Haanga_Compiler::get_filtered_var PHP Method

    function get_filtered_var($variable, &$varname, $accept_string = NULL)
    {
        $this->var_is_safe = FALSE;
        if ($accept_string === NULL && is_array($variable[0]) && !Haanga_AST::is_exec($variable[0])) {
            $accept_string = !empty($variable[0]['string']) || $variable[0][0] === 'block';
        }
        if (count($variable) > 1) {
            $count = count($variable);
            if ($accept_string && isset($variable[0]['string'])) {
                $target = $variable[0];
            } else {
                if (Haanga_AST::is_exec($variable[0])) {
                    $target = $variable[0];
                } else {
                    $target = $this->generate_variable_name($variable[0]);
                }
            }
            if (!empty($variable[0][0]) && $variable[0][0] == 'block') {
                /* block.super can't have any filter */
                throw new Exception("This variable can't have any filter");
            }
            if (!empty($target['var']) && $this->isMethod($target['var'], $return)) {
                $target = $return;
            }
            for ($i = 1; $i < $count; $i++) {
                $func_name = $variable[$i];
                if ($func_name == 'escape') {
                    /* to avoid double cleaning */
                    $this->var_is_safe = TRUE;
                }
                $args = array(isset($exec) ? $exec : $target);
                $exec = $this->do_filtering($func_name, $args);
            }
            unset($variable);
            $varname = $args[0];
            $details = $exec;
        } else {
            if (Haanga_AST::is_exec($variable[0])) {
                return $variable[0];
            }
            $details = $this->generate_variable_name($variable[0]);
            $varname = $variable[0];
            if ($this->isMethod($varname, $return)) {
                return $return;
            }
            if (!Haanga_AST::is_var($details) && !$accept_string) {
                /* generate_variable_name didn't replied a variable, weird case
                       currently just used for {{block.super}}.
                   */
                throw new Exception("Invalid variable name {$variable[0]}");
            }
        }
        return $details;
    }