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<?php |
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namespace League\JsonReference; |
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use League\JsonReference\Pointer\InvalidPointerException; |
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use League\JsonReference\Pointer\NonExistentValue; |
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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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final class Pointer |
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{ |
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/** |
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* @var object|array |
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*/ |
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private $json; |
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/** |
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* @param object|array $json |
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*/ |
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public function __construct(&$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 $pointer |
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* |
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* @return mixed |
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* |
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* @throws InvalidPointerException |
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*/ |
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public function get($pointer) |
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{ |
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$value = $this->traverse($pointer); |
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if ($value instanceof NonExistentValue) { |
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throw InvalidPointerException::nonexistentValue($value->getValue()); |
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} |
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return $value; |
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} |
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/** |
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* @param string $pointer |
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* |
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* @return bool |
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*/ |
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public function has($pointer) |
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{ |
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return !$this->traverse($pointer) instanceof NonExistentValue; |
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} |
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/** |
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* @param string $pointer |
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* @param mixed $data |
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* |
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* @return void |
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* |
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* @throws InvalidPointerException |
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* @throws \InvalidArgumentException |
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* |
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*/ |
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public function set($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 = $this->parse($pointer); |
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$replace = array_pop($pointer); |
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$target = &$this->getTarget($pointer); |
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if (is_array($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 = $data; |
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} else { |
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throw InvalidPointerException::invalidTarget($target); |
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} |
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} |
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/** |
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* @param string $pointer |
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* |
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* @return void |
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*/ |
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public function remove($pointer) |
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{ |
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if ($pointer === '') { |
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throw new \InvalidArgumentException('Cannot remove the object.'); |
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} |
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$pointer = $this->parse($pointer); |
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$remove = array_pop($pointer); |
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$target = &$this->getTarget($pointer); |
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if (is_array($target)) { |
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unset($target[$remove]); |
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} elseif (is_object($target)) { |
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unset($target->$remove); |
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} else { |
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throw InvalidPointerException::invalidTarget($target); |
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} |
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} |
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/** |
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* @param array $pointer |
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* |
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* @return mixed |
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*/ |
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private function &getTarget(array $pointer) |
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{ |
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$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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return $target; |
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} |
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/** |
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* Returns the value referenced by the pointer or a NonExistentValue if the value does not exist. |
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* |
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* @param string $pointer The pointer |
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* |
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* @return mixed |
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*/ |
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private function traverse($pointer) |
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{ |
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$pointer = $this->parse($pointer); |
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$json = $this->json; |
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foreach ($pointer as $segment) { |
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if ($json instanceof Reference) { |
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if (!$json->has($segment)) { |
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return new NonExistentValue($segment); |
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} |
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$json = $json->get($segment); |
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} elseif (is_object($json)) { |
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// who does this? |
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if ($segment === '' && property_exists($json, '_empty_')) { |
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$segment = '_empty_'; |
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} |
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if (!property_exists($json, $segment)) { |
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return new NonExistentValue($segment); |
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} |
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$json = $json->$segment; |
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} elseif (is_array($json)) { |
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if (!array_key_exists($segment, $json)) { |
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return new NonExistentValue($segment); |
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} |
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$json = $json[$segment]; |
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} else { |
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return new NonExistentValue($segment); |
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} |
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} |
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return $json; |
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} |
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/** |
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* Parses a JSON Pointer as defined in the specification. |
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* @see https://tools.ietf.org/html/rfc6901#section-4 |
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* |
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* @param string $pointer |
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* |
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* @return array |
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* |
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* @throws InvalidPointerException |
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*/ |
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private function parse($pointer) |
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{ |
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if (!is_string($pointer)) { |
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throw InvalidPointerException::invalidType(gettype($pointer)); |
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} |
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if (!isset($pointer[0])) { |
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return []; |
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} |
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// If the pointer is a url fragment, it needs to be url decoded. |
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if ($pointer[0] === '#') { |
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$pointer = urldecode(substr($pointer, 1)); |
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} |
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// For convenience add the beginning slash if it's missing. |
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if (isset($pointer[0]) && $pointer[0] !== '/') { |
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$pointer = '/' . $pointer; |
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} |
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$pointer = array_slice(explode('/', $pointer), 1); |
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return str_replace(['~1', '~0'], ['/', '~'], $pointer); |
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} |
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} |
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thephpleague /
json-reference
