class Sass::Tree::RootNode

def _to_s(*args)
  result = String.new
  children.each do |child|
    next if child.invisible?
    child_str = child.to_s(1)
    result << child_str + (style == :compressed ? '' : "\n")
  end
  result.rstrip!
  return "" if result.empty?
  return result + "\n"
end

def cssize(extends = Haml::Util::SubsetMap.new, parent = nil)
  return super(extends), extends
rescue Sass::SyntaxError => e
  e.sass_template = @template
  raise e
end

def initialize(template)
  super()
  @template = template
end

def invalid_child?(child)
  return unless child.is_a?(Tree::PropNode)
  "Properties aren't allowed at the root of a document." +
    child.pseudo_class_selector_message
end

def perform(environment)
  environment.options = @options if environment.options.nil? || environment.options.empty?
  super
rescue Sass::SyntaxError => e
  e.sass_template = @template
  raise e
end

def perform!(environment)
  environment.options = @options if environment.options.nil? || environment.options.empty?
  super
end

def render
  result, extends = perform(Environment.new).cssize
  result = result.do_extend(extends) unless extends.empty?
  result.to_s
end

def to_s(*args)
  super
rescue Sass::SyntaxError => e
  e.sass_template = @template
  raise e
end

def to_sass(opts = {})
  to_src(opts, :sass)
end

def to_scss(opts = {})
  to_src(opts, :scss)
end

def to_src(opts, fmt)
  Haml::Util.enum_cons(children + [nil], 2).map do |child, nxt|
    child.send("to_#{fmt}", 0, opts) +
      if nxt &&
          (child.is_a?(CommentNode) && child.line + child.value.count("\n") + 1 == nxt.line) ||
          (child.is_a?(ImportNode) && nxt.is_a?(ImportNode) && child.line + 1 == nxt.line) ||
          (child.is_a?(VariableNode) && nxt.is_a?(VariableNode) && child.line + 1 == nxt.line)
        ""
      else
        "\n"
      end
  end.join.rstrip + "\n"
end