--- /dev/null
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Loads templates from other loaders.
+ *
+ * @final
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Loader_Chain implements Twig_LoaderInterface, Twig_ExistsLoaderInterface, Twig_SourceContextLoaderInterface
+{
+ private $hasSourceCache = array();
+ protected $loaders = array();
+
+ /**
+ * @param Twig_LoaderInterface[] $loaders
+ */
+ public function __construct(array $loaders = array())
+ {
+ foreach ($loaders as $loader) {
+ $this->addLoader($loader);
+ }
+ }
+
+ public function addLoader(Twig_LoaderInterface $loader)
+ {
+ $this->loaders[] = $loader;
+ $this->hasSourceCache = array();
+ }
+
+ public function getSource($name)
+ {
+ @trigger_error(sprintf('Calling "getSource" on "%s" is deprecated since 1.27. Use getSourceContext() instead.', get_class($this)), E_USER_DEPRECATED);
+
+ $exceptions = array();
+ foreach ($this->loaders as $loader) {
+ if ($loader instanceof Twig_ExistsLoaderInterface && !$loader->exists($name)) {
+ continue;
+ }
+
+ try {
+ return $loader->getSource($name);
+ } catch (Twig_Error_Loader $e) {
+ $exceptions[] = $e->getMessage();
+ }
+ }
+
+ throw new Twig_Error_Loader(sprintf('Template "%s" is not defined%s.', $name, $exceptions ? ' ('.implode(', ', $exceptions).')' : ''));
+ }
+
+ public function getSourceContext($name)
+ {
+ $exceptions = array();
+ foreach ($this->loaders as $loader) {
+ if ($loader instanceof Twig_ExistsLoaderInterface && !$loader->exists($name)) {
+ continue;
+ }
+
+ try {
+ if ($loader instanceof Twig_SourceContextLoaderInterface) {
+ return $loader->getSourceContext($name);
+ }
+
+ return new Twig_Source($loader->getSource($name), $name);
+ } catch (Twig_Error_Loader $e) {
+ $exceptions[] = $e->getMessage();
+ }
+ }
+
+ throw new Twig_Error_Loader(sprintf('Template "%s" is not defined%s.', $name, $exceptions ? ' ('.implode(', ', $exceptions).')' : ''));
+ }
+
+ public function exists($name)
+ {
+ $name = (string) $name;
+
+ if (isset($this->hasSourceCache[$name])) {
+ return $this->hasSourceCache[$name];
+ }
+
+ foreach ($this->loaders as $loader) {
+ if ($loader instanceof Twig_ExistsLoaderInterface) {
+ if ($loader->exists($name)) {
+ return $this->hasSourceCache[$name] = true;
+ }
+
+ continue;
+ }
+
+ try {
+ if ($loader instanceof Twig_SourceContextLoaderInterface) {
+ $loader->getSourceContext($name);
+ } else {
+ $loader->getSource($name);
+ }
+
+ return $this->hasSourceCache[$name] = true;
+ } catch (Twig_Error_Loader $e) {
+ }
+ }
+
+ return $this->hasSourceCache[$name] = false;
+ }
+
+ public function getCacheKey($name)
+ {
+ $exceptions = array();
+ foreach ($this->loaders as $loader) {
+ if ($loader instanceof Twig_ExistsLoaderInterface && !$loader->exists($name)) {
+ continue;
+ }
+
+ try {
+ return $loader->getCacheKey($name);
+ } catch (Twig_Error_Loader $e) {
+ $exceptions[] = get_class($loader).': '.$e->getMessage();
+ }
+ }
+
+ throw new Twig_Error_Loader(sprintf('Template "%s" is not defined%s.', $name, $exceptions ? ' ('.implode(', ', $exceptions).')' : ''));
+ }
+
+ public function isFresh($name, $time)
+ {
+ $exceptions = array();
+ foreach ($this->loaders as $loader) {
+ if ($loader instanceof Twig_ExistsLoaderInterface && !$loader->exists($name)) {
+ continue;
+ }
+
+ try {
+ return $loader->isFresh($name, $time);
+ } catch (Twig_Error_Loader $e) {
+ $exceptions[] = get_class($loader).': '.$e->getMessage();
+ }
+ }
+
+ throw new Twig_Error_Loader(sprintf('Template "%s" is not defined%s.', $name, $exceptions ? ' ('.implode(', ', $exceptions).')' : ''));
+ }
+}