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Contents
# frozen_string_literal: true
module RuboCop
module Cop
module Lint
# In math and Python, we can use `x < y < z` style comparison to compare
# multiple value. However, we can't use the comparison in Ruby. However,
# the comparison is not syntax error. This cop checks the bad usage of
# comparison operators.
#
# @example
#
# # bad
#
# x < y < z
# 10 <= x <= 20
#
# @example
#
# # good
#
# x < y && y < z
# 10 <= x && x <= 20
class MultipleComparison < Base
extend AutoCorrector
MSG = 'Use the `&&` operator to compare multiple values.'
COMPARISON_METHODS = %i[< > <= >=].freeze
RESTRICT_ON_SEND = COMPARISON_METHODS
def_node_matcher :multiple_compare?, <<~PATTERN
(send (send _ {:< :> :<= :>=} $_) {:#{COMPARISON_METHODS.join(' :')}} _)
PATTERN
def on_send(node)
return unless (center = multiple_compare?(node))
add_offense(node) do |corrector|
new_center = "#{center.source} && #{center.source}"
corrector.replace(center, new_center)
end
end
end
end
end
end
Version data entries
29 entries across 29 versions & 2 rubygems