XMLResultParser

xml_result_parser.rb

class XMLResultParser
  class << self
    delegate :parse_xml, :xml_result?, to: :new
  end

  def parse_xml(result)
    parsed_result = parse_result(result)

    if xml_result?(result)
      result
    elsif xml_result?(parsed_result)
      parsed_result
    else
      result
    end
  end

  def xml_result?(result)
    xml = Nokogiri::XML(result)

    xml.errors.empty? && xml.root.present?
  end

  private

  def parse_result(result)
    string = String(result)
    string = unescape_unicode_escape_sequences(string)
    string = remove_line_breaks(string)
    string = remove_backlashes(string)
    string = remove_whitespace(string)
    string
  end

  # https://stackoverflow.com/a/7017226
  def unescape_unicode_escape_sequences(string)
    string.gsub(/\\u([\da-fA-F]{4})/) { [$1].pack('H*').unpack('n*').pack('U*') }
  end

  def remove_line_breaks(string)
    string.gsub(/\\n/, '')
  end

  def remove_backlashes(string)
    string.delete('\\')
  end

  # https://stackoverflow.com/questions/65025151/remove-whitespace-from-xml-document-using-ruby#comment114961832_65025151
  def remove_whitespace(string)
    string.split.join(' ').gsub('> <', '><')
  end
end