From: Koos Brandt <brandtjc@...>
Date: 2007-10-19T23:16:18+09:00
Subject: Eval alternative to execute string

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.
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