<?php declare(strict_types=1);
/*
 * This file is part of sebastian/comparator.
 *
 * (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 SebastianBergmann\Comparator;

use function array_unshift;

final class Factory
{
    private static ?Factory $instance = null;

    /**
     * @var list<Comparator>
     */
    private array $customComparators = [];

    /**
     * @var list<Comparator>
     */
    private array $defaultComparators = [];

    public static function getInstance(): self
    {
        if (self::$instance === null) {
            self::$instance = new self; // @codeCoverageIgnore
        }

        return self::$instance;
    }

    public function __construct()
    {
        $this->registerDefaultComparators();
    }

    public function getComparatorFor(mixed $expected, mixed $actual): Comparator
    {
        foreach ($this->customComparators as $comparator) {
            if ($comparator->accepts($expected, $actual)) {
                return $comparator;
            }
        }

        foreach ($this->defaultComparators as $comparator) {
            if ($comparator->accepts($expected, $actual)) {
                return $comparator;
            }
        }

        throw new RuntimeException('No suitable Comparator implementation found');
    }

    /**
     * Registers a new comparator.
     *
     * This comparator will be returned by getComparatorFor() if its accept() method
     * returns TRUE for the compared values. It has higher priority than the
     * existing comparators, meaning that its accept() method will be invoked
     * before those of the other comparators.
     */
    public function register(Comparator $comparator): void
    {
        array_unshift($this->customComparators, $comparator);

        $comparator->setFactory($this);
    }

    /**
     * Unregisters a comparator.
     *
     * This comparator will no longer be considered by getComparatorFor().
     */
    public function unregister(Comparator $comparator): void
    {
        foreach ($this->customComparators as $key => $_comparator) {
            if ($comparator === $_comparator) {
                unset($this->customComparators[$key]);
            }
        }
    }

    public function reset(): void
    {
        $this->customComparators = [];
    }

    private function registerDefaultComparators(): void
    {
        $this->registerDefaultComparator(new MockObjectComparator);
        $this->registerDefaultComparator(new DateTimeComparator);
        $this->registerDefaultComparator(new DOMNodeComparator);
        $this->registerDefaultComparator(new SplObjectStorageComparator);
        $this->registerDefaultComparator(new ExceptionComparator);
        $this->registerDefaultComparator(new ObjectComparator);
        $this->registerDefaultComparator(new ResourceComparator);
        $this->registerDefaultComparator(new ArrayComparator);
        $this->registerDefaultComparator(new NumericComparator);
        $this->registerDefaultComparator(new ScalarComparator);
        $this->registerDefaultComparator(new TypeComparator);
    }

    private function registerDefaultComparator(Comparator $comparator): void
    {
        $this->defaultComparators[] = $comparator;

        $comparator->setFactory($this);
    }
}

.NET Framework

Project Request

ProjectC

Vehicle Maintenance

Movie Navigator

Customers Exchange

ATM

.NET Core

Mail Daemon

Custom

Buns of code

PHP

Mediabox

Loan Castle

Content Management

Laravel

Phone Check

Frontend

Forex Wall

Business projects

Certification Center

Amerikas Auto

Pet projects

Geolocation Assistant

Web Dynamics

Blackball

Good old times

DOS Clock

BrainOut

Airport Administrator

Atomizer

Mediabox