* @author Kornel Lesiński
* @license http://www.gnu.org/licenses/lgpl.html GNU Lesser General Public License
* @version SVN: $Id: TalesRegistry.php 610 2009-05-24 00:32:13Z kornel $
* @link http://phptal.org/
*/
/**
* Global registry of TALES expression modifiers
*
* @package PHPTAL
* @subpackage Php
*/
class PHPTAL_TalesRegistry
{
private static $instance;
/**
* This is a singleton
*
* @return PHPTAL_TalesRegistry
*/
static public function getInstance()
{
if (!self::$instance) {
self::$instance = new PHPTAL_TalesRegistry();
}
return self::$instance;
}
protected function __construct()
{
$this->registerPrefix('not', array('PHPTAL_Php_TalesInternal', 'not'));
$this->registerPrefix('path', array('PHPTAL_Php_TalesInternal', 'path'));
$this->registerPrefix('string', array('PHPTAL_Php_TalesInternal', 'string'));
$this->registerPrefix('php', array('PHPTAL_Php_TalesInternal', 'php'));
$this->registerPrefix('exists', array('PHPTAL_Php_TalesInternal', 'exists'));
$this->registerPrefix('number', array('PHPTAL_Php_TalesInternal', 'number'));
$this->registerPrefix('true', array('PHPTAL_Php_TalesInternal', 'true'));
}
/**
*
* Expects an either a function name or an array of class and method as
* callback.
*
* @param string $prefix
* @param mixed $callback
*/
public function registerPrefix($prefix, $callback)
{
if ($this->isRegistered($prefix)) {
throw new PHPTAL_ConfigurationException("Expression modifier '$prefix' is already registered");
}
// Check if valid callback
if (is_array($callback)) {
$class = new ReflectionClass($callback[0]);
if (!$class->isSubclassOf('PHPTAL_Tales')) {
throw new PHPTAL_ConfigurationException('The class you want to register does not implement "PHPTAL_Tales".');
}
$method = new ReflectionMethod($callback[0], $callback[1]);
if (!$method->isStatic()) {
throw new PHPTAL_ConfigurationException('The method you want to register is not static.');
}
// maybe we want to check the parameters the method takes
} else {
if (!function_exists($callback)) {
throw new PHPTAL_ConfigurationException('The function you are trying to register does not exist.');
}
}
$this->_callbacks[$prefix] = $callback;
}
/**
* true if given prefix is taken
*/
public function isRegistered($prefix)
{
return (array_key_exists($prefix, $this->_callbacks));
}
/**
* get callback for the prefix
*/
public function getCallback($prefix)
{
if (!$this->isRegistered($prefix)) {
throw new PHPTAL_ConfigurationException("Expression modifier '$prefix' is not registered");
}
return $this->_callbacks[$prefix];
}
private $_callbacks = array();
}