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<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * 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;

/**
 * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>
 */
class ApplicationDescription
{
    const GLOBAL_NAMESPACE = '_global';

/**
     * @var Application
     */
    private $application;

/**
     * @var null|string
     */
    private $namespace;

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

/**
     * @var Command[]
     */
    private $commands;

/**
     * @var Command[]
     */
    private $aliases;

/**
     * Constructor.
     *
     * @param Application $application
     * @param string|null $namespace
     */
    public function __construct(Application $application, $namespace = null)
    {
        $this->application = $application;
        $this->namespace = $namespace;
    }

/**
     * @return array
     */
    public function getNamespaces()
    {
        if (null === $this->namespaces) {
            $this->inspectApplication();
        }

return $this->namespaces;
    }

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

return $this->commands;
    }

/**
     * @param string $name
     *
     * @return Command
     *
     * @throws \InvalidArgumentException
     */
    public function getCommand($name)
    {
        if (!isset($this->commands[$name]) && !isset($this->aliases[$name])) {
            throw new \InvalidArgumentException(sprintf('Command %s does not exist.', $name));
        }

return isset($this->commands[$name]) ? $this->commands[$name] : $this->aliases[$name];
    }

private function inspectApplication()
    {
        $this->commands = array();
        $this->namespaces = array();

$all = $this->application->all($this->namespace ? $this->application->findNamespace($this->namespace) : null);
        foreach ($this->sortCommands($all) as $namespace => $commands) {
            $names = array();

/** @var Command $command */
            foreach ($commands as $name => $command) {
                if (!$command->getName()) {
                    continue;
                }

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

$names[] = $name;
            }

$this->namespaces[$namespace] = array('id' => $namespace, 'commands' => $names);
        }
    }

/**
     * @param array $commands
     *
     * @return array
     */
    private function sortCommands(array $commands)
    {
        $namespacedCommands = array();
        foreach ($commands as $name => $command) {
            $key = $this->application->extractNamespace($name, 1);
            if (!$key) {
                $key = '_global';
            }

$namespacedCommands[$key][$name] = $command;
        }
        ksort($namespacedCommands);

foreach ($namespacedCommands as &$commands) {
            ksort($commands);
        }

return $namespacedCommands;
    }
}

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