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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\Translation\Loader;

use Symfony\Component\Translation\MessageCatalogue;

/**
 * ArrayLoader loads translations from a PHP array.
 *
 * @author Fabien Potencier <fabien@symfony.com>
 *
 * @api
 */
class ArrayLoader implements LoaderInterface
{
    /**
     * {@inheritdoc}
     *
     * @api
     */
    public function load($resource, $locale, $domain = 'messages')
    {
        $this->flatten($resource);
        $catalogue = new MessageCatalogue($locale);
        $catalogue->add($resource, $domain);

        return $catalogue;
    }

    /**
     * Flattens an nested array of translations
     *
     * The scheme used is:
     *   'key' => array('key2' => array('key3' => 'value'))
     * Becomes:
     *   'key.key2.key3' => 'value'
     *
     * This function takes an array by reference and will modify it
     *
     * @param array  &$messages The array that will be flattened
     * @param array  $subnode Current subnode being parsed, used internally for recursive calls
     * @param string $path    Current path being parsed, used internally for recursive calls
     */
    private function flatten(array &$messages, array $subnode = null, $path = null)
    {
        if (null === $subnode) {
            $subnode =& $messages;
        }
        foreach ($subnode as $key => $value) {
            if (is_array($value)) {
                $nodePath = $path ? $path.'.'.$key : $key;
                $this->flatten($messages, $value, $nodePath);
                if (null === $path) {
                    unset($messages[$key]);
                }
            } elseif (null !== $path) {
                $messages[$path.'.'.$key] = $value;
            }
        }
    }
}
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