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May 24, 2013 07:57
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rubymotion Forwardable module
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| 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 | |
| def def_instance_delegator(accessor, method, ali = method) | |
| accessor = accessor.id2name if accessor.kind_of?(Integer) | |
| method = method.id2name if method.kind_of?(Integer) | |
| ali = ali.id2name if ali.kind_of?(Integer) | |
| activity = Proc.new do | |
| define_method("#{ali}") do |*args, &block| | |
| begin | |
| instance_variable_get(accessor).__send__(method, *args, &block) | |
| rescue Exception | |
| $@.delete_if{|s| %r"#{Regexp.quote(__FILE__)}"o =~ s} unless Forwardable::debug | |
| Kernel::raise | |
| end | |
| end | |
| end | |
| # If it's not a class or module, it's an instance | |
| begin | |
| module_eval(&activity) | |
| rescue | |
| instance_eval(&activity) | |
| end | |
| end | |
| alias delegate instance_delegate | |
| alias def_delegators def_instance_delegators | |
| alias def_delegator def_instance_delegator | |
| end | |
| 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) | |
| instance_eval do | |
| define_method("#{ali}") do |*args, &block| | |
| begin | |
| instance_variable_get(accessor).__send__(method, *args, &block) | |
| rescue Exception | |
| $@.delete_if{|s| %r"#{Regexp.quote(__FILE__)}"o =~ s} unless Forwardable::debug | |
| ::Kernel::raise | |
| end | |
| end | |
| end | |
| end | |
| alias delegate single_delegate | |
| alias def_delegators def_single_delegators | |
| alias def_delegator def_single_delegator | |
| end |
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Nice one! Thanks for sharing.