From: goodieboy <goodieBoy@...>
Date: 2008-03-15T02:09:39+09:00
Subject: Re: Help with the DSL (ish) config class

Cool that's exactly what I was looking for! I came up with this simple
little piece:

class Config

  instance_methods.each { |m| undef_method m unless (m =~ /^__/) or
['class', 'instance_eval'].include?(m) }

  def initialize(init_data=nil, &block)
    @d = init_data || {}
    instance_eval(&block) if block_given?
  end

  def to_hash; @d; end

  def method_missing(method, data=nil, &block)
    @d[method] = data
    return @d[method] = self.class.new(data, &block).to_hash if
data.nil?
    @d
  end

end

c = Config.new do
  simple_setting 'the value'
  send 'Testing send'
  nested {
    new 'Testing new, make sure it gets passed to method_missing'
    nested_key 'nested_value'
    deep_nesting {
      deep_nested_key 'deep nested value'
      o 'Test'
      instance_variables 'test'
    }
  }
end

puts c.to_hash.inspect

Thanks for all of your help and suggestions. I learned quite a bit
from this :)

Matt



On Mar 2, 12:27 pm, Drew Olson <olso...@gmail.com> wrote:
> M.W. Mitchell wrote:
> > Hi,
>
> > Thanks Drew. I had something like that working too. But the problem is
> > method_missing. What if I want to create a key that happens to have
> > the same name as a method that actually exists? Also, how would you
> > convert that to a hash?
>
> > Thanks again,
> > Matt
>
> Matt -
>
> That code actually produces a hash, we are just storing it in a file. If
> you wanted to grab the file and use the hash, you would do something
> along the lines of:
>
> my_hash = YAML::load(File.read("my_file.yaml"))
>
> As far as the method_missing issues, this is a typical example of where
> using something like BlankSlate would be helpful. You can read more
> about it here:http://onestepback.org/index.cgi/Tech/Ruby/BlankSlate.rdoc
>
> - Drew
> --
> Posted viahttp://www.ruby-forum.com/.