refactor: comments

src/Kernel.php

@@ -0,0 +1,70 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Pest;
+
+use PHPUnit\TextUI\Application;
+
+/**
+ * @internal
+ */
+final class Kernel
+{
+    /**
+     * The Kernel bootstrappers.
+     *
+     * @var array<int, class-string>
+     */
+    private static array $bootstrappers = [
+        Bootstrappers\BootExceptionHandler::class,
+        Bootstrappers\BootEmitter::class,
+        Bootstrappers\BootSubscribers::class,
+        Bootstrappers\BootFiles::class,
+    ];
+
+    /**
+     * Creates a new Kernel instance.
+     */
+    public function __construct(
+        private Application $application
+    ) {
+        // ..
+    }
+
+    /**
+     * Boots the Kernel.
+     */
+    public static function boot(): self
+    {
+        foreach (self::$bootstrappers as $bootstrapper) {
+            (new $bootstrapper())->__invoke();
+        }
+
+        return new self(new Application());
+    }
+
+    /**
+     * Handles the given argv.
+     *
+     * @param array<int, string> $argv
+     */
+    public function handle(array $argv): int
+    {
+        $argv = (new Plugins\Actions\HandleArguments())->__invoke($argv);
+
+        $result = $this->application->run(
+            $argv, false,
+        );
+
+        return (new Plugins\Actions\AddsOutput())->__invoke($result);
+    }
+
+    /**
+     * Shutdown the Kernel.
+     */
+    public function shutdown(): void
+    {
+        // TODO
+    }
+}