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English.rb | File | 5722 bytes | October 02 2009 10:45:39. | |
abbrev.rb | File | 2627 bytes | May 18 2011 21:19:18. | |
base64.rb | File | 2694 bytes | October 02 2009 10:45:39. | |
benchmark.rb | File | 18431 bytes | June 28 2011 06:09:46. | |
cgi.rb | File | 9519 bytes | May 16 2011 21:21:35. | |
cmath.rb | File | 7396 bytes | July 30 2011 14:53:14. | |
complex.rb | File | 380 bytes | August 16 2009 15:34:35. | |
csv.rb | File | 84647 bytes | July 21 2011 21:40:21. | |
date.rb | File | 946 bytes | May 21 2011 12:25:03. | |
debug.rb | File | 23785 bytes | June 28 2011 11:45:50. | |
delegate.rb | File | 9972 bytes | July 27 2011 19:56:28. | |
digest.rb | File | 2298 bytes | May 16 2011 20:52:55. | |
dl.rb | File | 176 bytes | June 12 2010 15:28:47. | |
drb.rb | File | 19 bytes | October 02 2009 10:45:39. | |
e2mmap.rb | File | 3896 bytes | May 19 2011 00:07:25. | |
erb.rb | File | 26334 bytes | December 13 2012 05:24:26. | |
expect.rb | File | 1364 bytes | August 26 2011 23:54:49. | |
fiddle.rb | File | 928 bytes | August 16 2011 00:51:58. | |
fileutils.rb | File | 46411 bytes | February 25 2012 08:11:07. | |
find.rb | File | 2080 bytes | May 18 2011 21:19:18. | |
forwardable.rb | File | 7823 bytes | May 22 2011 02:14:57. | |
getoptlong.rb | File | 15749 bytes | May 19 2011 00:07:25. | |
gserver.rb | File | 9044 bytes | October 31 2013 14:40:55. | |
ipaddr.rb | File | 25520 bytes | April 11 2013 02:31:05. | |
irb.rb | File | 8538 bytes | May 19 2011 00:07:25. | |
json.rb | File | 1779 bytes | August 30 2011 02:25:32. | |
kconv.rb | File | 5875 bytes | December 07 2010 11:47:39. | |
logger.rb | File | 21346 bytes | May 19 2011 00:07:25. | |
mathn.rb | File | 6681 bytes | August 26 2011 23:54:49. | |
matrix.rb | File | 48790 bytes | July 09 2011 19:11:06. | |
mkmf.rb | File | 70553 bytes | February 06 2014 05:20:52. | |
monitor.rb | File | 7102 bytes | June 17 2011 22:33:54. | |
mutex_m.rb | File | 1650 bytes | May 19 2011 00:07:25. | |
observer.rb | File | 5823 bytes | May 16 2011 21:53:12. | |
open-uri.rb | File | 26464 bytes | February 24 2014 03:43:27. | |
open3.rb | File | 21138 bytes | May 18 2011 21:19:18. | |
openssl.rb | File | 547 bytes | July 25 2011 06:38:44. | |
optparse.rb | File | 52356 bytes | February 14 2014 04:52:03. | |
ostruct.rb | File | 6650 bytes | February 24 2012 14:49:51. | |
pathname.rb | File | 14549 bytes | August 26 2011 23:54:49. | |
pp.rb | File | 13630 bytes | August 01 2010 14:09:40. | |
prettyprint.rb | File | 9859 bytes | August 02 2011 15:25:59. | |
prime.rb | File | 14312 bytes | June 01 2011 00:21:46. | |
profile.rb | File | 205 bytes | October 02 2009 10:45:39. | |
profiler.rb | File | 1626 bytes | October 02 2009 10:45:39. | |
pstore.rb | File | 16187 bytes | October 10 2011 23:14:17. | |
psych.rb | File | 10055 bytes | August 07 2012 20:50:05. | |
rake.rb | File | 2066 bytes | June 29 2011 03:09:34. | |
rational.rb | File | 308 bytes | September 24 2009 00:42:23. | |
rdoc.rb | File | 4390 bytes | February 06 2013 08:00:49. | |
resolv-replace.rb | File | 1782 bytes | October 29 2010 22:02:39. | |
resolv.rb | File | 61352 bytes | February 14 2014 06:56:54. | |
ripper.rb | File | 91 bytes | October 02 2009 10:45:39. | |
rss.rb | File | 2909 bytes | May 11 2011 10:22:16. | |
rubygems.rb | File | 34953 bytes | December 22 2013 04:38:28. | |
scanf.rb | File | 24094 bytes | May 20 2011 12:22:26. | |
securerandom.rb | File | 8662 bytes | May 07 2012 11:25:45. | |
set.rb | File | 30625 bytes | February 10 2012 08:28:48. | |
shell.rb | File | 6046 bytes | May 19 2011 00:07:25. | |
shellwords.rb | File | 3970 bytes | February 12 2012 07:51:05. | |
singleton.rb | File | 4114 bytes | May 18 2011 14:09:38. | |
socket.rb | File | 23777 bytes | January 30 2014 12:04:22. | |
syck.rb | File | 14247 bytes | July 19 2010 04:54:06. | |
sync.rb | File | 7039 bytes | June 29 2011 03:09:34. | |
tempfile.rb | File | 10669 bytes | October 31 2013 14:44:40. | |
thread.rb | File | 6747 bytes | February 14 2014 03:48:42. | |
thwait.rb | File | 3457 bytes | June 29 2011 03:09:34. | |
time.rb | File | 17440 bytes | October 31 2013 14:06:50. | |
timeout.rb | File | 3335 bytes | April 02 2013 04:09:07. | |
tmpdir.rb | File | 3812 bytes | May 18 2011 21:19:18. | |
tracer.rb | File | 6788 bytes | June 29 2011 13:19:59. | |
tsort.rb | File | 6958 bytes | March 06 2009 04:23:05. | |
ubygems.rb | File | 268 bytes | October 02 2009 10:45:39. | |
un.rb | File | 8523 bytes | May 19 2011 00:07:25. | |
uri.rb | File | 3144 bytes | May 13 2011 20:03:21. | |
