[Radiant] Container tag with default values for nested tags

[Casper Fabricius]

Nice one, Sean. Seems obvious now that you've shown the way ;)

Thanks,
Casper

On 03/06/2008, at 20:41, Sean Cribbs wrote:

> 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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