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web/vendor/symfony/routing/Loader/AnnotationFileLoader.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\Component\Routing\Loader;
+
+use Symfony\Component\Routing\RouteCollection;
+use Symfony\Component\Config\Resource\FileResource;
+use Symfony\Component\Config\Loader\FileLoader;
+use Symfony\Component\Config\FileLocatorInterface;
+
+/**
+ * AnnotationFileLoader loads routing information from annotations set
+ * on a PHP class and its methods.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class AnnotationFileLoader extends FileLoader
+{
+    protected $loader;
+
+    /**
+     * Constructor.
+     *
+     * @param FileLocatorInterface  $locator A FileLocator instance
+     * @param AnnotationClassLoader $loader  An AnnotationClassLoader instance
+     *
+     * @throws \RuntimeException
+     */
+    public function __construct(FileLocatorInterface $locator, AnnotationClassLoader $loader)
+    {
+        if (!function_exists('token_get_all')) {
+            throw new \RuntimeException('The Tokenizer extension is required for the routing annotation loaders.');
+        }
+
+        parent::__construct($locator);
+
+        $this->loader = $loader;
+    }
+
+    /**
+     * Loads from annotations from a file.
+     *
+     * @param string      $file A PHP file path
+     * @param string|null $type The resource type
+     *
+     * @return RouteCollection A RouteCollection instance
+     *
+     * @throws \InvalidArgumentException When the file does not exist or its routes cannot be parsed
+     */
+    public function load($file, $type = null)
+    {
+        $path = $this->locator->locate($file);
+
+        $collection = new RouteCollection();
+        if ($class = $this->findClass($path)) {
+            $collection->addResource(new FileResource($path));
+            $collection->addCollection($this->loader->load($class, $type));
+        }
+        if (PHP_VERSION_ID >= 70000) {
+            // PHP 7 memory manager will not release after token_get_all(), see https://bugs.php.net/70098
+            gc_mem_caches();
+        }
+
+        return $collection;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function supports($resource, $type = null)
+    {
+        return is_string($resource) && 'php' === pathinfo($resource, PATHINFO_EXTENSION) && (!$type || 'annotation' === $type);
+    }
+
+    /**
+     * Returns the full class name for the first class in the file.
+     *
+     * @param string $file A PHP file path
+     *
+     * @return string|false Full class name if found, false otherwise
+     */
+    protected function findClass($file)
+    {
+        $class = false;
+        $namespace = false;
+        $tokens = token_get_all(file_get_contents($file));
+        for ($i = 0; isset($tokens[$i]); ++$i) {
+            $token = $tokens[$i];
+
+            if (!isset($token[1])) {
+                continue;
+            }
+
+            if (true === $class && T_STRING === $token[0]) {
+                return $namespace.'\\'.$token[1];
+            }
+
+            if (true === $namespace && T_STRING === $token[0]) {
+                $namespace = $token[1];
+                while (isset($tokens[++$i][1]) && in_array($tokens[$i][0], array(T_NS_SEPARATOR, T_STRING))) {
+                    $namespace .= $tokens[$i][1];
+                }
+                $token = $tokens[$i];
+            }
+
+            if (T_CLASS === $token[0]) {
+                // Skip usage of ::class constant
+                $isClassConstant = false;
+                for ($j = $i - 1; $j > 0; --$j) {
+                    if (!isset($tokens[$j][1])) {
+                        break;
+                    }
+
+                    if (T_DOUBLE_COLON === $tokens[$j][0]) {
+                        $isClassConstant = true;
+                        break;
+                    } elseif (!in_array($tokens[$j][0], array(T_WHITESPACE, T_DOC_COMMENT, T_COMMENT))) {
+                        break;
+                    }
+                }
+
+                if (!$isClassConstant) {
+                    $class = true;
+                }
+            }
+
+            if (T_NAMESPACE === $token[0]) {
+                $namespace = true;
+            }
+        }
+
+        return false;
+    }
+}