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Date: Tue, 28 Jun 2016 22:20:00 +0100
To: PHP internals <internals@lists.php.net>
Message-ID: <AD2ADCED-44A5-4583-A492-2D1086258D55@gmail.com>
Subject: Re: [PHP-DEV] [RFC] Simple Annotations
From: rowan.collins@gmail.com (Rowan Collins)

On 28 June 2016 20:10:15 GMT+01:00, Pedro Cordeiro <pedronaroga@gmail.com> wrote:
>> << HttpMethod::post() >> // equivalent to static method-call
>> HttpMethod::post()
>>
>
>What would this, specifically, do? Would it call HttpMethod::post()
>when
>the class gets instantiated and return its return on a
>ReflectionClass::getAnnotations()? Why is it necessary to be able to
>evaluate expressions on annotations?

I'm not sure if it's definitely necessary, but the stated use case was for factories / named constructors. PHP only has one constructor per class, so it's not uncommon to have static createFromX methods.

Since this will eventually evaluate as "new Foo(42)":
<< Foo(42) >>

The idea is that this would be available to call a factory instead:
<< Foo::fromRoman('XLII') >>

The neat thing being that by limiting the options to this, you can still extract a class name for every annotation.

I say "eventually", because as proposed, this won't actually happen until you explicitly ask for the "instance" of the annotation. See previous examples.

Regards,

-- 
Rowan Collins
[IMSoP]