orange-cloudfoundry/cf-ops-automation

# Copyright (c) 2005-2022 David Heinemeier Hansson
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
#                                  distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

# frozen_string_literal: true


# From https://github.com/rails/rails/blob/main/activesupport/lib/active_support/core_ext/object/duplicable.rb
class Object
  # Can you safely dup this object?
  #
  # False for method objects;
  # true otherwise.
  def duplicable?
    true
  end
end

class Method
  # Methods are not duplicable:
  #
  #  method(:puts).duplicable? # => false
  #  method(:puts).dup         # => TypeError: allocator undefined for Method
  def duplicable?
    false
  end
end

class UnboundMethod
  # Unbound methods are not duplicable:
  #
  #  method(:puts).unbind.duplicable? # => false
  #  method(:puts).unbind.dup         # => TypeError: allocator undefined for UnboundMethod
  def duplicable?
    false
  end
end



class Object
  # Returns a deep copy of object if it's duplicable. If it's
  # not duplicable, returns +self+.
  #
  #   object = Object.new
  #   dup    = object.deep_dup
  #   dup.instance_variable_set(:@a, 1)
  #
  #   object.instance_variable_defined?(:@a) # => false
  #   dup.instance_variable_defined?(:@a)    # => true
  def deep_dup
    duplicable? ? dup : self
  end
end

class Array
  # Returns a deep copy of array.
  #
  #   array = [1, [2, 3]]
  #   dup   = array.deep_dup
  #   dup[1][2] = 4
  #
  #   array[1][2] # => nil
  #   dup[1][2]   # => 4
  def deep_dup
    map(&:deep_dup)
  end
end

class Hash
  # Returns a deep copy of hash.
  #
  #   hash = { a: { b: 'b' } }
  #   dup  = hash.deep_dup
  #   dup[:a][:c] = 'c'
  #
  #   hash[:a][:c] # => nil
  #   dup[:a][:c]  # => "c"
  def deep_dup
    hash = dup
    each_pair do |key, value|
      if ::String === key || ::Symbol === key
        hash[key] = value.deep_dup
      else
        hash.delete(key)
        hash[key.deep_dup] = value.deep_dup
      end
    end
    hash
  end
end


# From https://github.com/rails/rails/blob/main/activesupport/lib/active_support/core_ext/object/deep_dup.rb
class Object
  # Returns a deep copy of object if it's duplicable. If it's
  # not duplicable, returns +self+.
  #
  #   object = Object.new
  #   dup    = object.deep_dup
  #   dup.instance_variable_set(:@a, 1)
  #
  #   object.instance_variable_defined?(:@a) # => false
  #   dup.instance_variable_defined?(:@a)    # => true
  def deep_dup
    duplicable? ? dup : self
  end
end

class Array
  # Returns a deep copy of array.
  #
  #   array = [1, [2, 3]]
  #   dup   = array.deep_dup
  #   dup[1][2] = 4
  #
  #   array[1][2] # => nil
  #   dup[1][2]   # => 4
  def deep_dup
    map(&:deep_dup)
  end
end

class Hash
  # Returns a deep copy of hash.
  #
  #   hash = { a: { b: 'b' } }
  #   dup  = hash.deep_dup
  #   dup[:a][:c] = 'c'
  #
  #   hash[:a][:c] # => nil
  #   dup[:a][:c]  # => "c"
  def deep_dup
    hash = dup
    each_pair do |key, value|
      if ::String === key || ::Symbol === key
        hash[key] = value.deep_dup
      else
        hash.delete(key)
        hash[key.deep_dup] = value.deep_dup
      end
    end
    hash
  end
end