How to get the full file path of an arbitrary ruby class?

eg:

class Base

    def self.inherited(subclass)
        puts "New subclass: #{subclass}"
        path_of_subclass = ????
    end
end

Then in another f开发者_StackOverflowile/class, it extends Base.

class X < Base
          ....
end

How would I get the path to the rb file of that subclass from the super class.

Use the caller method and parse it for the filename. inherited is always called from the file that is defining the class.

Consider the following:

a.rb:

require 'pp'
class Base
  def self.inherited(subclass)
    pp caller
  end
end

b.rb:

require './a.rb'

class Derived < Base
end

Let's run this:

$ruby b.rb
["b.rb:3"]

File.expand_path(subclass.to_s)

Edit: Sorry, I just realized the original way would not work if they aren't defined in the same file.