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_locations, called, args target.__send__(called, *args, &block) end end # DeprecatedObjectProxy transforms an object into a deprecated one. It # takes an object, a deprecation message and optionally a deprecator. The # deprecator defaults to +ActiveSupport::Deprecator+ if none is specified. # # deprecated_object = ActiveSupport::Deprecation::DeprecatedObjectProxy.new(Object.new, "This object is now deprecated") # # => # # # deprecated_object.to_s # DEPRECATION WARNING: This object is now deprecated. # (Backtrace) # # => "#" 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 # DeprecatedInstanceVariableProxy transforms an instance variable into a # deprecated one. It takes an instance of a class, a method on that class # and an instance variable. It optionally takes a deprecator as the last # argument. The deprecator defaults to +ActiveSupport::Deprecator+ if none # is specified. # # class Example # def initialize # @request = ActiveSupport::Deprecation::DeprecatedInstanceVariableProxy.new(self, :request, :@request) # @_request = :special_request # end # # def request # @_request # end # # def old_request # @request # end # end # # example = Example.new # # => # # # example.old_request.to_s # # => DEPRECATION WARNING: @request is deprecated! Call request.to_s instead of # @request.to_s # (Bactrace information…) # "special_request" # # example.request.to_s # # => "special_request" 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 # DeprecatedConstantProxy transforms a constant into a deprecated one. It # takes the names of an old (deprecated) constant and of a new constant # (both in string form) and optionally a deprecator. The deprecator defaults # to +ActiveSupport::Deprecator+ if none is specified. The deprecated constant # now returns the value of the new one. # # PLANETS = %w(mercury venus earth mars jupiter saturn uranus neptune pluto) # # (In a later update, the original implementation of `PLANETS` has been removed.) # # PLANETS_POST_2006 = %w(mercury venus earth mars jupiter saturn uranus neptune) # PLANETS = ActiveSupport::Deprecation::DeprecatedConstantProxy.new('PLANETS', 'PLANETS_POST_2006') # # PLANETS.map { |planet| planet.capitalize } # # => DEPRECATION WARNING: PLANETS is deprecated! Use PLANETS_POST_2006 instead. # (Bactrace information…) # ["Mercury", "Venus", "Earth", "Mars", "Jupiter", "Saturn", "Uranus", "Neptune"] class DeprecatedConstantProxy < DeprecationProxy def initialize(old_const, new_const, deprecator = ActiveSupport::Deprecation.instance) @old_const = old_const @new_const = new_const @deprecator = deprecator end # Returns the class of the new constant. # # PLANETS_POST_2006 = %w(mercury venus earth mars jupiter saturn uranus neptune) # PLANETS = ActiveSupport::Deprecation::DeprecatedConstantProxy.new('PLANETS', 'PLANETS_POST_2006') # PLANETS.class # => Array 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