1032763 - add an IsPending method to Promise objects

Status: RESOLVED WONTFIX

(Core :: DOM: Core & HTML, defect)

Description

[Cameron McCormack (:heycam)]

Attachment: patch

I want to be able to tell if a Promise is pending (as opposed to resolved/rejected) so I can implement the 'Whenever one or more available font faces for a given FontFaceSet change their status attribute to "loading"' algorithm in http://dev.w3.org/csswg/css-font-loading/#FontFaceSet-events for bug 1028497.

Comment 1

[Boris Zbarsky [:bzbarsky]]

Comment on attachment 8448660 [details] [diff] [review]
patch

I'm not a huge fan of building this on top of what is currently unobservable state.  Does the spec actually require observing internal promise state???

Comment 2

[Cameron McCormack (:heycam)]

As Tab points out in http://lists.w3.org/Archives/Public/www-style/2014Jun/0498.html I can just keep some separate state to know whether I have already called MaybeResolve/MaybeReject on the Promise, so strictly I don't need this IsPending method.  Upon reflection I think this is the way to go.