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Versions: 9
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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
#
class DuplicateCaseCondition < Cop
MSG = 'Duplicate `when` condition detected.'.freeze
def on_case(case_node)
_condition, *whens, _else = *case_node
conditions_seen = []
whens.each do |when_node|
conditions = when_conditions(when_node)
conditions.each do |cond|
if repeated_condition?(conditions_seen, cond)
add_offense(case_node, cond.loc.expression, MSG)
end
end
conditions_seen.push(conditions)
end
end
private
def when_conditions(when_node)
when_node.to_a[0...-1]
end
def repeated_condition?(conditions_seen, condition)
conditions_seen.any? { |x| x.include?(condition) }
end
end
end
end
end
Version data entries
9 entries across 9 versions & 2 rubygems