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Chain.php (3851B)

      1 <?php
      2 
      3 /*
      4  * This file is part of Twig.
      5  *
      6  * (c) 2011 Fabien Potencier
      7  *
      8  * For the full copyright and license information, please view the LICENSE
      9  * file that was distributed with this source code.
     10  */
     11 
     12 /**
     13  * Loads templates from other loaders.
     14  *
     15  * @author Fabien Potencier <fabien@symfony.com>
     16  */
     17 class Twig_Loader_Chain implements Twig_LoaderInterface, Twig_ExistsLoaderInterface
     18 {
     19     private $hasSourceCache = array();
     20     protected $loaders = array();
     21 
     22     /**
     23      * Constructor.
     24      *
     25      * @param Twig_LoaderInterface[] $loaders An array of loader instances
     26      */
     27     public function __construct(array $loaders = array())
     28     {
     29         foreach ($loaders as $loader) {
     30             $this->addLoader($loader);
     31         }
     32     }
     33 
     34     /**
     35      * Adds a loader instance.
     36      *
     37      * @param Twig_LoaderInterface $loader A Loader instance
     38      */
     39     public function addLoader(Twig_LoaderInterface $loader)
     40     {
     41         $this->loaders[] = $loader;
     42         $this->hasSourceCache = array();
     43     }
     44 
     45     /**
     46      * {@inheritdoc}
     47      */
     48     public function getSource($name)
     49     {
     50         $exceptions = array();
     51         foreach ($this->loaders as $loader) {
     52             if ($loader instanceof Twig_ExistsLoaderInterface && !$loader->exists($name)) {
     53                 continue;
     54             }
     55 
     56             try {
     57                 return $loader->getSource($name);
     58             } catch (Twig_Error_Loader $e) {
     59                 $exceptions[] = $e->getMessage();
     60             }
     61         }
     62 
     63         throw new Twig_Error_Loader(sprintf('Template "%s" is not defined%s.', $name, $exceptions ? ' ('.implode(', ', $exceptions).')' : ''));
     64     }
     65 
     66     /**
     67      * {@inheritdoc}
     68      */
     69     public function exists($name)
     70     {
     71         $name = (string) $name;
     72 
     73         if (isset($this->hasSourceCache[$name])) {
     74             return $this->hasSourceCache[$name];
     75         }
     76 
     77         foreach ($this->loaders as $loader) {
     78             if ($loader instanceof Twig_ExistsLoaderInterface) {
     79                 if ($loader->exists($name)) {
     80                     return $this->hasSourceCache[$name] = true;
     81                 }
     82 
     83                 continue;
     84             }
     85 
     86             try {
     87                 $loader->getSource($name);
     88 
     89                 return $this->hasSourceCache[$name] = true;
     90             } catch (Twig_Error_Loader $e) {
     91             }
     92         }
     93 
     94         return $this->hasSourceCache[$name] = false;
     95     }
     96 
     97     /**
     98      * {@inheritdoc}
     99      */
    100     public function getCacheKey($name)
    101     {
    102         $exceptions = array();
    103         foreach ($this->loaders as $loader) {
    104             if ($loader instanceof Twig_ExistsLoaderInterface && !$loader->exists($name)) {
    105                 continue;
    106             }
    107 
    108             try {
    109                 return $loader->getCacheKey($name);
    110             } catch (Twig_Error_Loader $e) {
    111                 $exceptions[] = get_class($loader).': '.$e->getMessage();
    112             }
    113         }
    114 
    115         throw new Twig_Error_Loader(sprintf('Template "%s" is not defined%s.', $name, $exceptions ? ' ('.implode(', ', $exceptions).')' : ''));
    116     }
    117 
    118     /**
    119      * {@inheritdoc}
    120      */
    121     public function isFresh($name, $time)
    122     {
    123         $exceptions = array();
    124         foreach ($this->loaders as $loader) {
    125             if ($loader instanceof Twig_ExistsLoaderInterface && !$loader->exists($name)) {
    126                 continue;
    127             }
    128 
    129             try {
    130                 return $loader->isFresh($name, $time);
    131             } catch (Twig_Error_Loader $e) {
    132                 $exceptions[] = get_class($loader).': '.$e->getMessage();
    133             }
    134         }
    135 
    136         throw new Twig_Error_Loader(sprintf('Template "%s" is not defined%s.', $name, $exceptions ? ' ('.implode(', ', $exceptions).')' : ''));
    137     }
    138 }