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From Nathan Bubna <nbu...@gmail.com>
Subject Re: More 1.7 BC issues (porting from 1.5)
Date Thu, 03 May 2012 19:20:25 GMT
Ah, it was Sergiu, not Byron.  Here's the relevant discussion:

https://issues.apache.org/jira/browse/VELOCITY-681

On Thu, May 3, 2012 at 12:16 PM, Nathan Bubna <nbubna@gmail.com> wrote:
> Ok, for my sanity, is this an accurate rewrite?
>
> #macro( inner $arg )
>  #set($ref = '')$arg
> #end
> #macro( outer )
>  #foreach( $ref in ['foo','bar','yok','dar'] )
>    #inner( $ref )
>  #end
> #end
> #outer()
>
> Do you get the same behavior in both with this?
>
> #macro( inner $arg )
>  #set($ref = '')$arg
> #end
> #foreach( $ref in ['foo','bar','yok','dar'] )
>  #inner( $ref )
> #end
>
> Or is it only when the macros are nested?
> Also, do you have localscope on for the macros?
>
> I know changes were made in the pass-by-name behavior between 1.5 and
> the trunk (2.0-SNAPSHOT), but my memory is failing as to the
> chronology of them.  What i do recall (possibly incorrectly), makes me
> think this should have been reversed; blank in the older version,
> instead of the newer.  I thought we stopped proxying #set calls on
> macro args, because while that was arguably a correct way to do
> pass-by-name, it was deemed surprising and not worth the
> implementation/performance costs.  I seem to recall arguing with
> someone about this, maybe Byron?  Well, i'm confused.   I also haven't
> the time to fire up Velocity environment right now on this machine to
> test it.  Perhaps someone else can step in.
>
> On Thu, May 3, 2012 at 11:51 AM, Boris Partensky
> <boris.partensky@gmail.com> wrote:
>> Not seeing any errors in log. Corrected to 2 single quotes. Same
>> behavior. I was hoping that $input in each iteration will not be empty
>> string, but rather 'foo', 'bar' etc (that's the way 1.5 behaves). Why
>> would setting a value of $type in parent (foreach) scope would affect
>> the value of the local $input argument?
>>
>> String template = "#set($global_types=['foo', 'bar', 'yok',
>> 'dar'])#macro( showBox $input)#set($type = '')$input#end"+
>>                "#macro(showBoxes $types)#foreach($type in
>> $types)#showBox($type)#end#end#showBoxes($global_types)";
>>
>>
>> On Thu, May 3, 2012 at 2:33 PM, Nathan Bubna <nbubna@gmail.com> wrote:
>>> Anything in the log?  #set($type = \"\") is not valid syntax, i think.
>>>  I'm not even sure what value you want $type to have.  Two double
>>> quotes or an empty string?
>>>
>>> On Thu, May 3, 2012 at 11:17 AM, Boris Partensky
>>> <boris.partensky@gmail.com> wrote:
>>>> Hi, I have this use case which involves 2 nested macros and a foreach.
>>>> I am trying to understand why this template evaluates to empty string
>>>> on 1.7, and to "foobaryokdar" - on 1.5.
>>>>
>>>>
>>>> String template = "#set($global_types=['foo', 'bar', 'yok',
>>>> 'dar'])#macro( showBox $input)#set($type = \"\")$input#end"+
>>>>                "#macro(showBoxes $types)#foreach($type in
>>>> $types)#showBox($type)#end#end#showBoxes($global_types)";
>>>>
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