class Nokogiri::XML::DocumentFragment

def self.parse(tags, options = ParseOptions::DEFAULT_XML, &block)
  new(XML::Document.new, tags, nil, options, &block)
end

def css(*args)
  if children.any?
    children.css(*args) # 'children' is a smell here
  else
    NodeSet.new(document)
  end
end

def dup
  new_document = document.dup
  new_fragment = self.class.new(new_document)
  children.each do |child|
    child.dup(1, new_document).parent = new_fragment
  end
  new_fragment
end

def errors
  document.errors
end

def errors=(things) # :nodoc:
  document.errors = things
end

def fragment(data)
  document.fragment(data)
end

def initialize(document, tags = nil, ctx = nil, options = ParseOptions::DEFAULT_XML)
  return self unless tags
  options = Nokogiri::XML::ParseOptions.new(options) if Integer === options
  yield options if block_given?
  children = if ctx
    # Fix for issue#490
    if Nokogiri.jruby?
      # fix for issue #770
      ctx.parse("<root #{namespace_declarations(ctx)}>#{tags}</root>", options).children
    else
      ctx.parse(tags, options)
    end
  else
    wrapper_doc = XML::Document.parse("<root>#{tags}</root>", nil, nil, options)
    self.errors = wrapper_doc.errors
    wrapper_doc.xpath("/root/node()")
  end
  children.each { |child| child.parent = self }
end

def name
  "#document-fragment"
end

def namespace_declarations(ctx)
  ctx.namespace_scopes.map do |namespace|
    prefix = namespace.prefix.nil? ? "" : ":#{namespace.prefix}"
    %{xmlns#{prefix}="#{namespace.href}"}
  end.join(" ")
end

def search(*rules)
  rules, handler, ns, binds = extract_params(rules)
  rules.inject(NodeSet.new(document)) do |set, rule|
    set + if Searchable::LOOKS_LIKE_XPATH.match?(rule)
      xpath(*[rule, ns, handler, binds].compact)
    else
      children.css(*[rule, ns, handler].compact) # 'children' is a smell here
    end
  end
end

def to_html(*args)
  if Nokogiri.jruby?
    options = args.first.is_a?(Hash) ? args.shift : {}
    unless options[:save_with]
      options[:save_with] = Node::SaveOptions::NO_DECLARATION | Node::SaveOptions::NO_EMPTY_TAGS | Node::SaveOptions::AS_HTML
    end
    args.insert(0, options)
  end
  children.to_html(*args)
end

def to_s
  children.to_s
end

def to_xhtml(*args)
  if Nokogiri.jruby?
    options = args.first.is_a?(Hash) ? args.shift : {}
    unless options[:save_with]
      options[:save_with] = Node::SaveOptions::NO_DECLARATION | Node::SaveOptions::NO_EMPTY_TAGS | Node::SaveOptions::AS_XHTML
    end
    args.insert(0, options)
  end
  children.to_xhtml(*args)
end

def to_xml(*args)
  children.to_xml(*args)
end