[webkit-dev] Sharing WebKit mocks across platforms

[Adam Barth]

WebCore::LayoutTestController would be exposed to JavaScript running
in LayoutTests directly (like the DOM), so we can skip the type
conversions.

Adam


On Thu, Jul 29, 2010 at 9:20 AM, Satish Sampath <satish at google.com> wrote:
> 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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>
>