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class Module
  # Encapsulates the common pattern of:
  #
  #   alias_method :foo_without_feature, :foo
  #   alias_method :foo, :foo_with_feature
  #
  # With this, you simply do:
  #
  #   alias_method_chain :foo, :feature
  #
  # And both aliases are set up for you.
  #
  # Query and bang methods (foo?, foo!) keep the same punctuation:
  #
  #   alias_method_chain :foo?, :feature
  #
  # is equivalent to
  #
  #   alias_method :foo_without_feature?, :foo?
  #   alias_method :foo?, :foo_with_feature?
  #
  # so you can safely chain foo, foo?, and foo! with the same feature.
  def alias_method_chain(target, feature)
    # Strip out punctuation on predicates or bang methods since
    # e.g. target?_without_feature is not a valid method name.
    aliased_target, punctuation = target.to_s.sub(/([?!=])$/, ''), $1
    yield(aliased_target, punctuation) if block_given?

    with_method, without_method = "#{aliased_target}_with_#{feature}#{punctuation}", "#{aliased_target}_without_#{feature}#{punctuation}"

    alias_method without_method, target
    alias_method target, with_method

    case
      when public_method_defined?(without_method)
        public target
      when protected_method_defined?(without_method)
        protected target
      when private_method_defined?(without_method)
        private target
    end
  end unless method_defined?(:alias_method_chain)
end

Version data entries

25 entries across 25 versions & 1 rubygems

Version Path
gorillib-0.6.0 lib/gorillib/deprecated/metaprogramming/aliasing.rb
gorillib-0.5.2 lib/gorillib/deprecated/metaprogramming/aliasing.rb
gorillib-0.5.0 lib/gorillib/deprecated/metaprogramming/aliasing.rb
gorillib-0.4.2 lib/gorillib/deprecated/metaprogramming/aliasing.rb
gorillib-0.4.2pre lib/gorillib/deprecated/metaprogramming/aliasing.rb
gorillib-0.4.0pre lib/gorillib/metaprogramming/aliasing.rb
gorillib-0.4.1pre lib/gorillib/metaprogramming/aliasing.rb
gorillib-0.1.11 lib/gorillib/metaprogramming/aliasing.rb
gorillib-0.1.9 lib/gorillib/metaprogramming/aliasing.rb
gorillib-0.1.8 lib/gorillib/metaprogramming/aliasing.rb
gorillib-0.1.7 lib/gorillib/metaprogramming/aliasing.rb
gorillib-0.1.6 lib/gorillib/metaprogramming/aliasing.rb
gorillib-0.1.5 lib/gorillib/metaprogramming/aliasing.rb
gorillib-0.1.4 lib/gorillib/metaprogramming/aliasing.rb
gorillib-0.1.3 lib/gorillib/metaprogramming/aliasing.rb
gorillib-0.1.2 lib/gorillib/metaprogramming/aliasing.rb
gorillib-0.1.1 lib/gorillib/metaprogramming/aliasing.rb
gorillib-0.1.0 lib/gorillib/metaprogramming/aliasing.rb
gorillib-0.0.8 lib/gorillib/metaprogramming/aliasing.rb
gorillib-0.0.7 lib/gorillib/metaprogramming/aliasing.rb