Started again with Rails 4

[feedcatcher.git] / vendor / rails / activesupport / lib / active_support / core_ext / module / delegation.rb

diff --git a/vendor/rails/activesupport/lib/active_support/core_ext/module/delegation.rb b/vendor/rails/activesupport/lib/active_support/core_ext/module/delegation.rb
deleted file mode 100644 (file)
index fb4b5f0..0000000
--- a/vendor/rails/activesupport/lib/active_support/core_ext/module/delegation.rb
+++ /dev/null
@@ -1,121 +0,0 @@
-class Module
-  # Provides a delegate class method to easily expose contained objects' methods
-  # as your own. Pass one or more methods (specified as symbols or strings)
-  # and the name of the target object as the final <tt>:to</tt> option (also a symbol
-  # or string).  At least one method and the <tt>:to</tt> option are required.
-  #
-  # Delegation is particularly useful with Active Record associations:
-  #
-  #   class Greeter < ActiveRecord::Base
-  #     def hello()   "hello"   end
-  #     def goodbye() "goodbye" end
-  #   end
-  #
-  #   class Foo < ActiveRecord::Base
-  #     belongs_to :greeter
-  #     delegate :hello, :to => :greeter
-  #   end
-  #
-  #   Foo.new.hello   # => "hello"
-  #   Foo.new.goodbye # => NoMethodError: undefined method `goodbye' for #<Foo:0x1af30c>
-  #
-  # Multiple delegates to the same target are allowed:
-  #
-  #   class Foo < ActiveRecord::Base
-  #     belongs_to :greeter
-  #     delegate :hello, :goodbye, :to => :greeter
-  #   end
-  #
-  #   Foo.new.goodbye # => "goodbye"
-  #
-  # Methods can be delegated to instance variables, class variables, or constants
-  # by providing them as a symbols:
-  #
-  #   class Foo
-  #     CONSTANT_ARRAY = [0,1,2,3]
-  #     @@class_array  = [4,5,6,7]
-  #     
-  #     def initialize
-  #       @instance_array = [8,9,10,11]
-  #     end
-  #     delegate :sum, :to => :CONSTANT_ARRAY
-  #     delegate :min, :to => :@@class_array
-  #     delegate :max, :to => :@instance_array
-  #   end
-  #
-  #   Foo.new.sum # => 6
-  #   Foo.new.min # => 4
-  #   Foo.new.max # => 11
-  #
-  # Delegates can optionally be prefixed using the <tt>:prefix</tt> option. If the value
-  # is <tt>true</tt>, the delegate methods are prefixed with the name of the object being
-  # delegated to.
-  #
-  #   Person = Struct.new(:name, :address)
-  #
-  #   class Invoice < Struct.new(:client)
-  #     delegate :name, :address, :to => :client, :prefix => true
-  #   end
-  #
-  #   john_doe = Person.new("John Doe", "Vimmersvej 13")
-  #   invoice = Invoice.new(john_doe)
-  #   invoice.client_name    # => "John Doe"
-  #   invoice.client_address # => "Vimmersvej 13"
-  #
-  # It is also possible to supply a custom prefix.
-  #
-  #   class Invoice < Struct.new(:client)
-  #     delegate :name, :address, :to => :client, :prefix => :customer
-  #   end
-  #
-  #   invoice = Invoice.new(john_doe)
-  #   invoice.customer_name    # => "John Doe"
-  #   invoice.customer_address # => "Vimmersvej 13"
-  #
-  # If the object to which you delegate can be nil, you may want to use the
-  # :allow_nil option. In that case, it returns nil instead of raising a
-  # NoMethodError exception:
-  #
-  #  class Foo
-  #    attr_accessor :bar
-  #    def initialize(bar = nil)
-  #      @bar = bar
-  #    end
-  #    delegate :zoo, :to => :bar
-  #  end
-  #
-  #  Foo.new.zoo   # raises NoMethodError exception (you called nil.zoo)
-  #
-  #  class Foo
-  #    attr_accessor :bar
-  #    def initialize(bar = nil)
-  #      @bar = bar
-  #    end
-  #    delegate :zoo, :to => :bar, :allow_nil => true
-  #  end
-  #
-  #  Foo.new.zoo   # returns nil
-  #
-  def delegate(*methods)
-    options = methods.pop
-    unless options.is_a?(Hash) && to = options[:to]
-      raise ArgumentError, "Delegation needs a target. Supply an options hash with a :to key as the last argument (e.g. delegate :hello, :to => :greeter)."
-    end
-
-    if options[:prefix] == true && options[:to].to_s =~ /^[^a-z_]/
-      raise ArgumentError, "Can only automatically set the delegation prefix when delegating to a method."
-    end
-
-    prefix = options[:prefix] && "#{options[:prefix] == true ? to : options[:prefix]}_"
-
-    allow_nil = options[:allow_nil] && "#{to} && "
-
-    methods.each do |method|
-      module_eval(<<-EOS, "(__DELEGATION__)", 1)
-        def #{prefix}#{method}(*args, &block)                           # def customer_name(*args, &block)
-          #{allow_nil}#{to}.__send__(#{method.inspect}, *args, &block)  #   client && client.__send__(:name, *args, &block)
-        end                                                             # end
-      EOS
-    end
-  end
-end