weakref.rb | File | 2347 bytes | August 26 2011 23:54:49. | |
webrick.rb | File | 6964 bytes | May 10 2011 23:37:43. | |
yaml.rb | File | 2641 bytes | May 29 2013 12:00:57. |
# = delegate -- Support for the Delegation Pattern # # Documentation by James Edward Gray II and Gavin Sinclair ## # This library provides three different ways to delegate method calls to an # object. The easiest to use is SimpleDelegator. Pass an object to the # constructor and all methods supported by the object will be delegated. This # object can be changed later. # # Going a step further, the top level DelegateClass method allows you to easily # setup delegation through class inheritance. This is considerably more # flexible and thus probably the most common use for this library. # # Finally, if you need full control over the delegation scheme, you can inherit # from the abstract class Delegator and customize as needed. (If you find # yourself needing this control, have a look at Forwardable which is also in # the standard library. It may suit your needs better.) # # SimpleDelegator's implementation serves as a nice example if the use of # Delegator: # # class SimpleDelegator < Delegator # def initialize(obj) # super # pass obj to Delegator constructor, required # @delegate_sd_obj = obj # store obj for future use # end # # def __getobj__ # @delegate_sd_obj # return object we are delegating to, required # end # # def __setobj__(obj) # @delegate_sd_obj = obj # change delegation object, # # a feature we're providing # end # end # # == Notes # # Be advised, RDoc will not detect delegated methods. # class Delegator < BasicObject kernel = ::Kernel.dup kernel.class_eval do [:to_s,:inspect,:=~,:!~,:===,:<=>,:eql?,:hash].each do |m| undef_method m end end include kernel # :stopdoc: def self.const_missing(n) ::Object.const_get(n) end # :startdoc: # # Pass in the _obj_ to delegate method calls to. All methods supported by # _obj_ will be delegated to. # def initialize(obj) __setobj__(obj) end # # Handles the magic of delegation through \_\_getobj\_\_. # def method_missing(m, *args, &block) target = self.__getobj__ begin target.respond_to?(m) ? target.__send__(m, *args, &block) : super(m, *args, &block) ensure $@.delete_if {|t| %r"\A#{Regexp.quote(__FILE__)}:#{__LINE__-2}:"o =~ t} if $@ end end # # Checks for a method provided by this the delegate object by forwarding the # call through \_\_getobj\_\_. # def respond_to_missing?(m, include_private) r = self.__getobj__.respond_to?(m, include_private) if r && include_private && !self.__getobj__.respond_to?(m, false) warn "#{caller(3)[0]}: delegator does not forward private method \##{m}" return false end r end # # Returns the methods available to this delegate object as the union # of this object's and \_\_getobj\_\_ methods. # def methods __getobj__.methods | super end # # Returns the methods available to this delegate object as the union # of this object's and \_\_getobj\_\_ public methods. # def public_methods(all=true) __getobj__.public_methods(all) | super end # # Returns the methods available to this delegate object as the union # of this object's and \_\_getobj\_\_ protected methods. # def protected_methods(all=true) __getobj__.protected_methods(all) | super end # Note: no need to specialize private_methods, since they are not forwarded # # Returns true if two objects are considered of equal value. # def ==(obj) return true if obj.equal?(self) self.__getobj__ == obj end # # Returns true if two objects are not considered of equal value. # def !=(obj) return false if obj.equal?(self) __getobj__ != obj end def ! !__getobj__ end # # This method must be overridden by subclasses and should return the object # method calls are being delegated to. # def __getobj__ raise NotImplementedError, "need to define `__getobj__'" end # # This method must be overridden by subclasses and change the object delegate # to _obj_. # def __setobj__(obj) raise NotImplementedError, "need to define `__setobj__'" end # # Serialization support for the object returned by \_\_getobj\_\_. # def marshal_dump ivars = instance_variables.reject {|var| /\A@delegate_/ =~ var} [ :__v2__, ivars, ivars.map{|var| instance_variable_get(var)}, __getobj__ ] end # # Reinitializes delegation from a serialized object. # def marshal_load(data) version, vars, values, obj = data if version == :__v2__ vars.each_with_index{|var, i| instance_variable_set(var, values[i])} __setobj__(obj) else __setobj__(data) end end def initialize_clone(obj) # :nodoc: self.__setobj__(obj.__getobj__.clone) end def initialize_dup(obj) # :nodoc: self.__setobj__(obj.