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Contents
# frozen_string_literal: true
module RuboCop
module Cop
module InternalAffairs
# Checks that node destructuring is done either using the node
# extensions or using a splat.
#
# @example Using splat expansion
#
# # bad
# receiver, method_name, arguments = send_node.children
#
# # good
# receiver, method_name, arguments = *send_node
#
# @example Using node extensions
#
# # bad
# _receiver, method_name, _arguments = send_node.children
#
# # good
# method_name = send_node.method_name
class NodeDestructuring < Cop
MSG = 'Use the methods provided with the node extensions or ' \
'destructure the node using `*`.'.freeze
def_node_matcher :node_children_destructuring?, <<-PATTERN
(masgn (mlhs ...) (send (send nil? [#node_suffix? _]) :children))
PATTERN
def on_masgn(node)
node_children_destructuring?(node) do
add_offense(node)
end
end
private
def node_suffix?(method_name)
method_name.to_s.end_with?('node')
end
end
end
end
end
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