code: protected function getParser()
      {
          if ($this->parser) {
              return $this->parser;
          }
          foreach (SimpleTest::getParsers() as $parser) {
              if ($parser->can()) {
                  return $parser;
              }
          }
      }
docs: Get the HTML parser to use. Can be overridden by setParser.
  Otherwise scans through the available parsers and uses the first one which is available.
  
  @return object SimplePHPPageBuilder or SimpleTidyPageBuilder