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<?php
namespace Amp\Serialization;
final class JsonSerializer implements Serializer
{
// Equal to JSON_THROW_ON_ERROR, only available in PHP 7.3+.
private const THROW_ON_ERROR = 4194304;
/** @var bool */
private $associative;
/** @var int */
private $encodeOptions;
/** @var int */
private $decodeOptions;
/** @var int */
private $depth;
/**
* Creates a JSON serializer that decodes objects to associative arrays.
*
* @param int $encodeOptions @see \json_encode() options parameter.
* @param int $decodeOptions @see \json_decode() options parameter.
* @param int $depth Maximum recursion depth.
*
* @return self
*/
public static function withAssociativeArrays(int $encodeOptions = 0, int $decodeOptions = 0, int $depth = 512): self
{
return new self(true, $encodeOptions, $decodeOptions, $depth);
}
/**
* Creates a JSON serializer that decodes objects to instances of stdClass.
*
* @param int $encodeOptions @see \json_encode() options parameter.
* @param int $decodeOptions @see \json_decode() options parameter.
* @param int $depth Maximum recursion depth.
*
* @return self
*/
public static function withObjects(int $encodeOptions = 0, int $decodeOptions = 0, int $depth = 512): self
{
return new self(false, $encodeOptions, $decodeOptions, $depth);
}
private function __construct(bool $associative, int $encodeOptions = 0, int $decodeOptions = 0, int $depth = 512)
{
$this->associative = $associative;
$this->depth = $depth;
// We don't want to throw on errors, we manually check for errors using json_last_error().
$this->encodeOptions = $encodeOptions & ~self::THROW_ON_ERROR;
$this->decodeOptions = $decodeOptions & ~self::THROW_ON_ERROR;
}
public function serialize($data): string
{
$result = \json_encode($data, $this->encodeOptions, $this->depth);
switch ($code = \json_last_error()) {
case \JSON_ERROR_NONE:
return $result;
default:
throw new SerializationException(\json_last_error_msg(), $code);
}
}
public function unserialize(string $data)
{
$result = \json_decode($data, $this->associative, $this->depth, $this->decodeOptions);
switch ($code = \json_last_error()) {
case \JSON_ERROR_NONE:
return $result;
default:
throw new SerializationException(\json_last_error_msg(), $code);
}
}
}