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Contents
# frozen_string_literal: true
module RuboCop
module Cop
module Style
# This cop checks for uses of the class/module name instead of
# self, when defining class/module methods.
#
# @example
# # bad
# class SomeClass
# def SomeClass.class_method
# # ...
# end
# end
#
# # good
# class SomeClass
# def self.class_method
# # ...
# end
# end
class ClassMethods < Cop
MSG = 'Use `self.%<method>s` instead of `%<class>s.%<method>s`.'.freeze
def on_class(node)
name, _superclass, body = *node
check(name, body)
end
def on_module(node)
name, body = *node
check(name, body)
end
def autocorrect(node)
->(corrector) { corrector.replace(node.loc.name, 'self') }
end
private
def check(name, node)
return unless node
if node.defs_type?
check_defs(name, node)
elsif node.begin_type?
node.each_child_node(:defs) { |n| check_defs(name, n) }
end
end
def check_defs(name, node)
definee, method_name, _args, _body = *node
# check if the class/module name matches the definee for the defs node
return unless name == definee
_, class_name = *definee
add_offense(definee, location: :name,
message: message(class_name, method_name))
end
def message(class_name, method_name)
format(MSG, method: method_name, class: class_name)
end
end
end
end
end
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