From: Erwin Abbott <erwin.abbott@...>
Date: 2007-07-10T13:52:58+09:00
Subject: Re: Syntax sugar: method[](...) => method(...)

Hi Logan,

Really cool stuff going on there, that was worth a thousand words. I
never knew about this UnboundMethod#bind thing, curious if Proc has a
similar mechanism. Also happy to learn Method#[] is an alias to
Method#call

Let me summarize what's going on here to make sure I understand. First
we're creating an UnboundMethod from the given block. Next we create
the named method, which returns a blank object with a [] method that
calls the block. Okay, that was simpler than I thought!

One thing I'll be trying to work out is calling the method "logins"
will return a plain Object instead of a list of @events that are of
the type :login. I think for my purposes defining a few more singleton
methods like obj.each and obj.size would be good enough.

On 7/9/07, Logan Capaldo <logancapaldo@gmail.com> wrote:
> class Module
>   def bracket(name, &code)
>     define_method("#{name}_bracketed", &code)
>     m = instance_method("#{name}_bracketed")
>     remove_method "#{name}_bracketed"
>
>     define_method(name) do ||
>        obj = Object.new
>        m1 = m.bind(self)
>        (class << obj; self; end).module_eval { define_method(:[]) { |x|
> m1[x] } }
>        obj
>    end
>   end
> end
>
>
> class Foo
>    bracket :logins do |date|
>      @data.select { |e| e.date == date }
>   end
> end
>
> Who needs sugar?
>
> (I so didn't test this at all)

Thanks,
- Erwin