Architecture proposal: Downward-matching CSS-like context selectors ("Luke Skywalker Options") - FLUID-4873

[Justin Obara]

Thanks for putting this up Antranig, and I like the name IoCSS. Currently I have issues with IoC when I need to find some relative component, i.e something that is neither an ancestor, descendant, or direct sibling. Would this new system help for those cases too?

As for the syntax below: 

Where does the id come from? Is it the one generated by the framework, or is there a way to set an id on the component?

Just to clarify, when you say "any" do you mean all, or just one of the set of all possible elements matching the criteria?

Thanks
Justin

On 2012-12-19, at 4:55 AM, Antranig Basman <Antranig.Basman at colorado.edu> wrote:

> I've drawn up a JIRA summarising the immediate motivations we might have for such a system (our upcoming UIOptions refactoring work), a potential syntax, and some other use cases for it at
> 
> http://issues.fluidproject.org/browse/FLUID-4873
> 
> As a "potted summary", the proposal is to support this very tiny subset of the CSS selector syntax (almost the same as that supported within the Fluid Renderer system for "cutpoints") for what we might call "IoCSS" selectors which are capable of making downward assertions about the matching of a component or group of components below a component tree root:
> 
> * - matches any component - universal selector
> E - matches any component holding a context name of E - special support for the string "that" as in current IoC context matching
> E#myid - matches any component with a context name of E with id equal to myid
> 
> And the following two descendent rules:
> 
> E F - Matches any F element that is a descendant of an E element.
> E > F - Matches any F element that is a direct child of an E element
> 
> 
> Please supply comments, suggestions, questions, and improvements - if we have some time at today's community meeting we could also discuss this a bit -
> 
> Cheers,
> 
> A
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