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File / Folder	Size	Action
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Exception	--	ren
File	--	ren
RateLimiter	--	ren
RequestMatcher	--	ren
Session	--	ren
Test	--	ren
AcceptHeader.php	8.811KB	edt ren
AcceptHeaderItem.php	3.158KB	edt ren
BinaryFileResponse.php	13.226KB	edt ren
CHANGELOG.md	22.019KB	edt ren
ChainRequestMatcher.php	0.853KB	edt ren
Cookie.php	11.53KB	edt ren
EventStreamResponse.php	2.876KB	edt ren
FileBag.php	3.767KB	edt ren
HeaderBag.php	6.937KB	edt ren
HeaderUtils.php	9.073KB	edt ren
InputBag.php	5.259KB	edt ren
IpUtils.php	8.985KB	edt ren
JsonResponse.php	6.446KB	edt ren
LICENSE	1.043KB	edt ren
ParameterBag.php	8.03KB	edt ren
README.md	0.514KB	edt ren
RedirectResponse.php	2.567KB	edt ren
Request.php	75.754KB	edt ren
RequestMatcherInterface...	0.606KB	edt ren
RequestStack.php	3.051KB	edt ren
Response.php	39.601KB	edt ren
ResponseHeaderBag.php	7.789KB	edt ren
ServerBag.php	3.916KB	edt ren
ServerEvent.php	3.299KB	edt ren
StreamedJsonResponse.php	5.64KB	edt ren
StreamedResponse.php	3.568KB	edt ren
UriSigner.php	7.53KB	edt ren
UrlHelper.php	3.051KB	edt ren
composer.json	1.33KB	edt ren

<?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\HttpFoundation;

/**
 * StreamedJsonResponse represents a streamed HTTP response for JSON.
 *
 * A StreamedJsonResponse uses a structure and generics to create an
 * efficient resource-saving JSON response.
 *
 * It is recommended to use flush() function after a specific number of items to directly stream the data.
 *
 * @see flush()
 *
 * @author Alexander Schranz <alexander@sulu.io>
 *
 * Example usage:
 *
 *     function loadArticles(): \Generator
 *         // some streamed loading
 *         yield ['title' => 'Article 1'];
 *         yield ['title' => 'Article 2'];
 *         yield ['title' => 'Article 3'];
 *         // recommended to use flush() after every specific number of items
 *     }),
 *
 *     $response = new StreamedJsonResponse(
 *         // json structure with generators in which will be streamed
 *         [
 *             '_embedded' => [
 *                 'articles' => loadArticles(), // any generator which you want to stream as list of data
 *             ],
 *         ],
 *     );
 */
class StreamedJsonResponse extends StreamedResponse
{
    private const PLACEHOLDER = '__symfony_json__';

/**
     * @param mixed[]                        $data            JSON Data containing PHP generators which will be streamed as list of data or a Generator
     * @param int                            $status          The HTTP status code (200 "OK" by default)
     * @param array<string, string|string[]> $headers         An array of HTTP headers
     * @param int                            $encodingOptions Flags for the json_encode() function
     */
    public function __construct(
        private readonly iterable $data,
        int $status = 200,
        array $headers = [],
        private int $encodingOptions = JsonResponse::DEFAULT_ENCODING_OPTIONS,
    ) {
        parent::__construct($this->stream(...), $status, $headers);

if (!$this->headers->get('Content-Type')) {
            $this->headers->set('Content-Type', 'application/json');
        }
    }

private function stream(): void
    {
        $jsonEncodingOptions = \JSON_THROW_ON_ERROR | $this->encodingOptions;
        $keyEncodingOptions = $jsonEncodingOptions & ~\JSON_NUMERIC_CHECK;

$this->streamData($this->data, $jsonEncodingOptions, $keyEncodingOptions);
    }

private function streamData(mixed $data, int $jsonEncodingOptions, int $keyEncodingOptions): void
    {
        if (\is_array($data)) {
            $this->streamArray($data, $jsonEncodingOptions, $keyEncodingOptions);

return;
        }

if (is_iterable($data) && !$data instanceof \JsonSerializable) {
            $this->streamIterable($data, $jsonEncodingOptions, $keyEncodingOptions);

return;
        }

echo json_encode($data, $jsonEncodingOptions);
    }

private function streamArray(array $data, int $jsonEncodingOptions, int $keyEncodingOptions): void
    {
        $generators = [];

array_walk_recursive($data, function (&$item, $key) use (&$generators) {
            if (self::PLACEHOLDER === $key) {
                // if the placeholder is already in the structure it should be replaced with a new one that explode
                // works like expected for the structure
                $generators[] = $key;
            }

// generators should be used but for better DX all kind of Traversable and objects are supported
            if (\is_object($item)) {
                $generators[] = $item;
                $item = self::PLACEHOLDER;
            } elseif (self::PLACEHOLDER === $item) {
                // if the placeholder is already in the structure it should be replaced with a new one that explode
                // works like expected for the structure
                $generators[] = $item;
            }
        });

$jsonParts = explode('"'.self::PLACEHOLDER.'"', json_encode($data, $jsonEncodingOptions));

foreach ($generators as $index => $generator) {
            // send first and between parts of the structure
            echo $jsonParts[$index];

$this->streamData($generator, $jsonEncodingOptions, $keyEncodingOptions);
        }

// send last part of the structure
        echo $jsonParts[array_key_last($jsonParts)];
    }

private function streamIterable(iterable $iterable, int $jsonEncodingOptions, int $keyEncodingOptions): void
    {
        $isFirstItem = true;
        $startTag = '[';

foreach ($iterable as $key => $item) {
            if ($isFirstItem) {
                $isFirstItem = false;
                // depending on the first elements key the generator is detected as a list or map
                // we can not check for a whole list or map because that would hurt the performance
                // of the streamed response which is the main goal of this response class
                if (0 !== $key) {
                    $startTag = '{';
                }

echo $startTag;
            } else {
                // if not first element of the generic, a separator is required between the elements
                echo ',';
            }

if ('{' === $startTag) {
                echo json_encode((string) $key, $keyEncodingOptions).':';
            }

$this->streamData($item, $jsonEncodingOptions, $keyEncodingOptions);
        }

if ($isFirstItem) { // indicates that the generator was empty
            echo '[';
        }

echo '[' === $startTag ? ']' : '}';
    }
}

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