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<?php |
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declare(strict_types=1); |
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namespace Humbug\PhpScoper\Configuration; |
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use function array_pop; |
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use function count; |
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use function explode; |
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use function in_array; |
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use function preg_last_error; |
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use function preg_last_error_msg; |
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use function preg_match as native_preg_match; |
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use function Safe\sprintf; |
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use function str_split; |
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use function strlen; |
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final class RegexChecker |
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{ |
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// https://www.php.net/manual/en/reference.pcre.pattern.modifiers.php |
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private const PATTERN_MODIFIERS = [ |
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'i', |
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'm', |
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's', |
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'x', |
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'A', |
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'D', |
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'S', |
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'U', |
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'X', |
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'J', |
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'u', |
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]; |
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public function isRegexLike(string $value): bool |
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{ |
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$valueLength = strlen($value); |
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if ($valueLength < 2) { |
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return false; |
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} |
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$firstCharacter = $value[0]; |
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if (!self::isValidDelimiter($firstCharacter)) { |
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return false; |
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} |
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$parts = explode($firstCharacter, $value); |
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if (false === $parts || count($parts) !== 3) { |
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return false; |
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} |
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$lastPart = array_pop($parts); |
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if (!self::isValidRegexFlags($lastPart)) { |
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return false; |
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} |
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return true; |
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} |
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public function validateRegex(string $regex): ?string |
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{ |
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if (@native_preg_match($regex, '') !== false) { |
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return null; |
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} |
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return sprintf( |
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'Invalid regex: %s (code %s)', |
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preg_last_error_msg(), |
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preg_last_error(), |
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); |
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} |
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private static function isValidDelimiter(string $delimiter): bool |
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{ |
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// This is not ideal as not true but is good enough for our case. |
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// See https://github.com/humbug/php-scoper/issues/597 |
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return '\\' !== $delimiter && native_preg_match('/^\p{L}$/u', $delimiter) === 0; |
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} |
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private static function isValidRegexFlags(string $value): bool |
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{ |
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if ('' === $value) { |
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return true; |
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} |
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$characters = str_split($value); |
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foreach ($characters as $character) { |
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if (!in_array($character, self::PATTERN_MODIFIERS, true)) { |
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return false; |
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} |
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} |
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return true; |
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} |
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} |
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humbug /
php-scoper
