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Editing: PregMatchTypeSpecifyingExtension.php

<?php declare(strict_types=1);

namespace Composer\Pcre\PHPStan;

use Composer\Pcre\Preg;
use PhpParser\Node\Expr\StaticCall;
use PHPStan\Analyser\Scope;
use PHPStan\Analyser\SpecifiedTypes;
use PHPStan\Analyser\TypeSpecifier;
use PHPStan\Analyser\TypeSpecifierAwareExtension;
use PHPStan\Analyser\TypeSpecifierContext;
use PHPStan\Reflection\MethodReflection;
use PHPStan\TrinaryLogic;
use PHPStan\Type\Constant\ConstantArrayType;
use PHPStan\Type\Php\RegexArrayShapeMatcher;
use PHPStan\Type\StaticMethodTypeSpecifyingExtension;
use PHPStan\Type\TypeCombinator;
use PHPStan\Type\Type;

final class PregMatchTypeSpecifyingExtension implements StaticMethodTypeSpecifyingExtension, TypeSpecifierAwareExtension
{
    /**
     * @var TypeSpecifier
     */
    private $typeSpecifier;

/**
     * @var RegexArrayShapeMatcher
     */
    private $regexShapeMatcher;

public function __construct(RegexArrayShapeMatcher $regexShapeMatcher)
    {
        $this->regexShapeMatcher = $regexShapeMatcher;
    }

public function setTypeSpecifier(TypeSpecifier $typeSpecifier): void
    {
        $this->typeSpecifier = $typeSpecifier;
    }

public function getClass(): string
    {
        return Preg::class;
    }

public function isStaticMethodSupported(MethodReflection $methodReflection, StaticCall $node, TypeSpecifierContext $context): bool
    {
        return in_array($methodReflection->getName(), [
                'match', 'isMatch', 'matchStrictGroups', 'isMatchStrictGroups',
                'matchAll', 'isMatchAll', 'matchAllStrictGroups', 'isMatchAllStrictGroups'
            ], true)
            && !$context->null();
    }

public function specifyTypes(MethodReflection $methodReflection, StaticCall $node, Scope $scope, TypeSpecifierContext $context): SpecifiedTypes
    {
        $args = $node->getArgs();
        $patternArg = $args[0] ?? null;
        $subjectArg = $args[1] ?? null;
        $matchesArg = $args[2] ?? null;
        $flagsArg = $args[3] ?? null;

$subjectTypes = new SpecifiedTypes();
        if ($patternArg === null) {
            return $subjectTypes;
        }

if (
            $subjectArg !== null
            && $context->true()
            && $scope->getType($subjectArg->value)->isString()->yes()
        ) {
            $subjectType = $this->regexShapeMatcher->matchSubjectExpr($patternArg->value, $scope);
            if ($subjectType !== null) {
                $subjectTypes = $this->typeSpecifier->create(
                    $subjectArg->value,
                    $subjectType,
                    $context,
                    $scope,
                )->setRootExpr($node);
            }
        }

if ($matchesArg === null) {
            return $subjectTypes;
        }

$flagsType = PregMatchFlags::getType($flagsArg, $scope);
        if ($flagsType === null) {
            return $subjectTypes;
        }

if (stripos($methodReflection->getName(), 'matchAll') !== false) {
            $matchedType = $this->regexShapeMatcher->matchAllExpr($patternArg->value, $flagsType, TrinaryLogic::createFromBoolean($context->true()), $scope);
        } else {
            $matchedType = $this->regexShapeMatcher->matchExpr($patternArg->value, $flagsType, TrinaryLogic::createFromBoolean($context->true()), $scope);
        }

if ($matchedType === null) {
            return $subjectTypes;
        }

if (
            in_array($methodReflection->getName(), ['matchStrictGroups', 'isMatchStrictGroups', 'matchAllStrictGroups', 'isMatchAllStrictGroups'], true)
        ) {
            $matchedType = PregMatchFlags::removeNullFromMatches($matchedType);
        }

$overwrite = false;
        if ($context->false()) {
            $overwrite = true;
            $context = $context->negate();
        }

$specifiedTypes = $this->typeSpecifier->create(
            $matchesArg->value,
            $matchedType,
            $context,
            $scope
        )->setRootExpr($node);

return $subjectTypes->unionWith($overwrite ? $specifiedTypes->setAlwaysOverwriteTypes() : $specifiedTypes);
    }
}

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