class Nokogiri::XML::Node

def parse(string_or_io, options = nil)
  ##
  # When the current node is unparented and not an element node, use the
  # document as the parsing context instead. Otherwise, the in-context
  # parser cannot find an element or a document node.
  # Document Fragments are also not usable by the in-context parser.
  if !element? && !document? && (!parent || parent.fragment?)
    return document.parse(string_or_io, options)
  end
  options ||= (document.html? ? ParseOptions::DEFAULT_HTML : ParseOptions::DEFAULT_XML)
  options = Nokogiri::XML::ParseOptions.new(options) if Integer === options
  yield options if block_given?
  contents = if string_or_io.respond_to?(:read)
    string_or_io.read
  else
    string_or_io
  end
  return Nokogiri::XML::NodeSet.new(document) if contents.empty?
  # libxml2 does not obey the +recover+ option after encountering errors during +in_context+
  # parsing, and so this horrible hack is here to try to emulate recovery behavior.
  #
  # Unfortunately, this means we're no longer parsing "in context" and so namespaces that
  # would have been inherited from the context node won't be handled correctly. This hack was
  # written in 2010, and I regret it, because it's silently degrading functionality in a way
  # that's not easily prevented (or even detected).
  #
  # I think preferable behavior would be to either:
  #
  # a. add an error noting that we "fell back" and pointing the user to turning off the +recover+ option
  # b. don't recover, but raise a sensible exception
  #
  # For context and background: https://github.com/sparklemotion/nokogiri/issues/313
  # FIXME bug report: https://github.com/sparklemotion/nokogiri/issues/2092
  error_count = document.errors.length
  node_set = in_context(contents, options.to_i)
  if node_set.empty? && (document.errors.length > error_count)
    if options.recover?
      fragment = document.related_class("DocumentFragment").parse(contents)
      node_set = fragment.children
    else
      raise document.errors[error_count]
    end
  end
  node_set
end