module RuboCop::Cop::ConfigurableFormatting

def check_name(node, name, name_range)
  if valid_name?(node, name)
    correct_style_detected
  else
    add_offense(name_range, message: message(style)) { report_opposing_styles(node, name) }
  end
end

def class_emitter_method?(node, name)
  return false unless node.parent && node.defs_type?
  # a class emitter method may be defined inside `def self.included`,
  # `def self.extended`, etc.
  node = node.parent while node.parent.defs_type?
  node.parent.each_child_node(:class).any? { |c| c.loc.name.is?(name.to_s) }
end

def report_opposing_styles(node, name)
  alternative_styles.each do |alternative|
    return unexpected_style_detected(alternative) if valid_name?(node, name, alternative)
  end
end

def valid_name?(node, name, given_style = style)
  name.match?(self.class::FORMATS.fetch(given_style)) || class_emitter_method?(node, name)
end