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Date: Wed, 20 Aug 2008 16:46:16 +0200
Reply-To: Marcus Boerger <helly@php.net>
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Message-ID: <1586387787.20080820164616@marcus-boerger.de>
To: Volodymyr Iatsyshyn <viatsyshyn@gmail.com>
CC: internals@lists.php.net
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Subject: Re: [PHP-DEV] Annotations Request
From: helly@php.net (Marcus Boerger)

Hello Volodymyr,

Tuesday, August 19, 2008, 3:54:16 PM, you wrote:

> Hi,

> Is there a chance to have annotations like in Java or like .NET attributes?

> Now, I use Java Annotations emulation, through Reflections and PHPDoc 
> blocks. Example:

> /** Annotation One*/
> class DemoAnnotation1 extends C01t_Annotation
> {
>      public $value;
> }

> /** Annotation Two*/
> class DemoAnnotation2 extends C01t_Annotation
> {
>      public $p1;
>      public $p2;
> }

> class DemoClass
> {
>      const SOME_CONST = 5;

>      /** @DemoAnnotation1(DemoClass::SOME_CONST + 1) */
>      public $property1;

>      /** @DemoAnnotation2(p1 => 1, p2 => 'Hello, Word!') */
>      public $property2;
> }

Basically there is no need for annotations in PHP unlike there is in Python
for instance. However, while the following work:
php -r 'class T { const C=42; var $p=T::C; } var_dump(new T);'
php -r 'class T { const C=42; const D=T::C; } var_dump(new T);
the next two do not:
php -r 'class T { const C=42; var $p=T::C + 1; } var_dump(new T);'
php -r 'class T { const C=42; const D=T::C + 1; } var_dump(new T);

So you might want to have full support for evaluated consts/default values.

The reason why we do not support this right now is a limitation in how
consts and default values get initialised.

Best regards,
 Marcus