wpgd.templating.php

<?php /* -*- Mode: php; c-basic-offset:4; -*- */
/* Copyright (C) 2011  Lincoln de Sousa <lincoln@comum.org>
 * Copyright (C) 2011  Governo do Estado do Rio Grande do Sul
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

require_once 'Twig/Autoloader.php';
Twig_Autoloader::register();

/**
 * Call a PHP function from a twig template
 */
class Twig_Extension_exec extends Twig_Extension
{
     public function __construct() {
     }

     public function getFunctions() {
         return array(
             'exec' => new Twig_Function_Method($this, 'exec')
         );
     }

     public function exec () {
         $args = func_get_args();
         $name = array_shift($args);
         if (function_exists($name)) {
             return call_user_func_array($name, $args);
         }
     }

     public function getName() {
         return 'exec';
     }

}


/**
 * A template renderer engine based on the `twig' library.
 */
class WpGdTemplatingRenderer {
    private $twig = null;

    function __construct() {
        $path = join('/', array(dirname(__FILE__), 'templates'));
        $loader = new Twig_Loader_Filesystem($path);
        $this->twig =
            new Twig_Environment($loader, array('charset' => 'iso-8859-1'));
        $this->twig->addExtension(new Twig_Extension_exec);
    }

    public function render($templateName, $context=array()) {
        $template = $this->twig->loadTemplate($templateName);
        return $template->render($context);
    }
}