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vendor/symfony/twig-bundle/CacheWarmer/TemplateCacheCacheWarmer.php

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+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Bundle\TwigBundle\CacheWarmer;
+
+use Symfony\Component\Finder\Finder;
+use Symfony\Component\HttpKernel\CacheWarmer\CacheWarmerInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+use Symfony\Bundle\FrameworkBundle\CacheWarmer\TemplateFinderInterface;
+use Symfony\Component\Templating\TemplateReference;
+use Twig\Error\Error;
+
+/**
+ * Generates the Twig cache for all templates.
+ *
+ * This warmer must be registered after TemplatePathsCacheWarmer,
+ * as the Twig loader will need the cache generated by it.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class TemplateCacheCacheWarmer implements CacheWarmerInterface
+{
+    protected $container;
+    protected $finder;
+    private $paths;
+
+    /**
+     * Constructor.
+     *
+     * @param ContainerInterface      $container The dependency injection container
+     * @param TemplateFinderInterface $finder    The template paths cache warmer
+     * @param array                   $paths     Additional twig paths to warm
+     */
+    public function __construct(ContainerInterface $container, TemplateFinderInterface $finder = null, array $paths = array())
+    {
+        // We don't inject the Twig environment directly as it depends on the
+        // template locator (via the loader) which might be a cached one.
+        // The cached template locator is available once the TemplatePathsCacheWarmer
+        // has been warmed up.
+        // But it can also be null if templating has been disabled.
+        $this->container = $container;
+        $this->finder = $finder;
+        $this->paths = $paths;
+    }
+
+    /**
+     * Warms up the cache.
+     *
+     * @param string $cacheDir The cache directory
+     */
+    public function warmUp($cacheDir)
+    {
+        if (null === $this->finder) {
+            return;
+        }
+
+        $twig = $this->container->get('twig');
+
+        $templates = $this->finder->findAllTemplates();
+
+        foreach ($this->paths as $path => $namespace) {
+            $templates = array_merge($templates, $this->findTemplatesInFolder($namespace, $path));
+        }
+
+        foreach ($templates as $template) {
+            if ('twig' !== $template->get('engine')) {
+                continue;
+            }
+
+            try {
+                $twig->loadTemplate($template);
+            } catch (Error $e) {
+                // problem during compilation, give up
+            }
+        }
+    }
+
+    /**
+     * Checks whether this warmer is optional or not.
+     *
+     * @return bool always true
+     */
+    public function isOptional()
+    {
+        return true;
+    }
+
+    /**
+     * Find templates in the given directory.
+     *
+     * @param string $namespace The namespace for these templates
+     * @param string $dir       The folder where to look for templates
+     *
+     * @return array An array of templates of type TemplateReferenceInterface
+     */
+    private function findTemplatesInFolder($namespace, $dir)
+    {
+        if (!is_dir($dir)) {
+            return array();
+        }
+
+        $templates = array();
+        $finder = new Finder();
+
+        foreach ($finder->files()->followLinks()->in($dir) as $file) {
+            $name = $file->getRelativePathname();
+            $templates[] = new TemplateReference(
+                $namespace ? sprintf('@%s/%s', $namespace, $name) : $name,
+                'twig'
+            );
+        }
+
+        return $templates;
+    }
+}

vendor/symfony/twig-bundle/CacheWarmer/TemplateCacheWarmer.php

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+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Bundle\TwigBundle\CacheWarmer;
+
+use Symfony\Component\DependencyInjection\ContainerInterface;
+use Symfony\Component\HttpKernel\CacheWarmer\CacheWarmerInterface;
+use Twig\Environment;
+use Twig\Error\Error;
+
+/**
+ * Generates the Twig cache for all templates.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class TemplateCacheWarmer implements CacheWarmerInterface
+{
+    private $container;
+    private $twig;
+    private $iterator;
+
+    /**
+     * TemplateCacheWarmer constructor.
+     *
+     * @param ContainerInterface|Environment $container
+     * @param \Traversable                   $iterator
+     */
+    public function __construct($container, \Traversable $iterator)
+    {
+        // As this cache warmer is optional, dependencies should be lazy-loaded, that's why a container should be injected.
+        if ($container instanceof ContainerInterface) {
+            $this->container = $container;
+        } elseif ($container instanceof Environment) {
+            $this->twig = $container;
+        } else {
+            throw new \InvalidArgumentException(sprintf('%s only accepts instance of Symfony\Component\DependencyInjection\ContainerInterface or Environment as first argument.', __CLASS__));
+        }
+
+        $this->iterator = $iterator;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function warmUp($cacheDir)
+    {
+        if (null === $this->twig) {
+            $this->twig = $this->container->get('twig');
+        }
+
+        foreach ($this->iterator as $template) {
+            try {
+                $this->twig->loadTemplate($template);
+            } catch (Error $e) {
+                // problem during compilation, give up
+                // might be a syntax error or a non-Twig template
+            }
+        }
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function isOptional()
+    {
+        return true;
+    }
+}