module Casting::SuperDelegate
Public Instance Methods
calling_location(call_stack)
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# File lib/casting/super_delegate.rb, line 51 def calling_location(call_stack) call_stack.reject { |line| line.to_s.match? Regexp.union(casting_library_matcher, gem_home_matcher, debugging_matcher) }.first end
casting_library_matcher()
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# File lib/casting/super_delegate.rb, line 61 def casting_library_matcher Regexp.new(Dir.pwd.to_s + "/lib") end
debugging_matcher()
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# File lib/casting/super_delegate.rb, line 69 def debugging_matcher Regexp.new("internal:trace_point") end
gem_home_matcher()
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# File lib/casting/super_delegate.rb, line 65 def gem_home_matcher Regexp.new(ENV["GEM_HOME"]) end
method_delegate_skipping(meth, skipped)
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# File lib/casting/super_delegate.rb, line 44 def method_delegate_skipping(meth, skipped) skipped_index = __delegates__.index(skipped) __delegates__[(skipped_index + 1)..__delegates__.length].find { |attendant| attendant_methods(attendant).include?(meth) } end
name_of_calling_method(call_stack)
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# File lib/casting/super_delegate.rb, line 57 def name_of_calling_method(call_stack) calling_location(call_stack).label.to_sym end
super_delegate(mod = :none, *args, **kwargs, &block)
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Call the method of the same name defined in the next delegate stored in your object
Because Casting
creates an alternative method lookup path using a collection of delegates, you may use ‘super_delegate` to work like `super`.
If you use this feature, be sure that you have created a delegate collection which does have the method you need or you’ll see a NoMethodError.
Example:
module Greeter
def greet "Hello" end
end
module FormalGreeter
include Casting::Super def greet "#{super_delegate}, how do you do?" end
end
some_object.cast_as(Greeter, FormalGreeter) some_object.greet #=> ‘Hello, how do you do?’
# File lib/casting/super_delegate.rb, line 30 def super_delegate(mod = :none, *args, **kwargs, &block) method_name = name_of_calling_method(caller_locations) owner = (mod unless mod == :none) || method_delegate(method_name) super_delegate_method = unbound_method_from_next_delegate(method_name, owner) super_delegate_method.bind_call(self, *args, **kwargs, &block) rescue NameError raise NoMethodError.new("super_delegate: no delegate method `#{method_name}' for #{inspect} from #{owner}") end
unbound_method_from_next_delegate(method_name, *skipped)
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# File lib/casting/super_delegate.rb, line 40 def unbound_method_from_next_delegate(method_name, *skipped) method_delegate_skipping(method_name, *skipped).instance_method(method_name) end