public function getFilters() {
            return array( // Numbers
                'num_format'  => new \Twig_Filter_Function('num::format'),
                // Text
                'limit_words' => new \Twig_Filter_Function('Text::limit_words'),
                'limit_chars' => new \Twig_Filter_Function('Text::limit_chars'),
                'auto_link'   => new \Twig_Filter_Function('Text::auto_link'),
                'auto_p'      => new \Twig_Filter_Function('Text::auto_p'),
                'bytes'       => new \Twig_Filter_Function('Text::bytes'),
                'lower'       => new \Twig_Filter_Function('mb_strtolower'),
                'upper'       => new \Twig_Filter_Function('mb_strtoupper'),
                'ucfirst'     => new \Twig_Filter_Function('ucfirst'),
                'ucwords'     => new \Twig_Filter_Function('ucwords'),
                'strip_tags'  => new \Twig_Filter_Function('strip_tags'),
                'trim'        => new \Twig_Filter_Function('trim'),
                'int'         => new \Twig_Filter_Function('intval'),
                'xss_clean'   => new \Twig_Filter_Function('Security::xss_clean'),
                'urlencode'   => new \Twig_Filter_Function('urlencode'),
                'highlight'   => new \Twig_Filter_Function('\Meerkat\Twig\Twig_Extension::f_highlight'),
            );
        }