65 lines
1.7 KiB
Ruby
65 lines
1.7 KiB
Ruby
# frozen_string_literal: true
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# We're patching `ActiveSupport::Concern` in
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# config/initializers/0_as_concern.rb
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#
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# We want to patch `ActiveSupport::Concern` for two reasons:
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# 1. Allow defining class methods via: `class_methods` method
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# 2. Allow `prepended do; end` work like `included do; end`
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# If we don't need anything above, we don't need this patch nor the concern!
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# rubocop:disable Gitlab/ModuleWithInstanceVariables
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module Gitlab
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module Patch
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module Prependable
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class MultiplePrependedBlocks < StandardError
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def initialize
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super "Cannot define multiple 'prepended' blocks for a Concern"
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end
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end
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def prepend_features(base)
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return false if prepended?(base)
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super
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if const_defined?(:ClassMethods)
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klass_methods = const_get(:ClassMethods)
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base.singleton_class.prepend klass_methods
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base.instance_variable_set(:@_prepended_class_methods, klass_methods)
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end
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if instance_variable_defined?(:@_prepended_block)
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base.class_eval(&@_prepended_block)
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end
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true
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end
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def class_methods
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super
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if instance_variable_defined?(:@_prepended_class_methods)
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const_get(:ClassMethods).prepend @_prepended_class_methods
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end
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end
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def prepended(base = nil, &block)
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if base.nil?
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raise MultiplePrependedBlocks if
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instance_variable_defined?(:@_prepended_block)
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@_prepended_block = block
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else
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super
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end
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end
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def prepended?(base)
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index = base.ancestors.index(base)
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base.ancestors[0...index].index(self)
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end
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end
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end
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end
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