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From "Nathan Bubna (JIRA)" <>
Subject [jira] Commented: (VELOCITY-680) RFC: New #local directive that behaves like #set but puts things into local context in macro rendering
Date Wed, 18 Feb 2009 19:56:02 GMT


Nathan Bubna commented on VELOCITY-680:

Well, i certainly don't want to scare people with the brackets.  :)   But forget that, Claude,
i find your object idea very inspiring!   These "control" objects would be simple, explicit,
extensible and a possible solution to a lot of these problems.  They also aren't especially
likely to conflict with existing references (except $template, gotta think about that one).
  New functionality without any need for parser changes.   At first glance, i really like
the idea.   Allow me to open yet another JIRA issue to capture the idea...

> RFC: New #local directive that behaves like #set but puts things into local context in
macro rendering
> ------------------------------------------------------------------------------------------------------
>                 Key: VELOCITY-680
>                 URL:
>             Project: Velocity
>          Issue Type: New Feature
>    Affects Versions: 1.7
>            Reporter: Jarkko Viinamäki
>         Attachments: velocity-local-directive-1.1.patch, velocity-local-directive.patch
> It would be very useful to be able to set variables that are in local macro scope. That
is, they do not overwrite "global" variables and are thrown away after macro rendering. This
would allow people to build macro libraries that do not clash so easily with each other.
> There is some implementation of a "LocalDirective" in experimental/localdirective but
I didn't quite get it and it doesn't follow the same syntax as #set. I used a few minutes
to hack together this alternative implementation which behaves exactly like #set but it puts
things in local context only.
> There's only one test case since this is Request-for-Comments type of patch.

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