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Name	Size	Permission
cgi	[ DIR ]	drwxr-xr-x
date	[ DIR ]	drwxr-xr-x
digest	[ DIR ]	drwxr-xr-x
dl	[ DIR ]	drwxr-xr-x
drb	[ DIR ]	drwxr-xr-x
fiddle	[ DIR ]	drwxr-xr-x
io	[ DIR ]	drwxr-xr-x
irb	[ DIR ]	drwxr-xr-x
json	[ DIR ]	drwxr-xr-x
matrix	[ DIR ]	drwxr-xr-x
net	[ DIR ]	drwxr-xr-x
openssl	[ DIR ]	drwxr-xr-x
optparse	[ DIR ]	drwxr-xr-x
psych	[ DIR ]	drwxr-xr-x
racc	[ DIR ]	drwxr-xr-x
rake	[ DIR ]	drwxr-xr-x
rbconfig	[ DIR ]	drwxr-xr-x
rdoc	[ DIR ]	drwxr-xr-x
rexml	[ DIR ]	drwxr-xr-x
rinda	[ DIR ]	drwxr-xr-x
ripper	[ DIR ]	drwxr-xr-x
rss	[ DIR ]	drwxr-xr-x
rubygems	[ DIR ]	drwxr-xr-x
shell	[ DIR ]	drwxr-xr-x
syslog	[ DIR ]	drwxr-xr-x
test	[ DIR ]	drwxr-xr-x
uri	[ DIR ]	drwxr-xr-x
webrick	[ DIR ]	drwxr-xr-x
x86_64-linux-gnu	[ DIR ]	drwxr-xr-x
xmlrpc	[ DIR ]	drwxr-xr-x
yaml	[ DIR ]	drwxr-xr-x
English.rb	6.44 KB	-rw-r--r--
abbrev.rb	3.31 KB	-rw-r--r--
base64.rb	2.63 KB	-rw-r--r--
benchmark.rb	17.95 KB	-rw-r--r--
cgi.rb	9.84 KB	-rw-r--r--
cmath.rb	8.93 KB	-rw-r--r--
complex.rb	380 B	-rw-r--r--
csv.rb	81.68 KB	-rw-r--r--
date.rb	946 B	-rw-r--r--
debug.rb	29.08 KB	-rw-r--r--
delegate.rb	11.13 KB	-rw-r--r--
digest.rb	2.34 KB	-rw-r--r--
dl.rb	280 B	-rw-r--r--
drb.rb	19 B	-rw-r--r--
e2mmap.rb	3.89 KB	-rw-r--r--
erb.rb	26.07 KB	-rw-r--r--
expect.rb	2.14 KB	-rw-r--r--
fiddle.rb	1.65 KB	-rw-r--r--
fileutils.rb	47.17 KB	-rw-r--r--
find.rb	2.36 KB	-rw-r--r--
forwardable.rb	7.86 KB	-rw-r--r--
getoptlong.rb	15.38 KB	-rw-r--r--
gserver.rb	8.86 KB	-rw-r--r--
ipaddr.rb	17.05 KB	-rw-r--r--
irb.rb	20.03 KB	-rw-r--r--
json.rb	1.74 KB	-rw-r--r--
kconv.rb	5.74 KB	-rw-r--r--
logger.rb	22.37 KB	-rw-r--r--
mathn.rb	6.52 KB	-rw-r--r--
matrix.rb	45.43 KB	-rw-r--r--
mkmf.rb	80.5 KB	-rw-r--r--
monitor.rb	6.93 KB	-rw-r--r--
mutex_m.rb	2 KB	-rw-r--r--
observer.rb	5.81 KB	-rw-r--r--
open-uri.rb	24.27 KB	-rw-r--r--
open3.rb	20.37 KB	-rw-r--r--
openssl.rb	528 B	-rw-r--r--
optparse.rb	50.8 KB	-rw-r--r--
ostruct.rb	7.7 KB	-rw-r--r--
pathname.rb	15.3 KB	-rw-r--r--
pp.rb	14.1 KB	-rw-r--r--
prettyprint.rb	16.33 KB	-rw-r--r--
prime.rb	13.2 KB	-rw-r--r--
profile.rb	205 B	-rw-r--r--
profiler.rb	4.51 KB	-rw-r--r--
pstore.rb	14.85 KB	-rw-r--r--
psych.rb	14.88 KB	-rw-r--r--
rake.rb	2.12 KB	-rw-r--r--
rational.rb	308 B	-rw-r--r--
rdoc.rb	4.92 KB	-rw-r--r--
resolv-replace.rb	1.73 KB	-rw-r--r--
resolv.rb	72.31 KB	-rw-r--r--
ripper.rb	2.53 KB	-rw-r--r--
rss.rb	2.84 KB	-rw-r--r--
rubygems.rb	30.97 KB	-rw-r--r--
scanf.rb	23.54 KB	-rw-r--r--
securerandom.rb	8.49 KB	-rw-r--r--
set.rb	18.7 KB	-rw-r--r--
shell.rb	10.3 KB	-rw-r--r--
shellwords.rb	5.94 KB	-rw-r--r--
singleton.rb	4.02 KB	-rw-r--r--
socket.rb	25.6 KB	-rw-r--r--
sync.rb	7.25 KB	-rw-r--r--
tempfile.rb	11.4 KB	-rw-r--r--
thwait.rb	3.38 KB	-rw-r--r--
time.rb	21.32 KB	-rw-r--r--
timeout.rb	3.7 KB	-rw-r--r--
tmpdir.rb	4.15 KB	-rw-r--r--
tracer.rb	6.4 KB	-rw-r--r--
tsort.rb	14.14 KB	-rw-r--r--
ubygems.rb	268 B	-rw-r--r--
un.rb	8.87 KB	-rw-r--r--
uri.rb	3.07 KB	-rw-r--r--
weakref.rb	3.23 KB	-rw-r--r--
webrick.rb	6.69 KB	-rw-r--r--
xmlrpc.rb	8.49 KB	-rw-r--r--
yaml.rb	2.31 KB	-rw-r--r--

