From: "Mauricio Fernández" <batsman.geo@...>
Date: 2004-08-06T01:56:47+09:00
Subject: Re: Macros in Ruby

On Fri, Aug 06, 2004 at 01:38:08AM +0900, Sean O'Dell wrote:
> module ModOne
>   @var = "one"
> 
>   TestProc = Proc.new do
>     @var
>   end
> end
> 
> module ModTwo
>   @var = "two"
> 
>   ModOne::TestProc.call  #=> "two"
> end

In this particular case, it can be solved with 

batsman@tux-chan:/tmp$ cat hfdh.rb
module ModOne
    @var = "one"

    TestProc = Proc.new do
        @var
    end
end

module ModTwo
    @var = "two"

    p instance_eval(&ModOne::TestProc)  #=> "two"
end

batsman@tux-chan:/tmp$ ruby hfdh.rb
"two"

> ...perhaps making a new class named "Macro" which is essentially Proc, but 
> which executes in the current binding instead of the binding where it was 
> created.

I do agree on the fact that better control of the bindings (as often
proposed in the past) would make several of the things people would want
to do with macros possible without further language modifications.



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