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<?php |
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namespace Peridot\Leo\ObjectPath; |
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/** |
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* ObjectPath is a utility for parsing object and array strings into |
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* ObjectPathValues. |
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* |
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* @package Peridot\Leo\Utility |
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*/ |
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class ObjectPath |
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{ |
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/** |
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* The subject to match path expressions against. |
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* |
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* @var array|object |
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*/ |
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protected $subject; |
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/** |
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* A pattern for matching array keys. |
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* |
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* @var string |
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*/ |
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private static $arrayKey = '/\[([^\]]+)\]/'; |
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/** |
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* @param array|object $subject |
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*/ |
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public function __construct($subject) |
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{ |
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$this->subject = $subject; |
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} |
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/** |
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* Returns an ObjectPathValue if the property described by $path |
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* can be located in the subject. |
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* |
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* A path expression uses object and array syntax. |
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* |
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* @code |
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* |
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* $person = new stdClass(); |
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* $person->name = new stdClass(); |
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* $person->name->first = 'brian'; |
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* $person->name->last = 'scaturro'; |
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* $person->hobbies = ['programming', 'reading', 'board games']; |
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* |
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* $path = new ObjectPath($person); |
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* $first = $path->get('name->first'); |
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* $reading = $path->get('hobbies[0]'); |
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* |
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* @endcode |
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* |
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* @param string $path |
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* @return ObjectPathValue |
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*/ |
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public function get($path) |
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{ |
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$parts = $this->getPathParts($path); |
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$properties = $this->getPropertyCollection($this->subject); |
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$pathValue = null; |
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while (!empty($properties) && !empty($parts)) { |
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$key = array_shift($parts); |
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$key = $this->normalizeKey($key); |
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$pathValue = $this->getPathValue($key, $properties); |
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if (!array_key_exists($key, $properties)) { |
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break; |
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} |
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$properties = $this->getPropertyCollection($properties[$key]); |
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} |
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return $pathValue; |
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} |
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/** |
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* Breaks a path expression into an array used |
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* for navigating a path. |
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* |
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* @param $path |
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* @return array |
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*/ |
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public function getPathParts($path) |
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{ |
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$path = preg_replace('/\[/', '->[', $path); |
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if (preg_match('/^->/', $path)) { |
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$path = substr($path, 2); |
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} |
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return explode('->', $path); |
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} |
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/** |
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* Returns a property as an array. |
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* |
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* @param $subject |
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* @return array |
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*/ |
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protected function getPropertyCollection($subject) |
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{ |
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if (is_object($subject)) { |
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return get_object_vars($subject); |
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} |
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return $subject; |
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} |
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/** |
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* Return a key that can be used on the current subject. |
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* |
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* @param $key |
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* @param $matches |
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* @return mixed |
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*/ |
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protected function normalizeKey($key) |
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{ |
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if (preg_match(self::$arrayKey, $key, $matches)) { |
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$key = $matches[1]; |
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return $key; |
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} |
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return $key; |
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} |
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/** |
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* Given a key and a collection of properties, this method |
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* will return an ObjectPathValue if possible. |
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* |
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* @param $key |
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* @param $properties |
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* @return null|ObjectPathValue |
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*/ |
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protected function getPathValue($key, $properties) |
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{ |
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if (!array_key_exists($key, $properties)) { |
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return null; |
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} |
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return new ObjectPathValue($key, $properties[$key]); |
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} |
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} |
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peridot-php /
leo
