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<?php
declare(strict_types=1);
namespace Doctrine\DBAL\Schema;
use Doctrine\DBAL\Platforms\AbstractPlatform;
use function array_map;
use function assert;
use function count;
use function strtolower;
/**
 * Compares two Schemas and return an instance of SchemaDiff.
 */
class Comparator
{
    /** @internal The comparator can be only instantiated by a schema manager. */
    public function __construct(private readonly AbstractPlatform $platform)
    {
    }
    /**
     * Returns the differences between the schemas.
     */
    public function compareSchemas(Schema $oldSchema, Schema $newSchema): SchemaDiff
    {
        $createdSchemas   = [];
        $droppedSchemas   = [];
        $createdTables    = [];
        $alteredTables    = [];
        $droppedTables    = [];
        $createdSequences = [];
        $alteredSequences = [];
        $droppedSequences = [];
        foreach ($newSchema->getNamespaces() as $newNamespace) {
            if ($oldSchema->hasNamespace($newNamespace)) {
                continue;
            }
            $createdSchemas[] = $newNamespace;
        }
 
 
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