class RuboCop::Cop::Style::EmptyCaseCondition
This cop checks for case statements with an empty condition.
@example
# bad: case when x == 0 puts 'x is 0' when y == 0 puts 'y is 0' else puts 'neither is 0' end # good: if x == 0 puts 'x is 0' elsif y == 0 puts 'y is 0' else puts 'neither is 0' end # good: (the case condition node is not empty) case n when 0 puts 'zero' when 1 puts 'one' else puts 'more' end
Constants
- MSG
Public Instance Methods
on_case(case_node)
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# File lib/rubocop/cop/style/empty_case_condition.rb, line 42 def on_case(case_node) return if case_node.condition add_offense(case_node, location: :keyword) end
Private Instance Methods
autocorrect(case_node)
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# File lib/rubocop/cop/style/empty_case_condition.rb, line 50 def autocorrect(case_node) when_branches = case_node.when_branches lambda do |corrector| correct_case_when(corrector, case_node, when_branches) correct_when_conditions(corrector, when_branches) end end
correct_case_when(corrector, case_node, when_nodes)
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# File lib/rubocop/cop/style/empty_case_condition.rb, line 59 def correct_case_when(corrector, case_node, when_nodes) case_range = case_node.loc.keyword.join(when_nodes.first.loc.keyword) corrector.replace(case_range, 'if') when_nodes[1..-1].each do |when_node| corrector.replace(when_node.loc.keyword, 'elsif') end end
correct_when_conditions(corrector, when_nodes)
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# File lib/rubocop/cop/style/empty_case_condition.rb, line 69 def correct_when_conditions(corrector, when_nodes) when_nodes.each do |when_node| conditions = when_node.conditions next unless conditions.size > 1 range = range_between(conditions.first.loc.expression.begin_pos, conditions.last.loc.expression.end_pos) corrector.replace(range, conditions.map(&:source).join(' || ')) end end