public function getFilterContainer()
{
if ($this->_filterContainer === null) {
$filterContainer = new FilterContainer();
$filterContainer->addFilter(new CssFilter());
$filterContainer->addFilter(new PlainFilter());
$filterContainer->addFilter(new JavascriptFilter());
$filterContainer->addFilter(new PhpFilter());
$filterContainer->addFilter(new MarkdownFilter());
$filterContainer->addFilter(new MarkdownExtraFilter());
$this->_filterContainer = $filterContainer;
}
return $this->_filterContainer;
}