class RuboCop::Cop::Style::NegatedIfElseCondition


x ? do_something_else : do_something
# good
!x ? do_something : do_something_else
# bad
end
do_something
else
do_something_else
if x
# good
end
do_something_else
else
do_something
if !x
# bad
@example
which can be simplified by inverting condition and swapping branches.
Checks for uses of ‘if-else` and ternary operators with a negated condition

def self.autocorrect_incompatible_with 

def self.autocorrect_incompatible_with
  [Style::InverseMethods, Style::Not]
end

def correct_negated_condition(corrector, node) 

def correct_negated_condition(corrector, node)
  receiver, method_name, rhs = *node
  replacement =
    if node.negation_method?
      receiver.source
    else
      inverted_method = method_name.to_s.sub('!', '=')
      "#{receiver.source} #{inverted_method} #{rhs.source}"
    end
  corrector.replace(node, replacement)
end

def corrected_ancestor?(node) 

def corrected_ancestor?(node)
  node.each_ancestor(:if).any? { |ancestor| @corrected_nodes&.include?(ancestor) }
end

def else_range(node)

Collect the entire else branch, including whitespace and comments 
def else_range(node)
  if node.ternary?
    node.else_branch
  else
    range_between(node.loc.else.end_pos, node.loc.end.begin_pos)
  end
end

def if_else?(node) 

def if_else?(node)
  else_branch = node.else_branch
  !node.elsif? && else_branch && (!else_branch.if_type? || !else_branch.elsif?)
end

def if_range(node)

Collect the entire if branch, including whitespace and comments 
def if_range(node)
  if node.ternary?
    node.if_branch
  else
    range_between(node.condition.source_range.end_pos, node.loc.else.begin_pos)
  end
end

def message(node) 

def message(node)
  type = node.ternary? ? 'ternary' : 'if-else'
  format(MSG, type: type)
end

def negated_condition?(node) 

def negated_condition?(node)
  node.send_type? &&
    (node.negation_method? || NEGATED_EQUALITY_METHODS.include?(node.method_name))
end

def on_if(node) 

def on_if(node)
  return unless if_else?(node)
  return unless (condition = unwrap_begin_nodes(node.condition))
  return if double_negation?(condition) || !negated_condition?(condition)
  message = message(node)
  add_offense(node, message: message) do |corrector|
    unless corrected_ancestor?(node)
      correct_negated_condition(corrector, condition)
      swap_branches(corrector, node)
      @corrected_nodes ||= Set.new.compare_by_identity
      @corrected_nodes.add(node)
    end
  end
end

def on_new_investigation 

def on_new_investigation
  @corrected_nodes = nil
end

def swap_branches(corrector, node) 

def swap_branches(corrector, node)
  if node.if_branch.nil?
    corrector.remove(range_by_whole_lines(node.loc.else, include_final_newline: true))
  else
    corrector.swap(if_range(node), else_range(node))
  end
end

def unwrap_begin_nodes(node) 

def unwrap_begin_nodes(node)
  node = node.children.first while node && (node.begin_type? || node.kwbegin_type?)
  node
end