From: Brian Candler <B.Candler@...>
Date: 2003-02-20T06:19:29+09:00
Subject: Re: Sourcing files

On Thu, Feb 20, 2003 at 01:59:02AM +0900, Mauricio Fern?ndez wrote:
> Using instance_eval is a good idea IMHO:
> 
> batsman@tux-chan:/tmp$ expand -t 2 h.rb
> class Config
>   attr_accessor :x, :y, :z
> end
> 
> USEFILE = false
> 
> conf = Config.new
> conftext = case USEFILE
> when true
>   File.open("./config.rb") { |f| f.read }
> when false
>   'self.x = 1; self.y = 2; self.z = "test" '
> end
> conf.instance_eval conftext
> conf.instance_variables.each do |f|
>   puts "#{f} => #{conf.instance_eval(f).inspect} "
> end
> batsman@tux-chan:/tmp$ ruby h.rb
> @z => "test"
> @y => 2
> @x => 1

That's tidier. The config file can say '@x=1' instead of 'self.x=1' which is
cleaner too.

I guess it's an example of an application which would be cleaner without the
local variable / method dichotomy; ATM there's no way to invoke an attribute
writer without prefixing it with the object reference.

B.