[webkit-dev] Sharing WebKit mocks across platforms

[Satish Sampath]

With a WebCore::LayoutTestController, would there be a need for code in
WebKit to convert the call parameters from WebKit types (which DRT uses) to
WebCore types (which the mocks may use) ? If yes seems like we need wrappers
to proxy the mock calls anyway on different platforms..

Cheers
Satish

On Thu, Jul 29, 2010 at 4:16 PM, Adam Barth <abarth at webkit.org> wrote:

> Thanks for bring this question to the list.  I don't have a strong
> opinion here, but I want to make sure we think project-wide and pick
> something scalable.
>
> This discussion is also related to the discussion about adding
> something like a layoutTestController object to WebCore.  Plumbing
> this mock API all the way through WebKit for each port seems like a
> waste.  If we had something like a WebCore::LayoutTestController, it
> would make a lot more sense to expose that functionality there.
>
> Adam
>
>
> On Wed, Jul 28, 2010 at 11:30 AM, Steve Block <steveblock at google.com>
> wrote:
> > I'm in the process of adding a mock client for DeviceOrientation,
> > which will be used in DumpRenderTree to test the feature. In order to
> > share the mock across platforms, I'd like to add the mock to
> > WebCore/platform/mock.
> >
> > An interface to the mock will have to be exposed to the embedder
> > through the platform's WebKit API, so that it can be configured by
> > DRT, eg ...
> >
> > mWebView.getDeviceOrientationClientMock().setOrientation(...);
> >
> > To avoid each platform having to produce it's own WebKit wrapper for
> > the mock, I'm considering adding a common WebKit wrapper, perhaps to
> > WebKit/common, and I wanted to get some feedback on the idea. The mock
> > would be shared between all C++ WebKit platforms. (Note that this is
> > for convenience only, a platform could equally use it's own WebKit
> > wrapper around the WebCore mock (eg Mac may do so in ObjectiveC), or
> > use its own mock altogether.)
> >
> > Of course we also need WebKit wrappers for all of the non-POD types
> > used by the mock's interface, and these have to be common between all
> > platforms. One obvious potential difficulty is the wrapper for
> > WebCore::String. Each platforms already has a wrapper for this type,
> > but there's no guarantee of interoperability, so we'd need to write a
> > new common interface if we're to use the string type.
> >
> > If a wrapper for string ends up being too problematic, the approach
> > could still be used for mocks that don't need the string type (of
> > which DeviceOrientation is one), but the approach then seems less
> > compelling.
> >
> > Do people think that this is a reasonable proposal and worth pursuing?
> > Has there been any attempt to do anything similar before? Or is any
> > attempt to write this kind of common WebKit code not worth the effort
> > and destined to failure?
> >
> > You can see the work in progress for DeviceOrientation at
> > https://bugs.webkit.org/show_bug.cgi?id=39589 and a similar patch for
> > SpeechInput mocks at https://bugs.webkit.org/show_bug.cgi?id=42603
> >
> > I'd appreciate any feedback you may have.
> >
> > Thanks,
> > Steve
> >
> > --
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>
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