__getobj__.dup) end private :initialize_clone, :initialize_dup ## # :method: trust # Trust both the object returned by \_\_getobj\_\_ and self. # ## # :method: untrust # Untrust both the object returned by \_\_getobj\_\_ and self. # ## # :method: taint # Taint both the object returned by \_\_getobj\_\_ and self. # ## # :method: untaint # Untaint both the object returned by \_\_getobj\_\_ and self. # ## # :method: freeze # Freeze both the object returned by \_\_getobj\_\_ and self. # [:trust, :untrust, :taint, :untaint, :freeze].each do |method| define_method method do __getobj__.send(method) super() end end @delegator_api = self.public_instance_methods def self.public_api # :nodoc: @delegator_api end end ## # A concrete implementation of Delegator, this class provides the means to # delegate all supported method calls to the object passed into the constructor # and even to change the object being delegated to at a later time with # #__setobj__. # # Here's a simple example that takes advantage of the fact that # SimpleDelegator's delegation object can be changed at any time. # # class Stats # def initialize # @source = SimpleDelegator.new([]) # end # # def stats(records) # @source.__setobj__(records) # # "Elements: #{@source.size}\n" + # " Non-Nil: #{@source.compact.size}\n" + # " Unique: #{@source.uniq.size}\n" # end # end # # s = Stats.new # puts s.stats(%w{James Edward Gray II}) # puts # puts s.stats([1, 2, 3, nil, 4, 5, 1, 2]) # # Prints: # # Elements: 4 # Non-Nil: 4 # Unique: 4 # # Elements: 8 # Non-Nil: 7 # Unique: 6 # class SimpleDelegator<Delegator # Returns the current object method calls are being delegated to. def __getobj__ @delegate_sd_obj end # # Changes the delegate object to _obj_. # # It's important to note that this does *not* cause SimpleDelegator's methods # to change. Because of this, you probably only want to change delegation # to objects of the same type as the original delegate. # # Here's an example of changing the delegation object. # # names = SimpleDelegator.new(%w{James Edward Gray II}) # puts names[1] # => Edward # names.__setobj__(%w{Gavin Sinclair}) # puts names[1] # => Sinclair # def __setobj__(obj) raise ArgumentError, "cannot delegate to self" if self.equal?(obj) @delegate_sd_obj = obj end end # :stopdoc: def Delegator.delegating_block(mid) lambda do |*args, &block| target = self.__getobj__ begin target.__send__(mid, *args, &block) ensure $@.delete_if {|t| /\A#{Regexp.quote(__FILE__)}:#{__LINE__-2}:/o =~ t} if $@ end end end # :startdoc: # # The primary interface to this library. Use to setup delegation when defining # your class. # # class MyClass < DelegateClass(ClassToDelegateTo) # Step 1 # def initialize # super(obj_of_ClassToDelegateTo) # Step 2 # end # end # # Here's a sample of use from Tempfile which is really a File object with a # few special rules about storage location and when the File should be # deleted. That makes for an almost textbook perfect example of how to use # delegation. # # class Tempfile < DelegateClass(File) # # constant and class member data initialization... # # def initialize(basename, tmpdir=Dir::tmpdir) # # build up file path/name in var tmpname... # # @tmpfile = File.open(tmpname, File::RDWR|File::CREAT|File::EXCL, 0600) # # # ... # # super(@tmpfile) # # # below this point, all methods of File are supported... # end # # # ... # end # def DelegateClass(superclass) klass = Class.new(Delegator) methods = superclass.instance_methods methods -= ::Delegator.public_api methods -= [:to_s,:inspect,:=~,:!~,:===] klass.module_eval do def __getobj__ # :nodoc: @delegate_dc_obj end def __setobj__(obj) # :nodoc: raise ArgumentError, "cannot delegate to self" if self.equal?(obj) @delegate_dc_obj = obj end methods.each do |method| define_method(method, Delegator.delegating_block(method)) end end klass.define_singleton_method :public_instance_methods do |all=true| super(all) - superclass.protected_instance_methods end klass.define_singleton_method :protected_instance_methods do |all=true| super(all) | superclass.protected_instance_methods end return klass end # :enddoc: if __FILE__ == $0 class ExtArray<DelegateClass(Array) def initialize() super([]) end end ary = ExtArray.new p ary.class ary.push 25 p ary ary.push 42 ary.each {|x| p x} foo = Object.new def foo.test 25 end def foo.iter yield self end def foo.error raise 'this is OK' end foo2 = SimpleDelegator.new(foo) p foo2 foo2.instance_eval{print "foo\n"} p foo.test == foo2.test # => true p foo2.iter{[55,true]} # => true foo2.error # raise error! end
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