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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. |
# # forwardable.rb - # $Release Version: 1.1$ # $Revision: 31685 $ # by Keiju ISHITSUKA(keiju@ishitsuka.com) # original definition by delegator.rb # Revised by Daniel J. Berger with suggestions from Florian Gross. # # Documentation by James Edward Gray II and Gavin Sinclair # # == Introduction # # This library allows you delegate method calls to an object, on a method by # method basis. # # == Notes # # Be advised, RDoc will not detect delegated methods. # # <b>forwardable.rb provides single-method delegation via the # def_delegator() and def_delegators() methods. For full-class # delegation via DelegateClass(), see delegate.rb.</b> # # == Examples # # === Forwardable # # Forwardable makes building a new class based on existing work, with a proper # interface, almost trivial. We want to rely on what has come before obviously, # but with delegation we can take just the methods we need and even rename them # as appropriate. In many cases this is preferable to inheritance, which gives # us the entire old interface, even if much of it isn't needed. # # class Queue # extend Forwardable # # def initialize # @q = [ ] # prepare delegate object # end # # # setup preferred interface, enq() and deq()... # def_delegator :@q, :push, :enq # def_delegator :@q, :shift, :deq # # # support some general Array methods that fit Queues well # def_delegators :@q, :clear, :first, :push, :shift, :size # end # # q = Queue.new # q.enq 1, 2, 3, 4, 5 # q.push 6 # # q.shift # => 1 # while q.size > 0 # puts q.deq # end # # q.enq "Ruby", "Perl", "Python" # puts q.first # q.clear # puts q.first # # <i>Prints:</i> # # 2 # 3 # 4 # 5 # 6 # Ruby # nil # # SingleForwardable can be used to setup delegation at the object level as well. # # printer = String.new # printer.extend SingleForwardable # prepare object for delegation # printer.def_delegator "STDOUT", "puts" # add delegation for STDOUT.puts() # printer.puts "Howdy!" # # Also, SingleForwardable can be use to Class or Module. # # module Facade # extend SingleForwardable # def_delegator :Implementation, :service # # class Implementation # def service... # end # end # # If you want to use both Forwardable and SingleForwardable, you can # use methods def_instance_delegator and def_single_delegator, etc. # # If the object isn't a Module and Class, You can too extend # Forwardable module. # printer = String.new # printer.extend Forwardable # prepare object for delegation # printer.def_delegator "STDOUT", "puts" # add delegation for STDOUT.puts() # printer.puts "Howdy!" # # <i>Prints:</i> # # Howdy! # # The Forwardable module provides delegation of specified # methods to a designated object, using the methods #def_delegator # and #def_delegators. # # For example, say you have a class RecordCollection which # contains an array <tt>@records</tt>. You could provide the lookup method # #record_number(), which simply calls #[] on the <tt>@records</tt> # array, like this: # # class RecordCollection # extend Forwardable # def_delegator :@records, :[], :record_number # end # # Further, if you wish to provide the methods #size, #<<, and #map, # all of which delegate to @records, this is how you can do it: # # class RecordCollection # # extend Forwardable, but we did that above # def_delegators :@records, :size, :<<, :map # end # f = Foo.new # f.printf ... # f.gets # f.content_at(1) # # Also see the example at forwardable.rb. module Forwardable FORWARDABLE_VERSION = "1.1.0" @debug = nil class << self attr_accessor :debug end # Takes a hash as its argument. The key is a symbol or an array of # symbols. These symbols correspond to method names. The value is # the accessor to which the methods will be delegated. # # :call-seq: # delegate method => accessor # delegate [method, method, ...] => accessor # def instance_delegate(hash) hash.each{ |methods, accessor| methods = [methods] unless methods.respond_to?(:each) methods.each{ |method| def_instance_delegator(accessor, method) } } end # # Shortcut for defining multiple delegator methods, but with no # provision for using a different name. The following two code # samples have the same effect: # # def_delegators :@records, :size, :<<, :map # # def_delegator :@records, :size # def_delegator :@records, :<< # def_delegator :@records, :map # def def_instance_delegators(accessor, *methods) methods.delete("__send__") methods.delete("__id__") for method in methods def_instance_delegator(accessor, method) end end # Define +method+ as delegator instance method with an optional # alias name +ali+. Method calls to +ali+ will be delegated to # +accessor.method+. # # class MyQueue # extend Forwardable # attr_reader :queue # def initialize # @queue = [] # end # # def_delegator :@queue, :push, :mypush # end # # q = MyQueue.new # q.mypush 42 # q.queue #=> [42] # q.push 23 #=> NoMethodError # def def_instance_delegator(accessor, method, ali = method) line_no = __LINE__; str = %{ def #{ali}(*args, &block) begin #{accessor}.__send__(:#{method}, *args, &block) rescue Exception $@.delete_if{|s| %r"#{Regexp.quote(__FILE__)}"o =~ s} unless Forwardable::debug ::Kernel::raise end end } # If it's not a class or module, it's an instance begin module_eval(str, __FILE__, line_no) rescue instance_eval(str, __FILE__, line_no) end end alias delegate instance_delegate alias def_delegators def_instance_delegators alias def_delegator def_instance_delegator end # # Usage of The SingleForwardable is like Fowadable module. # module SingleForwardable # Takes a hash as its argument. The key is a symbol or an array of # symbols. These symbols correspond to method names. The value is # the accessor to which the methods will be delegated. # # :call-seq: # delegate method => accessor # delegate [method, method, ...] => accessor # def single_delegate(hash) hash.each{ |methods, accessor| methods = [methods] unless methods.respond_to?(:each) methods.each{ |method| def_single_delegator(accessor, method) } } end # # Shortcut for defining multiple delegator methods, but with no # provision for using a different name. The following two code # samples have the same effect: # # def_delegators :@records, :size, :<<, :map # # def_delegator :@records, :size # def_delegator :@records, :<< # def_delegator :@records, :map # def def_single_delegators(accessor, *methods) methods.delete("__send__") methods.delete("__id__") for method in methods def_single_delegator(accessor, method) end end # # Defines a method _method_ which delegates to _obj_ (i.e. it calls # the method of the same name in _obj_). If _new_name_ is # provided, it is used as the name for the delegate method. # def def_single_delegator(accessor, method, ali = method) str = %{ def #{ali}(*args, &block) begin #{accessor}.__send__(:#{method}, *args, &block) rescue Exception $@.delete_if{|s| %r"#{Regexp.quote(__FILE__)}"o =~ s} unless Forwardable::debug ::Kernel::raise end end } instance_eval(str, __FILE__, __LINE__) end alias delegate single_delegate alias def_delegators def_single_delegators alias def_delegator def_single_delegator end
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