50 lines
1.3 KiB
Ruby
50 lines
1.3 KiB
Ruby
# typed: true
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# frozen_string_literal: true
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module RuboCop
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module Cop
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module Homebrew
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# Checks to make sure safe navigation isn't used with `blank?` in
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# a conditional.
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#
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# NOTE: While the safe navigation operator is generally a good idea, when
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# checking `foo&.blank?` in a conditional, `foo` being `nil` will actually
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# do the opposite of what the author intends:
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#
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# ```ruby
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# foo&.blank? #=> nil
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# foo.blank? #=> true
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# ```
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#
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# ### Example
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#
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# ```ruby
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# # bad
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# do_something if foo&.blank?
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# do_something unless foo&.blank?
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#
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# # good
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# do_something if foo.blank?
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# do_something unless foo.blank?
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# ```
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class SafeNavigationWithBlank < Base
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extend AutoCorrector
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MSG = "Avoid calling `blank?` with the safe navigation operator in conditionals."
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def_node_matcher :safe_navigation_blank_in_conditional?, <<~PATTERN
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(if $(csend ... :blank?) ...)
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PATTERN
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def on_if(node)
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return unless safe_navigation_blank_in_conditional?(node)
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add_offense(node) do |corrector|
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corrector.replace(safe_navigation_blank_in_conditional?(node).location.dot, ".")
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end
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end
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end
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end
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end
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end
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