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Date: Mon, 16 Feb 2015 12:49:36 +0100
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To: Dmitry Stogov <dmitry@zend.com>
Cc: PHP Internals <internals@lists.php.net>, Nikita Popov <nikita.ppv@gmail.com>, 
	Guilherme Blanco <guilhermeblanco@gmail.com>, Pierrick CHARRON <pierrick@webstart.fr>, 
	Alexander Lisachenko <lisachenko.it@gmail.com>, Pierre Joye <pierre.php@gmail.com>, 
	Zeev Suraski <zeev@zend.com>, Andi Gutmans <andi@zend.com>, Joe Watkins <pthreads@pthreads.org>, 
	Yasuo Ohgaki <yohgaki@ohgaki.net>, Sebastian Bergmann <sebastian@php.net>, 
	Stanislav Malyshev <smalyshev@gmail.com>, Rasmus Lerdorf <rasmus@lerdorf.com>
Content-Type: multipart/alternative; boundary=047d7bd6adce365096050f332e67
Subject: Re: [PHP-DEV] Annotations in PHP7
From: kontakt@beberlei.de (Benjamin Eberlei)

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On Mon, Feb 16, 2015 at 12:42 PM, Dmitry Stogov <dmitry@zend.com> wrote:

> the idea to not evaluate non-constant expressions at all, but just keep
> AST and provide interface to read it.
> PHP extensions should be able to use them as they like. (evaluate or
> insert into AST of function(s), etc).
>

Ok so this would expose the AST to userland? Because that is not yet done
or? As a userland developer I would prefer having the values evaluated, for
example using the array expresssion syntax in class properties (only
"constants" expressions allowed).

Looking at the PHPT more, there seems to be a typo, requires is used in the
annotation and requres is in the var_dump?

>
> Thanks. Dmitry.
>
> On Mon, Feb 16, 2015 at 2:36 PM, Benjamin Eberlei <kontakt@beberlei.de>
> wrote:
>
>>
>>
>> On Mon, Feb 16, 2015 at 12:07 PM, Dmitry Stogov <dmitry@zend.com> wrote:
>>
>>> hi,
>>>
>>> During discussion of different ways of implementing "Design by Contract"
>>> we
>>> got an idea of using annotations.
>>>
>>> BTW: annotations are useful by their own and may be used for different
>>> purposes. Support for annotations was proposed long time ago:
>>>
>>> https://wiki.php.net/rfc/annotations
>>> https://wiki.php.net/rfc/annotations-in-docblock
>>> https://wiki.php.net/rfc/reflection_doccomment_annotations
>>>
>>> HHVM already implemented similar concept
>>>
>>> http://docs.hhvm.com/manual/en/hack.attributes.php
>>>
>>> I made a quick and dirty PoC that shows how we may implement annotations
>>> in
>>> PHP7 and how powerful they may be :
>>> https://gist.github.com/dstogov/dbf2a8f46e43719bd2c2
>>>
>>> The test there is self explainable. Of course, annotations just provide a
>>> way to add metadata, but doesn't define attribute names or the ways they
>>> are going to be used. Only Reflection API to read.
>>>
>>> There are still a lot of technical problems that have to be solved.
>>> Right now, we just need to answer a question - if we like this in PHP7?
>>> Thought and opinions are welcome...
>>>
>>
>> oh please yes, yes yes :-) I don't care for the syntax, although this
>> looks ok.
>>
>> One question, when does the php expression get evaluated?
>>
>>>
>>> Thanks. Dmitry.
>>>
>>
>>
>

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