[Radiant] Container tag with default values for nested tags

[Sean Cribbs]

Well, the natural answer to deferment in Ruby is a closure, of course!

hash[:normal] ||= lambda { parse('<li><r:link /></li>') }

Sean

Casper Fabricius wrote:
> Sean,
>
> Thanks for your answer. However, parse doesn't work quite as I hoped. 
> Calling parse will parse the given string immediately in the current 
> context and return a string. I need to postpone the actual parsing 
> until the context is changed to each item in the collection. I was 
> hoping to be able to construct some kind of proxy-object that would 
> respond to #call just like when nested templates has been given.
>
> I can easily solve this by just inserting the default value unparsed, 
> and then have a helper method that checks if the value is a string to 
> parsed or a method to be invoked, but I find that solution quite ugly. 
> I'm obsessing about it, because I'd like to contribute the tag to the 
> Radiant core, so I want it to coded right.
>
> Thanks,
> Casper
>
>
> On 01/06/2008, at 16:51, Sean Cribbs wrote:
>
>> Casper,
>>
>> Call parse, passing the text you want to parse:
>>
>> hash[:normal] ||= parse('<li><r:link /></li>')
>>
>> Sean
>>
>> Casper Fabricius wrote:
>>> I'm developing a tag inspired by the way <r:navigation /> works; by 
>>> using nested tags to let the user specify how he wants to render a 
>>> given collection.
>>>
>>> The user could write:
>>> <r:collection_tag>
>>>    <r:normal><b><r:link></b></r:normal>
>>> </r:collection_tag>
>>>
>>> - and the tag uses this nested tag by doing:
>>>    hash = tag.locals.collection_tag = {}
>>>    tag.expand
>>>
>>> - and then later:
>>>    hash[:normal].call
>>>
>>> - to render the contents of the nested tag.
>>>
>>> However, I want the user to also be able to write just:
>>> <r:collection_tag />
>>>
>>> - and the tag will populate hash[:normal] with a default value of, 
>>> say, <r:link />.
>>>
>>> However, I don't know how to create a default value for a nested 
>>> tag, least not when it contains other Radius tags that need to be 
>>> parsed in the context of each iteration of the collection.
>>>
>>> I have tried assigning default values with code such as:
>>>    hash[:normal]   ||= '<li><r:link /></li>'
>>>
>>> - or:
>>>    hash[:normal]   ||= Proc.new {'<li><r:link /></li>'}
>>>
>>> - but the first is just a string, and does not respond to the #call 
>>> method, and the second is just a proc, and do not in fact render 
>>> <r:link /> in the context, it just returns the string unparsed.
>>>
>>> I know of several examples on using default values for tag 
>>> attributes, but not for nested tags. Any hints, ideas, examples?
>>>
>>> Cheers,
>>> Casper Fabricius
>>> http://casperfabricius.com
>>>
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>>
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