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Date: Sun, 27 Sep 2020 11:15:28 +0100
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To: internals@lists.php.net
Message-ID: <BF22898F-9AD9-4D5F-9BDE-2166C5585C6F@gmail.com>
Subject: Re: [PHP-DEV] List of attributes
From: rowan.collins@gmail.com (Rowan Tommins)

On 27 September 2020 09:22:48 BST, Nicolas Grekas <nicolas=2Egrekas@gmail=
=2Ecom> wrote:
>The A=2E syntax is consistent with the 1=2E list=2E
>I feel like syntax B is not desired and could be confusing from a
>grammar
>pov=2E
>BUT in syntax 2=2E, we allow an attribute to be unprefixed (bar), so that
>syntax B is consistent with 2=2E


I think it's fairly straightforward to see #[=2E=2E=2E] as meaning "list o=
f attributes", rather than as "change meaning of all identifiers recursivel=
y"=2E So, this will look for a constant "MAGIC", not a nested attribute:

#[Foo(true, 42), Bar(MAGIC)] class X =2E=2E=2E


Nested attributes are a slightly confusing concept anyway, because "normal=
" attributes are always attached to something, but nested attributes occur =
in place of a normal value=2E I can see their usefulness, but having the ex=
tra #[=2E=2E=2E] to say "not a normal value, extra magic happening here" se=
ems sensible=2E


Presumably we could also allow grouping of nested attributes such that thi=
s:

#[Foo(#[Bar, Baz]) class X =2E=2E=2E

Would just be equivalent to this:

#[Foo([ #[Bar], #[Baz] ]) class X =2E=2E=2E

Regards,

--=20
Rowan Tommins
[IMSoP]