module RuboCop::Cop::DefNode

def non_public?(node)
  non_public_modifier?(node.parent) ||
    preceding_non_public_modifier?(node)
end

def preceding_non_public_modifier?(node)
  stripped_source_upto(node.first_line).any? do |line|
    NON_PUBLIC_MODIFIERS.include?(line)
  end
end

def stripped_source_upto(index)
  processed_source[0..index].map(&:strip)
end