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<?php |
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namespace Swaggest\JsonDiff; |
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class JsonPointer |
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{ |
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/** |
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* @param string $key |
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* @param bool $isURIFragmentId |
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* @return string |
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*/ |
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public static function escapeSegment($key, $isURIFragmentId = false) |
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{ |
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if ($isURIFragmentId) { |
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return str_replace(array('%2F', '%7E'), array('~0', '~1'), urlencode($key)); |
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} else { |
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return str_replace(array('~', '/'), array('~0', '~1'), $key); |
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} |
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} |
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/** |
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* @param string $path |
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* @return string[] |
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* @throws Exception |
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*/ |
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public static function splitPath($path) |
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{ |
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$pathItems = explode('/', $path); |
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$first = array_shift($pathItems); |
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if ($first === '#') { |
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return self::splitPathURIFragment($pathItems); |
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} else { |
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if ($first !== '') { |
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throw new Exception('Path must start with "/": ' . $path); |
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} |
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return self::splitPathJsonString($pathItems); |
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} |
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} |
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private static function splitPathURIFragment(array $pathItems) { |
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$result = array(); |
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foreach ($pathItems as $key) { |
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$key = str_replace(array('~1', '~0'), array('/', '~'), urldecode($key)); |
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$result[] = $key; |
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} |
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return $result; |
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} |
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private static function splitPathJsonString(array $pathItems) { |
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$result = array(); |
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foreach ($pathItems as $key) { |
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$key = str_replace(array('~1', '~0'), array('/', '~'), $key); |
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$result[] = $key; |
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} |
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return $result; |
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} |
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/** |
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* @param mixed $holder |
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* @param string[] $pathItems |
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* @param mixed $value |
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* @param bool $recursively |
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* @throws Exception |
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*/ |
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public static function add(&$holder, $pathItems, $value, $recursively = true) |
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{ |
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$ref = &$holder; |
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while (null !== $key = array_shift($pathItems)) { |
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if ($ref instanceof \stdClass) { |
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if (PHP_VERSION_ID < 71000 && '' === $key) { |
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throw new Exception('Empty property name is not supported by PHP <7.1', |
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Exception::EMPTY_PROPERTY_NAME_UNSUPPORTED); |
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} |
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$ref = &$ref->$key; |
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} else { // null or array |
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$intKey = filter_var($key, FILTER_VALIDATE_INT); |
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if ($ref === null && (false === $intKey || $intKey !== 0)) { |
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$key = (string)$key; |
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if ($recursively) { |
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$ref = new \stdClass(); |
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$ref = &$ref->{$key}; |
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} else { |
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throw new Exception('Non-existent path'); |
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} |
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} else { |
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if ($recursively && $ref === null) $ref = array(); |
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if ('-' === $key) { |
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$ref = &$ref[]; |
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} else { |
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if (is_array($ref) && array_key_exists($key, $ref) && empty($pathItems)) { |
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array_splice($ref, $key, 0, array($value)); |
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} |
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if (false === $intKey) { |
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throw new Exception('Invalid key for array operation'); |
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} |
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if ($intKey > count($ref) && !$recursively) { |
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throw new Exception('Index is greater than number of items in array'); |
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} elseif ($intKey < 0) { |
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throw new Exception('Negative index'); |
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} |
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$ref = &$ref[$intKey]; |
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} |
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} |
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} |
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} |
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$ref = $value; |
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} |
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private static function arrayKeyExists($key, array $a) |
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{ |
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if (array_key_exists($key, $a)) { |
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return true; |
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} |
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$key = (string)$key; |
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foreach ($a as $k => $v) { |
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if ((string)$k === $key) { |
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return true; |
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} |
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} |
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return false; |
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} |
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private static function arrayGet($key, array $a) |
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{ |
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$key = (string)$key; |
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foreach ($a as $k => $v) { |
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if ((string)$k === $key) { |
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return $v; |
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} |
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} |
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return false; |
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} |
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/** |
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* @param mixed $holder |
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* @param string[] $pathItems |
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* @return bool|mixed |
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* @throws Exception |
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*/ |
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public static function get($holder, $pathItems) |
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{ |
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$ref = $holder; |
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while (null !== $key = array_shift($pathItems)) { |
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if ($ref instanceof \stdClass) { |
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if (PHP_VERSION_ID < 71000 && '' === $key) { |
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throw new Exception('Empty property name is not supported by PHP <7.1', |
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Exception::EMPTY_PROPERTY_NAME_UNSUPPORTED); |
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} |
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$vars = (array)$ref; |
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if (self::arrayKeyExists($key, $vars)) { |
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$ref = self::arrayGet($key, $vars); |
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} else { |
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throw new Exception('Key not found: ' . $key); |
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} |
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} elseif (is_array($ref)) { |
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if (self::arrayKeyExists($key, $ref)) { |
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$ref = $ref[$key]; |
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} else { |
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throw new Exception('Key not found: ' . $key); |
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} |
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} else { |
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throw new Exception('Key not found: ' . $key); |
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} |
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} |
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return $ref; |
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} |
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/** |
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* @param mixed $holder |
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* @param string[] $pathItems |
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* @return mixed |
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* @throws Exception |
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*/ |
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public static function remove(&$holder, $pathItems) |
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{ |
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$ref = &$holder; |
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while (null !== $key = array_shift($pathItems)) { |
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$parent = &$ref; |
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$refKey = $key; |
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if ($ref instanceof \stdClass) { |
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if (property_exists($ref, $key)) { |
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$ref = &$ref->$key; |
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} else { |
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throw new Exception('Key not found: ' . $key); |
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} |
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} else { |
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if (array_key_exists($key, $ref)) { |
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$ref = &$ref[$key]; |
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} else { |
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throw new Exception('Key not found: ' . $key); |
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} |
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} |
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} |
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if (isset($parent) && isset($refKey)) { |
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if ($parent instanceof \stdClass) { |
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unset($parent->$refKey); |
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} else { |
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unset($parent[$refKey]); |
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$parent = array_values($parent); |
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} |
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} |
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return $ref; |
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} |
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} |