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ariadna |
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<?php declare(strict_types = 1);
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namespace Composer\Pcre\PHPStan;
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use Composer\Pcre\Preg;
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use Composer\Pcre\Regex;
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use Composer\Pcre\PcreException;
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use Nette\Utils\RegexpException;
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use Nette\Utils\Strings;
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use PhpParser\Node;
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use PhpParser\Node\Expr\StaticCall;
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use PhpParser\Node\Name\FullyQualified;
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use PHPStan\Analyser\Scope;
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use PHPStan\Rules\Rule;
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use PHPStan\Rules\RuleErrorBuilder;
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use function in_array;
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use function sprintf;
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/**
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* Copy of PHPStan's RegularExpressionPatternRule
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*
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* @implements Rule<StaticCall>
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*/
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class InvalidRegexPatternRule implements Rule
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{
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public function getNodeType(): string
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{
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return StaticCall::class;
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}
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public function processNode(Node $node, Scope $scope): array
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{
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$patterns = $this->extractPatterns($node, $scope);
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$errors = [];
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foreach ($patterns as $pattern) {
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$errorMessage = $this->validatePattern($pattern);
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if ($errorMessage === null) {
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continue;
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}
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$errors[] = RuleErrorBuilder::message(sprintf('Regex pattern is invalid: %s', $errorMessage))->identifier('regexp.pattern')->build();
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}
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return $errors;
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}
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/**
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* @return string[]
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*/
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private function extractPatterns(StaticCall $node, Scope $scope): array
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{
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if (!$node->class instanceof FullyQualified) {
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return [];
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}
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$isRegex = $node->class->toString() === Regex::class;
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$isPreg = $node->class->toString() === Preg::class;
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if (!$isRegex && !$isPreg) {
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return [];
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}
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if (!$node->name instanceof Node\Identifier || !Preg::isMatch('{^(match|isMatch|grep|replace|split)}', $node->name->name)) {
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return [];
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}
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$functionName = $node->name->name;
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if (!isset($node->getArgs()[0])) {
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return [];
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}
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$patternNode = $node->getArgs()[0]->value;
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$patternType = $scope->getType($patternNode);
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$patternStrings = [];
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foreach ($patternType->getConstantStrings() as $constantStringType) {
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if ($functionName === 'replaceCallbackArray') {
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continue;
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}
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$patternStrings[] = $constantStringType->getValue();
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}
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foreach ($patternType->getConstantArrays() as $constantArrayType) {
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if (
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in_array($functionName, [
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'replace',
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'replaceCallback',
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], true)
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) {
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foreach ($constantArrayType->getValueTypes() as $arrayKeyType) {
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foreach ($arrayKeyType->getConstantStrings() as $constantString) {
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$patternStrings[] = $constantString->getValue();
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}
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}
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}
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if ($functionName !== 'replaceCallbackArray') {
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continue;
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}
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foreach ($constantArrayType->getKeyTypes() as $arrayKeyType) {
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foreach ($arrayKeyType->getConstantStrings() as $constantString) {
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$patternStrings[] = $constantString->getValue();
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}
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}
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}
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return $patternStrings;
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}
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private function validatePattern(string $pattern): ?string
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{
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try {
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$msg = null;
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$prev = set_error_handler(function (int $severity, string $message, string $file) use (&$msg): bool {
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$msg = preg_replace("#^preg_match(_all)?\\(.*?\\): #", '', $message);
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return true;
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});
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if ($pattern === '') {
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return 'Empty string is not a valid regular expression';
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}
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Preg::match($pattern, '');
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if ($msg !== null) {
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return $msg;
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}
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} catch (PcreException $e) {
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if ($e->getCode() === PREG_INTERNAL_ERROR && $msg !== null) {
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return $msg;
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}
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return preg_replace('{.*? failed executing ".*": }', '', $e->getMessage());
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} finally {
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restore_error_handler();
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}
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return null;
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}
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}
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