Module: DeepClone

Defined in:
lib/configatron/deep_clone.rb

Instance Method Summary collapse

Instance Method Details

#deep_clone(obj = self, cloned = {}) ⇒ Object

DeepClone

Version

1.2006.05.23 (change of the first number means Big Change)

Description

Adds deep_clone method to an object which produces deep copy of it. It means
if you clone a Hash, every nested items and their nested items will be cloned.
Moreover deep_clone checks if the object is already cloned to prevent endless recursion.

Usage

(see examples directory under the ruby gems root directory)

 require 'rubygems'
 require 'deep_clone'

 include DeepClone

 obj = []
 a = [ true, false, obj ]
 b = a.deep_clone
 obj.push( 'foo' )
 p obj   # >> [ 'foo' ]
 p b[2]  # >> []

Source

simplypowerful.1984.cz/goodlibs/1.2006.05.23

Author

jan molic (/mig/at_sign/1984/dot/cz/)

Licence

You can redistribute it and/or modify it under the same terms of Ruby's license;
either the dual license version in 2003, or any later version.



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# File 'lib/configatron/deep_clone.rb', line 38

def deep_clone( obj=self, cloned={} )
  if cloned.has_key?( obj.object_id )
    return cloned[obj.object_id]
  else
    begin
      cl = obj.clone
    rescue Exception
      # unclonnable (TrueClass, Fixnum, ...)
      cloned[obj.object_id] = obj
      return obj
    else
      cloned[obj.object_id] = cl
      cloned[cl.object_id] = cl
      if cl.is_a?( Hash )
        cl.clone.each { |k,v|
          cl[k] = deep_clone( v, cloned )
        }
      elsif cl.is_a?( Array )
        cl.collect! { |v|
          deep_clone( v, cloned )
        }
      end
      cl.instance_variables.each do |var|
        v = cl.instance_eval( var.to_s )
        v_cl = deep_clone( v, cloned )
        cl.instance_eval( "#{var} = v_cl" )
      end
      return cl
    end
  end
end