Le 01/05/2013 22:26, Kevin Reid a écrit :
In Caja we have several uses for Proxies, some of which involve
reimplementing or modifying the Proxy API.
Out of curiosity, how are you modifying it? for which use case?
We are currently following
the original harmony:proxies (rather than direct or notification
proxies) since that's what is available in browsers.
Firefox implements and shipped direct proxies as part of Firefox 18 [1].
At this occasion, I moved the old proxy design MDN documentation in its
own page [2].
Last I heard, V8 was waiting on the spec to stabilize before moving
forward on implementation [3].
The API on the table for now is direct proxies. Notification proxies are
being discussed but haven't met consensus yet (are there news on this
front, TC39ers?).
If anything, I would recommend to move away from the initial proxy
design for Caja, because the harmony:proxies API is meant to never see
light in the spec (and should probably be removed from Firefox). Among
other things, harmony:proxies would have requires to ~double the memory
to check ES5 invariants regarding non-extensibility and
non-configurability. Direct proxies make the check on the target (and
make the forwarding proxy first-class which enables optimizations that
probably couldn't have been possible in the previous design).
Notification proxies guarantee the invariants by design, but force a
slightly different programming style.
Tom Van Cutsem wrote a direct proxies shim that runs on top of current
browser implementations [4]. If you want to move to direct proxies, it
might be something to consider.
What is the most current test suite available for this variant of proxies? So far I
have found <http://hg.ecmascript.org/tests/harmony/>, which seems to be a more
recent version of what we are currently using, but has it been
superseded by something else?
I have started an unofficial test suite for direct proxies [4][5]. It's
incomplete, but if you want to move to direct proxies, that would be a
good start I guess. Review the tests before fully trusting them, so far
it's been only me working on that.
David
[1]
https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/Proxy
[2] https://developer.mozilla.org/en-US/docs/JavaScript/Old_Proxy_API
[3] http://code.google.com/p/v8/issues/detail?id=1543#c28
[4] https://github.com/tvcutsem/harmony-reflect/blob/master/reflect.js
[5] https://github.com/DavidBruant/ProxyTests
[6] http://davidbruant.github.io/ProxyTests/
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