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Contents
# frozen_string_literal: true
module RuboCop
module Cop
module Style
# Checks for uses of unless with a negated condition. Only unless
# without else are considered. There are three different styles:
#
# * both
# * prefix
# * postfix
#
# @example EnforcedStyle: both (default)
# # enforces `if` for `prefix` and `postfix` conditionals
#
# # bad
# unless !foo
# bar
# end
#
# # good
# if foo
# bar
# end
#
# # bad
# bar unless !foo
#
# # good
# bar if foo
#
# @example EnforcedStyle: prefix
# # enforces `if` for just `prefix` conditionals
#
# # bad
# unless !foo
# bar
# end
#
# # good
# if foo
# bar
# end
#
# # good
# bar unless !foo
#
# @example EnforcedStyle: postfix
# # enforces `if` for just `postfix` conditionals
#
# # bad
# bar unless !foo
#
# # good
# bar if foo
#
# # good
# unless !foo
# bar
# end
class NegatedUnless < Base
include ConfigurableEnforcedStyle
include NegativeConditional
extend AutoCorrector
def on_if(node)
return if node.if? || node.elsif? || node.ternary?
return if correct_style?(node)
message = message(node)
check_negative_conditional(node, message: message) do |corrector|
ConditionCorrector.correct_negative_condition(corrector, node)
end
end
private
def message(node)
format(MSG, inverse: node.inverse_keyword, current: node.keyword)
end
def correct_style?(node)
(style == :prefix && node.modifier_form?) || (style == :postfix && !node.modifier_form?)
end
end
end
end
end
Version data entries
208 entries across 199 versions & 19 rubygems