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Contents
# frozen_string_literal: true
module RuboCop
module Cop
module Performance
# This cop is used to identify usages of `reverse.each` and
# change them to use `reverse_each` instead.
#
# @example
# # bad
# [].reverse.each
#
# # good
# [].reverse_each
class ReverseEach < Cop
include RangeHelp
MSG = 'Use `reverse_each` instead of `reverse.each`.'.freeze
UNDERSCORE = '_'.freeze
def_node_matcher :reverse_each?, <<-MATCHER
(send $(send _ :reverse) :each)
MATCHER
def on_send(node)
reverse_each?(node) do |receiver|
location_of_reverse = receiver.loc.selector.begin_pos
end_location = node.loc.selector.end_pos
range = range_between(location_of_reverse, end_location)
add_offense(node, location: range)
end
end
def autocorrect(node)
->(corrector) { corrector.replace(node.loc.dot, UNDERSCORE) }
end
end
end
end
end
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