require 'active_support/inflector/methods' module ActiveSupport class Deprecation class DeprecationProxy #:nodoc: def self.new(*args, &block) object = args.first return object unless object super end instance_methods.each { |m| undef_method m unless m =~ /^__|^object_id$/ } # Don't give a deprecation warning on inspect since test/unit and error # logs rely on it for diagnostics. def inspect target.inspect end private def method_missing(called, *args, &block) warn caller, called, args target.__send__(called, *args, &block) end end # This DeprecatedObjectProxy transforms object to depracated object. # # @old_object = DeprecatedObjectProxy.new(Object.new, "Don't use this object anymore!") # @old_object = DeprecatedObjectProxy.new(Object.new, "Don't use this object anymore!", deprecator_instance) # # When someone executes any method except +inspect+ on proxy object this will # trigger +warn+ method on +deprecator_instance+. # # Default deprecator is ActiveSupport::Deprecation class DeprecatedObjectProxy < DeprecationProxy def initialize(object, message, deprecator = ActiveSupport::Deprecation.instance) @object = object @message = message @deprecator = deprecator end private def target @object end def warn(callstack, called, args) @deprecator.warn(@message, callstack) end end # This DeprecatedInstanceVariableProxy transforms instance variable to # depracated instance variable. # # class Example # def initialize(deprecator) # @request = ActiveSupport::Deprecation::DeprecatedInstanceVariableProxy.new(self, :request, :@request, deprecator) # @_request = :a_request # end # # def request # @_request # end # # def old_request # @request # end # end # # When someone execute any method on @request variable this will trigger # +warn+ method on +deprecator_instance+ and will fetch @_request # variable via +request+ method and execute the same method on non-proxy # instance variable. # # Default deprecator is ActiveSupport::Deprecation. class DeprecatedInstanceVariableProxy < DeprecationProxy def initialize(instance, method, var = "@#{method}", deprecator = ActiveSupport::Deprecation.instance) @instance = instance @method = method @var = var @deprecator = deprecator end private def target @instance.__send__(@method) end def warn(callstack, called, args) @deprecator.warn("#{@var} is deprecated! Call #{@method}.#{called} instead of #{@var}.#{called}. Args: #{args.inspect}", callstack) end end # This DeprecatedConstantProxy transforms constant to depracated constant. # # OLD_CONST = ActiveSupport::Deprecation::DeprecatedConstantProxy.new('OLD_CONST', 'NEW_CONST') # OLD_CONST = ActiveSupport::Deprecation::DeprecatedConstantProxy.new('OLD_CONST', 'NEW_CONST', deprecator_instance) # # When someone use old constant this will trigger +warn+ method on # +deprecator_instance+. # # Default deprecator is ActiveSupport::Deprecation. class DeprecatedConstantProxy < DeprecationProxy def initialize(old_const, new_const, deprecator = ActiveSupport::Deprecation.instance) @old_const = old_const @new_const = new_const @deprecator = deprecator end def class target.class end private def target ActiveSupport::Inflector.constantize(@new_const.to_s) end def warn(callstack, called, args) @deprecator.warn("#{@old_const} is deprecated! Use #{@new_const} instead.", callstack) end end end end