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Date: Wed, 18 Feb 2015 08:59:37 +0000 (GMT)
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>
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Subject: Re: [PHP-DEV] Annotations in PHP7
From: derick@php.net (Derick Rethans)

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On Tue, 17 Feb 2015, Dmitry Stogov wrote:

> On Mon, Feb 16, 2015 at 10:57 PM, Derick Rethans <derick@php.net> wrote:
>=20
> > On Mon, 16 Feb 2015, Dmitry Stogov wrote:
> >
> > > hi,
> > >
> > > During discussion of different ways of implementing "Design by Contra=
ct"
> > we
> > > got an idea of using annotations.
> > >
> > > BTW: annotations are useful by their own and may be used for differen=
t
> > > 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 annotati=
ons
> > in
> > > PHP7 and how powerful they may be :
> > > https://gist.github.com/dstogov/dbf2a8f46e43719bd2c2
> >
> > Why didn't you pick the same syntax as hack?
>=20
> It's not smart enough to be used for DbC, AOT and many other features (we
> are going to capture AST).

I realize that, but:

<optimization_level(2)>

could easily look like:

<<optimization_level(2)>>

The latter syntax <<=E2=80=A6>> is what Hack does, but you picked <=E2=80=
=A6> - which=20
makes it both the same as HTML/XML tags *and* different from Hack. The=20
<=E2=80=A6> syntax also gets in the way of XHP=20
(https://github.com/facebookarchive/xhp-php5-extension)

cheers,
Derick
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