class RuboCop::Cop::Style::NegatedIf
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
Public Instance Methods
on_if(node)
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# File lib/rubocop/cop/style/negated_if.rb, line 76 def on_if(node) return if node.unless? || 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 Instance Methods
correct_style?(node)
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# File lib/rubocop/cop/style/negated_if.rb, line 92 def correct_style?(node) (style == :prefix && node.modifier_form?) || (style == :postfix && !node.modifier_form?) end
message(node)
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# File lib/rubocop/cop/style/negated_if.rb, line 88 def message(node) format(MSG, inverse: node.inverse_keyword, current: node.keyword) end