From: "yermej@..." <yermej@...>
Date: 2007-10-19T23:40:04+09:00
Subject: Re: Eval alternative to execute string

On Oct 19, 9:16 am, Koos Brandt <brand...@telkomsa.net> wrote:
> I have the following stored in a file Example1.rb
> require 'rubygems'
> require 'wx'
> include Wx
> require 'wx_sugar/all'
>
> class ExampleApp < App
>   def on_init
>     frame = Frame.new( nil, :title => "Example1.rb" ).show
>   end
> end
>
> ExampleApp.new.main_loop()
>
> If I run the following snippet, it works
> mycontents = IO.read(File.dirname(__FILE__)+ "/testSources/Example1.rb")
>  eval mycontents
>
> if I however create a class and do the eval from inside the class, I get
> an error that 'include' is not a method of Document.
>
> class Document
>   def initialize()
>       @content = ""            # this is the actual content of the
> document
>   end
>   # eval the text content
>   def run
>     eval @content
>   end
>
>   # load the file from disk and put it into @content
>   def load
>     @content = IO.read(File.dirname(__FILE__)+
> "/testSources/Example1.rb"))
>     puts @content
>   end
>
> end
>
> myProg = Document.new()
> myProg.load
> myProg.run
>
> If I however include in the class file the requires and includes, and
> comment them out in Example1.rb, then it also works.
>
> require 'rubygems'
> require 'wx'
> include Wx
> require 'wx_sugar/all'
>
> The story about eval I take note of, but I think it is clear what I want
> to to here: read a file and execute it. From what I see above, this is
> not entirely what eval will do for me. Eval makes the source file part
> of the current executing environment.
>
> What I actually want to do is: ruby "big piece of text" and that should
> not be part of my current environment if you understand what I mean.
> --
> Posted viahttp://www.ruby-forum.com/.

Does it have to be a string? Since you don't want it to be part of
your current environment, wouldn't something like this work just as
well:

`ruby testSources/Example1.rb`