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| 1 | <?php |
| 2 | /** |
| 3 | * @package: pvc |
| 4 | * @author: Doug Wilbourne (dougwilbourne@gmail.com) |
| 5 | */ |
| 6 | |
| 7 | declare(strict_types = 1); |
| 8 | |
| 9 | namespace pvc\regex\filename; |
| 10 | |
| 11 | use pvc\regex\err\RegexInvalidDelimiterException; |
| 12 | use pvc\regex\Regex; |
| 13 | |
| 14 | /** |
| 15 | * Class RegexWindowsFilename |
| 16 | * |
| 17 | * Documentation for windows file names can be found at |
| 18 | * https://docs.microsoft.com/en-us/windows/desktop/FileIO/naming-a-file |
| 19 | */ |
| 20 | class RegexWindowsFilename extends Regex |
| 21 | { |
| 22 | public function __construct(bool $allowFileExtension = true) |
| 23 | { |
| 24 | /** |
| 25 | * illegal filenames are coded as a series of case-insensitive negative lookahead assertions |
| 26 | * first bracket each filename with begin / end of subject |
| 27 | */ |
| 28 | |
| 29 | $badFileNames = []; |
| 30 | foreach ($this->getIllegalFilenames() as $filename) { |
| 31 | $badFileNames[] = '^' . $filename . '$'; |
| 32 | } |
| 33 | |
| 34 | $pattern = ''; |
| 35 | $pattern .= '/^(?!(?i)(' . implode('|', $badFileNames) . '))'; |
| 36 | |
| 37 | // illegal characters are coded as a negative character class. |
| 38 | $pattern .= '[^' . $this->getIllegalChars($allowFileExtension) . ']*'; |
| 39 | |
| 40 | // assert end of subject / end of pattern |
| 41 | $pattern .= '$/'; |
| 42 | |
| 43 | $label = 'windows filename'; |
| 44 | |
| 45 | $this->setPattern($pattern); |
| 46 | $this->setLabel($label); |
| 47 | } |
| 48 | |
| 49 | /** |
| 50 | * getIllegalFilenames |
| 51 | * @return array<string> |
| 52 | */ |
| 53 | private function getIllegalFilenames(): array |
| 54 | { |
| 55 | $illegalFilenames = []; |
| 56 | $illegalFilenames[] = 'CON'; |
| 57 | $illegalFilenames[] = 'PRN'; |
| 58 | $illegalFilenames[] = 'AUX'; |
| 59 | $illegalFilenames[] = 'NUL'; |
| 60 | for ($i = 1; $i < 10; $i++) { |
| 61 | $illegalFilenames[] = 'COM' . $i; |
| 62 | $illegalFilenames[] = 'LPT' . $i; |
| 63 | } |
| 64 | return $illegalFilenames; |
| 65 | } |
| 66 | |
| 67 | /** |
| 68 | * getIllegalChars |
| 69 | * @param bool $allowFileExtension |
| 70 | * @return string |
| 71 | * @throws RegexInvalidDelimiterException |
| 72 | * @throws RegexInvalidDelimiterException |
| 73 | */ |
| 74 | // the following chars are illegal: < > : " \ / | ? * |
| 75 | private function getIllegalChars(bool $allowFileExtension): string |
| 76 | { |
| 77 | $result = '<>:"\/|?*'; |
| 78 | if (!$allowFileExtension) { |
| 79 | $result .= '.'; |
| 80 | } |
| 81 | return Regex::escapeString($result, '/'); |
| 82 | } |
| 83 | } |