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Contents
# frozen_string_literal: true
module RuboCop
module Cop
module Style
# Checks for uses of if with a negated condition. Only ifs
# without else are considered. There are three different styles:
#
# - both
# - prefix
# - postfix
#
# @example EnforcedStyle: both (default)
# # enforces `unless` for `prefix` and `postfix` conditionals
#
# # bad
#
# if !foo
# bar
# end
#
# # good
#
# unless foo
# bar
# end
#
# # bad
#
# bar if !foo
#
# # good
#
# bar unless foo
#
# @example EnforcedStyle: prefix
# # enforces `unless` for just `prefix` conditionals
#
# # bad
#
# if !foo
# bar
# end
#
# # good
#
# unless foo
# bar
# end
#
# # good
#
# bar if !foo
#
# @example EnforcedStyle: postfix
# # enforces `unless` for just `postfix` conditionals
#
# # bad
#
# bar if !foo
#
# # good
#
# bar unless foo
#
# # good
#
# if !foo
# bar
# end
class NegatedIf < Cop
include ConfigurableEnforcedStyle
include NegativeConditional
def on_if(node)
return if node.elsif? || node.ternary?
return if correct_style?(node)
check_negative_conditional(node)
end
def autocorrect(node)
ConditionCorrector.correct_negative_condition(node)
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
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