class SimpleAnnotationReader

final class SimpleAnnotationReader {
  protected $ignoredAnnotations = [
    'addtogroup' => TRUE,
    'code' => TRUE,
    'defgroup' => TRUE,
    'deprecated' => TRUE,
    'endcode' => TRUE,
    'endlink' => TRUE,
    'file' => TRUE,
    'ingroup' => TRUE,
    'group' => TRUE,
    'link' => TRUE,
    'mainpage' => TRUE,
    'param' => TRUE,
    'ref' => TRUE,
    'return' => TRUE,
    'section' => TRUE,
    'see' => TRUE,
    'subsection' => TRUE,
    'throws' => TRUE,
    'todo' => TRUE,
    'var' => TRUE,
    '{' => TRUE,
    '}' => TRUE,
  ];
  
  /**
   * @var DocParser
   */
  private $parser;
  
  /**
   * Constructor.
   *
   * Initializes a new SimpleAnnotationReader.
   */
  public function __construct() {
    $this->parser = new DocParser();
    $this->parser
      ->setIgnoreNotImportedAnnotations(true);
    $this->parser
      ->setIgnoredAnnotationNames($this->ignoredAnnotations);
  }
  
  /**
   * Adds a namespace in which we will look for annotations.
   *
   * @param string $namespace
   *
   * @return void
   */
  public function addNamespace($namespace) {
    $this->parser
      ->addNamespace($namespace);
  }
  
  /**
   * Gets the annotations applied to a class.
   *
   * @param ReflectionClass $class The ReflectionClass of the class from which
   * the class annotations should be read.
   *
   * @return array<object> An array of Annotations.
   */
  public function getClassAnnotations(\ReflectionClass $class) {
    return $this->parser
      ->parse($class->getDocComment(), 'class ' . $class->getName());
  }
  
  /**
   * Gets the annotations applied to a method.
   *
   * @param ReflectionMethod $method The ReflectionMethod of the method from which
   * the annotations should be read.
   *
   * @return array<object> An array of Annotations.
   */
  public function getMethodAnnotations(\ReflectionMethod $method) {
    return $this->parser
      ->parse($method->getDocComment(), 'method ' . $method->getDeclaringClass()->name . '::' . $method->getName() . '()');
  }
  
  /**
   * Gets the annotations applied to a property.
   *
   * @param ReflectionProperty $property The ReflectionProperty of the property
   * from which the annotations should be read.
   *
   * @return array<object> An array of Annotations.
   */
  public function getPropertyAnnotations(\ReflectionProperty $property) {
    return $this->parser
      ->parse($property->getDocComment(), 'property ' . $property->getDeclaringClass()->name . '::$' . $property->getName());
  }
  
  /**
   * Gets a class annotation.
   *
   * @param ReflectionClass $class          The ReflectionClass of the class from which
   *          the class annotations should be read.
   * @param class-string<T> $annotationName The name of the annotation.
   *
   * @return T|null The Annotation or NULL, if the requested annotation does not exist.
   *
   * @template T
   */
  public function getClassAnnotation(\ReflectionClass $class, $annotationName) {
    foreach ($this->getClassAnnotations($class) as $annotation) {
      if ($annotation instanceof $annotationName) {
        return $annotation;
      }
    }
    return null;
  }
  
  /**
   * Gets a method annotation.
   *
   * @param ReflectionMethod $method         The ReflectionMethod to read the annotations from.
   * @param class-string<T>  $annotationName The name of the annotation.
   *
   * @return T|null The Annotation or NULL, if the requested annotation does not exist.
   *
   * @template T
   */
  public function getMethodAnnotation(\ReflectionMethod $method, $annotationName) {
    foreach ($this->getMethodAnnotations($method) as $annotation) {
      if ($annotation instanceof $annotationName) {
        return $annotation;
      }
    }
    return null;
  }
  
  /**
   * Gets a property annotation.
   *
   * @param ReflectionProperty $property       The ReflectionProperty to read the annotations from.
   * @param class-string<T>    $annotationName The name of the annotation.
   *
   * @return T|null The Annotation or NULL, if the requested annotation does not exist.
   *
   * @template T
   */
  public function getPropertyAnnotation(\ReflectionProperty $property, $annotationName) {
    foreach ($this->getPropertyAnnotations($property) as $annotation) {
      if ($annotation instanceof $annotationName) {
        return $annotation;
      }
    }
    return null;
  }

}