class RuboCop::Cop::Style::CaseEquality
If ‘AllowOnSelfClass` option is enabled, the cop will ignore violations when the receiver of the case equality operator is `self.class`. Note intermediate variables are not accepted.
@example
# bad (1..100) === 7 /something/ === some_string # good something.is_a?(Array) (1..100).include?(7) /something/.match?(some_string)
@example AllowOnConstant: false (default)
# bad Array === something
@example AllowOnConstant: true
# good Array === something
@example AllowOnSelfClass: false (default)
# bad self.class === something
@example AllowOnSelfClass: true
# good self.class === something
Constants
- MSG
- RESTRICT_ON_SEND
Public Instance Methods
on_send(node)
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# File lib/rubocop/cop/style/case_equality.rb, line 52 def on_send(node) case_equality?(node) do |lhs, rhs| return if lhs.const_type? && !lhs.module_name? add_offense(node.loc.selector) do |corrector| replacement = replacement(lhs, rhs) corrector.replace(node, replacement) if replacement end end end
Private Instance Methods
begin_replacement(lhs, rhs)
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# File lib/rubocop/cop/style/case_equality.rb, line 90 def begin_replacement(lhs, rhs) return unless lhs.children.first&.range_type? "#{lhs.source}.include?(#{rhs.source})" end
const_replacement(lhs, rhs)
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# File lib/rubocop/cop/style/case_equality.rb, line 96 def const_replacement(lhs, rhs) "#{rhs.source}.is_a?(#{lhs.source})" end
offending_receiver?(node)
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# File lib/rubocop/cop/style/case_equality.rb, line 65 def offending_receiver?(node) return false if node&.const_type? && cop_config.fetch('AllowOnConstant', false) return false if self_class?(node) && cop_config.fetch('AllowOnSelfClass', false) true end
replacement(lhs, rhs)
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# File lib/rubocop/cop/style/case_equality.rb, line 72 def replacement(lhs, rhs) case lhs.type when :regexp # The automatic correction from `a === b` to `a.match?(b)` needs to # consider `Regexp.last_match?`, `$~`, `$1`, and etc. # This correction is expected to be supported by `Performance/Regexp` cop. # See: https://github.com/rubocop/rubocop-performance/issues/152 # # So here is noop. when :begin begin_replacement(lhs, rhs) when :const const_replacement(lhs, rhs) when :send send_replacement(lhs, rhs) end end
send_replacement(lhs, rhs)
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# File lib/rubocop/cop/style/case_equality.rb, line 100 def send_replacement(lhs, rhs) return unless self_class?(lhs) "#{rhs.source}.is_a?(#{lhs.source})" end