Haanga_Compiler::do_filtering PHP Method

    function do_filtering($name, $args)
    {
        static $filter;
        if (!$filter) {
            $filter = Haanga_Extension::getInstance('Filter');
        }
        if (is_array($name)) {
            /*
              prepare array for ($func_name, $arg1, $arg2 ... ) 
              where $arg1 = last expression and $arg2.. $argX is 
              defined in the template 
            */
            $args = array_merge($args, $name['args']);
            $name = $name[0];
        }
        if (!$filter->isValid($name)) {
            throw new Exception("{$name} is an invalid filter");
        }
        if ($filter->isSafe($name)) {
            /* check if the filter is return HTML-safe data (to avoid double scape) */
            $this->var_is_safe = TRUE;
        }
        if ($filter->hasGenerator($name)) {
            return $filter->generator($name, $this, $args);
        }
        $fnc = $filter->getFunctionAlias($name);
        if (!$fnc) {
            $fnc = $this->get_custom_filter($name);
        }
        $args = array_merge(array($fnc), $args);
        $exec = call_user_func_array('hexec', $args);
        return $exec;
    }