module RuboCop::Cop::OrderedGemNode

def case_insensitive_out_of_order?(string_a, string_b)
  string_a.downcase < string_b.downcase
end

def consecutive_lines(previous, current)
  first_line = get_source_range(
    current,
    treat_comments_as_separators
  ).first_line
  previous.source_range.last_line == first_line - 1
end

def find_gem_name(gem_node)
  return gem_node.str_content if gem_node.str_type?
  find_gem_name(gem_node.receiver)
end

def gem_name(declaration_node)
  gem_node = declaration_node.first_argument
  find_gem_name(gem_node)
end

def get_source_range(node, comments_as_separators)
  unless comments_as_separators
    first_comment = processed_source.ast_with_comments[node].first
    return first_comment.loc.expression unless first_comment.nil?
  end
  node.source_range
end

def register_offense(previous, current)
  message = format(
    self.class::MSG,
    previous: gem_name(current),
    current: gem_name(previous)
  )
  add_offense(current, message: message)
end

def treat_comments_as_separators
  cop_config['TreatCommentsAsGroupSeparators']
end