Slide 34
Slide 34 text
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# frozen_string_literal: true
module ActiveSupport
module Concern
class MultipleIncludedBlocks < StandardError
def initialize
super "Cannot define multiple 'included' blocks for a Concern"
end
end
def self.extended(base)
base.instance_variable_set(:@_dependencies, [])
end
def append_features(base)
if base.instance_variable_defined?(:@_dependencies)
base.instance_variable_get(:@_dependencies) << self
false
else
return false if base < self
@_dependencies.each { |dep| base.include(dep) }
super
base.extend const_get(:ClassMethods) if const_defined?(:ClassMethods)
base.class_eval(&@_included_block) if instance_variable_defined?(:@_included_block)
end
end
def included(base = nil, &block)
if base.nil?
if instance_variable_defined?(:@_included_block)
if @_included_block.source_location != block.source_location
raise MultipleIncludedBlocks
end
else
@_included_block = block
end
else
super
end
end
def class_methods(&class_methods_module_definition)
mod = const_defined?(:ClassMethods, false) ?
const_get(:ClassMethods) :
const_set(:ClassMethods, Module.new)
mod.module_eval(&class_methods_module_definition)
end
end
end