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FileLoader.php
001 <?php
002
003 /*
004 * This file is part of the Symfony package.
005 *
006 * (c) Fabien Potencier <fabien@symfony.com>
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 Symfony\Component\Config\Loader;
013
014 use Symfony\Component\Config\Exception\FileLoaderImportCircularReferenceException;
015 use Symfony\Component\Config\Exception\FileLoaderLoadException;
016 use Symfony\Component\Config\Exception\FileLocatorFileNotFoundException;
017 use Symfony\Component\Config\FileLocatorInterface;
018 use Symfony\Component\Config\Resource\FileExistenceResource;
019 use Symfony\Component\Config\Resource\GlobResource;
020
021 /**
022 * FileLoader is the abstract class used by all built-in loaders that are file based.
023 *
024 * @author Fabien Potencier <fabien@symfony.com>
025 */
026 abstract class FileLoader extends Loader
027 {
028 protected static $loading = [];
029
030 protected $locator;
031
032 private $currentDir;
033
034 public function __construct(FileLocatorInterface $locator)
035 {
036 $this->locator = $locator;
037 }
038
039 /**
040 * Sets the current directory.
041 *
042 * @param string $dir
043 */
044 public function setCurrentDir($dir)
045 {
046 $this->currentDir = $dir;
047 }
048
049 /**
050 * Returns the file locator used by this loader.
051 *
052 * @return FileLocatorInterface
053 */
054 public function getLocator()
055 {
056 return $this->locator;
057 }
058
059 /**
060 * Imports a resource.
061 *
062 * @param mixed $resource A Resource
063 * @param string|null $type The resource type or null if unknown
064 * @param bool $ignoreErrors Whether to ignore import errors or not
065 * @param string|null $sourceResource The original resource importing the new resource
066 *
067 * @return mixed
068 *
069 * @throws FileLoaderLoadException
070 * @throws FileLoaderImportCircularReferenceException
071 * @throws FileLocatorFileNotFoundException
072 */
073 public function import($resource, $type = null, $ignoreErrors = false, $sourceResource = null)
074 {
075 if (\is_string($resource) && \strlen($resource) !== $i = strcspn($resource, '*?{[')) {
076 $ret = [];
077 $isSubpath = 0 !== $i && false !== strpos(substr($resource, 0, $i), '/');
078 foreach ($this->glob($resource, false, $_, $ignoreErrors || !$isSubpath) as $path => $info) {
079 if (null !== $res = $this->doImport($path, 'glob' === $type ? null : $type, $ignoreErrors, $sourceResource)) {
080 $ret[] = $res;
081 }
082 $isSubpath = true;
083 }
084
085 if ($isSubpath) {
086 return isset($ret[1]) ? $ret : (isset($ret[0]) ? $ret[0] : null);
087 }
088 }
089
090 return $this->doImport($resource, $type, $ignoreErrors, $sourceResource);
091 }
092
093 /**
094 * @internal
095 */
096 protected function glob($pattern, $recursive, &$resource = null, $ignoreErrors = false)
097 {
098 if (\strlen($pattern) === $i = strcspn($pattern, '*?{[')) {
099 $prefix = $pattern;
100 $pattern = '';
101 } elseif (0 === $i || false === strpos(substr($pattern, 0, $i), '/')) {
102 $prefix = '.';
103 $pattern = '/'.$pattern;
104 } else {
105 $prefix = \dirname(substr($pattern, 0, 1 + $i));
106 $pattern = substr($pattern, \strlen($prefix));
107 }
108
109 try {
110 $prefix = $this->locator->locate($prefix, $this->currentDir, true);
111 } catch (FileLocatorFileNotFoundException $e) {
112 if (!$ignoreErrors) {
113 throw $e;
114 }
115
116 $resource = [];
117 foreach ($e->getPaths() as $path) {
118 $resource[] = new FileExistenceResource($path);
119 }
120
121 return;
122 }
123 $resource = new GlobResource($prefix, $pattern, $recursive);
124
125 foreach ($resource as $path => $info) {
126 yield $path => $info;
127 }
128 }
129
130 private function doImport($resource, $type = null, $ignoreErrors = false, $sourceResource = null)
131 {
132 try {
133 $loader = $this->resolve($resource, $type);
134
135 if ($loader instanceof self && null !== $this->currentDir) {
136 $resource = $loader->getLocator()->locate($resource, $this->currentDir, false);
137 }
138
139 $resources = \is_array($resource) ? $resource : [$resource];
140 for ($i = 0; $i < $resourcesCount = \count($resources); ++$i) {
141 if (isset(self::$loading[$resources[$i]])) {
142 if ($i == $resourcesCount - 1) {
143 throw new FileLoaderImportCircularReferenceException(array_keys(self::$loading));
144 }
145 } else {
146 $resource = $resources[$i];
147 break;
148 }
149 }
150 self::$loading[$resource] = true;
151
152 try {
153 $ret = $loader->load($resource, $type);
154 } finally {
155 unset(self::$loading[$resource]);
156 }
157
158 return $ret;
159 } catch (FileLoaderImportCircularReferenceException $e) {
160 throw $e;
161 } catch (\Exception $e) {
162 if (!$ignoreErrors) {
163 // prevent embedded imports from nesting multiple exceptions
164 if ($e instanceof FileLoaderLoadException) {
165 throw $e;
166 }
167
168 throw new FileLoaderLoadException($resource, $sourceResource, null, $e, $type);
169 }
170 }
171
172 return null;
173 }
174 }
175