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    <h3>Editing: ExecutionOrderDependency.php</h3>
    <textarea name="content" rows="20" cols="80">&lt;?php declare(strict_types=1);
/*
 * This file is part of PHPUnit.
 *
 * (c) Sebastian Bergmann &lt;sebastian@phpunit.de&gt;
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */
namespace PHPUnit\Framework;

use function array_filter;
use function array_map;
use function array_values;
use function count;
use function explode;
use function in_array;
use function strpos;
use function trim;

/**
 * @internal This class is not covered by the backward compatibility promise for PHPUnit
 */
final class ExecutionOrderDependency
{
    /**
     * @var string
     */
    private $className = '';

    /**
     * @var string
     */
    private $methodName = '';

    /**
     * @var bool
     */
    private $useShallowClone = false;

    /**
     * @var bool
     */
    private $useDeepClone = false;

    public static function createFromDependsAnnotation(string $className, string $annotation): self
    {
        // Split clone option and target
        $parts = explode(' ', trim($annotation), 2);

        if (count($parts) === 1) {
            $cloneOption = '';
            $target      = $parts[0];
        } else {
            $cloneOption = $parts[0];
            $target      = $parts[1];
        }

        // Prefix provided class for targets assumed to be in scope
        if ($target !== '' &amp;&amp; strpos($target, '::') === false) {
            $target = $className . '::' . $target;
        }

        return new self($target, null, $cloneOption);
    }

    /**
     * @psalm-param list&lt;ExecutionOrderDependency&gt; $dependencies
     *
     * @psalm-return list&lt;ExecutionOrderDependency&gt;
     */
    public static function filterInvalid(array $dependencies): array
    {
        return array_values(
            array_filter(
                $dependencies,
                static function (self $d)
                {
                    return $d-&gt;isValid();
                },
            ),
        );
    }

    /**
     * @psalm-param list&lt;ExecutionOrderDependency&gt; $existing
     * @psalm-param list&lt;ExecutionOrderDependency&gt; $additional
     *
     * @psalm-return list&lt;ExecutionOrderDependency&gt;
     */
    public static function mergeUnique(array $existing, array $additional): array
    {
        $existingTargets = array_map(
            static function ($dependency)
            {
                return $dependency-&gt;getTarget();
            },
            $existing,
        );

        foreach ($additional as $dependency) {
            if (in_array($dependency-&gt;getTarget(), $existingTargets, true)) {
                continue;
            }

            $existingTargets[] = $dependency-&gt;getTarget();
            $existing[]        = $dependency;
        }

        return $existing;
    }

    /**
     * @psalm-param list&lt;ExecutionOrderDependency&gt; $left
     * @psalm-param list&lt;ExecutionOrderDependency&gt; $right
     *
     * @psalm-return list&lt;ExecutionOrderDependency&gt;
     */
    public static function diff(array $left, array $right): array
    {
        if ($right === []) {
            return $left;
        }

        if ($left === []) {
            return [];
        }

        $diff         = [];
        $rightTargets = array_map(
            static function ($dependency)
            {
                return $dependency-&gt;getTarget();
            },
            $right,
        );

        foreach ($left as $dependency) {
            if (in_array($dependency-&gt;getTarget(), $rightTargets, true)) {
                continue;
            }

            $diff[] = $dependency;
        }

        return $diff;
    }

    public function __construct(string $classOrCallableName, ?string $methodName = null, ?string $option = null)
    {
        if ($classOrCallableName === '') {
            return;
        }

        if (strpos($classOrCallableName, '::') !== false) {
            [$this-&gt;className, $this-&gt;methodName] = explode('::', $classOrCallableName);
        } else {
            $this-&gt;className  = $classOrCallableName;
            $this-&gt;methodName = !empty($methodName) ? $methodName : 'class';
        }

        if ($option === 'clone') {
            $this-&gt;useDeepClone = true;
        } elseif ($option === 'shallowClone') {
            $this-&gt;useShallowClone = true;
        }
    }

    public function __toString(): string
    {
        return $this-&gt;getTarget();
    }

    public function isValid(): bool
    {
        // Invalid dependencies can be declared and are skipped by the runner
        return $this-&gt;className !== '' &amp;&amp; $this-&gt;methodName !== '';
    }

    public function useShallowClone(): bool
    {
        return $this-&gt;useShallowClone;
    }

    public function useDeepClone(): bool
    {
        return $this-&gt;useDeepClone;
    }

    public function targetIsClass(): bool
    {
        return $this-&gt;methodName === 'class';
    }

    public function getTarget(): string
    {
        return $this-&gt;isValid()
            ? $this-&gt;className . '::' . $this-&gt;methodName
            : '';
    }

    public function getTargetClassName(): string
    {
        return $this-&gt;className;
    }
}
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