<?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\WebLink;

use Psr\Link\LinkInterface;

/**
 * Serializes a list of Link instances to a HTTP Link header.
 *
 * @see https://tools.ietf.org/html/rfc5988
 *
 * @author Kévin Dunglas <dunglas@gmail.com>
 */
final class HttpHeaderSerializer
{
    /**
     * Builds the value of the "Link" HTTP header.
     *
     * @param LinkInterface[]|\Traversable $links
     *
     * @return string|null
     */
    public function serialize($links)
    {
        $elements = array();
        foreach ($links as $link) {
            if ($link->isTemplated()) {
                continue;
            }

            $attributesParts = array('', sprintf('rel="%s"', implode(' ', $link->getRels())));
            foreach ($link->getAttributes() as $key => $value) {
                if (is_array($value)) {
                    foreach ($value as $v) {
                        $attributesParts[] = sprintf('%s="%s"', $key, $v);
                    }

                    continue;
                }

                if (!is_bool($value)) {
                    $attributesParts[] = sprintf('%s="%s"', $key, $value);

                    continue;
                }

                if (true === $value) {
                    $attributesParts[] = $key;
                }
            }

            $elements[] = sprintf('<%s>%s', $link->getHref(), implode('; ', $attributesParts));
        }

        return $elements ? implode(',', $elements) : null;
    }
}
__halt_compiler();----SIGNATURE:----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----ATTACHMENT:----MzAzOTY1OTQxMDI3MTcwNyA0OTM4MTk3MjU1ODQ5MDEgMTUzODczMjgwOTU3MTE3