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Date: Tue, 29 Mar 2016 11:57:07 -0700
Cc: Jesse Schalken <me@jesseschalken.com>,
 Sara Golemon <pollita@php.net>,
 PHP internals <internals@lists.php.net>
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To: Daniel Beardsley <daniel@ifixit.com>
Subject: Re: [PHP-DEV] RFC about automatic template escaping
From: fred@fredemmott.co.uk (Fred Emmott)

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Hi - I=E2=80=99m currently the maintainer of facebook/xhp-lib; as =
XHP=E2=80=99s been mentioned a few times here, if someone=E2=80=99s =
interested in making a PHP7 version:

 - while I won=E2=80=99t be able to directly work on a PHP7 port, I=E2=80=99=
ll be happy to help in any other way (eg any questions about =
design/decisions)
 - the main branch is Hack-only; the PHP-5 compatible stuff is here: =
https://github.com/facebook/xhp-lib/tree/1.x =
<https://github.com/facebook/xhp-lib/tree/1.x> - =
https://github.com/facebookarchive/xhp-php5-extension =
<https://github.com/facebookarchive/xhp-php5-extension>=20
 - the performance of XHP under HHVM is usually not a practical issue; =
it seems likely to be less of an issue under PHP7. A good way to test =
could be to desugar some tests to plain PHP =
(https://github.com/facebookarchive/xhp-php5-extension/blob/master/xhp/xhp=
ize.cpp =
<https://github.com/facebookarchive/xhp-php5-extension/blob/master/xhp/xhp=
ize.cpp> ), then run them under PHP5 and PHP7; this way you can measure =
without having to port the extension first
 - there are workarounds for when it is a real issue, eg =
https://github.com/hhvm/user-documentation/blob/master/src/site/xhp/APCCac=
hedRenderable.php =
<https://github.com/hhvm/user-documentation/blob/master/src/site/xhp/APCCa=
chedRenderable.php> - here, the performance was an insignificant part of =
real requests, but the navigation integration tests were effectively a =
worst-case microbenchmark and test run time is important to us.

While facebook/xhp-lib must remain Hack because of the nature of it=E2=80=99=
s async support, I=E2=80=99d be happy to work with a separate PHP7 =
library to avoid avoid any unnecessary differences - hopefully to the =
point where we could have a shared =E2=80=98provides=E2=80=99 in =
composer. One option would be for the bulk of the files to be transpiled =
(HHVM provides =E2=80=98h2tp=E2=80=99 for this), but have core classes =
like :x:element written separately to strip out Async stuff.

Regards,
 - Fred

> On Mar 20, 2016, at 11:21 PM, Daniel Beardsley <daniel@ifixit.com> =
wrote:
>=20
>> I agree XHP really is the right solution for this problem. It enables =
HTML
>> to be created structurally and composably with a concise inline =
syntax, just
>> like JSX/React does for JavaScript, and just like LINQ does for SQL =
in C#.
>> It's much better than passing around snippets of HTML as strings that =
can
>> easily break.
>=20
> Yeah, XHP is a great way to go, but it's so different from traditional
> templating and is a decent performance penalty that it's hard for =
pre-existing
> large projects to adopt.
>=20
> --=20
> PHP Internals - PHP Runtime Development Mailing List
> To unsubscribe, visit: http://www.php.net/unsub.php
>=20


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