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<?php |
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namespace League\JsonGuard; |
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use League\JsonGuard\Pointer\InvalidPointerException; |
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use League\JsonGuard\Pointer\Parser; |
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/** |
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* A simple JSON Pointer implementation that can traverse |
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* an object resulting from a json_decode() call. |
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* |
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* @see https://tools.ietf.org/html/rfc6901 |
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*/ |
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class Pointer |
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{ |
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/** |
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* @var object |
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*/ |
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private $json; |
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/** |
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* Pointer constructor. |
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* @param object $json |
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*/ |
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public function __construct($json) |
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{ |
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$this->json = $json; |
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} |
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/** |
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* @param string $pointer |
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* @return mixed |
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* @throws InvalidPointerException |
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*/ |
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public function get($pointer) |
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{ |
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$pointer = (new Parser($pointer))->get(); |
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return $this->traverse($this->json, $pointer); |
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} |
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/** |
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* @param string $pointer |
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* @return bool |
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*/ |
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public function has($pointer) |
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{ |
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try { |
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$this->get($pointer); |
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return true; |
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} catch (InvalidPointerException $e) { |
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return false; |
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} |
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} |
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/** |
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* @param string $pointer |
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* @param mixed $data |
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* @return null |
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* @throws InvalidPointerException |
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* @throws \InvalidArgumentException |
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* |
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*/ |
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public function set($pointer, $data) |
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{ |
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if ($pointer === '') { |
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throw new \InvalidArgumentException('Cannot replace the object with set.'); |
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} |
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$pointer = (new Parser($pointer))->get(); |
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// Simple way to check if the path exists. |
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// It will throw an exception if it isn't valid. |
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$this->traverse($this->json, $pointer); |
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$replace = array_pop($pointer); |
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$target = $this->json; |
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foreach ($pointer as $segment) { |
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if (is_array($target)) { |
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$target =& $target[$segment]; |
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} else { |
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$target =& $target->$segment; |
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} |
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} |
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if (is_array($target)) { |
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if ($replace === '-') { |
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$target[] = $data; |
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} else { |
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$target[$replace] = $data; |
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} |
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} elseif (is_object($target)) { |
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$target->$replace = $data; |
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} else { |
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throw new \InvalidArgumentException('Cannot set data because pointer target is not an object or array.'); |
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} |
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return null; |
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} |
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/** |
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* @param mixed $json The result of a json_decode call or a portion of it. |
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* @param array $pointer The parsed pointer |
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* @return mixed |
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*/ |
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private function traverse($json, $pointer) |
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{ |
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// If we are out of pointers to process we are done. |
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if (empty($pointer)) { |
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return $json; |
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} |
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$reference = array_shift($pointer); |
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// who does this? |
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if ($reference === '' && property_exists($json, '_empty_')) { |
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return $this->traverse($json->_empty_, $pointer); |
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} |
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if (is_object($json)) { |
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if (!property_exists($json, $reference)) { |
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throw InvalidPointerException::nonexistentValue($reference); |
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} |
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return $this->traverse($json->$reference, $pointer); |
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} elseif (is_array($json)) { |
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if ($reference === '-') { |
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return $json; |
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} |
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if (!array_key_exists($reference, $json)) { |
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throw InvalidPointerException::nonexistentValue($reference); |
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} |
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return $this->traverse($json[$reference], $pointer); |
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} else { |
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throw InvalidPointerException::nonexistentValue($reference); |
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} |
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} |
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} |
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thephpleague /
json-guard
