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- Veröffentlicht
- 27.04.2026
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ChainLoader.php
001 <?php
002
003 /*
004 * This file is part of Twig.
005 *
006 * (c) Fabien Potencier
007 *
008 * For the full copyright and license information, please view the LICENSE
009 * file that was distributed with this source code.
010 */
011
012 namespace Twig\Loader;
013
014 use Twig\Error\LoaderError;
015
016 /**
017 * Loads templates from other loaders.
018 *
019 * @author Fabien Potencier <fabien@symfony.com>
020 */
021 final class ChainLoader implements LoaderInterface, ExistsLoaderInterface, SourceContextLoaderInterface
022 {
023 private $hasSourceCache = [];
024 private $loaders = [];
025
026 /**
027 * @param LoaderInterface[] $loaders
028 */
029 public function __construct(array $loaders = [])
030 {
031 foreach ($loaders as $loader) {
032 $this->addLoader($loader);
033 }
034 }
035
036 public function addLoader(LoaderInterface $loader)
037 {
038 $this->loaders[] = $loader;
039 $this->hasSourceCache = [];
040 }
041
042 /**
043 * @return LoaderInterface[]
044 */
045 public function getLoaders()
046 {
047 return $this->loaders;
048 }
049
050 public function getSourceContext($name)
051 {
052 $exceptions = [];
053 foreach ($this->loaders as $loader) {
054 if (!$loader->exists($name)) {
055 continue;
056 }
057
058 try {
059 return $loader->getSourceContext($name);
060 } catch (LoaderError $e) {
061 $exceptions[] = $e->getMessage();
062 }
063 }
064
065 throw new LoaderError(sprintf('Template "%s" is not defined%s.', $name, $exceptions ? ' ('.implode(', ', $exceptions).')' : ''));
066 }
067
068 public function exists($name)
069 {
070 if (isset($this->hasSourceCache[$name])) {
071 return $this->hasSourceCache[$name];
072 }
073
074 foreach ($this->loaders as $loader) {
075 if ($loader->exists($name)) {
076 return $this->hasSourceCache[$name] = true;
077 }
078 }
079
080 return $this->hasSourceCache[$name] = false;
081 }
082
083 public function getCacheKey($name)
084 {
085 $exceptions = [];
086 foreach ($this->loaders as $loader) {
087 if (!$loader->exists($name)) {
088 continue;
089 }
090
091 try {
092 return $loader->getCacheKey($name);
093 } catch (LoaderError $e) {
094 $exceptions[] = \get_class($loader).': '.$e->getMessage();
095 }
096 }
097
098 throw new LoaderError(sprintf('Template "%s" is not defined%s.', $name, $exceptions ? ' ('.implode(', ', $exceptions).')' : ''));
099 }
100
101 public function isFresh($name, $time)
102 {
103 $exceptions = [];
104 foreach ($this->loaders as $loader) {
105 if (!$loader->exists($name)) {
106 continue;
107 }
108
109 try {
110 return $loader->isFresh($name, $time);
111 } catch (LoaderError $e) {
112 $exceptions[] = \get_class($loader).': '.$e->getMessage();
113 }
114 }
115
116 throw new LoaderError(sprintf('Template "%s" is not defined%s.', $name, $exceptions ? ' ('.implode(', ', $exceptions).')' : ''));
117 }
118 }
119
120 class_alias('Twig\Loader\ChainLoader', 'Twig_Loader_Chain');
121