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name : RoutableFragmentRenderer.php
 <?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\HttpKernel\Fragment;

use Symfony\Component\HttpKernel\Controller\ControllerReference;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpKernel\EventListener\FragmentListener;

/**
 * Adds the possibility to generate a fragment URI for a given Controller.
 *
 * @author Fabien Potencier <fabien@symfony.com>
 */
abstract class RoutableFragmentRenderer implements FragmentRendererInterface
{
    private $fragmentPath = '/_fragment';

    /**
     * Sets the fragment path that triggers the fragment listener.
     *
     * @param string $path The path
     *
     * @see FragmentListener
     */
    public function setFragmentPath($path)
    {
        $this->fragmentPath = $path;
    }

    /**
     * Generates a fragment URI for a given controller.
     *
     * @param ControllerReference  $reference A ControllerReference instance
     * @param Request              $request   A Request instance
     * @param Boolean              $absolute  Whether to generate an absolute URL or not
     * @param Boolean              $strict    Whether to allow non-scalar attributes or not
     *
     * @return string A fragment URI
     */
    protected function generateFragmentUri(ControllerReference $reference, Request $request, $absolute = false, $strict = true)
    {
        if ($strict) {
            $this->checkNonScalar($reference->attributes);
        }

        // We need to forward the current _format and _locale values as we don't have
        // a proper routing pattern to do the job for us.
        // This makes things inconsistent if you switch from rendering a controller
        // to rendering a route if the route pattern does not contain the special
        // _format and _locale placeholders.
        if (!isset($reference->attributes['_format'])) {
            $reference->attributes['_format'] = $request->getRequestFormat();
        }
        if (!isset($reference->attributes['_locale'])) {
            $reference->attributes['_locale'] = $request->getLocale();
        }

        $reference->attributes['_controller'] = $reference->controller;

        $reference->query['_path'] = http_build_query($reference->attributes, '', '&');

        $path = $this->fragmentPath.'?'.http_build_query($reference->query, '', '&');

        if ($absolute) {
            return $request->getUriForPath($path);
        }

        return $request->getBaseUrl().$path;
    }

    private function checkNonScalar($values)
    {
        foreach ($values as $key => $value) {
            if (is_array($value)) {
                $this->checkNonScalar($value);
            } elseif (!is_scalar($value) && null !== $value) {
                throw new \LogicException(sprintf('Controller attributes cannot contain non-scalar/non-null values (value for key "%s" is not a scalar or null).', $key));
            }
        }
    }
}
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