module RuboCop::Cop::CommentsHelp

def begin_pos_with_comment(node)
  first_comment = processed_source.ast_with_comments[node].first
  if first_comment && (first_comment.loc.line < node.loc.line)
    start_line_position(first_comment)
  else
    start_line_position(node)
  end
end

def buffer
  processed_source.buffer
end

def end_position_for(node)
  end_line = buffer.line_for_position(node.loc.expression.end_pos)
  buffer.line_range(end_line).end_pos
end

def source_range_with_comment(node)
  begin_pos = begin_pos_with_comment(node)
  end_pos = end_position_for(node)
  Parser::Source::Range.new(buffer, begin_pos, end_pos)
end

def start_line_position(node)
  buffer.line_range(node.loc.line).begin_pos - 1
end