From: Jari Williamsson <jari.williamsson@...>
Date: 2008-02-22T06:48:52+09:00
Subject: Re: Where does instance_eval _magically_ set the variable to?

Strange. The REALLY interesting stuff starts to happen when you 
encapsulate the code in a module. (name becomes the name of the module)


Best regards,

Jari Williamsson


Andrew Chen wrote:
> Todd,
> There are some subtle difference between load and instance_eval.
> In this case, instance_eval works, the load doesn't.
> 
> I still have no idea where the instance_eval put the variables at.
> 
>  >cat param.txt
> name="John"
>  >cat tmpl.txt
> my name is: <%= name %>
>  >cat erb_instance_eval.rb
> #!/usr/bin/env ruby
> 
> require 'erb'
> 
> instance_eval(File.read("param.txt"))
> #load "param.txt"
> puts ERB.new(File.read("tmpl.txt")).result(binding)
>  >./erb_instance_eval.rb
> my name is: John
> 
> 
>  >cat erb_load.rb
> #!/usr/bin/env ruby
> 
> require 'erb'
> 
> #instance_eval(File.read("param.txt"))
> load "param.txt"
> puts ERB.new(File.read("tmpl.txt")).result(binding)
>  >./erb_load.rb
> (erb):1: undefined local variable or method `name' for main:Object
> (NameError)
>         from ./erb_load.rb:7
>  >
> 
> Also, the load_yaml won't work, because I need to setup variables
> dynamically.
> 
> Thanks
> ~Andrew Chen
> 
>