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Contents
# frozen_string_literal: true
module RuboCop
module Cop
module Lint
# This cop checks that there are no repeated conditions
# used in case 'when' expressions.
#
# @example
#
# # bad
#
# case x
# when 'first'
# do_something
# when 'first'
# do_something_else
# end
#
# @example
#
# # good
#
# case x
# when 'first'
# do_something
# when 'second'
# do_something_else
# end
class DuplicateCaseCondition < Cop
MSG = 'Duplicate `when` condition detected.'.freeze
def on_case(case_node)
case_node.when_branches.each_with_object([]) do |when_node, previous|
when_node.each_condition do |condition|
next unless repeated_condition?(previous, condition)
add_offense(condition)
end
previous.push(when_node.conditions)
end
end
private
def repeated_condition?(previous, condition)
previous.any? { |c| c.include?(condition) }
end
end
end
end
end
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