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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