From: Charles Oliver Nutter <charles.nutter@...>
Date: 2008-12-03T02:54:27+09:00
Subject: [ruby-core:20216] Re: Proposal: deferred blocks

Yehuda Katz wrote:
> Example:
> 
> Article.select(defer {|a| a.title =~ /Some title/ })
> 
> class Article
>   def self.select(sexp)
>     # sexp is: s(:defer, s(:lasgn, :a), s(:match3, s(:lit, /Some 
> title/), s(:call, s(:lvar, :a), :title, s(:arglist))))
>   end
> end
> 
> I understand that this would require a more explicit definition of the 
> parse tree, but it seems like UnifiedRuby has provided a viable starting 
> point for that work.

It would have to be a keyword to be portable, since e.g. 1.9 and JRuby 
will have different (or no) ASTs to present. But I like the idea of an 
expression tree trigger keyword in principal (similar to how LINQ uses 
"from" as its trigger, I believe).

- Charlie