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https://issues.apache.org/jira/browse/VELOCITY-680?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12674753#action_12674753
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Claude Brisson commented on VELOCITY-680:
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> Basically, i don't want more directives for #setlocal and #setglobal support.
> To my eyes, it's inflexible, non-extensible clutter, especially if we keep
> around config options like velocimacro.context.localscope to complicate the
> possibilities.
I agree - if we find a nice way of specifying the context in #set, it's better
than multiplying the number of directives.
But why not just specify the scope as a second optional argument to #set, as in
:
#set( $foo = $bar, parse )
Visually complex syntaxes can really scare people coming from the world of the
web design - brackets followed by parenthesis are really confusing.
> Depending on the implementation, this syntax might be extensible and allow
> VelocityView contexts to recognize and handle things like:
> #set[request]( $foo = 'bar' )
> #set[session]( $foo = 'bar' )
> #set[application]( $foo = 'bar' )
Those ones already have a very natural syntax (which I didn't include in the
trunk to avoid having the tools depending on a too recent version of the engine
- but, by the way, it's enough not to configure its use by default, so I'll
include it!):
#set($request.foo = 'bar')
#set($session.foo = 'bar' )
#set($application.foo = 'bar' )
Since $request, $session and $application all are legitimate objects, I don't
think we need something else.
Ah. Speaking of this, I think of another solution about the scoped syntax
debate, which in fact is the one I like the most now that I think of it: the
tools approach.
Why not give each scope an object representing it, that is a $foreach, a
$template and a $macro? It looks like really very customizable (as users can
inherit hose objects) and flexible. That would give things like:
#foreach($i in $collection)
#set($foreach.foo = 'bar')
#if($i == 'I want to break out') $foreach.break() #end
#if( $i == 'red alert' ) $template.stop()
#end
#macro(mymacro) #set($mymacro.mylocal = 'bar') #end
etc...
> RFC: New #local directive that behaves like #set but puts things into local
> context in macro rendering
> ------------------------------------------------------------------------------------------------------
>
> Key: VELOCITY-680
> URL: https://issues.apache.org/jira/browse/VELOCITY-680
> 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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