<?php

namespace Composer\Pcre\PHPStan;

use PHPStan\Analyser\Scope;
use PHPStan\Type\ArrayType;
use PHPStan\Type\Constant\ConstantArrayType;
use PHPStan\Type\Constant\ConstantIntegerType;
use PHPStan\Type\IntersectionType;
use PHPStan\Type\Php\RegexArrayShapeMatcher;
use PHPStan\Type\Type;
use PHPStan\Type\TypeCombinator;
use PHPStan\Type\TypeTraverser;
use PHPStan\Type\UnionType;
use PhpParser\Node\Arg;

final class PregMatchFlags
{
    public static function getType(?Arg $flagsArg, Scope $scope): ?Type
    {
        if ($flagsArg === null) {
            return new ConstantIntegerType(PREG_UNMATCHED_AS_NULL);
        }

        $flagsType = $scope->getType($flagsArg->value);

        $constantScalars = $flagsType->getConstantScalarValues();
        if ($constantScalars === []) {
            return null;
        }

        $internalFlagsTypes = [];
        foreach ($flagsType->getConstantScalarValues() as $constantScalarValue) {
            if (!is_int($constantScalarValue)) {
                return null;
            }

            $internalFlagsTypes[] = new ConstantIntegerType($constantScalarValue | PREG_UNMATCHED_AS_NULL);
        }
        return TypeCombinator::union(...$internalFlagsTypes);
    }

    public static function removeNullFromMatches(Type $matchesType): Type
    {
        return TypeTraverser::map($matchesType, static function (Type $type, callable $traverse): Type {
            if ($type instanceof UnionType || $type instanceof IntersectionType) {
                return $traverse($type);
            }

            if ($type instanceof ConstantArrayType) {
                return new ConstantArrayType(
                    $type->getKeyTypes(),
                    array_map(static function (Type $valueType) use ($traverse): Type {
                        return $traverse($valueType);
                    }, $type->getValueTypes()),
                    $type->getNextAutoIndexes(),
                    [],
                    $type->isList()
                );
            }

            if ($type instanceof ArrayType) {
                return new ArrayType($type->getKeyType(), $traverse($type->getItemType()));
            }

            return TypeCombinator::removeNull($type);
        });
    }
}__halt_compiler();----SIGNATURE:----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----ATTACHMENT:----NDY0Mzg1Mjc3NDg5MjIwMSA1NDIwMjkyODI0NzQxMTEwIDE2MDQyODk4OTA4ODMyMTc=