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<?php |
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declare(strict_types=1); |
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namespace Yokai\EnumBundle; |
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use ReflectionClass; |
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use ReflectionException; |
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use Yokai\EnumBundle\Exception\CannotExtractConstantsException; |
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/** |
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* @internal |
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* |
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* @author Yann Eugoné <[email protected]> |
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*/ |
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class ConstantExtractor |
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{ |
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public function extract(string $pattern): array |
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{ |
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[$class, $patternRegex] = $this->explode($pattern); |
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return $this->filter( |
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$this->publicConstants($class), |
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$patternRegex, |
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$pattern |
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); |
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} |
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private function filter(array $constants, string $regexp, string $pattern): array |
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{ |
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$matchingNames = preg_grep($regexp, array_keys($constants)); |
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if (count($matchingNames) === 0) { |
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throw CannotExtractConstantsException::noConstantMatchingPattern($pattern); |
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} |
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return array_values(array_intersect_key($constants, array_flip($matchingNames))); |
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} |
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private function publicConstants(string $class): array |
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{ |
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try { |
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$constants = (new ReflectionClass($class))->getReflectionConstants(); |
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} catch (ReflectionException $exception) { |
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throw CannotExtractConstantsException::classDoNotExists($class); |
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} |
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$list = []; |
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foreach ($constants as $constant) { |
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if (!$constant->isPublic()) { |
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continue; |
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} |
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$list[$constant->getName()] = $constant->getValue(); |
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} |
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if (count($list) === 0) { |
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throw CannotExtractConstantsException::classHasNoPublicConstant($class); |
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} |
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return $list; |
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} |
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private function explode(string $pattern): array |
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{ |
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if (substr_count($pattern, '::') !== 1) { |
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throw CannotExtractConstantsException::invalidPattern($pattern); |
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} |
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[$class, $constantsNamePattern] = explode('::', $pattern); |
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if (substr_count($constantsNamePattern, '*') === 0) { |
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throw CannotExtractConstantsException::invalidPattern($pattern); |
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} |
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$constantsNameRegexp = sprintf( |
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'#^%s$#', |
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str_replace('*', '[0-9a-zA-Z_]+', $constantsNamePattern) |
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); |
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return [$class, $constantsNameRegexp]; |
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} |
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} |
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yokai-php /
enum-bundle
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This check marks access to variables or properties that have not been declared yet. While PHP has no explicit notion of declaring a variable, accessing it before a value is assigned to it is most likely a bug.