FatCode Annotations

Introduction

Annotations is an attempt to provide meta data programing for php by extending docblock comments. Syntax is compatible with latest annotations rfc.

Installation

composer install fatcode/annotations

Differences from RFC

The following annotations are not supported for various reasons:

• @Compiled - as there is no compiling
• @SupressWarning - There is no simple way to implement it in user-land
• @Repeatable - all annotations are repeatable by default
• @Inherited - same as @SupressWarning, there is no simple way to track php's inheritance tree in user-land

Built-in annotations

• @Annotation() - makes class available as annotation
• @Required() - ensures that attribute is passed when annotation is used
• @NoValidate() - turns off attribute validation
• @Enum(mixed ...$value) - defines valid values for annotated property
• @Target(string ...$target) - declares valid targets for annotation

Defining an annotation

<?php declare(strict_types=1);

use FatCode\Annotation\Target;
/**
 * @Annotation
 * @Target(Target::TARGET_CLASS)
 */
class MyAnnotation
{
    /**
     * @Required
     * @var string 
     */
    public $name;
}

The above example defines annotation that is only valid for php classes (@Target(Target::TARGET_CLASS)). Annotation will accept attribute name which is required (@Required) and must be of type string

Using annotations

<?php declare(strict_types=1);

/**
 * @MyAnnotation(name="Hello World")
 */
class AnnotatedClass
{
}

The above example makes usage of newly declared MyAnnotation annotation.

Retrieving annotations

Retrieving class annotations

<?php declare(strict_types=1);
use FatCode\Annotation\AnnotationReader;

$reader = new AnnotationReader();
$annotations = $reader->readClassAnnotations(AnnotatedClass::class);
var_dump($annotations);
/* will output:
array(1) {
     [0] =>
     class MyAnnotation#19 (1) {
       public $name =>
       string(11) "Hello World"
     }
   }
*/

Example code can be found here