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(case_node) 

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

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_node, when_nodes.first, 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.loc.expression.begin_pos,
                          conditions.last.loc.expression.end_pos)
    corrector.replace(range, conditions.map(&:source).join(' || '))
  end
end

def keep_first_when_comment(case_node, first_when_node, corrector) 

def keep_first_when_comment(case_node, first_when_node, corrector)
  comment = processed_source.comments_before_line(
    first_when_node.loc.keyword.line
  ).map(&:text).join("\n")
  line = range_by_whole_lines(case_node.source_range)
  corrector.insert_before(line, "#{comment}\n") if !comment.empty? &&
                                                   !case_node.parent
end

def on_case(case_node) 

def on_case(case_node)
  return if case_node.condition
  return if case_node.when_branches.any? do |when_branch|
    when_branch.each_descendant.any?(&:return_type?)
  end
  if (else_branch = case_node.else_branch)
    return if else_branch.return_type? ||
              else_branch.each_descendant.any?(&:return_type?)
  end
  add_offense(case_node, location: :keyword)
end