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Contents
# frozen_string_literal: true
module RuboCop
module Cop
module Style
# This cop checks for potential uses of `Enumerable#minmax`.
#
# @example
#
# # bad
# bar = [foo.min, foo.max]
# return foo.min, foo.max
#
# # good
# bar = foo.minmax
# return foo.minmax
class MinMax < Cop
MSG = 'Use `%<receiver>s.minmax` instead of `%<offender>s`.'.freeze
def on_array(node)
min_max_candidate(node) do |receiver|
offender = offending_range(node)
add_offense(node, location: offender,
message: message(offender, receiver))
end
end
alias on_return on_array
def autocorrect(node)
receiver = node.children.first.receiver
lambda do |corrector|
corrector.replace(offending_range(node),
"#{receiver.source}.minmax")
end
end
private
def_node_matcher :min_max_candidate, <<-PATTERN
({array return} (send [$_receiver !nil?] :min) (send [$_receiver !nil?] :max))
PATTERN
def message(offender, receiver)
format(MSG, offender: offender.source,
receiver: receiver.source)
end
def offending_range(node)
case node.type
when :return
argument_range(node)
else
node.loc.expression
end
end
def argument_range(node)
first_argument_range = node.children.first.loc.expression
last_argument_range = node.children.last.loc.expression
first_argument_range.join(last_argument_range)
end
end
end
end
end
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