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1 <?php
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2
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3 /*
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4 * This file is part of the Symfony package.
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5 *
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6 * (c) Fabien Potencier <fabien@symfony.com>
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7 *
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8 * For the full copyright and license information, please view the LICENSE
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9 * file that was distributed with this source code.
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10 */
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11
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12 namespace Symfony\Component\Translation\Extractor;
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13
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14 use Symfony\Component\Translation\Exception\InvalidArgumentException;
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15
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16 /**
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17 * Base class used by classes that extract translation messages from files.
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18 *
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19 * @author Marcos D. Sánchez <marcosdsanchez@gmail.com>
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20 */
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21 abstract class AbstractFileExtractor
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22 {
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23 /**
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24 * @param string|array $resource Files, a file or a directory
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25 *
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26 * @return array
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27 */
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28 protected function extractFiles($resource)
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29 {
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30 if (\is_array($resource) || $resource instanceof \Traversable) {
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31 $files = [];
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32 foreach ($resource as $file) {
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33 if ($this->canBeExtracted($file)) {
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34 $files[] = $this->toSplFileInfo($file);
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35 }
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36 }
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37 } elseif (is_file($resource)) {
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38 $files = $this->canBeExtracted($resource) ? [$this->toSplFileInfo($resource)] : [];
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39 } else {
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40 $files = $this->extractFromDirectory($resource);
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41 }
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42
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43 return $files;
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44 }
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45
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46 /**
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47 * @param string $file
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48 *
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49 * @return \SplFileInfo
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50 */
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51 private function toSplFileInfo($file)
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52 {
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53 return ($file instanceof \SplFileInfo) ? $file : new \SplFileInfo($file);
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54 }
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55
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56 /**
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57 * @param string $file
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58 *
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59 * @return bool
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60 *
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61 * @throws InvalidArgumentException
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62 */
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63 protected function isFile($file)
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64 {
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65 if (!is_file($file)) {
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66 throw new InvalidArgumentException(sprintf('The "%s" file does not exist.', $file));
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67 }
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68
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69 return true;
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70 }
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71
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72 /**
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73 * @param string $file
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74 *
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75 * @return bool
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76 */
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77 abstract protected function canBeExtracted($file);
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78
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79 /**
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80 * @param string|array $resource Files, a file or a directory
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81 *
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82 * @return array files to be extracted
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83 */
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84 abstract protected function extractFromDirectory($resource);
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85 }
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