?). What a construction! I do not like it.

However, I couldn't find a way to set a variable in the namespace used in the evaluation of the expression. I've tried to insert an entry in the mappings passed to the expression eval() method as follows: Push a new mapping onto the namespace (with its "push" method). Do not forget, to pop it after your tag.

Dieter