class Sass::Tree::AttrNode

def to_s(tabs, parent_name = nil)
  if value[-1] == ?;
    raise Sass::SyntaxError.new("Invalid attribute: #{declaration.dump} (This isn't CSS!).", @line)
  end
  real_name = name
  real_name = "#{parent_name}-#{real_name}" if parent_name
  if value.empty? && children.empty?
    raise Sass::SyntaxError.new("Invalid attribute: #{declaration.dump}.", @line)
  end
  join_string = case @style
                when :compact; ' '
                when :compressed; ''
                else "\n"
                end
  spaces = '  ' * (tabs - 1)
  to_return = ''
  if !value.empty?
    to_return << "#{spaces}#{real_name}:#{@style == :compressed ? '' : ' '}#{value};#{join_string}"
  end
  children.each do |kid|
    to_return << "#{kid.to_s(tabs, real_name)}" << join_string
  end
  (@style == :compressed && parent_name) ? to_return : to_return[0...-1]
end