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Contents
# frozen_string_literal: true
module RuboCop
module Cop
module Style
# This cop checks that `include`, `extend` and `prepend` statements appear
# inside classes and modules, not at the top level, so as to not affect
# the behavior of `Object`.
#
# @example
# # bad
# include M
#
# class C
# end
#
# # bad
# extend M
#
# class C
# end
#
# # bad
# prepend M
#
# class C
# end
#
# # good
# class C
# include M
# end
#
# # good
# class C
# extend M
# end
#
# # good
# class C
# prepend M
# end
class MixinUsage < Cop
MSG = '`%<statement>s` is used at the top level. Use inside `class` ' \
'or `module`.'.freeze
def_node_matcher :include_statement, <<-PATTERN
(send nil? ${:include :extend :prepend}
const)
PATTERN
def on_send(node)
include_statement(node) do |statement|
return if node.argument? ||
accepted_include?(node) ||
belongs_to_class_or_module?(node)
add_offense(node, message: format(MSG, statement: statement))
end
end
private
def accepted_include?(node)
node.parent && node.macro?
end
def belongs_to_class_or_module?(node)
if !node.parent
false
else
return true if node.parent.class_type? || node.parent.module_type?
belongs_to_class_or_module?(node.parent)
end
end
end
end
end
end
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