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Reply-To: =?utf-8?q?Pawe=C5=82_Stradomski?= <pstradomski@gmail.com>
To: internals@lists.php.net,
 Marcus Boerger <helly@php.net>
Date: Wed, 20 Aug 2008 20:38:57 +0200
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Cc: Volodymyr Iatsyshyn <viatsyshyn@gmail.com>
References: <8C.C1.14056.B80DAA84@pb1.pair.com> <1586387787.20080820164616@marcus-boerger.de>
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Message-ID: <200808202038.57642.pstradomski@gmail.com>
Subject: Re: [PHP-DEV] Annotations Request
From: pstradomski@gmail.com (=?utf-8?q?Pawe=C5=82_Stradomski?=)

W li=C5=9Bcie Marcus Boerger z dnia =C5=9Broda, 20 sierpnia 2008:
> Hello Volodymyr,

> Basically there is no need for annotations in PHP unlike there is in Pyth=
on
> for instance. However, while the following work:
> php -r 'class T { const C=3D42; var $p=3DT::C; } var_dump(new T);'
> php -r 'class T { const C=3D42; const D=3DT::C; } var_dump(new T);
> the next two do not:
> php -r 'class T { const C=3D42; var $p=3DT::C + 1; } var_dump(new T);'
> php -r 'class T { const C=3D42; const D=3DT::C + 1; } var_dump(new T);
>
> So you might want to have full support for evaluated consts/default value=
s.

I don't really get your point. Annotations are not about constant values, b=
ut=20
about adding arbitrary attributes to classes and methods/functions.=20

A simple use case (in pseudocode):

class MyController extends BaseController {

   // www.example.com/index
   @allow('any')
   @method('get')
   public function index() {
   }

   // www.example.com/comment
   @allow('any')
   @method('post')
   public function comment() {
   }

   // www.example.com/admin
   @allow('admin')
   @method('get')
   public function admin() {
   }
}

class BaseController {
   public function _execute() {
        $action =3D $this->parseTheUrl();
        $method =3D new ReflectionMethod($this, $action);
        if ($method->annotations('method') !=3D $_SERVER['REQUEST_METHOD'])=
 {
             return $this->methodNotAllowed();
	} elseif (! $this->currentUser->hasPrivilege($method->annotations('allow')=
) {
             return $this->forbidden();
	} else {
             return $this->$action();
        }
   }
}


Python does not need annotations, as functions can have arbitrary attribute=
=20
set:

def a():
   pass

a.x =3D 5

It also has very powerful mechanism of decorators, which are basically=20
higher-order functions applied to functions on their definition, but I don'=
t=20
think Volodymyr asks for so much.=20

=2D-=20
Pawe=C5=82 Stradomski