class RuboCop::Cop::Style::EmptyCaseCondition

end
puts ‘more’
else
puts ‘one’
when 1
puts ‘zero’
when 0
case n
# good: (the case condition node is not empty)
end
puts ‘neither is 0’
else
puts ‘y is 0’
elsif y == 0
puts ‘x is 0’
if x == 0
# good:
end
puts ‘neither is 0’
else
puts ‘y is 0’
when y == 0
puts ‘x is 0’
when x == 0
case
# bad:
@example
This cop checks for case statements with an empty condition.

def autocorrect(corrector, case_node) 

def autocorrect(corrector, case_node)
  when_branches = case_node.when_branches
  correct_case_when(corrector, case_node, when_branches)
  correct_when_conditions(corrector, when_branches)
end

def correct_case_when(corrector, case_node, when_nodes) 

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')
  keep_first_when_comment(case_range, corrector)
  when_nodes[1..-1].each do |when_node|
    corrector.replace(when_node.loc.keyword, 'elsif')
  end
end

def correct_when_conditions(corrector, when_nodes) 

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.source_range.begin_pos,
                          conditions.last.source_range.end_pos)
    corrector.replace(range, conditions.map(&:source).join(' || '))
  end
end

def keep_first_when_comment(case_range, corrector) 

def keep_first_when_comment(case_range, corrector)
  indent = ' ' * case_range.column
  comments = processed_source.each_comment_in_lines(
    case_range.first_line...case_range.last_line
  ).map { |comment| "#{indent}#{comment.text}\n" }.join
  line_beginning = case_range.adjust(begin_pos: -case_range.column)
  corrector.insert_before(line_beginning, comments)
end

def on_case(case_node) 

def on_case(case_node)
  return if case_node.condition
  branch_bodies = [
    *case_node.when_branches.map(&:body),
    case_node.else_branch
  ].compact
  return if branch_bodies.any? do |body|
    body.return_type? ||
    body.each_descendant.any?(&:return_type?)
  end
  add_offense(case_node.loc.keyword) do |corrector|
    autocorrect(corrector, case_node)
  end
end