"converting to an ECMAScript value" needs to take a realm, at least sometimes #371

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1. bzbarsky commented on Jun 21, 2017

   

   bzbarsky

   on Jun 21, 2017

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   So for the uses in the IDL spec itself, there is always a current Realm, I believe.

   But I agree, for uses from other specs something needs to happen.
2. TimothyGu commented on Dec 3, 2017

   

   TimothyGu

   on Dec 3, 2017

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   Is there a way to find out which specs call the "convert to an ECMAScript value" algorithm, other than Web IDL itself?
3. bzbarsky commented on Dec 4, 2017

   

   bzbarsky

   on Dec 4, 2017

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   Not trivially.

   You could look for specs that have object or any (or sequences thereof) return values. And specs with Promise<sequence<something>> return values. And so on....

   It's not even trivial to tell from implementations, I suspect. In Gecko promises will automatically pick a global based on various criteria when you resolve them with something...

   That said, a non-exhaustive list (just Promise<sequence<*>> bits, not all of which actually invoke the WebIDL algorithm) is:

   • https://w3c.github.io/ServiceWorker/#clients-getall (rather broken; creates array objects in parallel steps, manipulates array objects in parallel steps; filed matchAll manipulates ES arrays in parallel steps w3c/ServiceWorker#1240).
   • https://w3c.github.io/ServiceWorker/#dom-cache-keys step 5.4.3
   • https://w3c.github.io/ServiceWorker/#dom-cachestorage-keys
   • https://w3c.github.io/ServiceWorker/#cache-matchall -- specifies the realm, nice!
   • getFilesAndDirectories in http://w3c.github.io/filesystem-api/ (not directly linkable?)
   • https://drafts.csswg.org/css-font-loading/#dom-fontfaceset-load
   • https://w3c.github.io/mediacapture-main/getusermedia.html#dom-mediadevices-enumeratedevices
   • WebVR's activeVRDisplays (Can't find a spec draft for this)
   • https://w3c.github.io/ServiceWorker/#navigator-service-worker-getRegistrations (filed getRegistrations manipulates ES arrays in parallel steps w3c/ServiceWorker#1241)
   • https://notifications.spec.whatwg.org/#dom-serviceworkerregistration-getnotifications sort of (filed getNotifications manipulates ES arrays in parallel steps notifications#113)