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Date: Mon, 16 Feb 2015 15:40:18 +0300
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To: Benjamin Eberlei <kontakt@beberlei.de>
Cc: Dmitry Stogov <dmitry@zend.com>, PHP Internals <internals@lists.php.net>, 
	Nikita Popov <nikita.ppv@gmail.com>, Guilherme Blanco <guilhermeblanco@gmail.com>, 
	Pierrick CHARRON <pierrick@webstart.fr>, 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=047d7bb03ea887f795050f33e345
Subject: Re: [PHP-DEV] Annotations in PHP7
From: lisachenko.it@gmail.com (Alexander Lisachenko)

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Content-Type: text/plain; charset=UTF-8

2015-02-16 15:31 GMT+03:00 Benjamin Eberlei <kontakt@beberlei.de>:

>
> My question is how do i evaluate this at runtime? I suppose a function is
> necessary like evaluate_ast(...), but  that requires passing the context.
> many many open questions and as nikic points out this should probably be
> delayed to 7.1 because it all should be discussed and specified.
>

This will be like pretty simple to parse:
// For scalars:
$attributes = (new ReflectionMethod(some::class, 'method))->getAttributes();
$cacheableNode = $attributes[Cacheable::class] ?? new
Php\Parser\Node(AST_TYPE_VALUE, 50);
$cacheTime = $cacheableNode->value;

// For more complex things, like expressions or constant, runtime
evaluation can be performed.
$codeNode = $attributes[Php\Contract\Requires::class] ?? new
Php\Parser\Node(AST_TYPE_STATEMENT, '$this->value >=0');
$code = (string) $codeNode;
$result = eval($code);

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