From: Jim Freeze <jim@...>
Date: 2003-09-28T14:05:25+09:00
Subject: Re: Thoughts on yield

On Sunday, 28 September 2003 at  9:30:15 +0900, Nolan J. Darilek wrote:
> 
> clef do
>   measure("4/4") do
>     c d e f g a b c
>     chord do
>       c e g
>     end
>   end
> end
> 
> In this example, a-g are methods returning note objects.
> 
> What I'd like is to have that return a list like so:
> 
> ["c", "d", "e", "f", "g", "a", "b", "c", ["c", "e", "g"]]
> 
> But, as it stands, each expression is evaluated and discarded. I'd
> like to avoid having to include actual lists in the blocks; while
> arbitrary ruby expressions would be possible, I'm aiming to hide much
> of that from the casual user.
> 

At the basic level do you want

  chord { c e g } 
  
to return ["c", "e", "g"]?

It seems that you want to generate a list
using a lisp syntax. And to do that inside
a block, you probably need a hook to catch 
the return value of each statment.
I'm not sure that would be advisable.

Have you considered parsing a string and using eval?
For example, do:

   chord %{ c e g }


Of course, some smarter people than me may provide
the answer you are looking for.

-- 
Jim Freeze
----------
A celebrity is a person who is known for his well-knownness.