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<?php

/*
 * This file is part of JSON-API.
 *
 * (c) Toby Zerner <toby.zerner@gmail.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Tobscure\JsonApi;

class Util
{
    /**
     * Parse relationship paths.
     *
     * Given a flat array of relationship paths like:
     *
     * ['user', 'user.employer', 'user.employer.country', 'comments']
     *
     * create a nested array of relationship paths one-level deep that can
     * be passed on to other serializers:
     *
     * ['user' => ['employer', 'employer.country'], 'comments' => []]
     *
     * @param array $paths
     *
     * @return array
     */
    public static function parseRelationshipPaths(array $paths)
    {
        $tree = [];

foreach ($paths as $path) {
            list($primary, $nested) = array_pad(explode('.', $path, 2), 2, null);

if (! isset($tree[$primary])) {
                $tree[$primary] = [];
            }

if ($nested) {
                $tree[$primary][] = $nested;
            }
        }

return $tree;
    }
}