[webkit-dev] How to handle Array types in IDL files?

Drew Wilson atwilson at google.com
Wed Aug 26 08:03:38 PDT 2009

To be more precise, the HTML5 IDL defines the following:

typedef sequence<MessagePort> MessagePortArray;

The types above are all MessagePortArray in the spec, not Array. So it seems
like the intent is that they should indeed get mapped to a vanilla JS Array.

I could make these attributes JS-only - that shouldn't be a huge issue since
MessagePorts are currently only enabled for JS anyway (MessagePort is an
empty interface for ObjC). Is that acceptable? Sam?


On Wed, Aug 26, 2009 at 12:34 AM, Cameron McCormack <cam at mcc.id.au> wrote:

> Maciej Stachowiak:
> > We probably need special support for Web IDL array types in the
> > bindings generator. Sam can probably comment n more detail. As a
> > stopgap, we could make the relevant IDL attributes be JS only. I
> > would check out what Web IDL says about Array - I don't think it's
> > supposed to be reflected as just a vanilla JS Array.
> Currently Web IDL says that when getting an attribute of type
> sequence<T>, a new JS Array object is returned.  For array types,
> T[], a host object with particular [[Get]] and [[Put]] behaviour is
> meant to be used, which makes it similar to a native Array.
> Both of these things are pretty speculative, and could do with review.
> --
> Cameron McCormack ≝ http://mcc.id.au/
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