Simple File Manage Design by index.php

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<?php declare(strict_types=1);
/*
 * This file is part of PHPUnit.
 *
 * (c) Sebastian Bergmann <sebastian@phpunit.de>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */
namespace PHPUnit\TextUI\Configuration;

/**
 * @no-named-arguments Parameter names are not covered by the backward compatibility promise for PHPUnit
 *
 * @internal This class is not covered by the backward compatibility promise for PHPUnit
 */
final class SourceFilter
{
    private static ?self $instance = null;

/**
     * @psalm-var array<non-empty-string, true>
     */
    private readonly array $map;

public static function instance(): self
    {
        if (self::$instance === null) {
            self::$instance = new self(
                (new SourceMapper)->map(
                    Registry::get()->source(),
                ),
            );
        }

return self::$instance;
    }

/**
     * @psalm-param array<non-empty-string, true> $map
     */
    public function __construct(array $map)
    {
        $this->map = $map;
    }

public function includes(string $path): bool
    {
        return isset($this->map[$path]);
    }
}