class Opal::Nodes::IfNode

def could_become_switch_branch?(body)
  if !body
    return true
  elsif body.type != :if
    if valid_switch_body?(body)
      body.meta[:switch_default] = true
      return true
    end
    return false
  end
  test, true_body, false_body = *body
  test_match = SWITCH_BRANCH_TEST_MATCH.match(test) || SWITCH_BRANCH_TEST_MATCH_CONTINUED.match(test)
  unless test_match
    if valid_switch_body?(body, true)
      body.meta[:switch_default] = true
      return true
    end
  end
  switch_test, switch_variable, additional_rules = *test_match
  switch_additional_rules = handle_additional_switch_rules(additional_rules)
  return false unless switch_additional_rules # It's ok for them to be empty, but false denotes a mismatch
  return false unless switch_variable == @switch_variable
  return false unless valid_switch_body?(true_body)
  return false unless could_become_switch_branch?(false_body)
  body.meta.merge!(switch_child: true,
                   switch_test: switch_test,
                   switch_variable: @switch_variable,
                   switch_additional_rules: switch_additional_rules
  )
  true
end