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<?php |
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declare(strict_types=1); |
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namespace Ivory\Value; |
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/** |
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* Encapsulation of JSON-encoded data. |
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* |
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* The meaning of this class is to represent JSON-encoded data including the semantically insignificant whitespace among |
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* tokens, as well as the order of object keys and multiple occurrences of the same key (when working with the actual |
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* value, the last occurrence of each key is actually used). This reflects the PostgreSQL `JSON` data type. In order to |
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* do that, both the value and its JSON encoding are kept in the object. |
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* |
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* The objects are immutable, i.e., operations always produce a new object. |
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*/ |
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class Json |
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{ |
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private $value; |
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private $encoded; |
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/** |
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* @param mixed $value value to be represented |
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* @return Json |
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*/ |
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public static function fromValue($value): Json |
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{ |
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$json = self::jsonEncode($value); |
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return new Json($value, $json); |
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} |
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/** |
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* @param string $json JSON-encoded value |
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* @return Json |
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*/ |
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public static function fromEncoded(string $json): Json |
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{ |
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$value = self::jsonDecode($json); |
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return new Json($value, $json); |
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} |
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/** |
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* @return Json representation of the <tt>null</tt> value; always returns the same object |
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*/ |
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public static function null(): Json |
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{ |
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static $inst = null; |
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if ($inst === null) { |
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$inst = self::fromValue(null); |
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} |
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return $inst; |
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} |
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private function __construct($value, string $encoded) |
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{ |
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$this->value = $value; |
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$this->encoded = $encoded; |
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} |
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/** |
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* @return bool|int|float|string|array|\stdClass the represented value |
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*/ |
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public function getValue() |
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{ |
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return $this->value; |
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} |
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/** |
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* @return string the JSON encoding of the represented value |
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*/ |
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public function getEncoded(): string |
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{ |
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return $this->encoded; |
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} |
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private static function jsonEncode($value): string |
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{ |
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$json = json_encode($value, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES); |
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if ($json === false) { |
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throw new \InvalidArgumentException(json_last_error_msg()); |
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} |
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return $json; |
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} |
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private static function jsonDecode(string $json) |
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{ |
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$value = json_decode($json); |
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if ($value === null && json_last_error() != JSON_ERROR_NONE) { |
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throw new \InvalidArgumentException(json_last_error_msg()); |
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} |
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return $value; |
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} |
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} |
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ondrej-bouda /
ivory
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