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    <h3>Editing: ApplicationDescription.php</h3>
    <textarea name="content" rows="20" cols="80">&lt;?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier &lt;fabien@symfony.com&gt;
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\Console\Descriptor;

use Symfony\Component\Console\Application;
use Symfony\Component\Console\Command\Command;
use Symfony\Component\Console\Exception\CommandNotFoundException;

/**
 * @author Jean-François Simon &lt;jeanfrancois.simon@sensiolabs.com&gt;
 *
 * @internal
 */
class ApplicationDescription
{
    public const GLOBAL_NAMESPACE = '_global';

    private $application;
    private $namespace;
    private $showHidden;

    /**
     * @var array
     */
    private $namespaces;

    /**
     * @var array&lt;string, Command&gt;
     */
    private $commands;

    /**
     * @var array&lt;string, Command&gt;
     */
    private $aliases;

    public function __construct(Application $application, ?string $namespace = null, bool $showHidden = false)
    {
        $this-&gt;application = $application;
        $this-&gt;namespace = $namespace;
        $this-&gt;showHidden = $showHidden;
    }

    public function getNamespaces(): array
    {
        if (null === $this-&gt;namespaces) {
            $this-&gt;inspectApplication();
        }

        return $this-&gt;namespaces;
    }

    /**
     * @return Command[]
     */
    public function getCommands(): array
    {
        if (null === $this-&gt;commands) {
            $this-&gt;inspectApplication();
        }

        return $this-&gt;commands;
    }

    /**
     * @throws CommandNotFoundException
     */
    public function getCommand(string $name): Command
    {
        if (!isset($this-&gt;commands[$name]) &amp;&amp; !isset($this-&gt;aliases[$name])) {
            throw new CommandNotFoundException(sprintf('Command &quot;%s&quot; does not exist.', $name));
        }

        return $this-&gt;commands[$name] ?? $this-&gt;aliases[$name];
    }

    private function inspectApplication()
    {
        $this-&gt;commands = [];
        $this-&gt;namespaces = [];

        $all = $this-&gt;application-&gt;all($this-&gt;namespace ? $this-&gt;application-&gt;findNamespace($this-&gt;namespace) : null);
        foreach ($this-&gt;sortCommands($all) as $namespace =&gt; $commands) {
            $names = [];

            /** @var Command $command */
            foreach ($commands as $name =&gt; $command) {
                if (!$command-&gt;getName() || (!$this-&gt;showHidden &amp;&amp; $command-&gt;isHidden())) {
                    continue;
                }

                if ($command-&gt;getName() === $name) {
                    $this-&gt;commands[$name] = $command;
                } else {
                    $this-&gt;aliases[$name] = $command;
                }

                $names[] = $name;
            }

            $this-&gt;namespaces[$namespace] = ['id' =&gt; $namespace, 'commands' =&gt; $names];
        }
    }

    private function sortCommands(array $commands): array
    {
        $namespacedCommands = [];
        $globalCommands = [];
        $sortedCommands = [];
        foreach ($commands as $name =&gt; $command) {
            $key = $this-&gt;application-&gt;extractNamespace($name, 1);
            if (\in_array($key, ['', self::GLOBAL_NAMESPACE], true)) {
                $globalCommands[$name] = $command;
            } else {
                $namespacedCommands[$key][$name] = $command;
            }
        }

        if ($globalCommands) {
            ksort($globalCommands);
            $sortedCommands[self::GLOBAL_NAMESPACE] = $globalCommands;
        }

        if ($namespacedCommands) {
            ksort($namespacedCommands, \SORT_STRING);
            foreach ($namespacedCommands as $key =&gt; $commandsSet) {
                ksort($commandsSet);
                $sortedCommands[$key] = $commandsSet;
            }
        }

        return $sortedCommands;
    }
}
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