<?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\Helper;
use Symfony\Component\Console\Exception\InvalidArgumentException;
/**
* HelperSet represents a set of helpers to be used with a command.
*
* @author Fabien Potencier <fabien@symfony.com>
*
* @implements \IteratorAggregate<string, HelperInterface>
*/
class HelperSet implements \IteratorAggregate
{
/** @var array<string, HelperInterface> */
private array $helpers = [];
/**
* @param HelperInterface[] $helpers
*/
public function __construct(array $helpers = [])
{
foreach ($helpers as $alias => $helper) {
$this->set($helper, \is_int($alias) ? null : $alias);
}
}
/**
* @return void
*/
public function set(HelperInterface $helper, ?string $alias = null)
{
$this->helpers[$helper->getName()] = $helper;
if (null !== $alias) {
$this->helpers[$alias] = $helper;
}
$helper->setHelperSet($this);
}
/**
* Returns true if the helper if defined.
*/
public function has(string $name): bool
{
return isset($this->helpers[$name]);
}
/**
* Gets a helper value.
*
* @throws InvalidArgumentException if the helper is not defined
*/
public function get(string $name): HelperInterface
{
if (!$this->has($name)) {
throw new InvalidArgumentException(\sprintf('The helper "%s" is not defined.', $name));
}
return $this->helpers[$name];
}
public function getIterator(): \Traversable
{
return new \ArrayIterator($this->helpers);
}
}
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