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module Bogus
class MakesDucks
extend Takes
takes :method_copiers, :makes_subtypes
def make(first_class, *classes)
duck = makes_subtypes.make(first_class)
classes.each do |klass|
method_copiers.each do |copier|
remove_methods(copier.call(duck), copier.call(klass))
end
end
duck
end
private
def remove_methods(duck_methods, klass_methods)
not_in_klass = duck_methods.all - klass_methods.all
not_in_klass.each { |name| duck_methods.remove(name) }
duck_methods.all.each do |name|
duck_method = duck_methods.get(name)
klass_method = klass_methods.get(name)
unless same_interface?(duck_method, klass_method)
duck_methods.remove(name)
end
end
end
def same_interface?(method1, method2)
method1.parameters == method2.parameters
end
end
end
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