Code Editor : forwardable.rb

#
#   forwardable.rb -
#       $Release Version: 1.1$
#       $Revision: 40906 $
#       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

# 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:
#
#   require 'forwardable'
#
#   class RecordCollection
#     attr_accessor :records
#     extend Forwardable
#     def_delegator :@records, :[], :record_number
#   end
#
# We can use the lookup method like so:
#
#   r = RecordCollection.new
#   r.records = [4,5,6]
#   r.record_number(0)  # => 4
#
# 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 # re-open RecordCollection class
#     def_delegators :@records, :size, :<<, :map
#   end
#
#   r = RecordCollection.new
#   r.records = [1,2,3]
#   r.record_number(0)   # => 1
#   r.size               # => 3
#   r << 4               # => [1, 2, 3, 4]
#   r.map { |x| x * 2 }  # => [2, 4, 6, 8]
#
# You can even extend regular objects with Forwardable.
#
#   my_hash = Hash.new
#   my_hash.extend Forwardable              # prepare object for delegation
#   my_hash.def_delegator "STDOUT", "puts"  # add delegation for STDOUT.puts()
#   my_hash.puts "Howdy!"
#
# == Another example
#
# 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
#
# This should output:
#
#   2
#   3
#   4
#   5
#   6
#   Ruby
#   nil
#
# == Notes
#
# Be advised, RDoc will not detect delegated methods.
#
# +forwardable.rb+ provides single-method delegation via the def_delegator and
# def_delegators methods. For full-class delegation via DelegateClass, see
# +delegate.rb+.
#
module Forwardable
  # Version of +forwardable.rb+
  FORWARDABLE_VERSION = "1.1.0"

FILE_REGEXP = %r"#{Regexp.quote(__FILE__)}"

@debug = nil
  class << self
    # If true, <tt>__FILE__</tt> will remain in the backtrace in the event an
    # Exception is raised.
    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| Forwardable::FILE_REGEXP =~ 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

# 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 used to set up delegation for a Class or Module.
#
#   class Implementation
#     def self.service
#       puts "serviced!"
#     end
#   end
#
#   module Facade
#     extend SingleForwardable
#     def_delegator :Implementation, :service
#   end
#
#   Facade.service #=> serviced!
#
# If you want to use both Forwardable and SingleForwardable, you can
# use methods def_instance_delegator and def_single_delegator, etc.
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

# :call-seq:
  #   def_single_delegator(accessor, method, new_name=method)
  #
  # Defines a method _method_ which delegates to _accessor_ (i.e. it calls
  # the method of the same name in _accessor_).  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| Forwardable::FILE_REGEXP =~ 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

${this.title}

Code Editor : forwardable.rb