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

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text/x-php
Expires
Tue, Aug 18, 22:26 (1 d, 13 h)
Storage Engine
local-disk
Storage Format
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Storage Handle
78/7e/ff4035d00fc326308ba2a4b25c19
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InvalidRegexPatternRule.php (4 KB)

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