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Versions: 38
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Contents
# frozen_string_literal: true
module RuboCop
module Cop
module Style
# This cop checks for the presence of `method_missing` without also
# defining `respond_to_missing?`.
#
# @example
# #bad
# def method_missing(name, *args)
# # ...
# end
#
# #good
# def respond_to_missing?(name, include_private)
# # ...
# end
#
# def method_missing(name, *args)
# # ...
# end
#
class MissingRespondToMissing < Base
MSG = 'When using `method_missing`, define `respond_to_missing?`.'
def on_def(node)
return unless node.method?(:method_missing)
return if implements_respond_to_missing?(node)
add_offense(node)
end
alias on_defs on_def
private
def implements_respond_to_missing?(node)
return false unless (grand_parent = node.parent.parent)
grand_parent.each_descendant(node.type) do |descendant|
return true if descendant.method?(:respond_to_missing?)
child = descendant.children.first
return true if child.respond_to?(:method?) && child.method?(:respond_to_missing?)
end
false
end
end
end
end
end
Version data entries
38 entries across 38 versions & 6 rubygems